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https://issues.apache.org/jira/browse/HIVE-9104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14272299#comment-14272299
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Xuefu Zhang commented on HIVE-9104:
-----------------------------------
[~csun] Could you add a test case in which perhaps the same query runs with
multiple reducers. It can be in the same .q file.
> windowing.q failed when mapred.reduce.tasks is set to larger than one
> ---------------------------------------------------------------------
>
> Key: HIVE-9104
> URL: https://issues.apache.org/jira/browse/HIVE-9104
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Chao
> Assignee: Chao
> Attachments: HIVE-9104.patch
>
>
> Test {{windowing.q}} is actually not enabled in Spark branch - in test
> configurations it is {{windowing.q.q}}.
> I just run this test, and query
> {code}
> -- 12. testFirstLastWithWhere
> select p_mfgr,p_name, p_size,
> rank() over(distribute by p_mfgr sort by p_name) as r,
> sum(p_size) over (distribute by p_mfgr sort by p_name rows between current
> row and current row) as s2,
> first_value(p_size) over w1 as f,
> last_value(p_size, false) over w1 as l
> from part
> where p_mfgr = 'Manufacturer#3'
> window w1 as (distribute by p_mfgr sort by p_name rows between 2 preceding
> and 2 following);
> {code}
> failed with the following exception:
> {noformat}
> java.lang.RuntimeException: Hive Runtime Error while closing operators: null
> at
> org.apache.hadoop.hive.ql.exec.spark.SparkReduceRecordHandler.close(SparkReduceRecordHandler.java:446)
> at
> org.apache.hadoop.hive.ql.exec.spark.HiveReduceFunctionResultList.closeRecordProcessor(HiveReduceFunctionResultList.java:58)
> at
> org.apache.hadoop.hive.ql.exec.spark.HiveBaseFunctionResultList$ResultIterator.hasNext(HiveBaseFunctionResultList.java:108)
> at
> scala.collection.convert.Wrappers$JIteratorWrapper.hasNext(Wrappers.scala:41)
> at scala.collection.Iterator$class.foreach(Iterator.scala:727)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
> at
> org.apache.spark.rdd.AsyncRDDActions$$anonfun$foreachAsync$2.apply(AsyncRDDActions.scala:115)
> at
> org.apache.spark.rdd.AsyncRDDActions$$anonfun$foreachAsync$2.apply(AsyncRDDActions.scala:115)
> at org.apache.spark.SparkContext$$anonfun$30.apply(SparkContext.scala:1390)
> at org.apache.spark.SparkContext$$anonfun$30.apply(SparkContext.scala:1390)
> at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:61)
> at org.apache.spark.scheduler.Task.run(Task.scala:56)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:196)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.NoSuchElementException
> at java.util.ArrayDeque.getFirst(ArrayDeque.java:318)
> at
> org.apache.hadoop.hive.ql.udf.generic.GenericUDAFFirstValue$FirstValStreamingFixedWindow.terminate(GenericUDAFFirstValue.java:290)
> at
> org.apache.hadoop.hive.ql.udf.ptf.WindowingTableFunction.finishPartition(WindowingTableFunction.java:413)
> at
> org.apache.hadoop.hive.ql.exec.PTFOperator$PTFInvocation.finishPartition(PTFOperator.java:337)
> at org.apache.hadoop.hive.ql.exec.PTFOperator.closeOp(PTFOperator.java:95)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:598)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:610)
> at
> org.apache.hadoop.hive.ql.exec.spark.SparkReduceRecordHandler.close(SparkReduceRecordHandler.java:431)
> ... 15 more
> {noformat}
> We need to find out:
> - Since which commit this test started failing, and
> - Why it fails
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