[TAJO-1549] NPE avoidance on makeStageHistory Function in Stage.java

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 0.11.0
• Component/s: QueryMaster
• Assignee: Unassigned
• Reporter: Jihun Kang
• Created: 13/Apr/15 01:30
• Updated: 13/Apr/15 01:46
• Resolved: 13/Apr/15 01:46

Description

There are some possibility on NPE in makeStageHistory function. It is not a quite big issue on Tajo Cluster, but it could be lessened error logs.

java.lang.NullPointerException
	at org.apache.tajo.querymaster.Stage.makeStageHistory(Stage.java:471)
	at org.apache.tajo.querymaster.Stage.getStageHistory(Stage.java:445)
	at org.apache.tajo.querymaster.Query.makeStageHistories(Query.java:295)
	at org.apache.tajo.querymaster.Query.getQueryHistory(Query.java:288)
	at org.apache.tajo.querymaster.QueryMaster$QueryMasterContext.stopQuery(QueryMaster.java:369)
	at org.apache.tajo.querymaster.QueryMaster$QueryStopEventHandler.handle(QueryMaster.java:425)
	at org.apache.tajo.querymaster.QueryMaster$QueryStopEventHandler.handle(QueryMaster.java:422)
	at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:173)
	at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:106)
	at java.lang.Thread.run(Thread.java:701)

Issue Links

• duplicates: TAJO-1522 NPE making stage history before task scheduler is initialized