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From "Tsz Wo (Nicholas), SZE (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7973) DistributedFileSystem close has severe consequences
Date Fri, 20 Jan 2012 07:02:42 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189657#comment-13189657
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-7973:
------------------------------------------------

I [opposed ref counts previously|https://issues.apache.org/jira/browse/HADOOP-4655?focusedCommentId=12650342&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12650342]
since it is indeed a "get counts".  It relies on the assumption that "for each FileSystem.get(..)
call, the must be exactly a close() call."  I think this is not easy to enforce.
                
> 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-7973-2.patch, HADOOP-7973-3.patch, HADOOP-7973-4.patch, 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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