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From "chunhui shen (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4880) Region is on service before completing openRegionHanlder, may cause data loss
Date Mon, 28 Nov 2011 05:18:39 GMT
Region is on service before completing openRegionHanlder, may cause data loss
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                 Key: HBASE-4880
                 URL: https://issues.apache.org/jira/browse/HBASE-4880
             Project: HBase
          Issue Type: Bug
            Reporter: chunhui shen


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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