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From "Daryn Sharp (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7973) DistributedFileSystem close has severe consequences
Date Tue, 17 Jan 2012 21:31:39 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13188025#comment-13188025
] 

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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