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Sylvain Lebresne commented on CASSANDRA-3610:
---------------------------------------------
The patch lgtm, but pulling hadoop-commons for just that feels a bit too much
imo. I'd prefer extracting the code from there (The initial patch were they
added their optimized CRC32 was HADOOP-6148).
> 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
>
> Attachments: 0001-use-pure-java-CRC32.patch
>
>
> 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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