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sk-rm-partial
neon/pageserver/src/walingest.rs
Heikki Linnakangas 04a682021f Remove the now-unused 'latest' arguments (#7377) 
The 'latest' argument was passed to the functions in
pgdatadir_mapping.rs to know when they can update the relsize
cache. Commit e69ff3fc00 changed how the relsize cache is updated,
making the 'latest' argument unused.
2024-04-25 20:45:37 +03:00

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//!
//! Parse PostgreSQL WAL records and store them in a neon Timeline.
//!
//! The pipeline for ingesting WAL looks like this:
//!
//! WAL receiver -> WalIngest -> Repository
//!
//! The WAL receiver receives a stream of WAL from the WAL safekeepers,
//! and decodes it to individual WAL records. It feeds the WAL records
//! to WalIngest, which parses them and stores them in the Repository.
//!
//! The neon Repository can store page versions in two formats: as
//! page images, or a WAL records. WalIngest::ingest_record() extracts
//! page images out of some WAL records, but most it stores as WAL
//! records. If a WAL record modifies multiple pages, WalIngest
//! will call Repository::put_wal_record or put_page_image functions
//! separately for each modified page.
//!
//! To reconstruct a page using a WAL record, the Repository calls the
//! code in walredo.rs. walredo.rs passes most WAL records to the WAL
//! redo Postgres process, but some records it can handle directly with
//! bespoken Rust code.
use pageserver_api::shard::ShardIdentity;
use postgres_ffi::v14::nonrelfile_utils::clogpage_precedes;
use postgres_ffi::v14::nonrelfile_utils::slru_may_delete_clogsegment;
use postgres_ffi::{fsm_logical_to_physical, page_is_new, page_set_lsn};
use anyhow::{bail, Context, Result};
use bytes::{Buf, Bytes, BytesMut};
use tracing::*;
use utils::failpoint_support;
use crate::context::RequestContext;
use crate::metrics::WAL_INGEST;
use crate::pgdatadir_mapping::{DatadirModification, Version};
use crate::tenant::PageReconstructError;
use crate::tenant::Timeline;
use crate::walrecord::*;
use crate::ZERO_PAGE;
use pageserver_api::key::rel_block_to_key;
use pageserver_api::reltag::{BlockNumber, RelTag, SlruKind};
use postgres_ffi::pg_constants;
use postgres_ffi::relfile_utils::{FSM_FORKNUM, INIT_FORKNUM, MAIN_FORKNUM, VISIBILITYMAP_FORKNUM};
use postgres_ffi::v14::nonrelfile_utils::mx_offset_to_member_segment;
use postgres_ffi::v14::xlog_utils::*;
use postgres_ffi::v14::CheckPoint;
use postgres_ffi::TransactionId;
use postgres_ffi::BLCKSZ;
use utils::lsn::Lsn;
pub struct WalIngest {
shard: ShardIdentity,
checkpoint: CheckPoint,
checkpoint_modified: bool,
}
impl WalIngest {
pub async fn new(
timeline: &Timeline,
startpoint: Lsn,
ctx: &RequestContext,
) -> anyhow::Result<WalIngest> {
// Fetch the latest checkpoint into memory, so that we can compare with it
// quickly in `ingest_record` and update it when it changes.
let checkpoint_bytes = timeline.get_checkpoint(startpoint, ctx).await?;
let checkpoint = CheckPoint::decode(&checkpoint_bytes)?;
trace!("CheckPoint.nextXid = {}", checkpoint.nextXid.value);
Ok(WalIngest {
shard: *timeline.get_shard_identity(),
checkpoint,
checkpoint_modified: false,
})
}
///
/// Decode a PostgreSQL WAL record and store it in the repository, in the given timeline.
///
/// This function updates `lsn` field of `DatadirModification`
///
/// Helper function to parse a WAL record and call the Timeline's PUT functions for all the
/// relations/pages that the record affects.
///
/// This function returns `true` if the record was ingested, and `false` if it was filtered out
///
pub async fn ingest_record(
&mut self,
recdata: Bytes,
lsn: Lsn,
modification: &mut DatadirModification<'_>,
decoded: &mut DecodedWALRecord,
ctx: &RequestContext,
) -> anyhow::Result<bool> {
WAL_INGEST.records_received.inc();
let pg_version = modification.tline.pg_version;
let prev_len = modification.len();
modification.set_lsn(lsn)?;
decode_wal_record(recdata, decoded, pg_version)?;
let mut buf = decoded.record.clone();
buf.advance(decoded.main_data_offset);
assert!(!self.checkpoint_modified);
if decoded.xl_xid != pg_constants::INVALID_TRANSACTION_ID
&& self.checkpoint.update_next_xid(decoded.xl_xid)
{
self.checkpoint_modified = true;
}
failpoint_support::sleep_millis_async!("wal-ingest-record-sleep");
match decoded.xl_rmid {
pg_constants::RM_HEAP_ID | pg_constants::RM_HEAP2_ID => {
// Heap AM records need some special handling, because they modify VM pages
// without registering them with the standard mechanism.
self.ingest_heapam_record(&mut buf, modification, decoded, ctx)
.await?;
}
pg_constants::RM_NEON_ID => {
self.ingest_neonrmgr_record(&mut buf, modification, decoded, ctx)
.await?;
}
// Handle other special record types
pg_constants::RM_SMGR_ID => {
let info = decoded.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
if info == pg_constants::XLOG_SMGR_CREATE {
let create = XlSmgrCreate::decode(&mut buf);
self.ingest_xlog_smgr_create(modification, &create, ctx)
.await?;
} else if info == pg_constants::XLOG_SMGR_TRUNCATE {
let truncate = XlSmgrTruncate::decode(&mut buf);
self.ingest_xlog_smgr_truncate(modification, &truncate, ctx)
.await?;
}
}
pg_constants::RM_DBASE_ID => {
let info = decoded.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
debug!(%info, %pg_version, "handle RM_DBASE_ID");
if pg_version == 14 {
if info == postgres_ffi::v14::bindings::XLOG_DBASE_CREATE {
let createdb = XlCreateDatabase::decode(&mut buf);
debug!("XLOG_DBASE_CREATE v14");
self.ingest_xlog_dbase_create(modification, &createdb, ctx)
.await?;
} else if info == postgres_ffi::v14::bindings::XLOG_DBASE_DROP {
let dropdb = XlDropDatabase::decode(&mut buf);
for tablespace_id in dropdb.tablespace_ids {
trace!("Drop db {}, {}", tablespace_id, dropdb.db_id);
modification
.drop_dbdir(tablespace_id, dropdb.db_id, ctx)
.await?;
}
}
} else if pg_version == 15 {
if info == postgres_ffi::v15::bindings::XLOG_DBASE_CREATE_WAL_LOG {
debug!("XLOG_DBASE_CREATE_WAL_LOG: noop");
} else if info == postgres_ffi::v15::bindings::XLOG_DBASE_CREATE_FILE_COPY {
// The XLOG record was renamed between v14 and v15,
// but the record format is the same.
// So we can reuse XlCreateDatabase here.
debug!("XLOG_DBASE_CREATE_FILE_COPY");
let createdb = XlCreateDatabase::decode(&mut buf);
self.ingest_xlog_dbase_create(modification, &createdb, ctx)
.await?;
} else if info == postgres_ffi::v15::bindings::XLOG_DBASE_DROP {
let dropdb = XlDropDatabase::decode(&mut buf);
for tablespace_id in dropdb.tablespace_ids {
trace!("Drop db {}, {}", tablespace_id, dropdb.db_id);
modification
.drop_dbdir(tablespace_id, dropdb.db_id, ctx)
.await?;
}
}
} else if pg_version == 16 {
if info == postgres_ffi::v16::bindings::XLOG_DBASE_CREATE_WAL_LOG {
debug!("XLOG_DBASE_CREATE_WAL_LOG: noop");
} else if info == postgres_ffi::v16::bindings::XLOG_DBASE_CREATE_FILE_COPY {
// The XLOG record was renamed between v14 and v15,
// but the record format is the same.
