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From "vincent royer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13271) Reduce lock contention on instance factories of ListType and SetType
Date Wed, 01 Mar 2017 19:29:45 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890871#comment-15890871
] 

vincent royer commented on CASSANDRA-13271:
-------------------------------------------

Sorry, here is 3.11 trunk + patch, including  DynamicCompositeType : https://github.com/strapdata/cassandra-3.11-13271
import java.util.* has been replaced by only-used imports (Eclipse organize imports).

> 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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