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From "Aaron Whiteside (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9328) WriteTimeoutException thrown when LWT concurrency > 1, despite the query duration taking MUCH less than cas_contention_timeout_in_ms
Date Thu, 07 May 2015 22:11:00 GMT
Aaron Whiteside created CASSANDRA-9328:
------------------------------------------

             Summary: WriteTimeoutException thrown when LWT concurrency > 1, despite the
query duration taking MUCH less than cas_contention_timeout_in_ms
                 Key: CASSANDRA-9328
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9328
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Aaron Whiteside
            Priority: Critical
         Attachments: CassandraLWTTest.java

WriteTimeoutException thrown when LWT concurrency > 1, despite the query duration taking
MUCH less than cas_contention_timeout_in_ms.

Unit test attached, run against a 3 node cluster running 2.1.5.

If you reduce the threadCount to 1, you never see a WriteTimeoutException. If the WTE is due
to not being able to communicate with other nodes, why does the concurrency >1 cause inter-node
communication to fail?



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