[ 
https://issues.apache.org/jira/browse/HIVE-18301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

liyunzhang reassigned HIVE-18301:
---------------------------------


> Investigate to enable MapInput cache in Hive on Spark
> -----------------------------------------------------
>
>                 Key: HIVE-18301
>                 URL: https://issues.apache.org/jira/browse/HIVE-18301
>             Project: Hive
>          Issue Type: Bug
>            Reporter: liyunzhang
>            Assignee: liyunzhang
>
> Before IOContext problem is found in MapTran when spark rdd cache is enabled 
> in HIVE-8920.
> so we disabled rdd cache in MapTran at 
> [SparkPlanGenerator|https://github.com/kellyzly/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlanGenerator.java#L202].
>   The problem is IOContext seems not initialized well in the spark yarn 
> client/cluster mode and caused the exception like
> {code}
> Job aborted due to stage failure: Task 93 in stage 0.0 failed 4 times, most 
> recent failure: Lost task 93.3 in stage 0.0 (TID 616, bdpe48): 
> java.lang.RuntimeException: Error processing row: 
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.hive.ql.exec.spark.SparkMapRecordHandler.processRow(SparkMapRecordHandler.java:165)
>       at 
> org.apache.hadoop.hive.ql.exec.spark.HiveMapFunctionResultList.processNextRecord(HiveMapFunctionResultList.java:48)
>       at 
> org.apache.hadoop.hive.ql.exec.spark.HiveMapFunctionResultList.processNextRecord(HiveMapFunctionResultList.java:27)
>       at 
> org.apache.hadoop.hive.ql.exec.spark.HiveBaseFunctionResultList.hasNext(HiveBaseFunctionResultList.java:85)
>       at 
> scala.collection.convert.Wrappers$JIteratorWrapper.hasNext(Wrappers.scala:42)
>       at 
> org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:125)
>       at 
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:79)
>       at 
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:47)
>       at org.apache.spark.scheduler.Task.run(Task.scala:85)
>       at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hadoop.hive.ql.exec.AbstractMapOperator.getNominalPath(AbstractMapOperator.java:101)
>       at 
> org.apache.hadoop.hive.ql.exec.MapOperator.cleanUpInputFileChangedOp(MapOperator.java:516)
>       at 
> org.apache.hadoop.hive.ql.exec.Operator.cleanUpInputFileChanged(Operator.java:1187)
>       at 
> org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:546)
>       at 
> org.apache.hadoop.hive.ql.exec.spark.SparkMapRecordHandler.processRow(SparkMapRecordHandler.java:152)
>       ... 12 more
> Driver stacktrace:
> {code}



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