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From "Vinay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4504) DFSOutputStream#close doesn't always release resources (such as leases)
Date Mon, 19 Aug 2013 05:39:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13743546#comment-13743546
] 

Vinay commented on HDFS-4504:
-----------------------------

In the latest patch, some unnecessary (Only space) file changes from Mapreduce, tools and
Yarn project got added. I assume these added by mistake. Can you please remove them..
                
> DFSOutputStream#close doesn't always release resources (such as leases)
> -----------------------------------------------------------------------
>
>                 Key: HDFS-4504
>                 URL: https://issues.apache.org/jira/browse/HDFS-4504
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-4504.001.patch, HDFS-4504.002.patch, HDFS-4504.007.patch, HDFS-4504.008.patch,
HDFS-4504.009.patch, HDFS-4504.010.patch, HDFS-4504.011.patch, HDFS-4504.014.patch, HDFS-4504.015.patch
>
>
> {{DFSOutputStream#close}} can throw an {{IOException}} in some cases.  One example is
if there is a pipeline error and then pipeline recovery fails.  Unfortunately, in this case,
some of the resources used by the {{DFSOutputStream}} are leaked.  One particularly important
resource is file leases.
> So it's possible for a long-lived HDFS client, such as Flume, to write many blocks to
a file, but then fail to close it.  Unfortunately, the {{LeaseRenewerThread}} inside the client
will continue to renew the lease for the "undead" file.  Future attempts to close the file
will just rethrow the previous exception, and no progress can be made by the client.

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