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https://issues.apache.org/jira/browse/CASSANDRA-5936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcus Eriksson updated CASSANDRA-5936:
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Labels: compaction (was: )
> Improve the way we pick L0 compaction candidates
> ------------------------------------------------
>
> Key: CASSANDRA-5936
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5936
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Labels: compaction
> Fix For: 2.1 beta2
>
>
> We could improve the way we pick compaction candidates in level 0 in LCS.
> The most common way for us to get behind on compaction is after repairs, we
> should exploit the fact that the streamed sstables are most often very narrow
> in range since the other nodes in the ring will have a similar
> sstable-range-distribution. We should in theory be able to do 10 concurrent
> compactions involving L1 - ie, partition L0 in buckets defined by the
> sstables in L1 to only keep one L1 SSTable busy for every compaction (be it
> L1 to L2 or L0 to L1).
> we will need some heuristics on when to select candidates from the buckets
> and when to do it the old way (since L0 sstables can span several L1 sstables)
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