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Update wal.md that the first wal entry includes only base id and timestamp without a value (#562)

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Signed-off-by: naivewong <867245430@qq.com>
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naivewong 2019-03-21 17:21:50 +08:00 committed by Krasi Georgiev
parent 837ae9aaa0
commit 1c392d0057
1 changed files with 5 additions and 3 deletions
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docs/format/wal.md
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@ -54,14 +54,16 @@ Series records encode the labels that identifies a series and its unique ID.
Sample records encode samples as a list of triples `(series_id, timestamp, value)`. Sample records encode samples as a list of triples `(series_id, timestamp, value)`.
Series reference and timestamp are encoded as deltas w.r.t the first sample. Series reference and timestamp are encoded as deltas w.r.t the first sample.
The first row stores the starting id and the starting timestamp.
The first sample record begins at the second row.
``` ```
┌──────────────────────────────────────────────────────────────────┐ ┌──────────────────────────────────────────────────────────────────┐
│ type = 2 <1b> │ │ type = 2 <1b> │
├──────────────────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────────────────┤
│ ┌────────────────────┬───────────────────────────┬─────────────┐ │ │ ┌────────────────────┬───────────────────────────┐ │
│ │ id <8b> │ timestamp <8b> │ value <8b> │ │ │ │ id <8b> │ timestamp <8b> │ │
│ └────────────────────┴───────────────────────────┴─────────────┘ │ │ └────────────────────┴───────────────────────────┘ │
│ ┌────────────────────┬───────────────────────────┬─────────────┐ │ │ ┌────────────────────┬───────────────────────────┬─────────────┐ │
│ │ id_delta <uvarint> │ timestamp_delta <uvarint> │ value <8b> │ │ │ │ id_delta <uvarint> │ timestamp_delta <uvarint> │ value <8b> │ │
│ └────────────────────┴───────────────────────────┴─────────────┘ │ │ └────────────────────┴───────────────────────────┴─────────────┘ │