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https://issues.apache.org/jira/browse/TAJO-1549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jihun Kang resolved TAJO-1549.
------------------------------
Resolution: Duplicate
> NPE avoidance on makeStageHistory Function in Stage.java
> --------------------------------------------------------
>
> Key: TAJO-1549
> URL: https://issues.apache.org/jira/browse/TAJO-1549
> Project: Tajo
> Issue Type: Bug
> Components: query master
> Affects Versions: 0.11.0
> Reporter: Jihun Kang
> Priority: Minor
>
> 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.
> {code}
> 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)
> {code}
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