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https://issues.apache.org/jira/browse/HBASE-15911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15309091#comment-15309091
]
Pankaj Kumar commented on HBASE-15911:
--------------------------------------
NPE will be thrown when HM is still in initialization phase (not completed
initialization) and by that time RS send "reportRegionStateTransition" ,
AssignmentManager.onRegionTransition()
{code}
case READY_TO_SPLIT:
try {
regionStateListener.onRegionSplit(hri);
if (!((HMaster)server).getSplitOrMergeTracker().isSplitOrMergeEnabled(
Admin.MasterSwitchType.SPLIT)) {
errorMsg = "split switch is off!";
}
} catch (IOException exp) {
errorMsg = StringUtils.stringifyException(exp);
}
break;
{code}
regionStateListener will be initialized during Quota Manager initialization,
HMaster.finishActiveMasterInitialization()
{code}
status.setStatus("Starting quota manager");
initQuotaManager();
{code}
> NPE in AssignmentManager.onRegionTransition after Master restart
> ----------------------------------------------------------------
>
> Key: HBASE-15911
> URL: https://issues.apache.org/jira/browse/HBASE-15911
> Project: HBase
> Issue Type: Bug
> Components: master, Region Assignment
> Affects Versions: 1.3.0
> Reporter: Mikhail Antonov
> Assignee: Mikhail Antonov
>
> 16/05/27 17:49:18 ERROR ipc.RpcServer: Unexpected throwable object
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.master.AssignmentManager.onRegionTransition(AssignmentManager.java:4364)
> at
> org.apache.hadoop.hbase.master.MasterRpcServices.reportRegionStateTransition(MasterRpcServices.java:1421)
> at
> org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos$RegionServerStatusService$2.callBlockingMethod(RegionServerStatusProtos.java:8623)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2239)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:116)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:137)
> at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:112)
> at java.lang.Thread.run(Thread.java:745)
> I'm pretty sure I've seen it before and more than once, but never got to dig
> in.
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