// So we can reuse XlCreateDatabase here.
debug!("XLOG_DBASE_CREATE_FILE_COPY");
let createdb = XlCreateDatabase::decode(&mut buf);
self.ingest_xlog_dbase_create(modification, &createdb, ctx)
.await?;
} else if info == postgres_ffi::v16::bindings::XLOG_DBASE_DROP {
let dropdb = XlDropDatabase::decode(&mut buf);
for tablespace_id in dropdb.tablespace_ids {
trace!("Drop db {}, {}", tablespace_id, dropdb.db_id);
modification
.drop_dbdir(tablespace_id, dropdb.db_id, ctx)
.await?;
}
}
}
}
pg_constants::RM_TBLSPC_ID => {
trace!("XLOG_TBLSPC_CREATE/DROP is not handled yet");
}
pg_constants::RM_CLOG_ID => {
let info = decoded.xl_info & !pg_constants::XLR_INFO_MASK;
if info == pg_constants::CLOG_ZEROPAGE {
let pageno = buf.get_u32_le();
let segno = pageno / pg_constants::SLRU_PAGES_PER_SEGMENT;
let rpageno = pageno % pg_constants::SLRU_PAGES_PER_SEGMENT;
self.put_slru_page_image(
modification,
SlruKind::Clog,
segno,
rpageno,
ZERO_PAGE.clone(),
ctx,
)
.await?;
} else {
assert!(info == pg_constants::CLOG_TRUNCATE);
let xlrec = XlClogTruncate::decode(&mut buf);
self.ingest_clog_truncate_record(modification, &xlrec, ctx)
.await?;
}
}
pg_constants::RM_XACT_ID => {
let info = decoded.xl_info & pg_constants::XLOG_XACT_OPMASK;
if info == pg_constants::XLOG_XACT_COMMIT || info == pg_constants::XLOG_XACT_ABORT {
let parsed_xact =
XlXactParsedRecord::decode(&mut buf, decoded.xl_xid, decoded.xl_info);
self.ingest_xact_record(
modification,
&parsed_xact,
info == pg_constants::XLOG_XACT_COMMIT,
ctx,
)
.await?;
} else if info == pg_constants::XLOG_XACT_COMMIT_PREPARED
|| info == pg_constants::XLOG_XACT_ABORT_PREPARED
{
let parsed_xact =
XlXactParsedRecord::decode(&mut buf, decoded.xl_xid, decoded.xl_info);
self.ingest_xact_record(
modification,
&parsed_xact,
info == pg_constants::XLOG_XACT_COMMIT_PREPARED,
ctx,
)
.await?;
// Remove twophase file. see RemoveTwoPhaseFile() in postgres code
trace!(
"Drop twophaseFile for xid {} parsed_xact.xid {} here at {}",
decoded.xl_xid,
parsed_xact.xid,
lsn,
);
modification
.drop_twophase_file(parsed_xact.xid, ctx)
.await?;
} else if info == pg_constants::XLOG_XACT_PREPARE {
modification
.put_twophase_file(decoded.xl_xid, Bytes::copy_from_slice(&buf[..]), ctx)
.await?;
}
}
pg_constants::RM_MULTIXACT_ID => {
let info = decoded.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
if info == pg_constants::XLOG_MULTIXACT_ZERO_OFF_PAGE {
let pageno = buf.get_u32_le();
let segno = pageno / pg_constants::SLRU_PAGES_PER_SEGMENT;
let rpageno = pageno % pg_constants::SLRU_PAGES_PER_SEGMENT;
self.put_slru_page_image(
modification,
SlruKind::MultiXactOffsets,
segno,
rpageno,
ZERO_PAGE.clone(),
ctx,
)
.await?;
} else if info == pg_constants::XLOG_MULTIXACT_ZERO_MEM_PAGE {
let pageno = buf.get_u32_le();
let segno = pageno / pg_constants::SLRU_PAGES_PER_SEGMENT;
let rpageno = pageno % pg_constants::SLRU_PAGES_PER_SEGMENT;
self.put_slru_page_image(
modification,
SlruKind::MultiXactMembers,
segno,
rpageno,
ZERO_PAGE.clone(),
ctx,
)
.await?;
} else if info == pg_constants::XLOG_MULTIXACT_CREATE_ID {
let xlrec = XlMultiXactCreate::decode(&mut buf);
self.ingest_multixact_create_record(modification, &xlrec)?;
} else if info == pg_constants::XLOG_MULTIXACT_TRUNCATE_ID {
let xlrec = XlMultiXactTruncate::decode(&mut buf);
self.ingest_multixact_truncate_record(modification, &xlrec, ctx)
.await?;
}
}
pg_constants::RM_RELMAP_ID => {
let xlrec = XlRelmapUpdate::decode(&mut buf);
self.ingest_relmap_page(modification, &xlrec, decoded, ctx)
.await?;
}
pg_constants::RM_XLOG_ID => {
let info = decoded.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
if info == pg_constants::XLOG_NEXTOID {
let next_oid = buf.get_u32_le();
if self.checkpoint.nextOid != next_oid {
self.checkpoint.nextOid = next_oid;
self.checkpoint_modified = true;
}
} else if info == pg_constants::XLOG_CHECKPOINT_ONLINE
|| info == pg_constants::XLOG_CHECKPOINT_SHUTDOWN
{
let mut checkpoint_bytes = [0u8; SIZEOF_CHECKPOINT];
buf.copy_to_slice(&mut checkpoint_bytes);
let xlog_checkpoint = CheckPoint::decode(&checkpoint_bytes)?;
trace!(
"xlog_checkpoint.oldestXid={}, checkpoint.oldestXid={}",
xlog_checkpoint.oldestXid,
self.checkpoint.oldestXid
);
if (self
.checkpoint
.oldestXid
.wrapping_sub(xlog_checkpoint.oldestXid) as i32)
< 0
{
self.checkpoint.oldestXid = xlog_checkpoint.oldestXid;
}
trace!(
"xlog_checkpoint.oldestActiveXid={}, checkpoint.oldestActiveXid={}",
xlog_checkpoint.oldestActiveXid,
self.checkpoint.oldestActiveXid
);
self.checkpoint.oldestActiveXid = xlog_checkpoint.oldestActiveXid;
// Write a new checkpoint key-value pair on every checkpoint record, even
// if nothing really changed. Not strictly required, but it seems nice to
// have some trace of the checkpoint records in the layer files at the same
// LSNs.
self.checkpoint_modified = true;
}
}
pg_constants::RM_LOGICALMSG_ID => {
let info = decoded.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
if info == pg_constants::XLOG_LOGICAL_MESSAGE {
let xlrec = crate::walrecord::XlLogicalMessage::decode(&mut buf);
let prefix = std::str::from_utf8(&buf[0..xlrec.prefix_size - 1])?;
let message = &buf[xlrec.prefix_size..xlrec.prefix_size + xlrec.message_size];
if prefix == "neon-test" {
// This is a convenient way to make the WAL ingestion pause at
// particular point in the WAL. For more fine-grained control,
// we could peek into the message and only pause if it contains
// a particular string, for example, but this is enough for now.
failpoint_support::sleep_millis_async!("wal-ingest-logical-message-sleep");
} else if let Some(path) = prefix.strip_prefix("neon-file:") {
modification.put_file(path, message, ctx).await?;
}
}
}
pg_constants::RM_STANDBY_ID => {
let info = decoded.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
if info == pg_constants::XLOG_RUNNING_XACTS {
let xlrec = crate::walrecord::XlRunningXacts::decode(&mut buf);
self.checkpoint.oldestActiveXid = xlrec.oldest_running_xid;
}
}
_x => {
// TODO: should probably log & fail here instead of blindly
// doing something without understanding the protocol
}
}
// Iterate through all the blocks that the record modifies, and
// "put" a separate copy of the record for each block.
for blk in decoded.blocks.iter() {
let rel = RelTag {
spcnode: blk.rnode_spcnode,
dbnode: blk.rnode_dbnode,
relnode: blk.rnode_relnode,
forknum: blk.forknum,
};
let key = rel_block_to_key(rel, blk.blkno);
let key_is_local = self.shard.is_key_local(&key);
tracing::debug!(
lsn=%lsn,
key=%key,
"ingest: shard decision {} (checkpoint={})",
if !key_is_local { "drop" } else { "keep" },
self.checkpoint_modified
);
if !key_is_local {
if self.shard.is_shard_zero() {
// Shard 0 tracks relation sizes. Although we will not store this block, we will observe
// its blkno in case it implicitly extends a relation.
self.observe_decoded_block(modification, blk, ctx).await?;
}
continue;
}
self.ingest_decoded_block(modification, lsn, decoded, blk, ctx)
.await?;
}
// If checkpoint data was updated, store the new version in the repository
if self.checkpoint_modified {
let new_checkpoint_bytes = self.checkpoint.encode()?;
modification.put_checkpoint(new_checkpoint_bytes)?;
self.checkpoint_modified = false;
}
// Note that at this point this record is only cached in the modification
// until commit() is called to flush the data into the repository and update
// the latest LSN.
Ok(modification.len() > prev_len)
}
/// Do not store this block, but observe it for the purposes of updating our relation size state.
async fn observe_decoded_block(
&mut self,
modification: &mut DatadirModification<'_>,
blk: &DecodedBkpBlock,
ctx: &RequestContext,
) -> Result<(), PageReconstructError> {
let rel = RelTag {
spcnode: blk.rnode_spcnode,
dbnode: blk.rnode_dbnode,
relnode: blk.rnode_relnode,
forknum: blk.forknum,
};
self.handle_rel_extend(modification, rel, blk.blkno, ctx)
.await
}
async fn ingest_decoded_block(
&mut self,
modification: &mut DatadirModification<'_>,
lsn: Lsn,
decoded: &DecodedWALRecord,
blk: &DecodedBkpBlock,
ctx: &RequestContext,
) -> Result<(), PageReconstructError> {
let rel = RelTag {
spcnode: blk.rnode_spcnode,
dbnode: blk.rnode_dbnode,
relnode: blk.rnode_relnode,
forknum: blk.forknum,
};
//
// Instead of storing full-page-image WAL record,
// it is better to store extracted image: we can skip wal-redo
// in this case. Also some FPI records may contain multiple (up to 32) pages,
// so them have to be copied multiple times.
//
if blk.apply_image
&& blk.has_image
&& decoded.xl_rmid == pg_constants::RM_XLOG_ID
&& (decoded.xl_info == pg_constants::XLOG_FPI
|| decoded.xl_info == pg_constants::XLOG_FPI_FOR_HINT)
// compression of WAL is not yet supported: fall back to storing the original WAL record
&& !postgres_ffi::bkpimage_is_compressed(blk.bimg_info, modification.tline.pg_version)?
