prometheus/Documentation/format/chunks.md

16 lines
1.4 KiB
Markdown
Raw Normal View History

2017-04-24 01:33:08 -07:00
# Chunks Disk Format
The following describes the format of a single chunks file, which is created in the `chunks/` directory of a block. The maximum size per segment file is 512MiB.
Chunks in the files are referenced from the index by the in-file offset in the 4 LSB and the segment sequence number in the bigher 4 MSBs.
2017-04-24 01:33:08 -07:00
```
┌────────────────────────────────────────┬──────────────────────┐
│ magic(0x85BD40DD) <4 byte> │ version(1) <1 byte>
├────────────────────────────────────────┴──────────────────────┤
│ ┌───────────────┬───────────────────┬──────┬────────────────┐ │
│ │ len <uvarint> │ encoding <1 byte> │ data │ CRC32 <4 byte> │ │
│ └───────────────┴───────────────────┴──────┴────────────────┘ │
└───────────────────────────────────────────────────────────────┘
2017-04-24 01:33:08 -07:00
```