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Date: Mon, 7 Mar 2011 21:08:59 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] Commented: (HBASE-3285) Hlog recovery takes too much time
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    [ https://issues.apache.org/jira/browse/HBASE-3285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003606#comment-13003606 ] 

Hudson commented on HBASE-3285:
-------------------------------

Integrated in HBase-TRUNK #1771 (See [https://hudson.apache.org/hudson/job/HBase-TRUNK/1771/])
    HBASE-3285 Hlog recovery takes too much time


> Hlog recovery takes too much time
> ---------------------------------
>
>                 Key: HBASE-3285
>                 URL: https://issues.apache.org/jira/browse/HBASE-3285
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.90.2
>
>         Attachments: 0004-Added-in-the-hdfs-1520-1555-1554-from-tip-of-the-bra.patch, 3285-v2.txt, 3285-v3.txt, hbaseRecoverHLog.patch, hdfs-1520,1555,1554-for-cdh3b2.txt
>
>
> 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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