Sergey Zhemzhitsky created SPARK-20404:
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Summary: 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: 2.1.0, 2.0.2, 2.0.1, 2.0.0
Reporter: Sergey Zhemzhitsky
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.
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