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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5394) fix race conditions in DN caching and uncaching
Date Mon, 21 Oct 2013 20:25:42 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-5394:
---------------------------------------

    Attachment: HDFS-5394-caching.003.patch

rebase after recent patches hit

> 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: HDFS-4949
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-5394-caching.001.patch, HDFS-5394-caching.002.patch, HDFS-5394-caching.003.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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