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https://issues.apache.org/jira/browse/SPARK-13210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960414#comment-15960414
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Sean Owen commented on SPARK-13210:
-----------------------------------
For anyone seeing this exception, can you run with assertions on ({{-ea}})? I
can't see a way this happens unless the page in the page table is null, and the
code is asserting it's impossible, at least in master. If that's not true that
much has to be investigated.
> NPE in Sort
> -----------
>
> Key: SPARK-13210
> URL: https://issues.apache.org/jira/browse/SPARK-13210
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.0, 2.0.0
> Reporter: Davies Liu
> Assignee: Davies Liu
> Priority: Critical
> Fix For: 1.6.1, 2.0.0
>
>
> When run TPCDS query Q78 with scale 10:
> {code}
> 16/02/04 22:39:09 ERROR Executor: Managed memory leak detected; size =
> 268435456 bytes, TID = 143
> 16/02/04 22:39:09 ERROR Executor: Exception in task 0.0 in stage 47.0 (TID
> 143)
> java.lang.NullPointerException
> at
> org.apache.spark.memory.TaskMemoryManager.getPage(TaskMemoryManager.java:333)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter$SortComparator.compare(UnsafeInMemorySorter.java:60)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter$SortComparator.compare(UnsafeInMemorySorter.java:39)
> at
> org.apache.spark.util.collection.TimSort.countRunAndMakeAscending(TimSort.java:270)
> at org.apache.spark.util.collection.TimSort.sort(TimSort.java:142)
> at org.apache.spark.util.collection.Sorter.sort(Sorter.scala:37)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.getSortedIterator(UnsafeInMemorySorter.java:239)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.getSortedIterator(UnsafeExternalSorter.java:415)
> at
> org.apache.spark.sql.execution.UnsafeExternalRowSorter.sort(UnsafeExternalRowSorter.java:116)
> at
> org.apache.spark.sql.execution.UnsafeExternalRowSorter.sort(UnsafeExternalRowSorter.java:168)
> at org.apache.spark.sql.execution.Sort$$anonfun$1.apply(Sort.scala:87)
> at org.apache.spark.sql.execution.Sort$$anonfun$1.apply(Sort.scala:60)
> at
> org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$23.apply(RDD.scala:735)
> at
> org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$23.apply(RDD.scala:735)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:313)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:277)
> at
> org.apache.spark.rdd.ZippedPartitionsRDD2.compute(ZippedPartitionsRDD.scala:88)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:313)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:277)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:313)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:277)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:313)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:277)
> at
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:77)
> at
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:45)
> at org.apache.spark.scheduler.Task.run(Task.scala:81)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
> 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)
> {code}
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