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From "Jon Haddad (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13271) Reduce lock contention on instance factories of ListType and SetType
Date Thu, 02 Mar 2017 17:44:45 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15892669#comment-15892669
] 

Jon Haddad commented on CASSANDRA-13271:
----------------------------------------

Are there any performance tests that show the effect of this patch?  

> 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
>              Labels: performance
>             Fix For: 4.x
>
>         Attachments: 0001-CASSANDRA-13271-computeIfAbsent.patch, 0001-CASSANDRA-13271-singleton-factory-concurrency-opimiz.patch
>
>
> By doing some performance tests, i noticed that getInstance() in org.apache.cassandra.db.marshal.ListType
and SetType could suffer from lock contention on the singleton factory getInstance(). Here
is a proposal to reduce lock contention by using a ConcurrentMap and the putIfAbsent method
rather than a synchronized method.



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