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lib/logstorage: make sure that the number of output (bloom, values) shards is bigger than zero.

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If the number of output (bloom, values) shards is zero, then this may lead to panic
as shown at https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7391 .

This panic may happen when parts with only constant fields with distinct values are merged into
output part with non-constant fields, which should be written to (bloom, values) shards.

(cherry picked from commit 102e9d4f4e)
This commit is contained in:
Aliaksandr Valialkin 2024-10-30 13:37:27 +01:00 committed by hagen1778
parent fd044a4ce0
commit bf243df9ce
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2 changed files with 6 additions and 1 deletions
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2
docs/VictoriaLogs/CHANGELOG.md
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@ -15,6 +15,8 @@ according to [these docs](https://docs.victoriametrics.com/victorialogs/quicksta
## tip
* BUGFIX: fix `runtime error: index out of range [0] with length 0` panic during low-rate data ingestion. The panic has been introduced in [v0.38.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v0.38.0-victorialogs). See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7391).
## [v0.38.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v0.38.0-victorialogs)
Released at 2024-10-29

5
lib/logstorage/block_stream_writer.go
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@ -312,7 +312,10 @@ func (bsw *blockStreamWriter) MustInitForFilePart(path string, nocache bool, blo
func adjustBloomValuesShardsCount(n uint64) uint64 {
if n == 0 {
return n
// At least a single shard is needed for writing potential non-const fields,
// which can appear after merging of const fields.
// This fixes https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7391
return 1
}
n = 1 << bits.Len64(n-1)