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https://issues.apache.org/jira/browse/HBASE-11927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14540840#comment-14540840
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stack commented on HBASE-11927:
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Definetly a different profile.
For the 'without' I see hdfs checksum on write taking 4.58% but for the 'with'
native, it takes 8.14%.
Writing the hfiles, I see 'without' taking 8.17% and with native, taking 6.59%.
Reading, without takes 15.59% CPU and with native, it takes 7.39%.
What configs did you run with? Did you enable crc32c?
Patch looks good [~appy]
> Use Native Hadoop Library for HFile checksum
> --------------------------------------------
>
> Key: HBASE-11927
> URL: https://issues.apache.org/jira/browse/HBASE-11927
> Project: HBase
> Issue Type: Bug
> Reporter: stack
> Assignee: Apekshit Sharma
> Attachments: HBASE-11927-v1.patch, HBASE-11927.patch, c2021.crc2.svg,
> c2021.write.2.svg, c2021.zip.svg, compact-with-native.svg,
> compact-without-native.svg, crc32ct.svg
>
>
> Up in hadoop they have this change. Let me publish some graphs to show that
> it makes a difference (CRC is a massive amount of our CPU usage in my
> profiling of an upload because of compacting, flushing, etc.). We should
> also make use of native CRCings -- especially the 2.6 HDFS-6865 and ilk -- in
> hbase but that is another issue for now.
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