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https://issues.apache.org/jira/browse/HADOOP-9993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776013#comment-13776013
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Chris Nauroth commented on HADOOP-9993:
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See this comment:
https://issues.apache.org/jira/browse/MAPREDUCE-5508?focusedCommentId=13774702&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13774702
> FileSystem#close JavaDoc should state that the implementation must be
> idempotent.
> ---------------------------------------------------------------------------------
>
> Key: HADOOP-9993
> URL: https://issues.apache.org/jira/browse/HADOOP-9993
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation, fs
> Reporter: Chris Nauroth
>
> In discussion during MAPREDUCE-5508, we realized that any {{FileSystem}}
> subclass must implement an idempotent {{close}} method, due to potential
> multi-threaded interactions with the {{FileSystem#Cache}}. We should state
> this in the JavaDoc for {{FileSystem#close}}, so that subclass implementers
> are aware.
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