Patrick McFadin created CASSANDRA-6357:
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Summary: Flush memtables to seperate directory
Key: CASSANDRA-6357
URL: https://issues.apache.org/jira/browse/CASSANDRA-6357
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Patrick McFadin
Flush writers are a critical element for keeping a node healthy. When several
compactions run on systems with low performing data directories, IO becomes a
premium. Once the disk subsystem is saturated, write IO is blocked which will
cause flush writer threads to backup. Since memtables are large blocks of
memory in the JVM, too much blocking can cause excessive GC over time degrading
performance. In the worst case causing an OOM.
Since compaction is running on the data directories. My proposal is to create a
separate directory for flushing memtables. Potentially we can use the same
methodology of keeping the commit log separate and minimize disk contention
against the critical function of the flushwriter.
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