[jira] [Reopened] (HBASE-25594) graceful_stop.sh fails to unload regions when ran at localhost

["Michael Stack (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-25594?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Stack reopened HBASE-25594:
-----------------------------------

Reopening to apply the fix here instead of what was over in HBASE-25663.

> graceful_stop.sh fails to unload regions when ran at localhost
> --------------------------------------------------------------
>
>                 Key: HBASE-25594
>                 URL: https://issues.apache.org/jira/browse/HBASE-25594
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 3.0.0-alpha-1, 1.4.13
>            Reporter: Javier Akira Luca de Tena
>            Assignee: Javier Akira Luca de Tena
>            Priority: Minor
>
> We usually use graceful_stop.sh from the Master to restart RegionServers. However, in some scenarios we may not have privileges to restart remote RegionServers (it uses ssh).
>  But we can still use graceful_stop.sh on the same host we want to restart.
> In order to detect the execution at localhost, graceful_stop.sh uses /bin/hostname.
>  [https://github.com/apache/hbase/blob/cfbae4d3a37e7ac4d795461c3e19406a2786838d/bin/graceful_stop.sh#L106-L110]
> When RegionMover strips the host to not include it in the list of target hosts, we filter it out by checking all RegionServer hosts in the cluster:
>  [https://github.com/apache/hbase/blob/branch-2/hbase-server/src/main/java/org/apache/hadoop/hbase/util/RegionMover.java#L382-L384]
>  [https://github.com/apache/hbase/blob/cfbae4d3a37e7ac4d795461c3e19406a2786838d/hbase-server/src/main/java/org/apache/hadoop/hbase/util/RegionMover.java#L692]
> But the list of RegionServer hosts returned by Admin#getRegionServers are FDQN, while the hostname provided from graceful_stop.sh is not FDQN, making the comparison fail.
> Same happens for branch-1 region_mover.rb, which is the place I reproduced in my environment: 
> [https://github.com/apache/hbase/blob/f9a91488b2c39320bed502619bf7adb765c79de6/bin/region_mover.rb#L305]
> [https://github.com/apache/hbase/blob/f9a91488b2c39320bed502619bf7adb765c79de6/bin/region_mover.rb#L175]
>  [https://github.com/apache/hbase/blob/f9a91488b2c39320bed502619bf7adb765c79de6/bin/region_mover.rb#L186-L192]
>  
> This can be fixed just by using "/bin/hostname -f" in the graceful_stop.sh script.
> Will provide patch soon.



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