Improve default window size for DES
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Key: CASSANDRA-2109
URL: https://issues.apache.org/jira/browse/CASSANDRA-2109
Project: Cassandra
Issue Type: Improvement
Reporter: Stu Hood
Priority: Minor
Fix For: 0.8
The window size for DES is currently hardcoded at 100 requests. A larger window
means that it takes longer to react to a suddenly slow node, but that you have
a smoother transition for scores.
An example of bad behaviour: with a window of size 100, we saw a case with a
failing node where if enough requests could be answered quickly out of cache or
bloomfilters, the window might be momentarily filled with 10 ms requests,
pushing out requests that had to go disk and took 10 seconds.
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