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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1948) Forward port 'hdfs-1520 lightweight namenode operation to trigger lease reccovery'
Date Mon, 06 Jun 2011 17:43:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044979#comment-13044979
] 

Hairong Kuang commented on HDFS-1948:
-------------------------------------

Both patches look good! Stack, thanks for your time porting this feature.

For the trunk, we already moved away from the version based RPC compatibility. Instead we
take the method name base approach. Check HADOOP-6904. So there is no need to bump the version
number. Instead dfsclient should use the method name to see if the server supports recoverLease
or not.

> Forward port 'hdfs-1520 lightweight namenode operation to trigger lease reccovery'
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-1948
>                 URL: https://issues.apache.org/jira/browse/HDFS-1948
>             Project: Hadoop HDFS
>          Issue Type: Task
>            Reporter: stack
>            Assignee: stack
>         Attachments: 1948-part1.txt, 1948-v2.txt, 1948-v3.txt, 1948-v3.txt, 1948-v4.22.txt,
1948-v4.txt
>
>
> This issue is about forward porting from branch-0.20-append the little namenode api that
facilitates stealing of a file's lease.  The forward port would be an adaption of hdfs-1520
and its companion patches, hdfs-1555 and hdfs-1554, to suit the TRUNK.
> Intent is to get this fix into 0.22 time willing; i'll run a vote to get ok on getting
it added to branch.  HBase needs this facility.

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