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https://issues.apache.org/jira/browse/CASSANDRA-5371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13621414#comment-13621414
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Jonathan Ellis commented on CASSANDRA-5371:
-------------------------------------------
Alternate implementation pushed to
http://github.com/jbellis/cassandra/commits/5371 with the following
improvements:
- Only applies STCS to L0 if L0 gets behind (defined as "accumulates more than
MAX_COMPACTING_L0 sstables")
- Performs true STCS, rather than "compact in sets of four and then never again"
> Perform size-tiered compactions in L0
> -------------------------------------
>
> Key: CASSANDRA-5371
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5371
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: T Jake Luciani
> Fix For: 2.0
>
> Attachments: HybridCompactionStrategy.java
>
>
> If LCS gets behind, read performance deteriorates as we have to check bloom
> filters on man sstables in L0. For wide rows, this can mean having to seek
> for each one since the BF doesn't help us reject much.
> Performing size-tiered compaction in L0 will mitigate this until we can catch
> up on merging it into higher levels.
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