// do not materialize null pages because them most likely be soon replaced with real data
&& blk.bimg_len != 0
{
// Extract page image from FPI record
let img_len = blk.bimg_len as usize;
let img_offs = blk.bimg_offset as usize;
let mut image = BytesMut::with_capacity(BLCKSZ as usize);
image.extend_from_slice(&decoded.record[img_offs..img_offs + img_len]);
if blk.hole_length != 0 {
let tail = image.split_off(blk.hole_offset as usize);
image.resize(image.len() + blk.hole_length as usize, 0u8);
image.unsplit(tail);
}
//
// Match the logic of XLogReadBufferForRedoExtended:
// The page may be uninitialized. If so, we can't set the LSN because
// that would corrupt the page.
//
if !page_is_new(&image) {
page_set_lsn(&mut image, lsn)
}
assert_eq!(image.len(), BLCKSZ as usize);
self.put_rel_page_image(modification, rel, blk.blkno, image.freeze(), ctx)
.await?;
} else {
let rec = NeonWalRecord::Postgres {
will_init: blk.will_init || blk.apply_image,
rec: decoded.record.clone(),
};
self.put_rel_wal_record(modification, rel, blk.blkno, rec, ctx)
.await?;
}
Ok(())
}
async fn ingest_heapam_record(
&mut self,
buf: &mut Bytes,
modification: &mut DatadirModification<'_>,
decoded: &DecodedWALRecord,
ctx: &RequestContext,
) -> anyhow::Result<()> {
// Handle VM bit updates that are implicitly part of heap records.
// First, look at the record to determine which VM bits need
// to be cleared. If either of these variables is set, we
// need to clear the corresponding bits in the visibility map.
let mut new_heap_blkno: Option<u32> = None;
let mut old_heap_blkno: Option<u32> = None;
let mut flags = pg_constants::VISIBILITYMAP_VALID_BITS;
match modification.tline.pg_version {
14 => {
if decoded.xl_rmid == pg_constants::RM_HEAP_ID {
let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
if info == pg_constants::XLOG_HEAP_INSERT {
let xlrec = v14::XlHeapInsert::decode(buf);
assert_eq!(0, buf.remaining());
if (xlrec.flags & pg_constants::XLH_INSERT_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_DELETE {
let xlrec = v14::XlHeapDelete::decode(buf);
if (xlrec.flags & pg_constants::XLH_DELETE_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_UPDATE
|| info == pg_constants::XLOG_HEAP_HOT_UPDATE
{
let xlrec = v14::XlHeapUpdate::decode(buf);
// the size of tuple data is inferred from the size of the record.
// we can't validate the remaining number of bytes without parsing
// the tuple data.
if (xlrec.flags & pg_constants::XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks.last().unwrap().blkno);
}
if (xlrec.flags & pg_constants::XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED) != 0 {
// PostgreSQL only uses XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED on a
// non-HOT update where the new tuple goes to different page than
// the old one. Otherwise, only XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED is
// set.
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_LOCK {
let xlrec = v14::XlHeapLock::decode(buf);
if (xlrec.flags & pg_constants::XLH_LOCK_ALL_FROZEN_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks[0].blkno);
flags = pg_constants::VISIBILITYMAP_ALL_FROZEN;
}
}
} else if decoded.xl_rmid == pg_constants::RM_HEAP2_ID {
let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
if info == pg_constants::XLOG_HEAP2_MULTI_INSERT {
let xlrec = v14::XlHeapMultiInsert::decode(buf);
let offset_array_len =
if decoded.xl_info & pg_constants::XLOG_HEAP_INIT_PAGE > 0 {
// the offsets array is omitted if XLOG_HEAP_INIT_PAGE is set
0
} else {
std::mem::size_of::<u16>() * xlrec.ntuples as usize
};
assert_eq!(offset_array_len, buf.remaining());
if (xlrec.flags & pg_constants::XLH_INSERT_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP2_LOCK_UPDATED {
let xlrec = v14::XlHeapLockUpdated::decode(buf);
if (xlrec.flags & pg_constants::XLH_LOCK_ALL_FROZEN_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks[0].blkno);
flags = pg_constants::VISIBILITYMAP_ALL_FROZEN;
}
}
} else {
bail!("Unknown RMGR {} for Heap decoding", decoded.xl_rmid);
}
}
15 => {
if decoded.xl_rmid == pg_constants::RM_HEAP_ID {
let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
if info == pg_constants::XLOG_HEAP_INSERT {
let xlrec = v15::XlHeapInsert::decode(buf);
assert_eq!(0, buf.remaining());
if (xlrec.flags & pg_constants::XLH_INSERT_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_DELETE {
let xlrec = v15::XlHeapDelete::decode(buf);
if (xlrec.flags & pg_constants::XLH_DELETE_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_UPDATE
|| info == pg_constants::XLOG_HEAP_HOT_UPDATE
{
let xlrec = v15::XlHeapUpdate::decode(buf);
// the size of tuple data is inferred from the size of the record.
// we can't validate the remaining number of bytes without parsing
// the tuple data.
if (xlrec.flags & pg_constants::XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks.last().unwrap().blkno);
}
if (xlrec.flags & pg_constants::XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED) != 0 {
// PostgreSQL only uses XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED on a
// non-HOT update where the new tuple goes to different page than
// the old one. Otherwise, only XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED is
// set.
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_LOCK {
let xlrec = v15::XlHeapLock::decode(buf);
if (xlrec.flags & pg_constants::XLH_LOCK_ALL_FROZEN_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks[0].blkno);
flags = pg_constants::VISIBILITYMAP_ALL_FROZEN;
}
}
} else if decoded.xl_rmid == pg_constants::RM_HEAP2_ID {
let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
if info == pg_constants::XLOG_HEAP2_MULTI_INSERT {
let xlrec = v15::XlHeapMultiInsert::decode(buf);
let offset_array_len =
if decoded.xl_info & pg_constants::XLOG_HEAP_INIT_PAGE > 0 {
// the offsets array is omitted if XLOG_HEAP_INIT_PAGE is set
0
} else {
std::mem::size_of::<u16>() * xlrec.ntuples as usize
};
assert_eq!(offset_array_len, buf.remaining());
if (xlrec.flags & pg_constants::XLH_INSERT_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP2_LOCK_UPDATED {
let xlrec = v15::XlHeapLockUpdated::decode(buf);
if (xlrec.flags & pg_constants::XLH_LOCK_ALL_FROZEN_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks[0].blkno);
flags = pg_constants::VISIBILITYMAP_ALL_FROZEN;
}
}
} else {
bail!("Unknown RMGR {} for Heap decoding", decoded.xl_rmid);
}
}
16 => {
if decoded.xl_rmid == pg_constants::RM_HEAP_ID {
let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
if info == pg_constants::XLOG_HEAP_INSERT {
let xlrec = v16::XlHeapInsert::decode(buf);
assert_eq!(0, buf.remaining());
if (xlrec.flags & pg_constants::XLH_INSERT_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_DELETE {
let xlrec = v16::XlHeapDelete::decode(buf);
if (xlrec.flags & pg_constants::XLH_DELETE_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_UPDATE
|| info == pg_constants::XLOG_HEAP_HOT_UPDATE
{
let xlrec = v16::XlHeapUpdate::decode(buf);
// the size of tuple data is inferred from the size of the record.
// we can't validate the remaining number of bytes without parsing
// the tuple data.
if (xlrec.flags & pg_constants::XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks.last().unwrap().blkno);
}
if (xlrec.flags & pg_constants::XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED) != 0 {
// PostgreSQL only uses XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED on a
// non-HOT update where the new tuple goes to different page than
// the old one. Otherwise, only XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED is
// set.
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP_LOCK {
let xlrec = v16::XlHeapLock::decode(buf);
if (xlrec.flags & pg_constants::XLH_LOCK_ALL_FROZEN_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks[0].blkno);
flags = pg_constants::VISIBILITYMAP_ALL_FROZEN;
}
}
} else if decoded.xl_rmid == pg_constants::RM_HEAP2_ID {
let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
if info == pg_constants::XLOG_HEAP2_MULTI_INSERT {
let xlrec = v16::XlHeapMultiInsert::decode(buf);
let offset_array_len =
if decoded.xl_info & pg_constants::XLOG_HEAP_INIT_PAGE > 0 {
// the offsets array is omitted if XLOG_HEAP_INIT_PAGE is set
0
} else {
std::mem::size_of::<u16>() * xlrec.ntuples as usize
};
assert_eq!(offset_array_len, buf.remaining());
if (xlrec.flags & pg_constants::XLH_INSERT_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
} else if info == pg_constants::XLOG_HEAP2_LOCK_UPDATED {
let xlrec = v16::XlHeapLockUpdated::decode(buf);
if (xlrec.flags & pg_constants::XLH_LOCK_ALL_FROZEN_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks[0].blkno);
flags = pg_constants::VISIBILITYMAP_ALL_FROZEN;
}
}
} else {
bail!("Unknown RMGR {} for Heap decoding", decoded.xl_rmid);
}
}
_ => {}
}
// Clear the VM bits if required.
if new_heap_blkno.is_some() || old_heap_blkno.is_some() {
let vm_rel = RelTag {
forknum: VISIBILITYMAP_FORKNUM,
spcnode: decoded.blocks[0].rnode_spcnode,
dbnode: decoded.blocks[0].rnode_dbnode,
relnode: decoded.blocks[0].rnode_relnode,
};
let mut new_vm_blk = new_heap_blkno.map(pg_constants::HEAPBLK_TO_MAPBLOCK);
let mut old_vm_blk = old_heap_blkno.map(pg_constants::HEAPBLK_TO_MAPBLOCK);
// Sometimes, Postgres seems to create heap WAL records with the
// ALL_VISIBLE_CLEARED flag set, even though the bit in the VM page is
// not set. In fact, it's possible that the VM page does not exist at all.
