hivejoin空指針異常的示例分析
小編給大家分享一下hive join空指針異常的示例分析，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
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2015-07-28 10:03:21,557 Stage-2 map = 100%, reduce = 0% Ended Job = job_1437720498561_1035 with errors Error during job, obtaining debugging information... Examining task ID: task_1437720498561_1035_m_000000 (and more) from job job_1437720498561_1035 Task with the most failures(4): ----- Task ID: task_1437720498561_1035_m_000000 URL: http://0.0.0.0:8088/taskdetails.jsp?jobid=job_1437720498561_1035&tipid=task_1437720498561_1035_m_000000 ----- Diagnostic Messages for this Task: Error: java.lang.RuntimeException: java.lang.NullPointerException at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:172) at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158) Caused by: java.lang.NullPointerException at org.apache.hadoop.hive.ql.exec.MapJoinOperator.loadHashTable(MapJoinOperator.java:286) at org.apache.hadoop.hive.ql.exec.MapJoinOperator.cleanUpInputFileChangedOp(MapJoinOperator.java:313) at org.apache.hadoop.hive.ql.exec.Operator.cleanUpInputFileChanged(Operator.java:1069) at org.apache.hadoop.hive.ql.exec.Operator.cleanUpInputFileChanged(Operator.java:1073) at org.apache.hadoop.hive.ql.exec.Operator.cleanUpInputFileChanged(Operator.java:1073) at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:501) at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:163) ... 8 more FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
hive join 操作時(shí)若發(fā)生NullPointerException，請(qǐng)執(zhí)行 set hive.auto.convert.join=false;
如設(shè)置hive.auto.convert.join的值為true，hive將在表的大小符合設(shè)置時(shí)自動(dòng)使用MapJoin
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