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Jon Haddad commented on CASSANDRA-13271:
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Am I missing something here? Did we really just commit an optimization without
any benchmarks?
> Reduce lock contention for collection types and serializers
> -----------------------------------------------------------
>
> 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: 4.0
>
> 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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