// In that case, we don't want to store a record to clear the VM bit;
// replaying it would fail to find the previous image of the page, because
// it doesn't exist. So check if the VM page(s) exist, and skip the WAL
// record if it doesn't.
let vm_size = get_relsize(modification, vm_rel, ctx).await?;
if let Some(blknum) = new_vm_blk {
if blknum >= vm_size {
new_vm_blk = None;
}
}
if let Some(blknum) = old_vm_blk {
if blknum >= vm_size {
old_vm_blk = None;
}
}
if new_vm_blk.is_some() || old_vm_blk.is_some() {
if new_vm_blk == old_vm_blk {
// An UPDATE record that needs to clear the bits for both old and the
// new page, both of which reside on the same VM page.
self.put_rel_wal_record(
modification,
vm_rel,
new_vm_blk.unwrap(),
NeonWalRecord::ClearVisibilityMapFlags {
new_heap_blkno,
old_heap_blkno,
flags,
},
ctx,
)
.await?;
} else {
// Clear VM bits for one heap page, or for two pages that reside on
// different VM pages.
if let Some(new_vm_blk) = new_vm_blk {
self.put_rel_wal_record(
modification,
vm_rel,
new_vm_blk,
NeonWalRecord::ClearVisibilityMapFlags {
new_heap_blkno,
old_heap_blkno: None,
flags,
},
ctx,
)
.await?;
}
if let Some(old_vm_blk) = old_vm_blk {
self.put_rel_wal_record(
modification,
vm_rel,
old_vm_blk,
NeonWalRecord::ClearVisibilityMapFlags {
new_heap_blkno: None,
old_heap_blkno,
flags,
},
ctx,
)
.await?;
}
}
}
}
Ok(())
}
async fn ingest_neonrmgr_record(
&mut self,
buf: &mut Bytes,
modification: &mut DatadirModification<'_>,
decoded: &DecodedWALRecord,
ctx: &RequestContext,
) -> anyhow::Result<()> {
// Handle VM bit updates that are implicitly part of heap records.
// First, look at the record to determine which VM bits need
// to be cleared. If either of these variables is set, we
// need to clear the corresponding bits in the visibility map.
let mut new_heap_blkno: Option<u32> = None;
let mut old_heap_blkno: Option<u32> = None;
let mut flags = pg_constants::VISIBILITYMAP_VALID_BITS;
let pg_version = modification.tline.pg_version;
assert_eq!(decoded.xl_rmid, pg_constants::RM_NEON_ID);
match pg_version {
16 => {
let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
match info {
pg_constants::XLOG_NEON_HEAP_INSERT => {
let xlrec = v16::rm_neon::XlNeonHeapInsert::decode(buf);
assert_eq!(0, buf.remaining());
if (xlrec.flags & pg_constants::XLH_INSERT_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
}
pg_constants::XLOG_NEON_HEAP_DELETE => {
let xlrec = v16::rm_neon::XlNeonHeapDelete::decode(buf);
if (xlrec.flags & pg_constants::XLH_DELETE_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
}
pg_constants::XLOG_NEON_HEAP_UPDATE
| pg_constants::XLOG_NEON_HEAP_HOT_UPDATE => {
let xlrec = v16::rm_neon::XlNeonHeapUpdate::decode(buf);
// the size of tuple data is inferred from the size of the record.
// we can't validate the remaining number of bytes without parsing
// the tuple data.
if (xlrec.flags & pg_constants::XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks.last().unwrap().blkno);
}
if (xlrec.flags & pg_constants::XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED) != 0 {
// PostgreSQL only uses XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED on a
// non-HOT update where the new tuple goes to different page than
// the old one. Otherwise, only XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED is
// set.
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
}
pg_constants::XLOG_NEON_HEAP_MULTI_INSERT => {
let xlrec = v16::rm_neon::XlNeonHeapMultiInsert::decode(buf);
let offset_array_len =
if decoded.xl_info & pg_constants::XLOG_HEAP_INIT_PAGE > 0 {
// the offsets array is omitted if XLOG_HEAP_INIT_PAGE is set
0
} else {
std::mem::size_of::<u16>() * xlrec.ntuples as usize
};
assert_eq!(offset_array_len, buf.remaining());
if (xlrec.flags & pg_constants::XLH_INSERT_ALL_VISIBLE_CLEARED) != 0 {
new_heap_blkno = Some(decoded.blocks[0].blkno);
}
}
pg_constants::XLOG_NEON_HEAP_LOCK => {
let xlrec = v16::rm_neon::XlNeonHeapLock::decode(buf);
if (xlrec.flags & pg_constants::XLH_LOCK_ALL_FROZEN_CLEARED) != 0 {
old_heap_blkno = Some(decoded.blocks[0].blkno);
flags = pg_constants::VISIBILITYMAP_ALL_FROZEN;
}
}
info => bail!("Unknown WAL record type for Neon RMGR: {}", info),
}
}
_ => bail!(
"Neon RMGR has no known compatibility with PostgreSQL version {}",
pg_version
),
}
// Clear the VM bits if required.
if new_heap_blkno.is_some() || old_heap_blkno.is_some() {
let vm_rel = RelTag {
forknum: VISIBILITYMAP_FORKNUM,
spcnode: decoded.blocks[0].rnode_spcnode,
dbnode: decoded.blocks[0].rnode_dbnode,
relnode: decoded.blocks[0].rnode_relnode,
};
let mut new_vm_blk = new_heap_blkno.map(pg_constants::HEAPBLK_TO_MAPBLOCK);
let mut old_vm_blk = old_heap_blkno.map(pg_constants::HEAPBLK_TO_MAPBLOCK);
// Sometimes, Postgres seems to create heap WAL records with the
// ALL_VISIBLE_CLEARED flag set, even though the bit in the VM page is
// not set. In fact, it's possible that the VM page does not exist at all.
// In that case, we don't want to store a record to clear the VM bit;
// replaying it would fail to find the previous image of the page, because
// it doesn't exist. So check if the VM page(s) exist, and skip the WAL
// record if it doesn't.
let vm_size = get_relsize(modification, vm_rel, ctx).await?;
if let Some(blknum) = new_vm_blk {
if blknum >= vm_size {
new_vm_blk = None;
}
}
if let Some(blknum) = old_vm_blk {
if blknum >= vm_size {
old_vm_blk = None;
}
}
if new_vm_blk.is_some() || old_vm_blk.is_some() {
if new_vm_blk == old_vm_blk {
// An UPDATE record that needs to clear the bits for both old and the
// new page, both of which reside on the same VM page.
self.put_rel_wal_record(
modification,
vm_rel,
new_vm_blk.unwrap(),
NeonWalRecord::ClearVisibilityMapFlags {
new_heap_blkno,
old_heap_blkno,
flags,
},
ctx,
)
.await?;
} else {
// Clear VM bits for one heap page, or for two pages that reside on
// different VM pages.
if let Some(new_vm_blk) = new_vm_blk {
self.put_rel_wal_record(
modification,
vm_rel,
new_vm_blk,
NeonWalRecord::ClearVisibilityMapFlags {
new_heap_blkno,
old_heap_blkno: None,
flags,
},
ctx,
)
.await?;
}
if let Some(old_vm_blk) = old_vm_blk {
self.put_rel_wal_record(
modification,
vm_rel,
old_vm_blk,
NeonWalRecord::ClearVisibilityMapFlags {
new_heap_blkno: None,
old_heap_blkno,
flags,
},
ctx,
)
.await?;
}
}
}
}
Ok(())
}
/// Subroutine of ingest_record(), to handle an XLOG_DBASE_CREATE record.
async fn ingest_xlog_dbase_create(
&mut self,
modification: &mut DatadirModification<'_>,
rec: &XlCreateDatabase,
ctx: &RequestContext,
) -> anyhow::Result<()> {
let db_id = rec.db_id;
let tablespace_id = rec.tablespace_id;
let src_db_id = rec.src_db_id;
let src_tablespace_id = rec.src_tablespace_id;
let rels = modification
.tline
.list_rels(
src_tablespace_id,
src_db_id,
Version::Modified(modification),
ctx,
)
.await?;
debug!("ingest_xlog_dbase_create: {} rels", rels.len());
// Copy relfilemap
let filemap = modification
.tline
.get_relmap_file(
src_tablespace_id,
src_db_id,
Version::Modified(modification),
ctx,
)
.await?;
modification
.put_relmap_file(tablespace_id, db_id, filemap, ctx)
.await?;
let mut num_rels_copied = 0;
let mut num_blocks_copied = 0;
for src_rel in rels {
assert_eq!(src_rel.spcnode, src_tablespace_id);
assert_eq!(src_rel.dbnode, src_db_id);
let nblocks = modification
.tline
.get_rel_size(src_rel, Version::Modified(modification), ctx)
.await?;
let dst_rel = RelTag {
spcnode: tablespace_id,
dbnode: db_id,
relnode: src_rel.relnode,
forknum: src_rel.forknum,
};
modification.put_rel_creation(dst_rel, nblocks, ctx).await?;
// Copy content
debug!("copying rel {} to {}, {} blocks", src_rel, dst_rel, nblocks);
for blknum in 0..nblocks {
// Sharding:
// - src and dst are always on the same shard, because they differ only by dbNode, and
// dbNode is not included in the hash inputs for sharding.
