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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9198) Coalesce IBR processing in the NN
Date Fri, 29 Jan 2016 10:00:48 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Vinayakumar B updated HDFS-9198:
    Attachment: HDFS-9198-branch-2.7.patch

Here is the branch-2.7 patch, resolved some conflicts and compilation errors.

> Coalesce IBR processing in the NN
> ---------------------------------
>                 Key: HDFS-9198
>                 URL: https://issues.apache.org/jira/browse/HDFS-9198
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>             Fix For: 2.8.0
>         Attachments: HDFS-9198-Branch-2-withamend.diff, HDFS-9198-Branch-2.8-withamend.diff,
HDFS-9198-branch-2.7.patch, HDFS-9198-branch2.patch, HDFS-9198-trunk.patch, HDFS-9198-trunk.patch,
HDFS-9198-trunk.patch, HDFS-9198-trunk.patch, HDFS-9198-trunk.patch
> IBRs from thousands of DNs under load will degrade NN performance due to excessive write-lock
contention from multiple IPC handler threads.  The IBR processing is quick, so the lock contention
may be reduced by coalescing multiple IBRs into a single write-lock transaction.  The handlers
will also be freed up faster for other operations.

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