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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3285) Hlog recovery takes too much time
Date Wed, 23 Feb 2011 21:16:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998549#comment-12998549
] 

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

@Hairong Are there new exceptions when hdfs-1554 is in place?  This patch seems to just catch
and wait and change whats logged, not call some new API (oh, it also adds a new convertion
to FNFE).  Thanks.

> 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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