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Date: Wed, 14 May 2008 16:01:55 -0700 (PDT)
From: "Raghu Angadi (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3382) Memory leak when files are not
 cleanly closed
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    [ https://issues.apache.org/jira/browse/HADOOP-3382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596974#action_12596974 ] 

Raghu Angadi commented on HADOOP-3382:
--------------------------------------

TestMiniMRBingUp failes. This is very simple test and does not even use DFS. The failure seems to another case of HADOOP-3354 (thanks Lohit). I think this patch can be committed.

> Memory leak when files are not cleanly closed
> ---------------------------------------------
>
>                 Key: HADOOP-3382
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3382
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>            Priority: Blocker
>             Fix For: 0.17.0
>
>         Attachments: HADOOP-3382.patch, HADOOP-3382.patch, HADOOP-3382.patch, memleak.txt
>
>
> {{FSNamesystem.internalReleaseCreate()}} in invoked on files that are open for writing but not cleanly closed. e.g. when client invokes {{abandonFileInProgress()}} or when lease expires. It deletes the last block if it has a length of zero. The block is deleted from the file INode but not from {{blocksMap}}. Then leaves a reference to such file until NameNode is restarted. When this happens  HADOOP-3381 multiplies amount of memory leak.

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