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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5394) fix race conditions in DN caching and uncaching
Date Mon, 04 Nov 2013 18:26:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13813078#comment-13813078
] 

Colin Patrick McCabe commented on HDFS-5394:
--------------------------------------------

* fix findbugs warning

* in unit test, be more careful about waiting for munlocks to happen.  Add more debug printouts
on failure.

> fix race conditions in DN caching and uncaching
> -----------------------------------------------
>
>                 Key: HDFS-5394
>                 URL: https://issues.apache.org/jira/browse/HDFS-5394
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>    Affects Versions: 3.0.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-5394-caching.001.patch, HDFS-5394-caching.002.patch, HDFS-5394-caching.003.patch,
HDFS-5394-caching.004.patch, HDFS-5394.005.patch
>
>
> The DN needs to handle situations where it is asked to cache the same replica more than
once.  (Currently, it can actually do two mmaps and mlocks.)  It also needs to handle the
situation where caching a replica is cancelled before said caching completes.



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