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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-1441) NPE in ProcessRegionStatusChange#getMetaRegion
Date Wed, 20 May 2009 04:00:45 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack resolved HBASE-1441.
--------------------------

       Resolution: Fixed
    Fix Version/s: 0.20.0

Committed below:

{code}
Index: src/java/org/apache/hadoop/hbase/master/ProcessRegionStatusChange.java
===================================================================
--- src/java/org/apache/hadoop/hbase/master/ProcessRegionStatusChange.java      (revision
776452)
+++ src/java/org/apache/hadoop/hbase/master/ProcessRegionStatusChange.java      (working copy)
@@ -71,8 +71,10 @@
     } else {
       this.metaRegion =
         master.regionManager.getFirstMetaRegionForRegion(regionInfo);
-      this.metaRegionName = this.metaRegion.getRegionName();
+      if (this.metaRegion != null) {
+        this.metaRegionName = this.metaRegion.getRegionName();
+      }
     }
     return this.metaRegion;
   }
-}
\ No newline at end of file
+}
{code}

Will probably just push the prob. up but that'll be some kinda progress.

> NPE in ProcessRegionStatusChange#getMetaRegion
> ----------------------------------------------
>
>                 Key: HBASE-1441
>                 URL: https://issues.apache.org/jira/browse/HBASE-1441
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.20.0
>
>
> Testing killing of regionserver hosting .META., came across following:
> {code}
> 2009-05-20 03:50:44,130 [HMaster] INFO org.apache.hadoop.hbase.regionserver.HLog: Triggering
lease recovery
> org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException:
failed to create file /hbasetrunk2/.logs/aa0-000-15.u.powerset.com_1242789840075_60021/hlog.dat.1242790948114
for DFSClient_1104727689 on client 208.76.44.139, because this file is already being created
by DFSClient_1020405213 on 208.76.44.142
>     at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1058)
>     at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.appendFile(FSNamesystem.java:1146)
>     at org.apache.hadoop.hdfs.server.namenode.NameNode.append(NameNode.java:392)
>     at sun.reflect.GeneratedMethodAccessor18.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$Server.call(RPC.java:508)
>     at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
>     at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at javax.security.auth.Subject.doAs(Subject.java:396)
>     at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
>     at org.apache.hadoop.ipc.Client.call(Client.java:739)
>     at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
>     at $Proxy0.append(Unknown Source)
>     at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
>     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)
>     at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
>     at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
>     at $Proxy0.append(Unknown Source)
>     at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:487)
>     at org.apache.hadoop.hdfs.DistributedFileSystem.append(DistributedFileSystem.java:186)
>     at org.apache.hadoop.fs.FileSystem.append(FileSystem.java:525)
>     at org.apache.hadoop.hbase.regionserver.HLog.splitLog(HLog.java:799)
>     at org.apache.hadoop.hbase.regionserver.HLog.splitLog(HLog.java:752)
>     at org.apache.hadoop.hbase.master.ProcessServerShutdown.process(ProcessServerShutdown.java:248)
>     at org.apache.hadoop.hbase.master.HMaster.processToDoQueue(HMaster.java:456)
>     at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:392)
> 2009-05-20 03:50:45,496 [HMaster] INFO org.apache.hadoop.hbase.regionserver.HLog: Past
out lease recovery
> 2009-05-20 03:50:45,524 [HMaster] DEBUG org.apache.hadoop.hbase.regionserver.HLog: Adding
queue for TestTable,0026910374,1242790893613
> 2009-05-20 03:50:45,765 [HMaster] DEBUG org.apache.hadoop.hbase.regionserver.HLog: Adding
queue for .META.,,1
> 2009-05-20 03:50:46,737 [HMaster] DEBUG org.apache.hadoop.hbase.regionserver.HLog: IOE
Pushed 61380 entries from hdfs://aa0-000-12.u.powerset.com:9000/hbasetrunk2/.logs/aa0-000-15.u.powerset.com_1242789840075_60021/hlog.dat.1242790948114
> 2009-05-20 03:50:46,750 [pool-4-thread-1] DEBUG org.apache.hadoop.hbase.regionserver.HLog:
Thread got 10 to process
> 2009-05-20 03:50:46,750 [pool-4-thread-1] DEBUG org.apache.hadoop.hbase.regionserver.HLog:
Applied 10 total edits to .META.,,1 in 0ms
> 2009-05-20 03:50:46,762 [pool-4-thread-2] DEBUG org.apache.hadoop.hbase.regionserver.HLog:
Thread got 61370 to process
> 2009-05-20 03:50:47,990 [pool-4-thread-2] DEBUG org.apache.hadoop.hbase.regionserver.HLog:
Applied 61370 total edits to TestTable,0026910374,1242790893613 in 1227ms
> 2009-05-20 03:50:48,289 [HMaster] INFO org.apache.hadoop.hbase.regionserver.HLog: hlog
file splitting completed in 106378 millis for hdfs://aa0-000-12.u.powerset.com:9000/hbasetrunk2/.logs/aa0-000-15.u.powerset.com_1242789840075_60021
> 2009-05-20 03:50:48,299 [HMaster] DEBUG org.apache.hadoop.hbase.master.ProcessServerShutdown$ScanRootRegion:
process server shutdown scanning root region on 208.76.44.141
> 2009-05-20 03:50:48,304 [HMaster] DEBUG org.apache.hadoop.hbase.master.RegionServerOperation:
Shutdown scanner for aa0-000-15.u.powerset.com_1242789840075_60021 processing .META.,,1
> 2009-05-20 03:50:48,305 [HMaster] DEBUG org.apache.hadoop.hbase.master.RegionServerOperation:
removing meta region .META.,,1 from online meta regions
> 2009-05-20 03:50:48,307 [HMaster] DEBUG org.apache.hadoop.hbase.master.RegionServerOperation:
process server shutdown scanning root region on 208.76.44.141 finished HMaster
> 2009-05-20 03:50:48,307 [HMaster] DEBUG org.apache.hadoop.hbase.master.RegionServerOperation:
numberOfMetaRegions: 1, onlineMetaRegions.size(): 0
> 2009-05-20 03:50:48,307 [HMaster] DEBUG org.apache.hadoop.hbase.master.RegionServerOperation:
Requeuing because not all meta regions are online
> 2009-05-20 03:50:48,308 [HMaster] DEBUG org.apache.hadoop.hbase.master.HMaster: Processing
todo: PendingOpenOperation from aa0-000-12.u.powerset.com_1242789840315_60021
> 2009-05-20 03:50:48,309 [HMaster] WARN org.apache.hadoop.hbase.master.HMaster: Processing
pending operations: PendingOpenOperation from aa0-000-12.u.powerset.com_1242789840315_60021
> java.lang.NullPointerException
>     at org.apache.hadoop.hbase.master.ProcessRegionStatusChange.getMetaRegion(ProcessRegionStatusChange.java:74)
>     at org.apache.hadoop.hbase.master.ProcessRegionOpen.process(ProcessRegionOpen.java:61)
>     at org.apache.hadoop.hbase.master.HMaster.processToDoQueue(HMaster.java:456)
>     at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:392)
> {code}

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