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https://issues.apache.org/jira/browse/HBASE-6116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400185#comment-13400185
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Andrew Purtell commented on HBASE-6116:
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In my experience there is little difference in variability run to run on the
same instances as opposed to two parallel runs started around the same time.
EC2 is not a great platform for this kind of testing so it should be run on
real hardware to see if the results are replicated there. Or I could try the so
called cluster compute instances. They are expensive but given the result
confirming it with those could be justified
> Allow parallel HDFS writes for HLogs.
> -------------------------------------
>
> Key: HBASE-6116
> URL: https://issues.apache.org/jira/browse/HBASE-6116
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Attachments: 6116-v1.txt, pipelined-vs-parallel-comparison.zip
>
>
> In HDFS-1783 I adapted Dhrubas changes to be used in Hadoop trunk.
> This issue will include the necessary reflection changes to optionally enable
> this for the WALs in HBase.
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