// - This WAL command is replayed on all shards, but each shard only copies the blocks
// that belong to it.
let src_key = rel_block_to_key(src_rel, blknum);
if !self.shard.is_key_local(&src_key) {
debug!(
"Skipping non-local key {} during XLOG_DBASE_CREATE",
src_key
);
continue;
}
debug!(
"copying block {} from {} ({}) to {}",
blknum, src_rel, src_key, dst_rel
);
let content = modification
.tline
.get_rel_page_at_lsn(src_rel, blknum, Version::Modified(modification), ctx)
.await?;
modification.put_rel_page_image(dst_rel, blknum, content)?;
num_blocks_copied += 1;
}
num_rels_copied += 1;
}
info!(
"Created database {}/{}, copied {} blocks in {} rels",
tablespace_id, db_id, num_blocks_copied, num_rels_copied
);
Ok(())
}
async fn ingest_xlog_smgr_create(
&mut self,
modification: &mut DatadirModification<'_>,
rec: &XlSmgrCreate,
ctx: &RequestContext,
) -> anyhow::Result<()> {
let rel = RelTag {
spcnode: rec.rnode.spcnode,
dbnode: rec.rnode.dbnode,
relnode: rec.rnode.relnode,
forknum: rec.forknum,
};
self.put_rel_creation(modification, rel, ctx).await?;
Ok(())
}
/// Subroutine of ingest_record(), to handle an XLOG_SMGR_TRUNCATE record.
///
/// This is the same logic as in PostgreSQL's smgr_redo() function.
async fn ingest_xlog_smgr_truncate(
&mut self,
modification: &mut DatadirModification<'_>,
rec: &XlSmgrTruncate,
ctx: &RequestContext,
) -> anyhow::Result<()> {
let spcnode = rec.rnode.spcnode;
let dbnode = rec.rnode.dbnode;
let relnode = rec.rnode.relnode;
if (rec.flags & pg_constants::SMGR_TRUNCATE_HEAP) != 0 {
let rel = RelTag {
spcnode,
dbnode,
relnode,
forknum: MAIN_FORKNUM,
};
self.put_rel_truncation(modification, rel, rec.blkno, ctx)
.await?;
}
if (rec.flags & pg_constants::SMGR_TRUNCATE_FSM) != 0 {
let rel = RelTag {
spcnode,
dbnode,
relnode,
forknum: FSM_FORKNUM,
};
let fsm_logical_page_no = rec.blkno / pg_constants::SLOTS_PER_FSM_PAGE;
let mut fsm_physical_page_no = fsm_logical_to_physical(fsm_logical_page_no);
if rec.blkno % pg_constants::SLOTS_PER_FSM_PAGE != 0 {
// Tail of last remaining FSM page has to be zeroed.
// We are not precise here and instead of digging in FSM bitmap format just clear the whole page.
modification.put_rel_page_image(rel, fsm_physical_page_no, ZERO_PAGE.clone())?;
fsm_physical_page_no += 1;
}
let nblocks = get_relsize(modification, rel, ctx).await?;
if nblocks > fsm_physical_page_no {
// check if something to do: FSM is larger than truncate position
self.put_rel_truncation(modification, rel, fsm_physical_page_no, ctx)
.await?;
}
}
if (rec.flags & pg_constants::SMGR_TRUNCATE_VM) != 0 {
let rel = RelTag {
spcnode,
dbnode,
relnode,
forknum: VISIBILITYMAP_FORKNUM,
};
let mut vm_page_no = rec.blkno / pg_constants::VM_HEAPBLOCKS_PER_PAGE;
if rec.blkno % pg_constants::VM_HEAPBLOCKS_PER_PAGE != 0 {
// Tail of last remaining vm page has to be zeroed.
// We are not precise here and instead of digging in VM bitmap format just clear the whole page.
modification.put_rel_page_image(rel, vm_page_no, ZERO_PAGE.clone())?;
vm_page_no += 1;
}
let nblocks = get_relsize(modification, rel, ctx).await?;
if nblocks > vm_page_no {
// check if something to do: VM is larger than truncate position
self.put_rel_truncation(modification, rel, vm_page_no, ctx)
.await?;
}
}
Ok(())
}
/// Subroutine of ingest_record(), to handle an XLOG_XACT_* records.
///
async fn ingest_xact_record(
&mut self,
modification: &mut DatadirModification<'_>,
parsed: &XlXactParsedRecord,
is_commit: bool,
ctx: &RequestContext,
) -> anyhow::Result<()> {
// Record update of CLOG pages
let mut pageno = parsed.xid / pg_constants::CLOG_XACTS_PER_PAGE;
let mut segno = pageno / pg_constants::SLRU_PAGES_PER_SEGMENT;
let mut rpageno = pageno % pg_constants::SLRU_PAGES_PER_SEGMENT;
let mut page_xids: Vec<TransactionId> = vec![parsed.xid];
for subxact in &parsed.subxacts {
let subxact_pageno = subxact / pg_constants::CLOG_XACTS_PER_PAGE;
if subxact_pageno != pageno {
// This subxact goes to different page. Write the record
// for all the XIDs on the previous page, and continue
// accumulating XIDs on this new page.
modification.put_slru_wal_record(
SlruKind::Clog,
segno,
rpageno,
if is_commit {
NeonWalRecord::ClogSetCommitted {
xids: page_xids,
timestamp: parsed.xact_time,
}
} else {
NeonWalRecord::ClogSetAborted { xids: page_xids }
},
)?;
page_xids = Vec::new();
}
pageno = subxact_pageno;
segno = pageno / pg_constants::SLRU_PAGES_PER_SEGMENT;
rpageno = pageno % pg_constants::SLRU_PAGES_PER_SEGMENT;
page_xids.push(*subxact);
}
modification.put_slru_wal_record(
SlruKind::Clog,
segno,
rpageno,
if is_commit {
NeonWalRecord::ClogSetCommitted {
xids: page_xids,
timestamp: parsed.xact_time,
}
} else {
NeonWalRecord::ClogSetAborted { xids: page_xids }
},
)?;
for xnode in &parsed.xnodes {
for forknum in MAIN_FORKNUM..=INIT_FORKNUM {
let rel = RelTag {
forknum,
spcnode: xnode.spcnode,
dbnode: xnode.dbnode,
relnode: xnode.relnode,
};
if modification
.tline
.get_rel_exists(rel, Version::Modified(modification), ctx)
.await?
{
self.put_rel_drop(modification, rel, ctx).await?;
}
}
}
Ok(())
}
async fn ingest_clog_truncate_record(
&mut self,
modification: &mut DatadirModification<'_>,
xlrec: &XlClogTruncate,
ctx: &RequestContext,
) -> anyhow::Result<()> {
info!(
"RM_CLOG_ID truncate pageno {} oldestXid {} oldestXidDB {}",
xlrec.pageno, xlrec.oldest_xid, xlrec.oldest_xid_db
);
// Here we treat oldestXid and oldestXidDB
// differently from postgres redo routines.
// In postgres checkpoint.oldestXid lags behind xlrec.oldest_xid
// until checkpoint happens and updates the value.
// Here we can use the most recent value.
// It's just an optimization, though and can be deleted.
// TODO Figure out if there will be any issues with replica.
self.checkpoint.oldestXid = xlrec.oldest_xid;
self.checkpoint.oldestXidDB = xlrec.oldest_xid_db;
self.checkpoint_modified = true;
// TODO Treat AdvanceOldestClogXid() or write a comment why we don't need it
let latest_page_number =
self.checkpoint.nextXid.value as u32 / pg_constants::CLOG_XACTS_PER_PAGE;
// Now delete all segments containing pages between xlrec.pageno
// and latest_page_number.
// First, make an important safety check:
// the current endpoint page must not be eligible for removal.
// See SimpleLruTruncate() in slru.c
if clogpage_precedes(latest_page_number, xlrec.pageno) {
info!("could not truncate directory pg_xact apparent wraparound");
return Ok(());
}
// Iterate via SLRU CLOG segments and drop segments that we're ready to truncate
//
// We cannot pass 'lsn' to the Timeline.list_nonrels(), or it
// will block waiting for the last valid LSN to advance up to
// it. So we use the previous record's LSN in the get calls
// instead.
for segno in modification
.tline
.list_slru_segments(SlruKind::Clog, Version::Modified(modification), ctx)
.await?
