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https://issues.apache.org/jira/browse/SPARK-21907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16160366#comment-16160366
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Eyal Farago commented on SPARK-21907:
-------------------------------------
opened PR: https://github.com/apache/spark/pull/19181
> NullPointerException in UnsafeExternalSorter.spill()
> ----------------------------------------------------
>
> Key: SPARK-21907
> URL: https://issues.apache.org/jira/browse/SPARK-21907
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.2.0
> Reporter: Juliusz Sompolski
>
> I see NPE during sorting with the following stacktrace:
> {code}
> java.lang.NullPointerException
> at
> org.apache.spark.memory.TaskMemoryManager.getPage(TaskMemoryManager.java:383)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter$SortComparator.compare(UnsafeInMemorySorter.java:63)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter$SortComparator.compare(UnsafeInMemorySorter.java:43)
> 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:345)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.spill(UnsafeExternalSorter.java:206)
> at
> org.apache.spark.memory.TaskMemoryManager.acquireExecutionMemory(TaskMemoryManager.java:203)
> at
> org.apache.spark.memory.TaskMemoryManager.allocatePage(TaskMemoryManager.java:281)
> at
> org.apache.spark.memory.MemoryConsumer.allocateArray(MemoryConsumer.java:90)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.reset(UnsafeInMemorySorter.java:173)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.spill(UnsafeExternalSorter.java:221)
> at
> org.apache.spark.memory.TaskMemoryManager.acquireExecutionMemory(TaskMemoryManager.java:203)
> at
> org.apache.spark.memory.TaskMemoryManager.allocatePage(TaskMemoryManager.java:281)
> at
> org.apache.spark.memory.MemoryConsumer.allocateArray(MemoryConsumer.java:90)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.growPointerArrayIfNecessary(UnsafeExternalSorter.java:349)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.insertRecord(UnsafeExternalSorter.java:400)
> at
> org.apache.spark.sql.execution.UnsafeExternalRowSorter.insertRow(UnsafeExternalRowSorter.java:109)
> at
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.sort_addToSorter$(Unknown
> Source)
> at
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(Unknown
> Source)
> at
> org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
> at
> org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$8$$anon$1.hasNext(WholeStageCodegenExec.scala:395)
> at
> org.apache.spark.sql.execution.RowIteratorFromScala.advanceNext(RowIterator.scala:83)
> at
> org.apache.spark.sql.execution.joins.SortMergeJoinScanner.advancedStreamed(SortMergeJoinExec.scala:778)
> at
> org.apache.spark.sql.execution.joins.SortMergeJoinScanner.findNextInnerJoinRows(SortMergeJoinExec.scala:685)
> at
> org.apache.spark.sql.execution.joins.SortMergeJoinExec$$anonfun$doExecute$1$$anon$2.advanceNext(SortMergeJoinExec.scala:259)
> at
> org.apache.spark.sql.execution.RowIteratorToScala.hasNext(RowIterator.scala:68)
> at
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.agg_doAggregateWithKeys$(Unknown
> Source)
> at
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(Unknown
> Source)
> at
> org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
> at
> org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$8$$anon$1.hasNext(WholeStageCodegenExec.scala:395)
> at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
> at
> org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:125)
> at
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:96)
> at
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:53)
> at org.apache.spark.scheduler.Task.run(Task.scala:108)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:346)
> 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:748)
> {code}
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