Kiu/VictoriaMetrics
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docs: mention checksums and data corruption (#4404)

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Signed-off-by: hagen1778 <roman@victoriametrics.com>
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Roman Khavronenko 2023-06-06 10:54:39 +02:00 committed by GitHub
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10
README.md
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@ -1544,7 +1544,13 @@ occurs in the middle of writing the `part` to disk - such incompletely written `
are automatically deleted on the next VictoriaMetrics start. are automatically deleted on the next VictoriaMetrics start.
The same applies to merge process — `parts` are either fully merged into a new `part` or fail to merge, The same applies to merge process — `parts` are either fully merged into a new `part` or fail to merge,
leaving the source `parts` untouched. leaving the source `parts` untouched. However, due to hardware issues data on disk may be corrupted regardless of
VictoriaMetrics process. VictoriaMetrics can detect corruption during decompressing, decoding or sanity checking
of the data blocks. But **it cannot fix the corrupted data**. Data parts that fail to load on startup need to be deleted
or restored from backups. This is why it is recommended performing
[regular backups](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#backups).
VictoriaMetrics doesn't use checksums for stored data blocks. See why [here](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3011).
VictoriaMetrics doesn't merge parts if their summary size exceeds free disk space. VictoriaMetrics doesn't merge parts if their summary size exceeds free disk space.
This prevents from potential out of disk space errors during merge. This prevents from potential out of disk space errors during merge.
@ -2501,7 +2507,7 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
-search.maxGraphiteTagKeys int -search.maxGraphiteTagKeys int
The maximum number of tag keys returned from Graphite /tags, /tags/autoComplete/*, /tags/findSeries API (default 100000) The maximum number of tag keys returned from Graphite /tags, /tags/autoComplete/*, /tags/findSeries API (default 100000)
-search.maxGraphiteTagValues int -search.maxGraphiteTagValues int
The maximum number of tag values returned Graphite /tags/<tag_name> API (default 100000) The maximum number of tag values returned Graphite /tags/<tag_name> API (default 100000)
-search.maxLookback duration -search.maxLookback duration
Synonym to -search.lookback-delta from Prometheus. The value is dynamically detected from interval between time series datapoints if not set. It can be overridden on per-query basis via max_lookback arg. See also '-search.maxStalenessInterval' flag, which has the same meaning due to historical reasons Synonym to -search.lookback-delta from Prometheus. The value is dynamically detected from interval between time series datapoints if not set. It can be overridden on per-query basis via max_lookback arg. See also '-search.maxStalenessInterval' flag, which has the same meaning due to historical reasons
-search.maxMemoryPerQuery size -search.maxMemoryPerQuery size

8
docs/README.md
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@ -1547,7 +1547,13 @@ occurs in the middle of writing the `part` to disk - such incompletely written `
are automatically deleted on the next VictoriaMetrics start. are automatically deleted on the next VictoriaMetrics start.
The same applies to merge process — `parts` are either fully merged into a new `part` or fail to merge, The same applies to merge process — `parts` are either fully merged into a new `part` or fail to merge,
leaving the source `parts` untouched. leaving the source `parts` untouched. However, due to hardware issues data on disk may be corrupted regardless of
VictoriaMetrics process. VictoriaMetrics can detect corruption during decompressing, decoding or sanity checking
of the data blocks. But **it cannot fix the corrupted data**. Data parts that fail to load on startup need to be deleted
or restored from backups. This is why it is recommended performing
[regular backups](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#backups).
VictoriaMetrics doesn't use checksums for stored data blocks. See why [here](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3011).
VictoriaMetrics doesn't merge parts if their summary size exceeds free disk space. VictoriaMetrics doesn't merge parts if their summary size exceeds free disk space.
This prevents from potential out of disk space errors during merge. This prevents from potential out of disk space errors during merge.

8
docs/Single-server-VictoriaMetrics.md
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@ -1555,7 +1555,13 @@ occurs in the middle of writing the `part` to disk - such incompletely written `
are automatically deleted on the next VictoriaMetrics start. are automatically deleted on the next VictoriaMetrics start.
The same applies to merge process — `parts` are either fully merged into a new `part` or fail to merge, The same applies to merge process — `parts` are either fully merged into a new `part` or fail to merge,
leaving the source `parts` untouched. leaving the source `parts` untouched. However, due to hardware issues data on disk may be corrupted regardless of
VictoriaMetrics process. VictoriaMetrics can detect corruption during decompressing, decoding or sanity checking
of the data blocks. But **it cannot fix the corrupted data**. Data parts that fail to load on startup need to be deleted
or restored from backups. This is why it is recommended performing
[regular backups](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#backups).
VictoriaMetrics doesn't use checksums for stored data blocks. See why [here](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3011).
VictoriaMetrics doesn't merge parts if their summary size exceeds free disk space. VictoriaMetrics doesn't merge parts if their summary size exceeds free disk space.
This prevents from potential out of disk space errors during merge. This prevents from potential out of disk space errors during merge.