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https://issues.apache.org/jira/browse/CASSANDRA-5371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881634#comment-13881634
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Ravi Prasad commented on CASSANDRA-5371:
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+1 on [~br1985 ] comment.
Even during dead node replace (using replace_address), streaming puts all
sstables in L0. 2.0.x switches to STCS, in doing so, also creates larger
sstables, which means more free disk space to be left, in order for them to be
compacted later into higher levels. LCS is known to lower the amount of free
disk space (headroom) needed for compaction. this is no more true with LCS in
above scenarios.
Is there a way to disable STCS fallback, please?
> Perform size-tiered compactions in L0 ("hybrid compaction")
> -----------------------------------------------------------
>
> Key: CASSANDRA-5371
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5371
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 2.0 beta 1
>
> 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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