Memtable Flush writers doesn't actually flush in parallel
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                 Key: CASSANDRA-2178
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2178
             Project: Cassandra
          Issue Type: Bug
            Reporter: Chris Goffinet
            Assignee: Chris Goffinet
            Priority: Minor


The flushWriter JMXEnabledThreadPoolExecutor sets the core pool min to 1, and 
sets the LBQ to DatabaseDescriptor.getFlushWriters(). Increasing 
memtable_flush_writers should allow us to flush more in parallel. The pool will 
not grow until LBQ fills up to DatabaseDescriptor.getFlushWriters(). 

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