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From "Lior Golan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5862) Switch to adler checksum for sstables
Date Thu, 08 Aug 2013 18:33:48 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13733814#comment-13733814
] 

Lior Golan commented on CASSANDRA-5862:
---------------------------------------

What's the typical size of a compressed chunk (after compression)? If it's above a few 100
bytes then Adler should be ok. In addition, compressed data has higher entropy which improves
the quality of the adler32 checksum
                
> Switch to adler checksum for sstables
> -------------------------------------
>
>                 Key: CASSANDRA-5862
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5862
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: T Jake Luciani
>             Fix For: 2.0.1
>
>
> Adler is significantly faster than CRC32: http://java-performance.info/java-crc32-and-adler32/
> (Adler is weaker for short inputs, so we should leave the commitlog alone, as it checksums
each mutation individually.)

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