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https://issues.apache.org/jira/browse/MAPREDUCE-1900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907806#action_12907806
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Dan Adkins commented on MAPREDUCE-1900:
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This patch breaks hadoop for me. Can we reconsider it?
It is not safe to call
FileSystem.closeAllForUGI(UserGroupInformation.getCurrentUser());
in order to close one filesystem connection.
See MAPREDUCE-2060
It causes the parent JobTracker's FileSystem object to be closed as well,
making it impossible (for me) to successfully submit a job.
> MapReduce daemons should close FileSystems that are not needed anymore
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-1900
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1900
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker, tasktracker
> Reporter: Devaraj Das
> Assignee: Kan Zhang
> Fix For: 0.22.0
>
> Attachments: fs-close-delta.patch, m1900-04.patch,
> mapred-fs-close.patch
>
>
> Related to HADOOP-6843, this jira is to make MapReduce behave better with
> respect to closing FileSystems when they are not needed anymore.
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