[TAJO-645] Task.Reporter can cause NPE during reporting.

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.8.0, 0.9.0
• Fix Version/s: 0.8.0, 0.9.0
• Component/s: Worker
• Assignee: Hyunsik Choi
• Reporter: Hyunsik Choi
• Created: 03/Mar/14 10:56
• Updated: 04/Mar/14 00:16
• Resolved: 03/Mar/14 23:13

Description

See the title. This problem causes the following error messages.

014-03-03 19:52:27,680 ERROR worker.Task (Task.java:run(687)) - 
java.lang.NullPointerException
	at org.apache.tajo.worker.Task$Reporter$1.run(Task.java:681)
	at java.lang.Thread.run(Thread.java:724)
2014-03-03 19:52:27,689 INFO  worker.Task (Task.java:<init>(181)) - Output File Path: hdfs://localhost:52744/tmp/tajo-hyunsik/staging/q_1393843945346_0001/RESULT/part-01-000000

The main cause is to start the report thread in Task before this.context is initialized as follows:

    this.reporter = new Reporter(taskId, masterProxy);
    this.reporter.startCommunicationThread();
    ...
    this.context = new TaskAttemptContext(systemConf, taskId,
        request.getFragments().toArray(new FragmentProto[request.getFragments().size()]), taskDir);