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From "Michael Kjellman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13291) Replace usages of MessageDigest with Guava's Hasher
Date Mon, 20 Mar 2017 21:08:41 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15933567#comment-15933567
] 

Michael Kjellman commented on CASSANDRA-13291:
----------------------------------------------

[~snazy] sorry for the delay replying. I never got an email... seems like the JIRA watch feature
+ email is a bit flaky.

I know we don't have that method in trunk anymore, but we'll need something similar to it
to upgrade to a different hashing algo off of MD5... A new class sounds like a reasonable
solution. Let me do that now.

Other things comments sound good too. Let me address those now too.

> 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
>         Attachments: CASSANDRA-13291-trunk.diff
>
>
> 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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