Github user wangyum commented on the issue:
https://github.com/apache/spark/pull/18343
@viirya Yes, I' using `org.apache.spark.serializer.KryoSerializer`, [master
branch](https://github.com/apache/spark/tree/ce49428ef7d640c1734e91ffcddc49dbc8547ba7)
still has this issue, error logs:
```
17/06/19 12:24:05 ERROR Utils: Exception encountered
java.lang.NullPointerException
at
org.apache.spark.scheduler.HighlyCompressedMapStatus$$anonfun$writeExternal$2.apply$mcV$sp(MapStatus.scala:171)
at
org.apache.spark.scheduler.HighlyCompressedMapStatus$$anonfun$writeExternal$2.apply(MapStatus.scala:167)
at
org.apache.spark.scheduler.HighlyCompressedMapStatus$$anonfun$writeExternal$2.apply(MapStatus.scala:167)
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1306)
at
org.apache.spark.scheduler.HighlyCompressedMapStatus.writeExternal(MapStatus.scala:167)
at
java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1459)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1430)
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at
java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1378)
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at
org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply$mcV$sp(MapOutputTracker.scala:728)
at
org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:727)
at
org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:727)
at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1340)
at
org.apache.spark.MapOutputTracker$.serializeMapStatuses(MapOutputTracker.scala:730)
at
org.apache.spark.ShuffleStatus.serializedMapStatus(MapOutputTracker.scala:171)
at
org.apache.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:389)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
17/06/19 12:24:05 ERROR MapOutputTrackerMaster:
java.lang.NullPointerException
java.io.IOException: java.lang.NullPointerException
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1313)
at
org.apache.spark.scheduler.HighlyCompressedMapStatus.writeExternal(MapStatus.scala:167)
at
java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1459)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1430)
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at
java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1378)
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at
org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply$mcV$sp(MapOutputTracker.scala:728)
at
org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:727)
at
org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:727)
at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1340)
at
org.apache.spark.MapOutputTracker$.serializeMapStatuses(MapOutputTracker.scala:730)
at
org.apache.spark.ShuffleStatus.serializedMapStatus(MapOutputTracker.scala:171)
at
org.apache.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:389)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at
org.apache.spark.scheduler.HighlyCompressedMapStatus$$anonfun$writeExternal$2.apply$mcV$sp(MapStatus.scala:171)
at
org.apache.spark.scheduler.HighlyCompressedMapStatus$$anonfun$writeExternal$2.apply(MapStatus.scala:167)
at
org.apache.spark.scheduler.HighlyCompressedMapStatus$$anonfun$writeExternal$2.apply(MapStatus.scala:167)
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1306)
... 17 more
```
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