[jira] [Commented] (HBASE-16008) A robust way deal with early termination of HBCK

["Stephen Yuan Jiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-16008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15341257#comment-15341257 ] 

Stephen Yuan Jiang commented on HBASE-16008:
--------------------------------------------

A draft patch can be reviewed in RB: https://reviews.apache.org/r/49011/ 

> 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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