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From "vincent royer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13271) Reduce lock contention on instance factories of ListType and SetType
Date Sun, 26 Feb 2017 07:59:44 GMT
vincent royer created CASSANDRA-13271:
-----------------------------------------

             Summary: Reduce lock contention on instance factories of ListType and SetType
                 Key: CASSANDRA-13271
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13271
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: vincent royer
            Priority: Minor
             Fix For: 3.0.x, 3.11.x


By doing some performance tests, i notice that getInstance() in org.apache.cassandra.db.marshal.ListType
and SetType could suffer from lock contention on the singleton factory pattern. Here is a
proposal to reduce lock contention by using a ConcurrentMap and the putIfAbsent method.



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