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Add 'dump_layerfile' utility for debugging.

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Seems handy for getting a quick idea of what's stored in an
image or delta layer file.

Example output on a file after runnnig pgbench for a while:

    % ./target/debug/dump_layerfile pgbench_layers/pg_control_checkpoint_0_00000000016B914A
    ----- image layer for checkpoint.0 at 0/16B914A ----
    non-blocky (88 bytes)
    % ./target/debug/dump_layerfile pgbench_layers/pg_xact_0000_0_000000000412FD40
    ----- image layer for pg_xact/0000.0 at 0/412FD40 ----
    (1) blocks
    % ./target/debug/dump_layerfile pgbench_layers/rel_1663_14236_1247_0_0_00000000016B914A_000000000412FD40 | head -n 20
    ----- delta layer for 1663/14236/1247.0 0/16B914A-0/412FD40 ----
    --- relsizes ---
      0/16B914A: 14
      0/16CA559: 15
    --- page versions ---
      blk 13 at 0/16BB1D2:  rec 8162 bytes will_init: true HEAP INSERT
      blk 14 at 0/16CA559:  rec 8241 bytes will_init: true XLOG FPI
      blk 14 at 0/16CA637:  rec 215 bytes will_init: true HEAP INSERT
      blk 14 at 0/16DF14F:  rec 215 bytes will_init: false HEAP INSERT
      blk 14 at 0/16DF3A7:  rec 215 bytes will_init: false HEAP INSERT
      blk 14 at 0/16E0637:  rec 215 bytes will_init: false HEAP INSERT
      blk 14 at 0/16E088F:  rec 215 bytes will_init: false HEAP INSERT
      blk 14 at 0/16E5F9F:  rec 215 bytes will_init: false HEAP INSERT
      blk 14 at 0/16E620F:  rec 215 bytes will_init: false HEAP INSERT
This commit is contained in:
Heikki Linnakangas
2021-08-27 21:10:17 +03:00
committed by Patrick Insinger
parent 5ac3cb1c72
commit d7bebd8074
9 changed files with 295 additions and 50 deletions
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25
pageserver/src/bin/dump_layerfile.rs Normal file
View File

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//! Main entry point for the dump_layerfile executable
//!
//! A handy tool for debugging, that's all.
use anyhow::Result;
use clap::{App, Arg};
use pageserver::layered_repository::dump_layerfile_from_path;
use std::path::PathBuf;
fn main() -> Result<()> {
let arg_matches = App::new("Zenith dump_layerfile utility")
.about("Dump contents of one layer file, for debugging")
.arg(
Arg::with_name("path")
.help("Path to file to dump")
.required(true)
.index(1),
)
.get_matches();
let path = PathBuf::from(arg_matches.value_of("path").unwrap());
dump_layerfile_from_path(&path)?;
Ok(())
}