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From "vincent royer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-13271) Reduce lock contention on instance factories of ListType and SetType
Date Sun, 26 Feb 2017 09:36:46 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-13271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

vincent royer updated CASSANDRA-13271:
--------------------------------------
    Description: 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.  (was: 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 getInstance(). Here is a proposal to reduce lock contention by using
a ConcurrentMap and the putIfAbsent method rather than a synchronized method.)

> 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: 3.0.x, 3.11.x
>
>         Attachments: 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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