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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7824) Improve master start up time when there is log splitting work
Date Sun, 07 Apr 2013 06:21:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13624740#comment-13624740
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chunhui shen commented on HBASE-7824:
-------------------------------------

bq.Since ZK session timeout take a while, HMaster#splitLogAndExpireIfOnline will kick in so
there won't be any issue.
1.ZK seession will timeout once java process exit.
2.I think in a complex network we shouldn't assert that ZK session timeout happen after HMaster#splitLogAndExpireIfOnline.
e.g. the return of getMetaLocationOrReadLocationFromRoot is hanged for a little time.

bq.are you fine with this adjustment?
Sorry, why do this adjustment?


In addition, is it only for 0.94, no trunk?  If trunk only, I think there is no above trouble
since ROOT has dropped in trunk

                
> 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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