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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3285) Hlog recovery takes too much time
Date Tue, 30 Nov 2010 00:51:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965038#action_12965038
] 

Jean-Daniel Cryans commented on HBASE-3285:
-------------------------------------------

Would this new NN operation still goes through the lease recovery? In my experience, waiting
on the leases to expire has been our biggest source of downtime.

> 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
>
> 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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