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https://issues.apache.org/jira/browse/CASSANDRA-5344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616974#comment-13616974
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Jonathan Ellis commented on CASSANDRA-5344:
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I think we can just make SSTW.append return null to signify that nothing was
written. I'll give that a try.
> Make LCR less memory-abusive
> ----------------------------
>
> Key: CASSANDRA-5344
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5344
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Priority: Minor
>
> We've seen several reports of compaction causing GC pauses. You would think
> this would be the fault of PCR (which materializes the rows in memory) but
> LCR seems to be more of a problem.
> I hypothesize that PCR mostly generates just young-gen garbage, but since LCR
> keeps the BF and row index in-memory for a long time (from construction,
> until after the row has been merged and written), it gets tenured and can
> cause fragmentation or promotion failures.
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