{
let segpage = segno * pg_constants::SLRU_PAGES_PER_SEGMENT;
if slru_may_delete_clogsegment(segpage, xlrec.pageno) {
modification
.drop_slru_segment(SlruKind::Clog, segno, ctx)
.await?;
trace!("Drop CLOG segment {:>04X}", segno);
}
}
Ok(())
}
fn ingest_multixact_create_record(
&mut self,
modification: &mut DatadirModification,
xlrec: &XlMultiXactCreate,
) -> Result<()> {
// Create WAL record for updating the multixact-offsets page
let pageno = xlrec.mid / pg_constants::MULTIXACT_OFFSETS_PER_PAGE as u32;
let segno = pageno / pg_constants::SLRU_PAGES_PER_SEGMENT;
let rpageno = pageno % pg_constants::SLRU_PAGES_PER_SEGMENT;
modification.put_slru_wal_record(
SlruKind::MultiXactOffsets,
segno,
rpageno,
NeonWalRecord::MultixactOffsetCreate {
mid: xlrec.mid,
moff: xlrec.moff,
},
)?;
// Create WAL records for the update of each affected multixact-members page
let mut members = xlrec.members.iter();
let mut offset = xlrec.moff;
loop {
let pageno = offset / pg_constants::MULTIXACT_MEMBERS_PER_PAGE as u32;
// How many members fit on this page?
let page_remain = pg_constants::MULTIXACT_MEMBERS_PER_PAGE as u32
- offset % pg_constants::MULTIXACT_MEMBERS_PER_PAGE as u32;
let mut this_page_members: Vec<MultiXactMember> = Vec::new();
for _ in 0..page_remain {
if let Some(m) = members.next() {
this_page_members.push(m.clone());
} else {
break;
}
}
if this_page_members.is_empty() {
// all done
break;
}
let n_this_page = this_page_members.len();
modification.put_slru_wal_record(
SlruKind::MultiXactMembers,
pageno / pg_constants::SLRU_PAGES_PER_SEGMENT,
pageno % pg_constants::SLRU_PAGES_PER_SEGMENT,
NeonWalRecord::MultixactMembersCreate {
moff: offset,
members: this_page_members,
},
)?;
// Note: The multixact members can wrap around, even within one WAL record.
offset = offset.wrapping_add(n_this_page as u32);
}
if xlrec.mid >= self.checkpoint.nextMulti {
self.checkpoint.nextMulti = xlrec.mid + 1;
self.checkpoint_modified = true;
}
if xlrec.moff + xlrec.nmembers > self.checkpoint.nextMultiOffset {
self.checkpoint.nextMultiOffset = xlrec.moff + xlrec.nmembers;
self.checkpoint_modified = true;
}
let max_mbr_xid = xlrec.members.iter().fold(None, |acc, mbr| {
if let Some(max_xid) = acc {
if mbr.xid.wrapping_sub(max_xid) as i32 > 0 {
Some(mbr.xid)
} else {
acc
}
} else {
Some(mbr.xid)
}
});
if let Some(max_xid) = max_mbr_xid {
if self.checkpoint.update_next_xid(max_xid) {
self.checkpoint_modified = true;
}
}
Ok(())
}
async fn ingest_multixact_truncate_record(
&mut self,
modification: &mut DatadirModification<'_>,
xlrec: &XlMultiXactTruncate,
ctx: &RequestContext,
) -> Result<()> {
self.checkpoint.oldestMulti = xlrec.end_trunc_off;
self.checkpoint.oldestMultiDB = xlrec.oldest_multi_db;
self.checkpoint_modified = true;
// PerformMembersTruncation
let maxsegment: i32 = mx_offset_to_member_segment(pg_constants::MAX_MULTIXACT_OFFSET);
let startsegment: i32 = mx_offset_to_member_segment(xlrec.start_trunc_memb);
let endsegment: i32 = mx_offset_to_member_segment(xlrec.end_trunc_memb);
let mut segment: i32 = startsegment;
// Delete all the segments except the last one. The last segment can still
// contain, possibly partially, valid data.
while segment != endsegment {
modification
.drop_slru_segment(SlruKind::MultiXactMembers, segment as u32, ctx)
.await?;
/* move to next segment, handling wraparound correctly */
if segment == maxsegment {
segment = 0;
} else {
segment += 1;
}
}
// Truncate offsets
// FIXME: this did not handle wraparound correctly
Ok(())
}
async fn ingest_relmap_page(
&mut self,
modification: &mut DatadirModification<'_>,
xlrec: &XlRelmapUpdate,
decoded: &DecodedWALRecord,
ctx: &RequestContext,
) -> Result<()> {
let mut buf = decoded.record.clone();
buf.advance(decoded.main_data_offset);
// skip xl_relmap_update
buf.advance(12);
modification
.put_relmap_file(
xlrec.tsid,
xlrec.dbid,
Bytes::copy_from_slice(&buf[..]),
ctx,
)
.await
}
async fn put_rel_creation(
&mut self,
modification: &mut DatadirModification<'_>,
rel: RelTag,
ctx: &RequestContext,
) -> Result<()> {
modification.put_rel_creation(rel, 0, ctx).await?;
Ok(())
}
async fn put_rel_page_image(
&mut self,
modification: &mut DatadirModification<'_>,
rel: RelTag,
blknum: BlockNumber,
img: Bytes,
ctx: &RequestContext,
) -> Result<(), PageReconstructError> {
self.handle_rel_extend(modification, rel, blknum, ctx)
.await?;
modification.put_rel_page_image(rel, blknum, img)?;
Ok(())
}
async fn put_rel_wal_record(
&mut self,
modification: &mut DatadirModification<'_>,
rel: RelTag,
blknum: BlockNumber,
rec: NeonWalRecord,
ctx: &RequestContext,
) -> Result<()> {
self.handle_rel_extend(modification, rel, blknum, ctx)
.await?;
modification.put_rel_wal_record(rel, blknum, rec)?;
Ok(())
}
async fn put_rel_truncation(
&mut self,
modification: &mut DatadirModification<'_>,
rel: RelTag,
nblocks: BlockNumber,
ctx: &RequestContext,
) -> anyhow::Result<()> {
modification.put_rel_truncation(rel, nblocks, ctx).await?;
Ok(())
}
async fn put_rel_drop(
&mut self,
modification: &mut DatadirModification<'_>,
rel: RelTag,
ctx: &RequestContext,
) -> Result<()> {
modification.put_rel_drop(rel, ctx).await?;
Ok(())
}
async fn handle_rel_extend(
&mut self,
modification: &mut DatadirModification<'_>,
rel: RelTag,
blknum: BlockNumber,
ctx: &RequestContext,
) -> Result<(), PageReconstructError> {
let new_nblocks = blknum + 1;
// Check if the relation exists. We implicitly create relations on first
// record.
// TODO: would be nice if to be more explicit about it
// Get current size and put rel creation if rel doesn't exist
//
// NOTE: we check the cache first even though get_rel_exists and get_rel_size would
// check the cache too. This is because eagerly checking the cache results in
// less work overall and 10% better performance. It's more work on cache miss
// but cache miss is rare.
let old_nblocks = if let Some(nblocks) = modification
.tline
.get_cached_rel_size(&rel, modification.get_lsn())
{
nblocks
} else if !modification
.tline
.get_rel_exists(rel, Version::Modified(modification), ctx)
.await?
{
// create it with 0 size initially, the logic below will extend it
modification
.put_rel_creation(rel, 0, ctx)
.await
.context("Relation Error")?;
0
} else {
modification
.tline
.get_rel_size(rel, Version::Modified(modification), ctx)
.await?
};
if new_nblocks > old_nblocks {
//info!("extending {} {} to {}", rel, old_nblocks, new_nblocks);
modification.put_rel_extend(rel, new_nblocks, ctx).await?;
let mut key = rel_block_to_key(rel, blknum);
// fill the gap with zeros
for gap_blknum in old_nblocks..blknum {
key.field6 = gap_blknum;
if self.shard.get_shard_number(&key) != self.shard.number {
continue;
}
modification.put_rel_page_image(rel, gap_blknum, ZERO_PAGE.clone())?;
}
}
Ok(())
}
async fn put_slru_page_image(
&mut self,
modification: &mut DatadirModification<'_>,
kind: SlruKind,
segno: u32,
blknum: BlockNumber,
img: Bytes,
ctx: &RequestContext,
) -> Result<()> {
self.handle_slru_extend(modification, kind, segno, blknum, ctx)
.await?;
modification.put_slru_page_image(kind, segno, blknum, img)?;
Ok(())
}
async fn handle_slru_extend(
&mut self,
modification: &mut DatadirModification<'_>,
kind: SlruKind,
segno: u32,
blknum: BlockNumber,
ctx: &RequestContext,
) -> anyhow::Result<()> {
// we don't use a cache for this like we do for relations. SLRUS are explcitly
// extended with ZEROPAGE records, not with commit records, so it happens
// a lot less frequently.
let new_nblocks = blknum + 1;
// Check if the relation exists. We implicitly create relations on first
// record.
// TODO: would be nice if to be more explicit about it
let old_nblocks = if !modification
.tline
.get_slru_segment_exists(kind, segno, Version::Modified(modification), ctx)
.await?
{
// create it with 0 size initially, the logic below will extend it
modification
.put_slru_segment_creation(kind, segno, 0, ctx)
.await?;
0
} else {
modification
.tline
.get_slru_segment_size(kind, segno, Version::Modified(modification), ctx)
.await?
