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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HDFS-1554) New semantics for recoverLease
Date Mon, 10 Jan 2011 19:04:47 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang resolved HDFS-1554.
---------------------------------

      Resolution: Fixed
    Release Note: Change recoverLease API to return if the file is closed or not. It also
change the semantics of recoverLease to start lease recovery immediately.
    Hadoop Flags: [Incompatible change, Reviewed]

I've committed this. Thank Dhruba for reviewing the patch.

> New semantics for recoverLease
> ------------------------------
>
>                 Key: HDFS-1554
>                 URL: https://issues.apache.org/jira/browse/HDFS-1554
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.20-append, 0.22.0, 0.23.0
>
>         Attachments: appendRecoverLease.patch, appendRecoverLease1.patch
>
>
> Current recoverLease API implemented in append 0.20 aims to provide a lighter weight
(comparing to using create/append) way to trigger a file's soft lease expiration. From both
the use case of hbase and scribe, it could have a stronger semantics: revoking the file's
lease, thus starting lease recovery immediately.
> Also I'd like to port this recoverLease API to HDFS 0.22 and trunk since HBase is moving
to HDFS 0.22.

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