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From "Nathan Roberts (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7973) DistributedFileSystem close has severe consequences
Date Tue, 17 Jan 2012 15:37:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187756#comment-13187756
] 

Nathan Roberts commented on HADOOP-7973:
----------------------------------------

{quote}
We'll experiment on a performance grid and see what happens with the cache off. I'm concerned
about whether GC will keep up with all the leaked FileSystem and DFSClient objects.
{quote}

Seems to me that turning off the cache is changing the semantics of FileSystem#close as much
as some of the other proposed solutions. Rather than just temporarily avoiding this issue
via a config change, can we come up with a more permanent solution that everyone will be happy
with?  
                
> 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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