hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7824) Improve master start up time when there is log splitting work
Date Tue, 09 Apr 2013 03:32:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13626182#comment-13626182
] 

Jeffrey Zhong commented on HBASE-7824:
--------------------------------------

[~zjushch] Could you please clarify RS1 online state from step 4 to step 6? Thanks.

In step4, RS1 is recorded as online by Master while in step 5 we return RS1 as dead. AM#rebuildUserRegions
only returns dead servers which are not contained in online servers. 
Since AssignmentManager#processDeadServersAndRecoverLostRegions skips all dead servers for
region assignment, it seems you're suggesting RS1 online again in step 6.

                
> 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-v10.patch, hbase-7824_v2.patch, hbase-7824_v3.patch,
hbase-7824-v7.patch, hbase-7824-v8.patch, hbase-7824-v9.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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message