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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6116) Allow parallel HDFS writes for HLogs.
Date Sun, 24 Jun 2012 19:00:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400195#comment-13400195
] 

Lars Hofhansl commented on HBASE-6116:
--------------------------------------

Again thanks for doing this Andy.
Looks like the latency is indeed reduced greatly, by around 30% - judged by the mean.

The slower instances now hover around 8ms as opposed to 12ms before, and the other instances
around 6ms as opposed to 8ms.

I'm still trying to interpret the 90th percentile numbers.
                
> 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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