mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-28 06:59:40 -08:00
b4c7c80227
https://en.wikipedia.org/wiki/Bit_numbering#Least_significant_bit Signed-off-by: Catalin Patulea <catalinp@google.com>
16 lines
1.4 KiB
Markdown
16 lines
1.4 KiB
Markdown
# 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 uint64 composed of in-file offset (lower 4 bytes) and segment sequence number (upper 4 bytes).
|
|
|
|
```
|
|
┌────────────────────────────────────────┬──────────────────────┐
|
|
│ magic(0x85BD40DD) <4 byte> │ version(1) <1 byte> │
|
|
├────────────────────────────────────────┴──────────────────────┤
|
|
│ ┌───────────────┬───────────────────┬──────┬────────────────┐ │
|
|
│ │ len <uvarint> │ encoding <1 byte> │ data │ CRC32 <4 byte> │ │
|
|
│ └───────────────┴───────────────────┴──────┴────────────────┘ │
|
|
└───────────────────────────────────────────────────────────────┘
|
|
```
|