[jira] [Commented] (AMBARI-4499) Add support for marking hbase RS instances as DRAINING before decommission

["Sumit Mohanty (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMBARI-4499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889786#comment-13889786 ] 

Sumit Mohanty commented on AMBARI-4499:
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[~aonishuk], I still ended up using the default() option for configs because for decommission the default values made sense. Also the implementation relies on the default values to make decision. When it was assigned UnassignedConfiguration then there was no good way to verify that its is UnassignedConfiguration and then do something based on that.

> Add support for marking hbase RS instances as DRAINING before decommission
> --------------------------------------------------------------------------
>
>                 Key: AMBARI-4499
>                 URL: https://issues.apache.org/jira/browse/AMBARI-4499
>             Project: Ambari
>          Issue Type: Bug
>          Components: controller
>    Affects Versions: 1.5.0
>            Reporter: Sumit Mohanty
>            Assignee: Sumit Mohanty
>             Fix For: 1.5.0
>
>         Attachments: AMBARI-4499.patch
>
>
> Hbase decommission is actually a graceful stop under the cover. One critical component of graceful stop is to mark candidate region server instances as "draining". This is required when more than one node is being stopped so that regions being moved out of one node do not end up on the another node that is also a candidate of graceful stop.



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