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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3285) Hlog recovery takes too much time
Date Mon, 07 Mar 2011 18:56:59 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-3285:
-------------------------

       Resolution: Fixed
    Fix Version/s: 0.90.2
     Release Note: Adds hbase exploitation of  new lease recovery added by hdfs-1520.  New
API is available at tip of branch-0.20-append, in advance of the version of hadoop that ships
with 0.90.1 hbase (r1057313).  Must patch CDH to add the API.
           Status: Resolved  (was: Patch Available)

> 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
>             Fix For: 0.90.2
>
>         Attachments: 3285-v2.txt, 3285-v3.txt, hbaseRecoverHLog.patch, hdfs-1520,1555,1554-for-cdh3b2.txt
>
>
> 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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