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https://issues.apache.org/jira/browse/HBASE-4052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060052#comment-13060052
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Ted Yu commented on HBASE-4052:
-------------------------------

I think one source of confusion in the above description is that DISABLED and 
DISABLING states are TableState.
There is no concept of disabling/disabled region.

I would opt for Checking for DISABLED and DISABLING TableState.

I think the BulkAssigner in this case refers to EnableTableHandler.BulkEnabler 
which depends on assignmentManager.getRegionsOfTable() for the number of online 
regions.

You need to write a new method, e.g. 
assignmentManager.getOnlineRegionsOfTable(), and call it in place of 
assignmentManager.getRegionsOfTable() in EnableTableHandler.regionsToAssign()

> Enabling a table after master switch is not allowing table scan.  Throws 
> NotServingRegionException
> --------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4052
>                 URL: https://issues.apache.org/jira/browse/HBASE-4052
>             Project: HBase
>          Issue Type: Bug
>         Environment: Linux
>            Reporter: ramkrishna.s.vasudevan
>
> Following is the scenario:
> Start RS and Active and standby masters
> Create table and insert data.
> Disable the table.
> Stop the active master and switch to the standby master.
> Now enable the table.
> Do a scan on the enabled table.
> NotServingRegionException is Thrown.
> But the same works well when we dont switch the master.

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