fix(tsm1): "snapshot in progress" error during backup #19869
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When an InfluxDB database is very busy writing new points the backup the process can fail because it can not write a new snapshot. The error is: operation timed out with error: create snapshot: snapshot in progress. This happens because InfluxDB takes almost "continuously" a snapshot from the cache caused by the high number of points ingested. The fix for this was #16627 but it was for OSS only, and was not in the code path for backups in clusters. This fix adds a skipCacheOk flag to tsdb.Engine.CreateSnapshot(). A value of true allows the backup to proceed even if a cache snapshot cannot be taken. This flag is set to true in tsm1.Engine.Backup(), the OSS backup code path and in tsdb.Shard.CreateSnapshot(), the cluster backup code path. This flag is set to false in tsm1.Engine.Export() influxdata/plutonium#3227
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ayang64
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Oct 30, 2020
dgnorton
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Oct 30, 2020
This fix adds a skipCacheOk flag to tsdb.Store.CreateShardSnapshot() and tsdb.Shard.CreateSnapshot() to pass to tsdb.Engine.CreateSnapshot() A value of true allows the backup to proceed even if a cache snapshot cannot be taken. This flag is set to true in tsm1.Engine.Backup(), the OSS backup code path This flag is set to false in tsm1.Engine.Export() influxdata/plutonium#3227
Test the skipCacheOk flag to tsdb.Shard.CreateSnapshot() and tsdb.Engine.CreateSnapshot() A value of true allows the backup to proceed even if a cache snapshot cannot be taken. influxdata/plutonium#3227
This was referenced Jan 15, 2021
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When an InfluxDB database is very busy writing new points the backup the process can fail because it can not write a new snapshot. The error is: operation timed out with error: create snapshot: snapshot in progress.This happens because InfluxDB takes almost "continuously" a snapshot from the cache caused by the high number of points ingested.
The fix for this was #16627 but it was for OSS only, and was not in the code path for backups in clusters.
This fix adds a
skipCacheOkflag totsdb.Engine.CreateSnapshot().A value of
trueallows the backup to proceed even if a cache snapshotcannot be taken.
This flag is set to
trueintsm1.Engine.Backup(), the OSS backup code pathand in
tsdb.Shard.CreateSnapshot(), the cluster backup code path.This flag is set to
falseintsm1.Engine.Export()