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prometheus/Documentation/format/chunks.md
Fabian Reinartz d8b91b969c docs: add chunk file format
2017-04-30 10:10:18 +02:00

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Chunks Disk Format

The following describes the format of a single chunks file, which is created in the chunks/ directory of a block.

 ┌────────────────────────────┬──────────────────┐
 │ magic(0x85BD40DD) <4 byte> | version <1 byte> │
 ├────────────────────────────┴──────────────────┤
 │                     Body ...                  │
 └───────────────────────────────────────────────┘

Available versions:

  • v1 (1)

Body (v1)

The body contains a sequence of chunks, each of which has the following format.

┌─────────────────────────────────────────────────────────┐
│ ┌──────────────┬───────────────────┬────────────┐       │
│ │ len <varint> | encoding <1 byte> │    data    │  ...  │
│ └──────────────┴───────────────────┴────────────┘       │
└─────────────────────────────────────────────────────────┘

The length marks the length of the encoding byte and data combined. The CRC checksum is calculated over the encoding byte and data.