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https://issues.apache.org/jira/browse/HADOOP-2338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12548732
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stack commented on HADOOP-2338:
-------------------------------
If regionserver fails to record split in META, there is no other means of
master finding daughter regions. What happens on restart? We pick up the
parent again? The daughter regions will be by-passed?
> [hbase] NPE in master server
> ----------------------------
>
> Key: HADOOP-2338
> URL: https://issues.apache.org/jira/browse/HADOOP-2338
> Project: Hadoop
> Issue Type: Bug
> Components: contrib/hbase
> Affects Versions: 0.16.0
> Reporter: Jim Kellerman
> Assignee: Jim Kellerman
> Fix For: 0.16.0
>
> Attachments: master.log.gz, patch.txt
>
>
> Master gets an NPE after receiving multiple responses from the same server
> telling the master it has opened a region.
> {code}
> 2007-12-02 20:31:37,515 DEBUG hbase.HRegion - Next sequence id for region
> postlog,img254/577/02suecia024richardburnson0.jpg,1196619667879 is 73377537
> 2007-12-02 20:31:37,517 INFO hbase.HRegion - region
> postlog,img254/577/02suecia024richardburnson0.jpg,1196619667879 available
> 2007-12-02 20:31:39,200 WARN hbase.HRegionServer - Processing message
> (Retry: 0)
> java.io.IOException: java.io.IOException: java.lang.NullPointerException
> at org.apache.hadoop.hbase.HMaster.processMsgs(HMaster.java :1484)
> at org.apache.hadoop.hbase.HMaster.regionServerReport(HMaster.java:1423)
> at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java
> :25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:379)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0 (Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java
> :27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:82)
> at org.apache.hadoop.hbase.RemoteExceptionHandler.checkIOException
> (RemoteExceptionHandler.java:48)
> at org.apache.hadoop.hbase.HRegionServer.run(HRegionServer.java:759)
> at java.lang.Thread.run(Thread.java:619)
> case HMsg.MSG_REPORT_PROCESS_OPEN:
> synchronized ( this.assignAttempts) {
> // Region server has acknowledged request to open region.
> // Extend region open time by 1/2 max region open time.
> **1484** assignAttempts.put(region.getRegionName (),
> Long.valueOf(assignAttempts.get(
> region.getRegionName()).longValue() +
> (this.maxRegionOpenTime / 2)));
> }
> break;
> {code}
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