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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16008) A robust way deal with early termination of HBCK
Date Thu, 23 Jun 2016 06:09:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15345840#comment-15345840
] 

Heng Chen commented on HBASE-16008:
-----------------------------------

After check the patch,  the idea with 'Maintenance' mode looks good to me.   So if there is
another tool needs disable some switch,  it has to create the same znode, right?  All tools
which need disable one switch can't be run simultaneously.  This maybe one problem some day.

> A robust way deal with early termination of HBCK
> ------------------------------------------------
>
>                 Key: HBASE-16008
>                 URL: https://issues.apache.org/jira/browse/HBASE-16008
>             Project: HBase
>          Issue Type: Improvement
>          Components: hbck
>            Reporter: Stephen Yuan Jiang
>            Assignee: Stephen Yuan Jiang
>
> When HBCK is running, we want to disable Catalog Janitor, Balancer and Split/Merge. 
Today, the implementation is not robust.  If HBCK is terminated earlier by Control-C, the
changed state would not be reset to original.  
> HBASE-15406 was trying to solve this problem for Split/Merge switch.  The implementation
is complicated, and it did not solve CJ and Balancer.  
> We also have another problem is that to prevent multiple HBCK run, we used a file lock
to indicate a running HBCK; earlier terminating might not clean up the file.  Sometimes we
have to manually remove the file so that future HBCK could run.  
> The proposal to solve all the problem is to use a znode to indicate that one HBCK is
running.  CJ, balancer, and Split/Merge switch all look for this znode before doing it operation.
 



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