Michael Kjellman created CASSANDRA-13291:
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Summary: Replace usages of MessageDigest with Guava's Hasher
Key: CASSANDRA-13291
URL: https://issues.apache.org/jira/browse/CASSANDRA-13291
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Michael Kjellman
Assignee: Michael Kjellman
During my profiling of C* I frequently see lots of aggregate time across
threads being spent inside the MD5 MessageDigest implementation. Given that
there are tons of modern alternative hashing functions better than MD5
available -- both in terms of providing better collision resistance and actual
computational speed -- I wanted to switch out our usage of MD5 for alternatives
(like adler128 or murmur3_128) and test for performance improvements.
Unfortunately, I found given the fact we use MessageDigest everywhere --
switching out the hashing function to something like adler128 or murmur3_128
(for example) -- which don't ship with the JDK -- wasn't straight forward.
The goal of this ticket is to propose switching out usages of MessageDigest
directly in favor of Hasher from Guava. This means going forward we can change
a single line of code to switch the hashing algorithm being used (assuming
there is an implementation in Guava).
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