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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1520) HDFS 20 append: Lightweight NameNode operation to trigger lease recovery
Date Fri, 17 Jun 2011 12:53:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13051046#comment-13051046
] 

Hudson commented on HDFS-1520:
------------------------------

Integrated in Hadoop-Hdfs-trunk #699 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/699/])
    

> HDFS 20 append: Lightweight NameNode operation to trigger lease recovery
> ------------------------------------------------------------------------
>
>                 Key: HDFS-1520
>                 URL: https://issues.apache.org/jira/browse/HDFS-1520
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>    Affects Versions: 0.20-append
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.20-append
>
>         Attachments: recoverLeaseApache20.patch
>
>
> Currently HBase uses append to trigger the close of HLog during Hlog split. Append is
a very expensive operation, which involves not only NameNode operations but creating a writing
pipeline. If one of datanodes on the pipeline has a problem, this recovery may takes minutes.
I'd like implement a lightweight NameNode operation to trigger lease recovery and make HBase
to use this instead.

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