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From "Stu Hood (JIRA)" <>
Subject [jira] Created: (CASSANDRA-2109) Improve default window size for DES
Date Fri, 04 Feb 2011 05:30:22 GMT
Improve default window size for DES

                 Key: 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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