Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4835#issuecomment-76546964
That's a legitimate test failure caused by a new assertion that I added
here (being extra defensive about avoiding duplicate accumulator registration,
since this might cause silent data loss):
```
Job aborted due to stage failure: Task 0 in stage 6.0 failed 1 times, most
recent failure: Lost task 0.0 in stage 6.0 (TID 4, localhost):
java.io.IOException: java.lang.IllegalArgumentException: requirement failed:
Accumulator 2 has already been registered at
org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1165) at
org.apache.spark.Accumulable.readObject(Accumulators.scala:133) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606) at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893) at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at java.io.O
bjectInputStream.defaultReadFields(ObjectInputStream.java:1990) at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915) at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990) at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915) at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990) at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915) at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990) at
java.io.ObjectInputStream.rea
dSerialData(ObjectInputStream.java:1915) at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990) at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915) at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370) at
```
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