[HIVE-18301] Investigate to enable MapInput cache in Hive on Spark

• Type: Bug
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Assignee: liyunzhang
• Reporter: liyunzhang
• Created: 19/Dec/17 05:26
• Updated: 02/Feb/18 09:59

Description

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. The problem is IOContext seems not initialized correctly in the spark yarn client/cluster mode and caused the exception like

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:

in yarn client/cluster mode, sometimes ExecMapperContext#currentInputPath is null when rdd cach is enabled.

Issue Links

• blocks: HIVE-17486 Enable SharedWorkOptimizer in tez on HOS