[jira] [Created] (SPARK-22612) NullPointerException in AppendOnlyMap

["Lijie Xu (JIRA)" <ji...@apache.org>]

Lijie Xu created SPARK-22612:
--------------------------------

             Summary: NullPointerException in AppendOnlyMap
                 Key: SPARK-22612
                 URL: https://issues.apache.org/jira/browse/SPARK-22612
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.1.2, 2.1.1
            Reporter: Lijie Xu


I recently encounter a NullPointerException in AppendOnlyMap while running the SparkPageRank example in the package org.apache.spark.examples.

{code:java}
17/11/25 16:31:13 ERROR Executor: Exception in task 30.0 in stage 10.0 (TID 417)
java.lang.NullPointerException
	at scala.Tuple2.equals(Tuple2.scala:20)
	at org.apache.spark.util.collection.AppendOnlyMap.changeValue(AppendOnlyMap.scala:149)
	at org.apache.spark.util.collection.SizeTrackingAppendOnlyMap.changeValue(SizeTrackingAppendOnlyMap.scala:32)
	at org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:194)
	at org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:63)
	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:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:322)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
17/11/25 16:31:13 INFO Executor: Executor is trying to kill task 24.0 in stage 10.0 (TID 409)
{code}

The corresponding AppendOnlyMap code is as follows.

{code:java}
 while (true) {
      val curKey = data(2 * pos)
      if (curKey.eq(null)) {
        val newValue = updateFunc(false, null.asInstanceOf[V])
        data(2 * pos) = k
        data(2 * pos + 1) = newValue.asInstanceOf[AnyRef]
        incrementSize()
        return newValue
      } else if (k.eq(curKey) || k.equals(curKey)) {   // NullPointerException in this line (149)
        val newValue = updateFunc(true, data(2 * pos + 1).asInstanceOf[V])
        data(2 * pos + 1) = newValue.asInstanceOf[AnyRef]
        return newValue
      } else {
        val delta = i
        pos = (pos + delta) & mask
        i += 1
      }
    }
{code}









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