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From "Emir Ibrahimbegovic (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8778) Null pointer exception when trying to get job name by job id from jobClient
Date Fri, 07 Sep 2012 14:08:07 GMT
Emir Ibrahimbegovic created HADOOP-8778:
-------------------------------------------

             Summary: Null pointer exception when trying to get job name by job id from jobClient
                 Key: HADOOP-8778
                 URL: https://issues.apache.org/jira/browse/HADOOP-8778
             Project: Hadoop Common
          Issue Type: Bug
          Components: conf
    Affects Versions: 0.23.1
            Reporter: Emir Ibrahimbegovic


Consider the following code :

public static void main(String[] args) throws IOException {
        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "zk1.myhost,zk2.myhost,zk3.myhost");
        conf.set("hbase.zookeeper.property.clientPort", "2181");

        InetSocketAddress jobtracker = new InetSocketAddress("jobtracker.mapredhost.myhost",
8021);
        JobClient jobClient = new JobClient(jobtracker, conf);
        JobStatus[] jobs = jobClient.jobsToComplete();

        for (int i = 0; i < jobs.length; i++) {
            JobStatus js = jobs[i];
            if (js.getRunState() == JobStatus.RUNNING) {
                JobID jobId = js.getJobID();
                System.out.println(jobId);
            }
        }
    }

Code above works without errors but if you add this extra line :

System.out.println(jobClient.getJob(jobId).getJobName());

This exception occurs :

Exception in thread "main" java.lang.NullPointerException
	at org.apache.hadoop.mapred.JobClient$NetworkedJob.<init>(JobClient.java:226)
	at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:1080)

Fix is to add set configuration to jobclient again "jobClient.setConf(conf);" even if it was
instantiated using InetSocketAddress and Configuration (see code above).

If you look at line 225 JobClient :

 Configuration conf = JobClient.this.getConf();
      this.completionPollIntervalMillis = conf.getInt(COMPLETION_POLL_INTERVAL_KEY,
          DEFAULT_COMPLETION_POLL_INTERVAL); //NPE occurs here!


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