CASSANDRA-19661: Dynamically skip sharding L0 when SAI Vector index present #4605
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netudima
reviewed
Feb 10, 2026
| ShardManager shardManager = getShardManager(); | ||
| double flushDensity = cfs.metric.flushSizeOnDisk.get() * shardManager.shardSetCoverage() / shardManager.localSpaceCoverage(); | ||
| ShardTracker boundaries = shardManager.boundaries(controller.getNumShards(flushDensity)); | ||
| boolean supportsSharding = sstableLevel == 0 && indexGroups.stream().allMatch(Index.Group::supportsL0Shards); |
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should it be actually a condition like:
sstableLevel > 0 || indexGroups.stream().allMatch(Index.Group::supportsL0Shards) ?
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This is a draft solution to https://issues.apache.org/jira/browse/CASSANDRA-19661. It works by using a single shard at L0 when a vector index is present.