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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7824) Improve master start up time when there is log splitting work
Date Sun, 07 Apr 2013 01:21:16 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7824?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeffrey Zhong updated HBASE-7824:
---------------------------------

    Release Note: Master now won't wait for existing or previously left log splitting work(except
for ROOT and META region servers) finish before it can start up. Sometimes log splitting work
could take more than minuets. In normal case, master node starts much faster than before when
there is region server recovery work going on. The feature can be disabled by set configuration
value ""hbase.master.wait.for.log.splitting" to true.(default value is false)
    
> Improve master start up time when there is log splitting work
> -------------------------------------------------------------
>
>                 Key: HBASE-7824
>                 URL: https://issues.apache.org/jira/browse/HBASE-7824
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: Jeffrey Zhong
>            Assignee: Jeffrey Zhong
>             Fix For: 0.94.8
>
>         Attachments: hbase-7824.patch, hbase-7824_v2.patch, hbase-7824_v3.patch, hbase-7824-v7.patch,
hbase-7824-v8.patch
>
>
> When there is log split work going on, master start up waits till all log split work
completes even though the log split has nothing to do with meta region servers.
> It's a bad behavior considering a master node can run when log split is happening while
its start up is blocking by log split work. 
> Since master is kind of single point of failure, we should start it ASAP.

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