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From "Sam Tunnicliffe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13291) Replace usages of MessageDigest with Guava's Hasher
Date Tue, 24 Oct 2017 09:56:03 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16216632#comment-16216632
] 

Sam Tunnicliffe commented on CASSANDRA-13291:
---------------------------------------------

[~mkjellman] thanks for that, I think it was definitely worth clarifying that this is really
all about the server to server stuff and that anything concerning client comms is out of scope.
Thanks for fixing {{computeResultMetadataId}}, I don't feel super-strongly about {{GuidGenerator}}
so with that I'm +1 on the changes.
Thanks again!


> 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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