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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9198) Coalesce IBR processing in the NN
Date Thu, 15 Oct 2015 19:12:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959448#comment-14959448

Daryn Sharp commented on HDFS-9198:

Most of the test failures are a race condition from IBRs not be sync now.  Will update shortly.
 All you watchers, any comments on the approach?

> 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
>         Attachments: HDFS-9198-branch2.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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