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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2011/03/05 05:31:46 UTC

[jira] Commented: (HBASE-3285) Hlog recovery takes too much time

    [ https://issues.apache.org/jira/browse/HBASE-3285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002921#comment-13002921 ] 

stack commented on HBASE-3285:
------------------------------

All tests on 0.90 pass w/ this patch in place.  TestReplication failed but when I ran it alone it passed.

> 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
>         Attachments: 3285-v2.txt, hbaseRecoverHLog.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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