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https://issues.apache.org/jira/browse/SPARK-22371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292134#comment-16292134
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Mayank Agarwal edited comment on SPARK-22371 at 12/15/17 9:01 AM:
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Hi, Sorry for late reply.
>From our analysis this error seems to come when there are jobs running
>parallel on datasets and union of all those datasets and Full GC triggered at
>same time which clears the accumulate of children dataset of union.
I am attaching a small program from which this error comes frequently.
[^ShuffleIssue.java]
[^Helper.scala]
[^sampledata]
Steps for generating sample data
{code:title=UNIX COMMAND |borderStyle=solid}
for((i=1472428800;i<=1472947200;i=i+86400));do mkdir -p
output/testdata/eventtime=$i;cp sampledata
output/testdata/eventtime=$i/000001_0;cp sampledata
output/testdata/eventtime=$i/000001_1;cp sampledata
output/testdata/eventtime=$i/000001_2;cp sampledata
output/testdata/eventtime=$i/000001_3;done
{code}
was (Author: mayank.agarwal2305):
Hi, Sorry for late reply.
>From our analysis this error seems to come when there are jobs running
>parallel on datasets and union of all those datasets and Full GC triggered at
>same time which clears the accumulate of children dataset of union.
I am attaching a small program from which this error comes frequently.
[^ShuffleIssue.java]
[^Helper.scala]
[^sampledata]
Steps for generating sample data
{code:title=Bar.java|borderStyle=solid}
for((i=1472428800;i<=1472947200;i=i+86400));do mkdir -p
output/testdata/eventtime=$i;cp sampledata
output/testdata/eventtime=$i/000001_0;cp sampledata
output/testdata/eventtime=$i/000001_1;cp sampledata
output/testdata/eventtime=$i/000001_2;cp sampledata
output/testdata/eventtime=$i/000001_3;done
{code}
> dag-scheduler-event-loop thread stopped with error Attempted to access
> garbage collected accumulator 5605982
> -------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-22371
> URL: https://issues.apache.org/jira/browse/SPARK-22371
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.0
> Reporter: Mayank Agarwal
> Attachments: Helper.scala, ShuffleIssue.java,
> driver-thread-dump-spark2.1.txt, sampledata
>
>
> Our Spark Jobs are getting stuck on DagScheduler.runJob as dagscheduler
> thread is stopped because of *Attempted to access garbage collected
> accumulator 5605982*.
> from our investigation it look like accumulator is cleaned by GC first and
> same accumulator is used for merging the results from executor on task
> completion event.
> As the error java.lang.IllegalAccessError is LinkageError which is treated as
> FatalError so dag-scheduler loop is finished with below exception.
> ---ERROR stack trace --
> Exception in thread "dag-scheduler-event-loop" java.lang.IllegalAccessError:
> Attempted to access garbage collected accumulator 5605982
> at
> org.apache.spark.util.AccumulatorContext$$anonfun$get$1.apply(AccumulatorV2.scala:253)
> at
> org.apache.spark.util.AccumulatorContext$$anonfun$get$1.apply(AccumulatorV2.scala:249)
> at scala.Option.map(Option.scala:146)
> at
> org.apache.spark.util.AccumulatorContext$.get(AccumulatorV2.scala:249)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$updateAccumulators$1.apply(DAGScheduler.scala:1083)
> at
> org.apache.spark.scheduler.DAGScheduler$$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)
> I am attaching the thread dump of driver as well
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