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https://issues.apache.org/jira/browse/HADOOP-7973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13188025#comment-13188025
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Daryn Sharp commented on HADOOP-7973:
-------------------------------------
bq. It is correct that connections are re-used and cache growing huge is also
an issue that we have seen before. It was fixed by calling closeAllForUGI in
TaskTracker.
If the cache is turned off, doesn't the {{FileSystem.closeAllForUGI}}
improvement become irrelevant since it depends on the cache to locate the
objects to close? Ie. Won't the {{FileSystem}}, {{DFSClient}}, and
{{Connection}} float in limbo and bloat memory until the GC finalizes them?
> DistributedFileSystem close has severe consequences
> ---------------------------------------------------
>
> Key: HADOOP-7973
> URL: https://issues.apache.org/jira/browse/HADOOP-7973
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 1.0.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Blocker
> Attachments: HADOOP-7973.patch
>
>
> The way {{FileSystem#close}} works is very problematic. Since the
> {{FileSystems}} are cached, any {{close}} by any caller will cause problems
> for every other reference to it. Will add more detail in the comments.
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