Hi,

We are encountering java OptionalDataException in one of our spark jobs.
All the tasks of a stage passes (or atleast we do not see any error), but stage 
fails with above exception while getting task result.
And and this exception gets printed on driver.

Any pointers in this regard would be helpful.

Here is the stack-trace:

java.io.OptionalDataException
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1555)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
    at 
scala.collection.mutable.HashMap$$anonfun$readObject$1.apply(HashMap.scala:174)
    at 
scala.collection.mutable.HashMap$$anonfun$readObject$1.apply(HashMap.scala:174)
    at scala.collection.mutable.HashTable$class.init(HashTable.scala:109)
    at scala.collection.mutable.HashMap.init(HashMap.scala:40)
    at scala.collection.mutable.HashMap.readObject(HashMap.scala:174)
    at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1058)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2136)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2027)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2245)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2169)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2027)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
    at 
org.apache.spark.scheduler.DirectTaskResult$$anonfun$readExternal$1$$anonfun$apply$mcV$sp$2.apply(TaskResult.scala:67)
    at 
org.apache.spark.scheduler.DirectTaskResult$$anonfun$readExternal$1$$anonfun$apply$mcV$sp$2.apply(TaskResult.scala:66)
    at scala.collection.immutable.Range.foreach(Range.scala:160)
    at 
org.apache.spark.scheduler.DirectTaskResult$$anonfun$readExternal$1.apply$mcV$sp(TaskResult.scala:66)
    at 
org.apache.spark.scheduler.DirectTaskResult$$anonfun$readExternal$1.apply(TaskResult.scala:55)
    at 
org.apache.spark.scheduler.DirectTaskResult$$anonfun$readExternal$1.apply(TaskResult.scala:55)
    at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1326)
    at 
org.apache.spark.scheduler.DirectTaskResult.readExternal(TaskResult.scala:55)
    at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:2076)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2025)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
    at 
org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:75)
    at 
org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:108)
    at 
org.apache.spark.scheduler.TaskResultGetter$$anon$3$$anonfun$run$1.apply$mcV$sp(TaskResultGetter.scala:64)
    at 
org.apache.spark.scheduler.TaskResultGetter$$anon$3$$anonfun$run$1.apply(TaskResultGetter.scala:63)
    at 
org.apache.spark.scheduler.TaskResultGetter$$anon$3$$anonfun$run$1.apply(TaskResultGetter.scala:63)
    at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1945)
    at 
org.apache.spark.scheduler.TaskResultGetter$$anon$3.run(TaskResultGetter.scala:62)
    at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

Thanks

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Ravi Aggarwal
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E11-355
Computer Scientist
669.214.1491 (cell)
San Jose, CA, 95110, US
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