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Posted to hdfs-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2015/11/03 17:07:28 UTC

[jira] [Updated] (HDFS-9198) Coalesce IBR processing in the NN

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

Daryn Sharp updated HDFS-9198:
------------------------------
    Attachment: HDFS-9198-trunk.patch

updated per comments.  will update branch-2 if this is acceptable.

> 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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