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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10817) Add Logging for Long-held NN Read Locks
Date Wed, 31 Aug 2016 22:54:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15453636#comment-15453636
] 

Zhe Zhang commented on HDFS-10817:
----------------------------------

BTW backporting to lower branches hit this issue: http://stackoverflow.com/questions/28408109/java-stopped-erroring-on-non-final-variables-in-inner-classes-java-8

I changed some variables to final in lower branches.

> Add Logging for Long-held NN Read Locks
> ---------------------------------------
>
>                 Key: HDFS-10817
>                 URL: https://issues.apache.org/jira/browse/HDFS-10817
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: logging, namenode
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>         Attachments: HDFS-10817.000.patch, HDFS-10817.001.patch, HDFS-10817.002.patch,
HDFS-10817.003.patch, HDFS-10817.004.patch
>
>
> Right now the Namenode will log when a write lock is held for a long time to help tracks
methods which are causing expensive delays. Let's do the same for read locks since these operations
may also be expensive/long and cause delays. 



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