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From "Vijay (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-3610) Checksum improvement for CompressedRandomAccessReader
Date Sun, 11 Dec 2011 18:26:40 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vijay updated CASSANDRA-3610:
-----------------------------

    Description: 
When compression is on, Currently we see checksum taking up about 40% of the CPU more than
snappy library.
Looks like hadoop solved it by implementing their own checksum, we can either use it or implement
something like that.
http://images.slidesharecdn.com/1toddlipconyanpeichen-cloudera-hadoopandperformance-final-111110132228-phpapp01-slide-15-768.jpg?1321043717

in our test env it provided 50% improvement over native implementation which uses jni to call
the OS.




  was:
When compression is on, Currently we see checksum taking up about 40% of the CPU more than
snappy library.
Looks like hadoop solved it by implementing their own checksum, we can either use it or implement
something like that.
http://goo.gl/Qz2FW3

in our test env it provided 50% improvement over native implementation which uses jni to call
the OS.




    
> Checksum improvement for CompressedRandomAccessReader
> -----------------------------------------------------
>
>                 Key: CASSANDRA-3610
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3610
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.1
>         Environment: JVM
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.1
>
>
> When compression is on, Currently we see checksum taking up about 40% of the CPU more
than snappy library.
> Looks like hadoop solved it by implementing their own checksum, we can either use it
or implement something like that.
> http://images.slidesharecdn.com/1toddlipconyanpeichen-cloudera-hadoopandperformance-final-111110132228-phpapp01-slide-15-768.jpg?1321043717
> in our test env it provided 50% improvement over native implementation which uses jni
to call the OS.

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