Github user staple commented on the pull request:
https://github.com/apache/spark/pull/1592#issuecomment-54703009
Sorry for the delay. I wrote a simple test case in pyspark to trigger the
kryo NPEs I've started seeing, that doesn't require my patch. I tested against
master at ba5bcaddecd54811d45c5fc79a013b3857d4c633.
from pyspark.sql import Row, SQLContext
OneField = Row('f1')
rdd = sc.parallelize( [ OneField( ['x'] ) ] )
sqlCtx = SQLContext(sc)
srdd = sqlCtx.inferSchema(rdd)
srdd._jschema_rdd.collect()
The kryo NPE is coming from the TaskResultGetter:
14/09/05 21:59:47 ERROR TaskResultGetter: Exception while getting task
result
com.esotericsoftware.kryo.KryoException: java.lang.NullPointerException
Serialization trace:
underlying (scala.collection.convert.Wrappers$JListWrapper)
values (org.apache.spark.sql.catalyst.expressions.GenericRow)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:626)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:729)
at
com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.read(DefaultArraySerializers.java:338)
at
com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.read(DefaultArraySerializers.java:293)
at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:648)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:605)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:729)
at
com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.read(DefaultArraySerializers.java:338)
at
com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.read(DefaultArraySerializers.java:293)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:729)
at
org.apache.spark.serializer.KryoSerializerInstance.deserialize(KryoSerializer.scala:162)
at
org.apache.spark.scheduler.DirectTaskResult.value(TaskResult.scala:79)
at
org.apache.spark.scheduler.TaskSetManager.handleSuccessfulTask(TaskSetManager.scala:514)
at
org.apache.spark.scheduler.TaskSchedulerImpl.handleSuccessfulTask(TaskSchedulerImpl.scala:355)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply$mcV$sp(TaskResultGetter.scala:68)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply(TaskResultGetter.scala:47)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply(TaskResultGetter.scala:47)
at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1276)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2.run(TaskResultGetter.scala:46)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:701)
Caused by: java.lang.NullPointerException
at
scala.collection.convert.Wrappers$MutableBufferWrapper.add(Wrappers.scala:80)
at
com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:109)
at
com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18)
at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:648)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:605)
... 23 more
@davies, do you have any insight as to the cause?
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