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https://issues.apache.org/jira/browse/CASSANDRA-1369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975654#action_12975654
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Hudson commented on CASSANDRA-1369:
-----------------------------------
Integrated in Cassandra-0.7 #126 (See
[https://hudson.apache.org/hudson/job/Cassandra-0.7/126/])
Avoid thread contention in FBUtilities.hash
Patch by brandonwilliams and jbellis, reviewed by brandonwilliams for
CASSANDRA-1369
> FBUtilities.hash can result in thread contention on call to
> MessageDigest.getInstance()
> ---------------------------------------------------------------------------------------
>
> Key: CASSANDRA-1369
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1369
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jason Fager
> Assignee: Brandon Williams
> Priority: Minor
> Fix For: 0.7.1
>
> Attachments: 1369-v2.txt, 1369.txt
>
>
> FBUtilities.hash() calls MessageDigest.getInstance() on every invocation,
> which in turns calls the synchronized method Provider.getService().
> FBUtilities.md5hash() is frequently invoked from RandomPartitioner, and minor
> thread contention in this codepath can be observed when running
> contrib/py_stress against an out-of-box Cassandra installation.
> One possible solution is to preallocate md5 MessageDigest instances and store
> them as threadlocals.
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