GitHub user wangyum opened a pull request: https://github.com/apache/spark/pull/18343
[SPARK-21133][CORE] Fix HighlyCompressedMapStatus#writeExternal throws NPE ## What changes were proposed in this pull request? Fix HighlyCompressedMapStatus#writeExternal NPE: ``` 17/06/18 15:00:27 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$$anonfun$writeExternal$2.apply(MapStatus.scala:167) at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1303) at org.apache.spark.scheduler.HighlyCompressedMapStatus.writeExternal(MapStatus.scala:167) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1459) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1430) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1378) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply$mcV$sp(MapOutputTracker.scala:617) at org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:616) at org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:616) at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1337) at org.apache.spark.MapOutputTracker$.serializeMapStatuses(MapOutputTracker.scala:619) at org.apache.spark.MapOutputTrackerMaster.getSerializedMapOutputStatuses(MapOutputTracker.scala:562) at org.apache.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:351) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) 17/06/18 15:00:27 ERROR MapOutputTrackerMaster: java.lang.NullPointerException java.io.IOException: java.lang.NullPointerException at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1310) 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$$anonfun$serializeMapStatuses$1.apply$mcV$sp(MapOutputTracker.scala:617) at org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:616) at org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:616) at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1337) at org.apache.spark.MapOutputTracker$.serializeMapStatuses(MapOutputTracker.scala:619) at org.apache.spark.MapOutputTrackerMaster.getSerializedMapOutputStatuses(MapOutputTracker.scala:562) at org.apache.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:351) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException at org.apache.spark.scheduler.HighlyCompressedMapStatus$$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:1303) ... 17 more 17/06/18 15:00:27 INFO MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 10.17.47.20:50188 17/06/18 15:00:27 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$$anonfun$writeExternal$2.apply(MapStatus.scala:167) at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1303) at org.apache.spark.scheduler.HighlyCompressedMapStatus.writeExternal(MapStatus.scala:167) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1459) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1430) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1378) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply$mcV$sp(MapOutputTracker.scala:617) at org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:616) at org.apache.spark.MapOutputTracker$$anonfun$serializeMapStatuses$1.apply(MapOutputTracker.scala:616) at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1337) at org.apache.spark.MapOutputTracker$.serializeMapStatuses(MapOutputTracker.scala:619) at org.apache.spark.MapOutputTrackerMaster.getSerializedMapOutputStatuses(MapOutputTracker.scala:562) at org.apache.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:351) 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) ``` ## How was this patch tested? manual tests You can merge this pull request into a Git repository by running: $ git pull https://github.com/wangyum/spark SPARK-21133 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/18343.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #18343 ---- commit 4cf353259484a419c9edc5f50f1627b1a88d3b10 Author: Yuming Wang <wgy...@gmail.com> Date: 2017-06-18T07:34:57Z Fix HighlyCompressedMapStatus#writeExternal throws NPE ---- --- If your project is set up for it, you can reply to this email and have your reply appear on 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