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https://issues.apache.org/jira/browse/HBASE-4217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090043#comment-13090043
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ramkrishna.s.vasudevan commented on HBASE-4217:
-----------------------------------------------
@Stack
Thanks for your comments.
{bq}
javadoc needs to better specify that what we are expecting is the encoded
region name
The new api is not using the encoded region name. It accepts the region name
and servername. If server name is null it tries to invoke the existing
closeRegion api. in The exisiting closeRegion
{code}
Pair<HRegionInfo, ServerName> pair = MetaReader.getRegion(ct, regionname);
{code}
If we pass the encoded region name here it is not able to retrieve the pair
object. Hence i opted to get the actual region name convert to bytes, based on
the servername determine which closeRegion to call.Hence the name of the new
method was
closeRegionByRegionName().
Pls provide your suggestions.
> 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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