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prometheus/Documentation/format/tombstones.md
Goutham Veeramachaneni 44e9ae38b5
Incorporate PR feedback. 
* Expose Stone as it is used in an exported method.
* Move from tombstoneReader to []Stone for the same reason as above.
* Make WAL reading a little cleaner.

Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>
2017-05-26 21:26:31 +05:30

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Tombstones Disk Format

The following describes the format of a tombstones file, which is placed at the top level directory of a block.

The last 8 bytes specifies the offset to the start of Stones section. The stones section is 0 padded to a multiple of 4 for fast scans.

┌────────────────────────────┬─────────────────────┐
│ magic(0x130BA30) <4b>      │ version(1) <1 byte> │
├────────────────────────────┴─────────────────────┤
│ ┌──────────────────────────────────────────────┐ │
│ │                Tombstone 1                   │ │
│ ├──────────────────────────────────────────────┤ │
│ │                      ...                     │ │
│ ├──────────────────────────────────────────────┤ │
│ │                Tombstone N                   │ │
│ ├──────────────────────────────────────────────┤ │
│ │                  CRC<4b>                     │ │
│ └──────────────────────────────────────────────┘ │
└──────────────────────────────────────────────────┘

Tombstone

┌─────────────┬───────────────┬──────────────┐
│ref <varint> │ mint <varint> │ maxt <varint>│
└─────────────┴───────────────┴──────────────┘