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https://issues.apache.org/jira/browse/SPARK-13850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15218850#comment-15218850
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Regan Dvoskin commented on SPARK-13850:
---------------------------------------
We're having a query fail on an inner join of two large HIVE tables with the
same stack trace. The query worked on 1.5, and works on 1.6.0 if
spark.memory.useLegacyMode is true, but fails on 1.6.0 when useLegacyMode is
not enabled.
> TimSort Comparison method violates its general contract
> -------------------------------------------------------
>
> Key: SPARK-13850
> URL: https://issues.apache.org/jira/browse/SPARK-13850
> Project: Spark
> Issue Type: Bug
> Components: Shuffle
> Affects Versions: 1.6.0
> Reporter: Sital Kedia
>
> While running a query which does a group by on a large dataset, the query
> fails with following stack trace.
> {code}
> Job aborted due to stage failure: Task 4077 in stage 1.3 failed 4 times, most
> recent failure: Lost task 4077.3 in stage 1.3 (TID 88702,
> hadoop3030.prn2.facebook.com): java.lang.IllegalArgumentException: Comparison
> method violates its general contract!
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeLo(TimSort.java:794)
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeAt(TimSort.java:525)
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeCollapse(TimSort.java:453)
> at
> org.apache.spark.util.collection.TimSort$SortState.access$200(TimSort.java:325)
> at org.apache.spark.util.collection.TimSort.sort(TimSort.java:153)
> at org.apache.spark.util.collection.Sorter.sort(Sorter.scala:37)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.getSortedIterator(UnsafeInMemorySorter.java:228)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.spill(UnsafeExternalSorter.java:186)
> at
> org.apache.spark.memory.TaskMemoryManager.acquireExecutionMemory(TaskMemoryManager.java:175)
> at
> org.apache.spark.memory.TaskMemoryManager.allocatePage(TaskMemoryManager.java:249)
> at
> org.apache.spark.memory.MemoryConsumer.allocatePage(MemoryConsumer.java:112)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.acquireNewPageIfNecessary(UnsafeExternalSorter.java:318)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.insertRecord(UnsafeExternalSorter.java:333)
> at
> org.apache.spark.sql.execution.UnsafeExternalRowSorter.insertRow(UnsafeExternalRowSorter.java:91)
> at
> org.apache.spark.sql.execution.UnsafeExternalRowSorter.sort(UnsafeExternalRowSorter.java:168)
> at org.apache.spark.sql.execution.Sort$$anonfun$1.apply(Sort.scala:90)
> at org.apache.spark.sql.execution.Sort$$anonfun$1.apply(Sort.scala:64)
> at
> org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$21.apply(RDD.scala:728)
> at
> org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$21.apply(RDD.scala:728)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
> at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)
> at org.apache.spark.scheduler.Task.run(Task.scala:89)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
> 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)
> {code}
> Please note that the same query used to succeed in Spark 1.5 so it seems like
> a regression in 1.6.
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