[jira] [Comment Edited] (HBASE-9480) Regions are unexpectedly made offline in certain failure conditions

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-9480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13763524#comment-13763524 ] 

Jimmy Xiang edited comment on HBASE-9480 at 9/10/13 9:17 PM:
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Can we add some sleep before retrying sendRegionClose similar to what is for assign?
                
      was (Author: jxiang):
    Can we add some sleep before retrying sendRegionClose?
                  
> Regions are unexpectedly made offline in certain failure conditions
> -------------------------------------------------------------------
>
>                 Key: HBASE-9480
>                 URL: https://issues.apache.org/jira/browse/HBASE-9480
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Devaraj Das
>            Priority: Critical
>             Fix For: 0.96.0
>
>         Attachments: 9480-1.txt
>
>
> Came across this issue (HBASE-9338 test):
> 1. Client issues a request to move a region from ServerA to ServerB
> 2. ServerA is compacting that region and doesn't close region immediately. In fact, it takes a while to complete the request.
> 3. The master in the meantime, sends another close request.
> 4. ServerA sends it a NotServingRegionException
> 5. Master handles the exception, deletes the znode, and invokes regionOffline for the said region.
> 6. ServerA fails to operate on ZK in the CloseRegionHandler since the node is deleted.
> The region is permanently offline.
> There are potentially other situations where when a RegionServer is offline and the client asks for a region move off from that server, the master makes the region offline.

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