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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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2
postgres_ffi/src/pg_constants.rs
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@@ -87,6 +87,8 @@ pub const XACT_XINFO_HAS_TWOPHASE: u32 = 1u32 << 4;
pub const XLOG_NEXTOID: u8 = 0x30;
pub const XLOG_SWITCH: u8 = 0x40;
pub const XLOG_SMGR_TRUNCATE: u8 = 0x20;
pub const XLOG_FPI_FOR_HINT: u8 = 0xA0;
pub const XLOG_FPI: u8 = 0xB0;
pub const DB_SHUTDOWNED: u32 = 1;
// From multixact.h