make CFS.flushWriter_ size configurable
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Key: CASSANDRA-1099
URL: https://issues.apache.org/jira/browse/CASSANDRA-1099
Project: Cassandra
Issue Type: New Feature
Components: Core
Reporter: Jonathan Ellis
Priority: Minor
Fix For: 0.7
For small heaps (including our out-of-the-box 1G) we want to allow reducing
this from the automatic (1 + 2 *
DatabaseDescriptor.getAllDataFileLocations().length); having 3 memtables in the
queue, plus another being written, is over 200MB which is a significant amount
of data for the GC to chew through (see CASSANDRA-1014).
For large heaps, we might also want to allow *increasing* this value, to
accommodate load spikes better.
Unfortunately making this configurable at runtime does not appear to be an
option due to the lack of a setCapacity method on any of the BlockingQueue
classes.
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