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https://issues.apache.org/jira/browse/HBASE-4880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163943#comment-13163943
]
Zhihong Yu commented on HBASE-4880:
-----------------------------------
TestAdmin#testForceSplit would fail if I comment out the following line in
HRegionServer.postOpenDeployTasks():
{code}
- addToOnlineRegions(r);
+ // addToOnlineRegions(r);
{code}
This is the error:
{code}
org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException: Failed 1
action: NotServingRegionException: 1 time, servers with issues:
lm-sjn-xx:65442,
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatchCallback(HConnectionManager.java:1641)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatch(HConnectionManager.java:1409)
at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:892)
at org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:750)
at org.apache.hadoop.hbase.client.HTable.put(HTable.java:725)
at
org.apache.hadoop.hbase.client.TestAdmin.splitTest(TestAdmin.java:805)
at
org.apache.hadoop.hbase.client.TestAdmin.testForceSplit(TestAdmin.java:108)
{code}
> 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
>
>
> 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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