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https://issues.apache.org/jira/browse/HBASE-6116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404563#comment-13404563
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Lars Hofhansl commented on HBASE-6116:
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Yeah... I'll add a bit more diagnostics logging to make 100% sure as this
definitely surprised me.
The length (latency) of the pipe from the client to the RS is long (at least in
my test) as compared to the length of pipes between the RSs and the DNs.
Also the writing of the blocks is already interleaving with writing to the OS
buffers, so the pipeline might not have had as much as an effect as expected.
I'll also test together with durable sync, as this could show a different
pattern.
> 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, apurtell-patches.zip,
> 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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