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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9198) Coalesce IBR processing in the NN
Date Tue, 15 Dec 2015 15:37:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15058216#comment-15058216
] 

Daryn Sharp commented on HDFS-9198:
-----------------------------------

Comments?  Been running successfully with this feature since early Nov.  Will update patch
if necessary if it's currently acceptable.  Seem to recall test failures were general build
instability.

> 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, 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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