[TAJO-1829] Fix DelimitedTextFileAppender NPE in negative tests

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.11.0, 0.12.0
• Fix Version/s: 0.11.0, 0.12.0
• Component/s: Storage
• Assignee: Jinho Kim
• Reporter: Jinho Kim
• Created: 08/Sep/15 14:22
• Updated: 09/Sep/15 04:19
• Resolved: 09/Sep/15 03:51

Description

If initialization is failed, DelimitedTextFileAppender should check null condition

org.apache.tajo.storage.exception.AlreadyExistsStorageException: Error: hdfs://localhost:46021/tmp/tajo-travis/staging/q_1441719763556_0020/RESULT/part-01-000000-000 alreay exists
	at org.apache.tajo.storage.text.DelimitedTextFile$DelimitedTextFileAppender.init(DelimitedTextFile.java:160)
	at org.apache.tajo.engine.planner.physical.StoreTableExec.openNewFile(StoreTableExec.java:119)
	at org.apache.tajo.engine.planner.physical.StoreTableExec.init(StoreTableExec.java:79)
	at org.apache.tajo.worker.TaskImpl.run(TaskImpl.java:401)
	at org.apache.tajo.worker.TaskContainer.run(TaskContainer.java:65)
	at java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
2015-09-08 13:43:27,432 ERROR: org.apache.tajo.worker.TaskContainer (run(70)) - 
java.lang.NullPointerException
	at org.apache.tajo.storage.text.DelimitedTextFile$DelimitedTextFileAppender.flushBuffer(DelimitedTextFile.java:208)
	at org.apache.tajo.storage.text.DelimitedTextFile$DelimitedTextFileAppender.flush(DelimitedTextFile.java:222)
	at org.apache.tajo.engine.planner.physical.StoreTableExec.close(StoreTableExec.java:152)
	at org.apache.tajo.worker.TaskImpl.run(TaskImpl.java:414)
	at org.apache.tajo.worker.TaskContainer.run(TaskContainer.java:65)
	at java.util.concurrent.Executors$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:745)
2015-09-08 13:43:27,433 ERROR: org.apache.tajo.querymaster.TaskAttempt (transition(438)) - ta_1441719763556_0020_000001_000000_02 FROM localhost >> No error message