Emir Ibrahimbegovic created HADOOP-8778:
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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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