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Date: Fri, 10 Dec 2010 00:39:02 -0500 (EST)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1520) HDFS 20 append: Lightweight NameNode
 operation to trigger lease recovery
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    [ https://issues.apache.org/jira/browse/HDFS-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970075#action_12970075 ] 

dhruba borthakur commented on HDFS-1520:
----------------------------------------

+1 code looks good. I also ran all the new unit tests.

> 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
>    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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