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From "Li Zou (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-6188) The JMX stats for Speculative Retry stops moving during a node failure outage period
Date Fri, 11 Oct 2013 22:26:43 GMT
Li Zou created CASSANDRA-6188:
---------------------------------

             Summary: The JMX stats for Speculative Retry stops moving during a node failure
outage period
                 Key: CASSANDRA-6188
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6188
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: One data center of 4 Cassandra-2.0 nodes with default configuration
parameters deployed on 4 separate machines. A testing app (with either Astyanax or DataStax
client driver) interacts with the Cassandra data center. A traffic generator is sending traffic
to the testing app for testing purpose.
            Reporter: Li Zou


Under normal testing traffic level with default Cassandra Speculative Retry configuration
for each table (i.e. 99 percentile), JConsole shows that the JMX stats for Speculative Retry
increments slowly. However, during the node failure outage period (i.e. immediately after
the node was killed and before the gossip figures out that the node is down), JConsole shows
that the JMX stats for Speculative Retry stops moving. That is, for around 20 seconds, the
JMX stats for Speculative Retry does not move.

This is true for all other Speculative Retry options. 




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