upgrade: reduce replication factor of SQL stats tables#169073
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kyle-a-wong wants to merge 1 commit intocockroachdb:masterfrom
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upgrade: reduce replication factor of SQL stats tables#169073kyle-a-wong wants to merge 1 commit intocockroachdb:masterfrom
kyle-a-wong wants to merge 1 commit intocockroachdb:masterfrom
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Add cluster version V26_3_ReduceSQLStatsReplicationFactor and a tenant upgrade that overrides the zone configuration of system.statement_statistics and system.transaction_statistics to set num_replicas = 3 instead of inheriting the cluster default of 5. The same change is wired into bootstrapCluster so newly-created clusters pick up the reduced replication factor at bootstrap. These tables hold observability data; the loss-tolerance of 3x replication is acceptable, while halving their replication storage footprint and write amplification. Release note (ops change): The system.statement_statistics and system.transaction_statistics tables now use a replication factor of 3 instead of inheriting the cluster default of 5.
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Summary
V26_3_ReduceSQLStatsReplicationFactorand a tenantupgrade that overrides the zone configuration of
system.statement_statisticsandsystem.transaction_statisticsto setnum_replicas = 3instead of inheriting the cluster default of 5.bootstrapClusterso newly-created clusterspick up the reduced replication factor at bootstrap.
replication is acceptable, while halving their replication storage
footprint and write amplification.
Epic: none
Release note (ops change): The
system.statement_statisticsandsystem.transaction_statisticstables now use a replication factor of 3instead of inheriting the cluster default of 5.