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https://issues.apache.org/jira/browse/HBASE-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14494185#comment-14494185
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Andrew Purtell commented on HBASE-12116:
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bq. CRC and unsafe compareto at 20% each
Assumed this is with HBase doing its own checksumming. If we know we have
DFSInputStream#read variants that accept BBs (and zero copy read under the
covers), then we could move all reads over to this interface, check if Hadoop's
native CRC (HADOOP-10838) is available to us, and if so run it over the
contents of the BBs we get from HDFS? We'd need 2.6.0 as the floor of Hadoop
support so maybe do this in trunk for 2.0?
> Hot contention spots; writing
> -----------------------------
>
> Key: HBASE-12116
> URL: https://issues.apache.org/jira/browse/HBASE-12116
> Project: HBase
> Issue Type: Bug
> Reporter: stack
> Assignee: stack
> Attachments: 12116.checkForReplicas.txt,
> 12116.stringify.and.cache.scanner.maxsize.txt, 12116.txt, Screen Shot
> 2014-09-29 at 5.12.51 PM.png, Screen Shot 2014-09-30 at 10.39.34 PM.png,
> Screen Shot 2015-04-13 at 2.03.05 PM.png, perf.write3.svg, perf.write4.svg
>
>
> Playing with flight recorder, here are some write-time contentious
> synchronizations/locks (picture coming)
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