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https://issues.apache.org/jira/browse/HIVE-6537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13918472#comment-13918472
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Sergey Shelukhin commented on HIVE-6537:
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[~navis] [~vikram.dixit] fyi
> NullPointerException when loading hashtable for MapJoin directly
> ----------------------------------------------------------------
>
> Key: HIVE-6537
> URL: https://issues.apache.org/jira/browse/HIVE-6537
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-6537.patch
>
>
> We see the following error:
> {noformat}
> 2014-02-20 23:33:15,743 FATAL [main]
> org.apache.hadoop.hive.ql.exec.mr.ExecMapper:
> org.apache.hadoop.hive.ql.metadata.HiveException:
> java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.exec.mr.HashTableLoader.load(HashTableLoader.java:103)
> at
> org.apache.hadoop.hive.ql.exec.MapJoinOperator.loadHashTable(MapJoinOperator.java:149)
> at
> org.apache.hadoop.hive.ql.exec.MapJoinOperator.cleanUpInputFileChangedOp(MapJoinOperator.java:164)
> at
> org.apache.hadoop.hive.ql.exec.Operator.cleanUpInputFileChanged(Operator.java:1026)
> at
> org.apache.hadoop.hive.ql.exec.Operator.cleanUpInputFileChanged(Operator.java:1030)
> at
> org.apache.hadoop.hive.ql.exec.Operator.cleanUpInputFileChanged(Operator.java:1030)
> at
> org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:489)
> at
> org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:177)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:430)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:342)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:163)
> Caused by: java.lang.NullPointerException
> at java.util.Arrays.fill(Arrays.java:2685)
> at
> org.apache.hadoop.hive.ql.exec.mr.HashTableLoader.loadDirectly(HashTableLoader.java:155)
> at
> org.apache.hadoop.hive.ql.exec.mr.HashTableLoader.load(HashTableLoader.java:81)
> ... 15 more
> {noformat}
> It appears that the tables in Arrays.fill call is nulls. I don't really have
> full understanding of this path, but what I gleaned so far is this...
> From what I see, tables would be set unconditionally in initializeOp of the
> sink, and in no other place, so I assume for this code to ever work that
> startForward calls it at least some time.
> Here, it doesn't call it, so it's null.
> Previous loop also uses tables, and should have NPE-d before fill was ever
> called; it didn't, so I'd assume it never executed.
> There's a little bit of inconsistency in the above code where directWorks are
> added to parents unconditionally but sink is only added as child
> conditionally. I think it may be that some of the direct works are not table
> scans; in fact given that loop never executes they may be null (which is
> rather strange).
> Regardless, it seems that the logic should be fixed, it may be the root cause
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