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Clarify units of --storage.tsdb.retention.size (#10154)

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The flag uses Base2Bytes: 129ed4ec8b/cmd/prometheus/main.go (L1476)

Signed-off-by: Rodrigo Queiro <rodrigoq@google.com>
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Rodrigo Queiro 2022-01-13 00:55:57 +01:00 committed by GitHub
parent 933f50bcda
commit 70c1446a64
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2 changed files with 2 additions and 2 deletions
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2
cmd/prometheus/main.go
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@ -296,7 +296,7 @@ func main() {
serverOnlyFlag(a, "storage.tsdb.retention.time", "How long to retain samples in storage. When this flag is set it overrides \"storage.tsdb.retention\". If neither this flag nor \"storage.tsdb.retention\" nor \"storage.tsdb.retention.size\" is set, the retention time defaults to "+defaultRetentionString+". Units Supported: y, w, d, h, m, s, ms.").
SetValue(&newFlagRetentionDuration)
serverOnlyFlag(a, "storage.tsdb.retention.size", "Maximum number of bytes that can be stored for blocks. A unit is required, supported units: B, KB, MB, GB, TB, PB, EB. Ex: \"512MB\".").
serverOnlyFlag(a, "storage.tsdb.retention.size", "Maximum number of bytes that can be stored for blocks. A unit is required, supported units: B, KB, MB, GB, TB, PB, EB. Ex: \"512MB\". Based on powers-of-2, so 1KB is 1024B.").
BytesVar(&cfg.tsdb.MaxBytes)
serverOnlyFlag(a, "storage.tsdb.no-lockfile", "Do not create lockfile in data directory.").

2
docs/storage.md
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@ -82,7 +82,7 @@ Prometheus has several flags that configure local storage. The most important ar
* `--storage.tsdb.path`: Where Prometheus writes its database. Defaults to `data/`.
* `--storage.tsdb.retention.time`: When to remove old data. Defaults to `15d`. Overrides `storage.tsdb.retention` if this flag is set to anything other than default.
* `--storage.tsdb.retention.size`: The maximum number of bytes of storage blocks to retain. The oldest data will be removed first. Defaults to `0` or disabled. Units supported: B, KB, MB, GB, TB, PB, EB. Ex: "512MB". Only the persistent blocks are deleted to honor this retention although WAL and m-mapped chunks are counted in the total size. So the minimum requirement for the disk is the peak space taken by the `wal` (the WAL and Checkpoint) and `chunks_head` (m-mapped Head chunks) directory combined (peaks every 2 hours).
* `--storage.tsdb.retention.size`: The maximum number of bytes of storage blocks to retain. The oldest data will be removed first. Defaults to `0` or disabled. Units supported: B, KB, MB, GB, TB, PB, EB. Ex: "512MB". Based on powers-of-2, so 1KB is 1024B. Only the persistent blocks are deleted to honor this retention although WAL and m-mapped chunks are counted in the total size. So the minimum requirement for the disk is the peak space taken by the `wal` (the WAL and Checkpoint) and `chunks_head` (m-mapped Head chunks) directory combined (peaks every 2 hours).
* `--storage.tsdb.retention`: Deprecated in favor of `storage.tsdb.retention.time`.
* `--storage.tsdb.wal-compression`: Enables compression of the write-ahead log (WAL). Depending on your data, you can expect the WAL size to be halved with little extra cpu load. This flag was introduced in 2.11.0 and enabled by default in 2.20.0. Note that once enabled, downgrading Prometheus to a version below 2.11.0 will require deleting the WAL.