FBUtilities.hash can result in thread contention on call to
MessageDigest.getInstance()
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Key: CASSANDRA-1369
URL: https://issues.apache.org/jira/browse/CASSANDRA-1369
Project: Cassandra
Issue Type: Improvement
Components: Core
Affects Versions: 0.6.4
Reporter: Jason Fager
Priority: Minor
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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