};
if new_nblocks > old_nblocks {
trace!(
"extending SLRU {:?} seg {} from {} to {} blocks",
kind,
segno,
old_nblocks,
new_nblocks
);
modification.put_slru_extend(kind, segno, new_nblocks)?;
// fill the gap with zeros
for gap_blknum in old_nblocks..blknum {
modification.put_slru_page_image(kind, segno, gap_blknum, ZERO_PAGE.clone())?;
}
}
Ok(())
}
}
async fn get_relsize(
modification: &DatadirModification<'_>,
rel: RelTag,
ctx: &RequestContext,
) -> anyhow::Result<BlockNumber> {
let nblocks = if !modification
.tline
.get_rel_exists(rel, Version::Modified(modification), ctx)
.await?
{
0
} else {
modification
.tline
.get_rel_size(rel, Version::Modified(modification), ctx)
.await?
};
Ok(nblocks)
}
#[allow(clippy::bool_assert_comparison)]
#[cfg(test)]
mod tests {
use super::*;
use crate::tenant::harness::*;
use crate::tenant::remote_timeline_client::{remote_initdb_archive_path, INITDB_PATH};
use postgres_ffi::RELSEG_SIZE;
use crate::DEFAULT_PG_VERSION;
/// Arbitrary relation tag, for testing.
const TESTREL_A: RelTag = RelTag {
spcnode: 0,
dbnode: 111,
relnode: 1000,
forknum: 0,
};
fn assert_current_logical_size(_timeline: &Timeline, _lsn: Lsn) {
// TODO
}
static ZERO_CHECKPOINT: Bytes = Bytes::from_static(&[0u8; SIZEOF_CHECKPOINT]);
async fn init_walingest_test(tline: &Timeline, ctx: &RequestContext) -> Result<WalIngest> {
let mut m = tline.begin_modification(Lsn(0x10));
m.put_checkpoint(ZERO_CHECKPOINT.clone())?;
m.put_relmap_file(0, 111, Bytes::from(""), ctx).await?; // dummy relmapper file
m.commit(ctx).await?;
let walingest = WalIngest::new(tline, Lsn(0x10), ctx).await?;
Ok(walingest)
}
#[tokio::test]
async fn test_relsize() -> Result<()> {
let (tenant, ctx) = TenantHarness::create("test_relsize")?.load().await;
let tline = tenant
.create_test_timeline(TIMELINE_ID, Lsn(8), DEFAULT_PG_VERSION, &ctx)
.await?;
let mut walingest = init_walingest_test(&tline, &ctx).await?;
let mut m = tline.begin_modification(Lsn(0x20));
walingest.put_rel_creation(&mut m, TESTREL_A, &ctx).await?;
walingest
.put_rel_page_image(&mut m, TESTREL_A, 0, test_img("foo blk 0 at 2"), &ctx)
.await?;
m.commit(&ctx).await?;
let mut m = tline.begin_modification(Lsn(0x30));
walingest
.put_rel_page_image(&mut m, TESTREL_A, 0, test_img("foo blk 0 at 3"), &ctx)
.await?;
m.commit(&ctx).await?;
let mut m = tline.begin_modification(Lsn(0x40));
walingest
.put_rel_page_image(&mut m, TESTREL_A, 1, test_img("foo blk 1 at 4"), &ctx)
.await?;
m.commit(&ctx).await?;
let mut m = tline.begin_modification(Lsn(0x50));
walingest
.put_rel_page_image(&mut m, TESTREL_A, 2, test_img("foo blk 2 at 5"), &ctx)
.await?;
m.commit(&ctx).await?;
assert_current_logical_size(&tline, Lsn(0x50));
// The relation was created at LSN 2, not visible at LSN 1 yet.
assert_eq!(
tline
.get_rel_exists(TESTREL_A, Version::Lsn(Lsn(0x10)), &ctx)
.await?,
false
);
assert!(tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x10)), &ctx)
.await
.is_err());
assert_eq!(
tline
.get_rel_exists(TESTREL_A, Version::Lsn(Lsn(0x20)), &ctx)
.await?,
true
);
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x20)), &ctx)
.await?,
1
);
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x50)), &ctx)
.await?,
3
);
// Check page contents at each LSN
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 0, Version::Lsn(Lsn(0x20)), &ctx)
.await?,
test_img("foo blk 0 at 2")
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 0, Version::Lsn(Lsn(0x30)), &ctx)
.await?,
test_img("foo blk 0 at 3")
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 0, Version::Lsn(Lsn(0x40)), &ctx)
.await?,
test_img("foo blk 0 at 3")
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 1, Version::Lsn(Lsn(0x40)), &ctx)
.await?,
test_img("foo blk 1 at 4")
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 0, Version::Lsn(Lsn(0x50)), &ctx)
.await?,
test_img("foo blk 0 at 3")
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 1, Version::Lsn(Lsn(0x50)), &ctx)
.await?,
test_img("foo blk 1 at 4")
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 2, Version::Lsn(Lsn(0x50)), &ctx)
.await?,
test_img("foo blk 2 at 5")
);
// Truncate last block
let mut m = tline.begin_modification(Lsn(0x60));
walingest
.put_rel_truncation(&mut m, TESTREL_A, 2, &ctx)
.await?;
m.commit(&ctx).await?;
assert_current_logical_size(&tline, Lsn(0x60));
// Check reported size and contents after truncation
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x60)), &ctx)
.await?,
2
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 0, Version::Lsn(Lsn(0x60)), &ctx)
.await?,
test_img("foo blk 0 at 3")
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 1, Version::Lsn(Lsn(0x60)), &ctx)
.await?,
test_img("foo blk 1 at 4")
);
// should still see the truncated block with older LSN
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x50)), &ctx)
.await?,
3
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 2, Version::Lsn(Lsn(0x50)), &ctx)
.await?,
test_img("foo blk 2 at 5")
);
// Truncate to zero length
let mut m = tline.begin_modification(Lsn(0x68));
walingest
.put_rel_truncation(&mut m, TESTREL_A, 0, &ctx)
.await?;
m.commit(&ctx).await?;
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x68)), &ctx)
.await?,
0
);
// Extend from 0 to 2 blocks, leaving a gap
let mut m = tline.begin_modification(Lsn(0x70));
walingest
.put_rel_page_image(&mut m, TESTREL_A, 1, test_img("foo blk 1"), &ctx)
.await?;
m.commit(&ctx).await?;
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x70)), &ctx)
.await?,
2
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 0, Version::Lsn(Lsn(0x70)), &ctx)
.await?,
ZERO_PAGE
);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 1, Version::Lsn(Lsn(0x70)), &ctx)
.await?,
test_img("foo blk 1")
);
// Extend a lot more, leaving a big gap that spans across segments
let mut m = tline.begin_modification(Lsn(0x80));
walingest
.put_rel_page_image(&mut m, TESTREL_A, 1500, test_img("foo blk 1500"), &ctx)
.await?;
m.commit(&ctx).await?;
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x80)), &ctx)
.await?,
1501
);
for blk in 2..1500 {
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, blk, Version::Lsn(Lsn(0x80)), &ctx)
.await?,
ZERO_PAGE
);
}
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, 1500, Version::Lsn(Lsn(0x80)), &ctx)
.await?,
test_img("foo blk 1500")
);
Ok(())
}
// Test what happens if we dropped a relation
// and then created it again within the same layer.
#[tokio::test]
async fn test_drop_extend() -> Result<()> {
let (tenant, ctx) = TenantHarness::create("test_drop_extend")?.load().await;
let tline = tenant
.create_test_timeline(TIMELINE_ID, Lsn(8), DEFAULT_PG_VERSION, &ctx)
.await?;
let mut walingest = init_walingest_test(&tline, &ctx).await?;
let mut m = tline.begin_modification(Lsn(0x20));
walingest
.put_rel_page_image(&mut m, TESTREL_A, 0, test_img("foo blk 0 at 2"), &ctx)
.await?;
m.commit(&ctx).await?;
// Check that rel exists and size is correct
assert_eq!(
tline
.get_rel_exists(TESTREL_A, Version::Lsn(Lsn(0x20)), &ctx)
.await?,
true
);
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x20)), &ctx)
.await?,
1
);
// Drop rel
let mut m = tline.begin_modification(Lsn(0x30));
walingest.put_rel_drop(&mut m, TESTREL_A, &ctx).await?;
m.commit(&ctx).await?;
// Check that rel is not visible anymore
assert_eq!(
tline
.get_rel_exists(TESTREL_A, Version::Lsn(Lsn(0x30)), &ctx)
.await?,
false
);
// FIXME: should fail
//assert!(tline.get_rel_size(TESTREL_A, Lsn(0x30), false)?.is_none());
// Re-create it
let mut m = tline.begin_modification(Lsn(0x40));
walingest
.put_rel_page_image(&mut m, TESTREL_A, 0, test_img("foo blk 0 at 4"), &ctx)
.await?;
m.commit(&ctx).await?;
// Check that rel exists and size is correct
assert_eq!(
tline
.get_rel_exists(TESTREL_A, Version::Lsn(Lsn(0x40)), &ctx)
.await?,
true
);
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x40)), &ctx)
.await?,
1
);
Ok(())
}
// Test what happens if we truncated a relation
// so that one of its segments was dropped
// and then extended it again within the same layer.
