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https://issues.apache.org/jira/browse/SPARK-20404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15980901#comment-15980901
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Sergey Zhemzhitsky commented on SPARK-20404:
--------------------------------------------
[~srowen]
Here it is: https://github.com/apache/spark/pull/17740
> Regression with accumulator names when migrating from 1.6 to 2.x
> ----------------------------------------------------------------
>
> Key: SPARK-20404
> URL: https://issues.apache.org/jira/browse/SPARK-20404
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.0.0, 2.0.1, 2.0.2, 2.1.0
> Environment: Spark: 2.1
> Scala: 2.11
> Spark master: local
> Reporter: Sergey Zhemzhitsky
> Attachments: spark-context-accum-option.patch
>
>
> Creating accumulator with explicitly specified name equal to _null_, like the
> following
> {code:java}
> sparkContext.accumulator(0, null)
> {code}
> throws exception at runtime
> {code:none}
> ERROR | DAGScheduler | dag-scheduler-event-loop | Failed to update
> accumulators for task 0
> java.lang.NullPointerException
> at
> org.apache.spark.util.AccumulatorV2$$anonfun$1.apply(AccumulatorV2.scala:106)
> at
> org.apache.spark.util.AccumulatorV2$$anonfun$1.apply(AccumulatorV2.scala:106)
> at scala.Option.exists(Option.scala:240)
> at org.apache.spark.util.AccumulatorV2.toInfo(AccumulatorV2.scala:106)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$updateAccumulators$1.apply(DAGScheduler.scala:1091)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$updateAccumulators$1.apply(DAGScheduler.scala:1080)
> at
> scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
> at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
> at
> org.apache.spark.scheduler.DAGScheduler.updateAccumulators(DAGScheduler.scala:1080)
> at
> org.apache.spark.scheduler.DAGScheduler.handleTaskCompletion(DAGScheduler.scala:1183)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGScheduler.scala:1647)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1605)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1594)
> at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48)
> {code}
> The issue is in wrapping name into _Some_ instead of _Option_ when creating
> accumulators.
> Patch is available.
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