Ariel Weisberg created CASSANDRA-12358:
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Summary: 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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