[TAJO-1024] RpcConnectionPool::getConnection can cause NPE at initialization

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Component/s: QueryMaster, RPC
• Assignee: Hyunsik Choi
• Reporter: Hyunsik Choi
• Created: 02/Sep/14 00:50
• Updated: 15/Sep/14 03:46
• Resolved: 15/Sep/14 03:25

Description

I can see the following NPE exception when I submit the first query after cluster startup. Although the NPE does not abort a running query, it should be fixed.

2014-09-02 09:41:12,925 INFO org.apache.tajo.worker.TajoResourceAllocator: Start TajoWorkerAllocationThread
2014-09-02 09:41:12,970 INFO org.apache.tajo.worker.TajoResourceAllocator: Stop TajoWorkerAllocationThread
2014-09-02 09:41:12,970 INFO org.apache.tajo.master.querymaster.SubQuery: SubQuery (eb_1409618466499_0001_000001) has 3 containers!
2014-09-02 09:41:13,010 ERROR org.apache.tajo.master.ContainerProxy: 
java.lang.NullPointerException
	at org.apache.tajo.rpc.RpcConnectionPool.getConnection(RpcConnectionPool.java:87)
	at org.apache.tajo.master.TajoContainerProxy.assignExecutionBlock(TajoContainerProxy.java:99)
	at org.apache.tajo.master.TajoContainerProxy.launch(TajoContainerProxy.java:70)
	at org.apache.tajo.worker.TajoResourceAllocator$LaunchRunner.run(TajoResourceAllocator.java:170)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
2014-09-02 09:41:13,010 ERROR org.apache.tajo.master.ContainerProxy: 
java.lang.NullPointerException
	at org.apache.tajo.rpc.RpcConnectionPool.getConnection(RpcConnectionPool.java:87)
	at org.apache.tajo.master.TajoContainerProxy.assignExecutionBlock(TajoContainerProxy.java:99)
	at org.apache.tajo.master.TajoContainerProxy.launch(TajoContainerProxy.java:70)
	at org.apache.tajo.worker.TajoResourceAllocator$LaunchRunner.run(TajoResourceAllocator.java:170)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
2014-09-02 09:41:13,031 INFO org.apache.tajo.worker.TaskRunner: Tajo Root Dir: hdfs://localhost:8020/tajo
2014-09-02 09:41:13,031 INFO org.apache.tajo.worker.TaskRunner: Worker Local Dir: /tmp/tajo-hyunsik/tmpdir
2014-09-02 09:41:13,047 INFO org.apache.tajo.worker.TaskRunner: QueryMaster Address:/172.20.10.7:28093
2014-09-02 09:41:13,048 INFO org.apache.tajo.worker.TaskRunnerManager: Start TaskRunner:eb_1409618466499_0001_000001,container_1409618466499_0001_01_000003