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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3285) Hlog recovery takes too much time
Date Wed, 01 Dec 2010 06:22:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965579#action_12965579
] 

Hairong Kuang commented on HBASE-3285:
--------------------------------------

This issue does not speedup the lease recovery process but will reduce the cost of triggering
lease recovery. In our environment, we have observed over 10 minutes for append to finish
due to a problematic datanode in the pipeline.

> 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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