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Store page image with the same LSN as replaced WAL record

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This commit is contained in:
Konstantin Knizhnik
2021-07-09 12:16:53 +03:00
parent 75e717fe86
commit 577af8a459
1 changed files with 6 additions and 6 deletions
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12
pageserver/src/object_repository.rs
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@@ -599,16 +599,16 @@ impl Timeline for ObjectTimeline {
}
impl ObjectTimeline {
fn get_page_at_lsn_nowait(&self, tag: BufferTag, lsn: Lsn) -> Result<Bytes> {
fn get_page_at_lsn_nowait(&self, tag: BufferTag, req_lsn: Lsn) -> Result<Bytes> {
// Look up the page entry. If it's a page image, return that. If it's a WAL record,
// ask the WAL redo service to reconstruct the page image from the WAL records.
let searchkey = ObjectKey {
timeline: self.timelineid,
tag: ObjectTag::RelationBuffer(tag),
};
let mut iter = self.object_versions(&*self.obj_store, &searchkey, lsn)?;
let mut iter = self.object_versions(&*self.obj_store, &searchkey, req_lsn)?;
if let Some((version_lsn, value)) = iter.next().transpose()? {
if let Some((lsn, value)) = iter.next().transpose()? {
let page_img: Bytes;
match ObjectValue::des_page(&value)? {
@@ -636,13 +636,13 @@ impl ObjectTimeline {
page_lsn_lo,
tag.rel,
tag.blknum,
version_lsn,
lsn
lsn,
req_lsn
);
return Ok(page_img);
}
static ZERO_PAGE: [u8; 8192] = [0u8; 8192];
trace!("page {} blk {} at {} not found", tag.rel, tag.blknum, lsn);
trace!("page {} blk {} at {} not found", tag.rel, tag.blknum, req_lsn);
Ok(Bytes::from_static(&ZERO_PAGE))
/* return Err("could not find page image")?; */
}