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https://issues.apache.org/jira/browse/CASSANDRA-12358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412576#comment-15412576
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Ariel Weisberg commented on CASSANDRA-12358:
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Double blue! Hats off to the C* team that is awesome.
> Slow PostFlush execution due to 2i flushing can cause near OOM to OOM
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-12358
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12358
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Ariel Weisberg
> Assignee: Ariel Weisberg
> Fix For: 3.10
>
>
> 2i can be slow to flush for a variety of reasons. Potentially slower than the
> rate at which Memtables can ingest and flush data. If this occurs the heap
> fills up with Memtables that are waiting for PostFlush to run.
> This occurs because reclaiming the memory is done before PostFlush runs.
> I will post a branch that has the reclaim memory task run after PostFlush has
> completed. As far as I can tell this is safe and correct since the memory is
> committed up until that point.
> It's not clear to me if PostFlush has to bind the Memtables or not. I suspect
> it does, but I'm not sure if that is a route I should go down.
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