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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3285) Hlog recovery takes too much time
Date Wed, 23 Feb 2011 21:24:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998551#comment-12998551
] 

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

RecoverLease does not introduce any new exception. The patch changed to use recoverLease not
append to recover lease. HDFS-1554 did not introduce new API, but changed recoverLease semantics.

> 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: 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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