[jira] [Issue Comment Edited] (HBASE-4880) Region is on service before completing openRegionHanlder, may cause data loss

["Ted Yu (Issue Comment Edited) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164104#comment-13164104 ] 

Ted Yu edited comment on HBASE-4880 at 12/7/11 3:12 AM:
--------------------------------------------------------

Did TestAdmin pass for patch v2?
                
      was (Author: yuzhihong@gmail.com):
    Did RestAdmin pass for patch v2?
                  
> Region is on service before completing openRegionHanlder, may cause data loss
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-4880
>                 URL: https://issues.apache.org/jira/browse/HBASE-4880
>             Project: HBase
>          Issue Type: Bug
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: hbase-4880.patch, hbase-4880v2.patch
>
>
> OpenRegionHandler in regionserver is processed as the following steps:
> {code}
> 1.openregion()(Through it, closed = false, closing = false)
> 2.addToOnlineRegions(region)
> 3.update .meta. table 
> 4.update ZK's node state to RS_ZK_REGION_OPEND
> {code}
> We can find that region is on service before Step 4.
> It means client could put data to this region after step 3.
> What will happen if step 4 is failed processing?
> It will execute OpenRegionHandler#cleanupFailedOpen which will do closing region, and master assign this region to another regionserver.
> If closing region is failed, the data which is put between step 3 and step 4 may loss, because the region has been opend on another regionserver and be put new data. Therefore, it may not be recoverd through replayRecoveredEdit() because the edit's LogSeqId is smaller than current region SeqId.

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