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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1554) New semantics for recoverLease
Date Mon, 10 Jan 2011 21:33:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979777#action_12979777
] 

Hairong Kuang commented on HDFS-1554:
-------------------------------------

Sorry that I forgot that I meant to introduce this new API to the trunk. Let me change this
jira's fix version to append 0.20 and then open a different jira for the trunk.

> 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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