[jira] [Commented] (HBASE-4277) HRS.closeRegion should be able to close regions with only the encoded name

["ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104406#comment-13104406 ] 

ramkrishna.s.vasudevan commented on HBASE-4277:
-----------------------------------------------

For rolling restart verification the following steps were taken
-> Start 2 RS with 0.90.x version one with patch other without patch.
-> Have a client with the patched version
-> Call the new api added in this defect for a region in the patched version
   This works fine.
-> Call a region in the unpatch version
   We get NoSuchMethod found exception.



> HRS.closeRegion should be able to close regions with only the encoded name
> --------------------------------------------------------------------------
>
>                 Key: HBASE-4277
>                 URL: https://issues.apache.org/jira/browse/HBASE-4277
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.4
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Critical
>             Fix For: 0.92.0, 0.90.5
>
>         Attachments: HBASE-4277_0.90.patch
>
>
> As suggested by Stack in HBASE-4217 creating a new issue to provide a patch for 0.90.x version.
> We had some sort of an outage this morning due to a few racks losing power, and some regions were left in the following state:
> ERROR: Region UNKNOWN_REGION on sv4r17s9:60020, key=e32bbe1f48c9b3633c557dc0291b90a3, not on HDFS or in META but deployed on sv4r17s9:60020
> That region was deleted by the master but the region server never got the memo. Right now there's no way to force close it because HRS.closeRegion requires an HRI and the only way to create one is to get it from .META. which in our case doesn't contain a row for that region. Basically we have to wait until that server is dead to get rid of the region and make hbck happy.
> The required change is to have closeRegion accept an encoded name in both HBA (when the RS address is provided) and HRS since it's able to find it anyways from it's list of live regions.
> bq.If a 0.90 version, we maybe should do that in another issue.

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