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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9249) NPE thrown if an IOException is thrown in NameNode.<init>
Date Thu, 15 Oct 2015 15:58:05 GMT
Wei-Chiu Chuang created HDFS-9249:
-------------------------------------

             Summary: NPE thrown if an IOException is thrown in NameNode.<init>
                 Key: HDFS-9249
                 URL: https://issues.apache.org/jira/browse/HDFS-9249
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Wei-Chiu Chuang
            Assignee: Wei-Chiu Chuang
            Priority: Minor


This issue was found when running test case TestBackupNode.testCheckpointNode, but upon closer
look, the problem is not due to the test case.

Looks like an IOException was thrown in
    try {
      initializeGenericKeys(conf, nsId, namenodeId);
      initialize(conf);
      try {
        haContext.writeLock();
        state.prepareToEnterState(haContext);
        state.enterState(haContext);
      } finally {
        haContext.writeUnlock();
      }
causing the namenode to stop, but the namesystem was not yet properly instantiated, causing
NPE.

I tried to reproduce locally, but to no avail.

Because I could not reproduce the bug, and the log does not indicate what caused the IOException,
I suggest make this a supportability JIRA to log the exception for future improvement.

Stacktrace
java.lang.NullPointerException: null
at org.apache.hadoop.hdfs.server.namenode.NameNode.getFSImage(NameNode.java:906)
at org.apache.hadoop.hdfs.server.namenode.BackupNode.stop(BackupNode.java:210)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:827)
at org.apache.hadoop.hdfs.server.namenode.BackupNode.<init>(BackupNode.java:89)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1474)
at org.apache.hadoop.hdfs.server.namenode.TestBackupNode.startBackupNode(TestBackupNode.java:102)
at org.apache.hadoop.hdfs.server.namenode.TestBackupNode.testCheckpoint(TestBackupNode.java:298)
at org.apache.hadoop.hdfs.server.namenode.TestBackupNode.testCheckpointNode(TestBackupNode.java:130)
The last few lines of log:
2015-10-14 19:45:07,807 INFO namenode.NameNode (NameNode.java:createNameNode(1422)) - createNameNode
[-checkpoint]
2015-10-14 19:45:07,807 INFO impl.MetricsSystemImpl (MetricsSystemImpl.java:init(158)) - CheckpointNode
metrics system started (again)
2015-10-14 19:45:07,808 INFO namenode.NameNode (NameNode.java:setClientNamenodeAddress(402))
- fs.defaultFS is hdfs://localhost:37835
2015-10-14 19:45:07,808 INFO namenode.NameNode (NameNode.java:setClientNamenodeAddress(422))
- Clients are to use localhost:37835 to access this namenode/service.
2015-10-14 19:45:07,810 INFO hdfs.MiniDFSCluster (MiniDFSCluster.java:shutdown(1708)) - Shutting
down the Mini HDFS Cluster
2015-10-14 19:45:07,810 INFO namenode.FSNamesystem (FSNamesystem.java:stopActiveServices(1298))
- Stopping services started for active state
2015-10-14 19:45:07,811 INFO namenode.FSEditLog (FSEditLog.java:endCurrentLogSegment(1228))
- Ending log segment 1
2015-10-14 19:45:07,811 INFO namenode.FSNamesystem (FSNamesystem.java:run(5306)) - NameNodeEditLogRoller
was interrupted, exiting
2015-10-14 19:45:07,811 INFO namenode.FSEditLog (FSEditLog.java:printStatistics(703)) - Number
of transactions: 3 Total time for transactions(ms): 0 Number of transactions batched in Syncs:
0 Number of syncs: 4 SyncTimes(ms): 2 1 
2015-10-14 19:45:07,811 INFO namenode.FSNamesystem (FSNamesystem.java:run(5373)) - LazyPersistFileScrubber
was interrupted, exiting
2015-10-14 19:45:07,822 INFO namenode.FileJournalManager (FileJournalManager.java:finalizeLogSegment(142))
- Finalizing edits file /data/jenkins/workspace/CDH5.5.0-Hadoop-HDFS-2.6.0/hadoop-hdfs-project/hadoop-hdfs/target/test/data/dfs/name1/current/edits_inprogress_0000000000000000001
-> /data/jenkins/workspace/CDH5.5.0-Hadoop-HDFS-2.6.0/hadoop-hdfs-project/hadoop-hdfs/target/test/data/dfs/name1/current/edits_0000000000000000001-0000000000000000003
2015-10-14 19:45:07,835 INFO namenode.FileJournalManager (FileJournalManager.java:finalizeLogSegment(142))
- Finalizing edits file /data/jenkins/workspace/CDH5.5.0-Hadoop-HDFS-2.6.0/hadoop-hdfs-project/hadoop-hdfs/target/test/data/dfs/name2/current/edits_inprogress_0000000000000000001
-> /data/jenkins/workspace/CDH5.5.0-Hadoop-HDFS-2.6.0/hadoop-hdfs-project/hadoop-hdfs/target/test/data/dfs/name2/current/edits_0000000000000000001-0000000000000000003
2015-10-14 19:45:07,836 INFO blockmanagement.CacheReplicationMonitor (CacheReplicationMonitor.java:run(169))
- Shutting down CacheReplicationMonitor
2015-10-14 19:45:07,836 INFO ipc.Server (Server.java:stop(2485)) - Stopping server on 37835
2015-10-14 19:45:07,837 INFO ipc.Server (Server.java:run(718)) - Stopping IPC Server listener
on 37835
2015-10-14 19:45:07,837 INFO ipc.Server (Server.java:run(844)) - Stopping IPC Server Responder
2015-10-14 19:45:07,837 INFO blockmanagement.BlockManager (BlockManager.java:run(3781)) -
Stopping ReplicationMonitor.
2015-10-14 19:45:07,838 WARN blockmanagement.DecommissionManager (DecommissionManager.java:run(78))
- Monitor interrupted: java.lang.InterruptedException: sleep interrupted
2015-10-14 19:45:07,844 INFO namenode.FSNamesystem (FSNamesystem.java:stopActiveServices(1298))
- Stopping services started for active state
2015-10-14 19:45:07,845 INFO namenode.FSNamesystem (FSNamesystem.java:stopStandbyServices(1386))
- Stopping services started for standby state
2015-10-14 19:45:07,848 INFO mortbay.log (Slf4jLog.java:info(67)) - Stopped HttpServer2$SelectChannelConnectorWithSafeStartup@localhost:0



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