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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4437) Clients should not retain leases on moved files
Date Mon, 28 Jan 2013 15:37:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13564346#comment-13564346
] 

Daryn Sharp commented on HDFS-4437:
-----------------------------------

I think supporting file descriptor behavior is a great idea (we've internally talked about
this).  Until we do, I think the lease should be revoked.  My concerns with fd behavior would
be the ever pervasive "two wrongs make a right" where users are relying unintentionally on
renames breaking writers, and ensuring we get the security right to avoid attacks probing
for fileids.
                
> Clients should not retain leases on moved files
> -----------------------------------------------
>
>                 Key: HDFS-4437
>                 URL: https://issues.apache.org/jira/browse/HDFS-4437
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>
> Moving open files and/or parent directories of open files will rewrite the leases to
the new path.  The client is not notified so future stream operations will fail.  However,
as long as the client keeps its lease active it will have a "lock" on the file in its new
location.  This is not good for a daemon.
> Leases should be released after the file is moved.

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