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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9421) NNThroughputBenchmark replication test NPE with -namenode option
Date Thu, 12 Nov 2015 23:49:10 GMT
Xiaoyu Yao created HDFS-9421:
--------------------------------

             Summary: NNThroughputBenchmark replication test NPE with -namenode option
                 Key: HDFS-9421
                 URL: https://issues.apache.org/jira/browse/HDFS-9421
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Xiaoyu Yao


Hit the following NPE when reviewing fix for HDFS-9387 with manual tests as NNThroughputBenchmark
currently does not have JUnit tests. 
 
{code}
HW11217:centos6.4 xyao$ hadoop org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark
-op replication -namenode hdfs://HW11217.local:9000
15/11/12 14:52:03 INFO namenode.NNThroughputBenchmark: Starting benchmark: replication
15/11/12 14:52:03 ERROR namenode.NNThroughputBenchmark: java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark$ReplicationStats.generateInputs(NNThroughputBenchmark.java:1312)
	at org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark$OperationStatsBase.benchmark(NNThroughputBenchmark.java:280)
	at org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark.run(NNThroughputBenchmark.java:1509)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
	at org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark.main(NNThroughputBenchmark.java:1534)
...
{code}


However, the root cause is different from HDFS-9387.  
>From ReplicationStats#generateInputs, *nameNode* is uninitialized before use, which causes
the NPE.

{code}
      final FSNamesystem namesystem = nameNode.getNamesystem();
{code}

>From NNThroughputBenchmark#run, nameNode is only initialized when -namenode option is
not specified. The fix is to initialize it properly in the else block when -namenode option
is specified.

{code}
 if (namenodeUri == null) {
        nameNode = NameNode.createNameNode(argv, config);
        NamenodeProtocols nnProtos = nameNode.getRpcServer();
        nameNodeProto = nnProtos;
        clientProto = nnProtos;
        dataNodeProto = nnProtos;
        refreshUserMappingsProto = nnProtos;
        bpid = nameNode.getNamesystem().getBlockPoolId();
      } else {
        FileSystem.setDefaultUri(getConf(), namenodeUri);
        DistributedFileSystem dfs = (DistributedFileSystem)
            FileSystem.get(getConf());
        final URI nnUri = new URI(namenodeUri);
        nameNodeProto = DFSTestUtil.getNamenodeProtocolProxy(config, nnUri,
            UserGroupInformation.getCurrentUser());
 
{code}





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