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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4217) HRS.closeRegion should be able to close regions with only the encoded name
Date Tue, 23 Aug 2011 19:08:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089670#comment-13089670
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stack commented on HBASE-4217:
------------------------------

A few comments Ram.

The method you add to HBaseAdmin needs a different name and the javadoc needs to better specify
that what we are expecting is the encoded region name.  So something like closeRegionWithEncodedRegionName.
 Then the javadoc for regionname should explain what the encoded part of a region name is.
  You need to better differentiate this method from the other two closeRegion methods that
are in HBaseAdmin.

Similar for the new method added to the HRegionInterface (and you don't need javadoc in HRS
since its implementing the Interface so it shoudl inherit the Interface doc)

Do we not have a TestAdmin class already?  Should these new tests go in there instead or into
class of their own?

Otherwise, patch looks great Ram... 

Oh, what about updating the shell so when you do close_region, it uses your new method?

Good stuff.

> HRS.closeRegion should be able to close regions with only the encoded name
> --------------------------------------------------------------------------
>
>                 Key: HBASE-4217
>                 URL: https://issues.apache.org/jira/browse/HBASE-4217
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.4
>            Reporter: Jean-Daniel Cryans
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.92.0
>
>         Attachments: HBASE-4217.patch, HBASE-4217_1.patch
>
>
> 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.

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