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https://issues.apache.org/jira/browse/HBASE-4880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164110#comment-13164110
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chunhui shen commented on HBASE-4880:
-------------------------------------
@Ted
TestAdmin has passed for patch v2, and you could try again.
> 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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