#[tokio::test]
async fn test_truncate_extend() -> Result<()> {
let (tenant, ctx) = TenantHarness::create("test_truncate_extend")?.load().await;
let tline = tenant
.create_test_timeline(TIMELINE_ID, Lsn(8), DEFAULT_PG_VERSION, &ctx)
.await?;
let mut walingest = init_walingest_test(&tline, &ctx).await?;
// Create a 20 MB relation (the size is arbitrary)
let relsize = 20 * 1024 * 1024 / 8192;
let mut m = tline.begin_modification(Lsn(0x20));
for blkno in 0..relsize {
let data = format!("foo blk {} at {}", blkno, Lsn(0x20));
walingest
.put_rel_page_image(&mut m, TESTREL_A, blkno, test_img(&data), &ctx)
.await?;
}
m.commit(&ctx).await?;
// The relation was created at LSN 20, not visible at LSN 1 yet.
assert_eq!(
tline
.get_rel_exists(TESTREL_A, Version::Lsn(Lsn(0x10)), &ctx)
.await?,
false
);
assert!(tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x10)), &ctx)
.await
.is_err());
assert_eq!(
tline
.get_rel_exists(TESTREL_A, Version::Lsn(Lsn(0x20)), &ctx)
.await?,
true
);
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x20)), &ctx)
.await?,
relsize
);
// Check relation content
for blkno in 0..relsize {
let lsn = Lsn(0x20);
let data = format!("foo blk {} at {}", blkno, lsn);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, blkno, Version::Lsn(lsn), &ctx)
.await?,
test_img(&data)
);
}
// Truncate relation so that second segment was dropped
// - only leave one page
let mut m = tline.begin_modification(Lsn(0x60));
walingest
.put_rel_truncation(&mut m, TESTREL_A, 1, &ctx)
.await?;
m.commit(&ctx).await?;
// Check reported size and contents after truncation
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x60)), &ctx)
.await?,
1
);
for blkno in 0..1 {
let lsn = Lsn(0x20);
let data = format!("foo blk {} at {}", blkno, lsn);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, blkno, Version::Lsn(Lsn(0x60)), &ctx)
.await?,
test_img(&data)
);
}
// should still see all blocks with older LSN
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x50)), &ctx)
.await?,
relsize
);
for blkno in 0..relsize {
let lsn = Lsn(0x20);
let data = format!("foo blk {} at {}", blkno, lsn);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, blkno, Version::Lsn(Lsn(0x50)), &ctx)
.await?,
test_img(&data)
);
}
// Extend relation again.
// Add enough blocks to create second segment
let lsn = Lsn(0x80);
let mut m = tline.begin_modification(lsn);
for blkno in 0..relsize {
let data = format!("foo blk {} at {}", blkno, lsn);
walingest
.put_rel_page_image(&mut m, TESTREL_A, blkno, test_img(&data), &ctx)
.await?;
}
m.commit(&ctx).await?;
assert_eq!(
tline
.get_rel_exists(TESTREL_A, Version::Lsn(Lsn(0x80)), &ctx)
.await?,
true
);
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(0x80)), &ctx)
.await?,
relsize
);
// Check relation content
for blkno in 0..relsize {
let lsn = Lsn(0x80);
let data = format!("foo blk {} at {}", blkno, lsn);
assert_eq!(
tline
.get_rel_page_at_lsn(TESTREL_A, blkno, Version::Lsn(Lsn(0x80)), &ctx)
.await?,
test_img(&data)
);
}
Ok(())
}
/// Test get_relsize() and truncation with a file larger than 1 GB, so that it's
/// split into multiple 1 GB segments in Postgres.
#[tokio::test]
async fn test_large_rel() -> Result<()> {
let (tenant, ctx) = TenantHarness::create("test_large_rel")?.load().await;
let tline = tenant
.create_test_timeline(TIMELINE_ID, Lsn(8), DEFAULT_PG_VERSION, &ctx)
.await?;
let mut walingest = init_walingest_test(&tline, &ctx).await?;
let mut lsn = 0x10;
for blknum in 0..RELSEG_SIZE + 1 {
lsn += 0x10;
let mut m = tline.begin_modification(Lsn(lsn));
let img = test_img(&format!("foo blk {} at {}", blknum, Lsn(lsn)));
walingest
.put_rel_page_image(&mut m, TESTREL_A, blknum as BlockNumber, img, &ctx)
.await?;
m.commit(&ctx).await?;
}
assert_current_logical_size(&tline, Lsn(lsn));
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(lsn)), &ctx)
.await?,
RELSEG_SIZE + 1
);
// Truncate one block
lsn += 0x10;
let mut m = tline.begin_modification(Lsn(lsn));
walingest
.put_rel_truncation(&mut m, TESTREL_A, RELSEG_SIZE, &ctx)
.await?;
m.commit(&ctx).await?;
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(lsn)), &ctx)
.await?,
RELSEG_SIZE
);
assert_current_logical_size(&tline, Lsn(lsn));
// Truncate another block
lsn += 0x10;
let mut m = tline.begin_modification(Lsn(lsn));
walingest
.put_rel_truncation(&mut m, TESTREL_A, RELSEG_SIZE - 1, &ctx)
.await?;
m.commit(&ctx).await?;
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(lsn)), &ctx)
.await?,
RELSEG_SIZE - 1
);
assert_current_logical_size(&tline, Lsn(lsn));
// Truncate to 1500, and then truncate all the way down to 0, one block at a time
// This tests the behavior at segment boundaries
let mut size: i32 = 3000;
while size >= 0 {
lsn += 0x10;
let mut m = tline.begin_modification(Lsn(lsn));
walingest
.put_rel_truncation(&mut m, TESTREL_A, size as BlockNumber, &ctx)
.await?;
m.commit(&ctx).await?;
assert_eq!(
tline
.get_rel_size(TESTREL_A, Version::Lsn(Lsn(lsn)), &ctx)
.await?,
size as BlockNumber
);
size -= 1;
}
assert_current_logical_size(&tline, Lsn(lsn));
Ok(())
}
/// Replay a wal segment file taken directly from safekeepers.
///
/// This test is useful for benchmarking since it allows us to profile only
/// the walingest code in a single-threaded executor, and iterate more quickly
/// without waiting for unrelated steps.
#[tokio::test]
async fn test_ingest_real_wal() {
use crate::tenant::harness::*;
use postgres_ffi::waldecoder::WalStreamDecoder;
use postgres_ffi::WAL_SEGMENT_SIZE;
// Define test data path and constants.
//
// Steps to reconstruct the data, if needed:
// 1. Run the pgbench python test
// 2. Take the first wal segment file from safekeeper
// 3. Compress it using `zstd --long input_file`
// 4. Copy initdb.tar.zst from local_fs_remote_storage
// 5. Grep sk logs for "restart decoder" to get startpoint
// 6. Run just the decoder from this test to get the endpoint.
// It's the last LSN the decoder will output.
let pg_version = 15; // The test data was generated by pg15
let path = "test_data/sk_wal_segment_from_pgbench";
let wal_segment_path = format!("{path}/000000010000000000000001.zst");
let source_initdb_path = format!("{path}/{INITDB_PATH}");
let startpoint = Lsn::from_hex("14AEC08").unwrap();
let _endpoint = Lsn::from_hex("1FFFF98").unwrap();
let harness = TenantHarness::create("test_ingest_real_wal").unwrap();
let (tenant, ctx) = harness.load().await;
let remote_initdb_path =
remote_initdb_archive_path(&tenant.tenant_shard_id().tenant_id, &TIMELINE_ID);
let initdb_path = harness.remote_fs_dir.join(remote_initdb_path.get_path());
std::fs::create_dir_all(initdb_path.parent().unwrap())
.expect("creating test dir should work");
std::fs::copy(source_initdb_path, initdb_path).expect("copying the initdb.tar.zst works");
// Bootstrap a real timeline. We can't use create_test_timeline because
// it doesn't create a real checkpoint, and Walingest::new tries to parse
// the garbage data.
let tline = tenant
.bootstrap_timeline_test(TIMELINE_ID, pg_version, Some(TIMELINE_ID), &ctx)
.await
.unwrap();
// We fully read and decompress this into memory before decoding
// to get a more accurate perf profile of the decoder.
let bytes = {
use async_compression::tokio::bufread::ZstdDecoder;
let file = tokio::fs::File::open(wal_segment_path).await.unwrap();
let reader = tokio::io::BufReader::new(file);
let decoder = ZstdDecoder::new(reader);
let mut reader = tokio::io::BufReader::new(decoder);
let mut buffer = Vec::new();
tokio::io::copy_buf(&mut reader, &mut buffer).await.unwrap();
buffer
};
// TODO start a profiler too
let started_at = std::time::Instant::now();
// Initialize walingest
let xlogoff: usize = startpoint.segment_offset(WAL_SEGMENT_SIZE);
let mut decoder = WalStreamDecoder::new(startpoint, pg_version);
let mut walingest = WalIngest::new(tline.as_ref(), startpoint, &ctx)
.await
.unwrap();
let mut modification = tline.begin_modification(startpoint);
let mut decoded = DecodedWALRecord::default();
println!("decoding {} bytes", bytes.len() - xlogoff);
// Decode and ingest wal. We process the wal in chunks because
// that's what happens when we get bytes from safekeepers.
for chunk in bytes[xlogoff..].chunks(50) {
decoder.feed_bytes(chunk);
while let Some((lsn, recdata)) = decoder.poll_decode().unwrap() {
walingest
.ingest_record(recdata, lsn, &mut modification, &mut decoded, &ctx)
.await
.unwrap();
}
modification.commit(&ctx).await.unwrap();
}
let duration = started_at.elapsed();
println!("done in {:?}", duration);
}
}
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