Can you illustrate how sampleMap is populated ?
Thanks
On Thu, Jun 23, 2016 at 12:34 PM, SRK <swethakasire...@gmail.com> wrote:
> Hi,
>
> I keep getting the following error in my Spark Streaming every now and then
> after the job runs for say around 10 hours. I have those 2 classes
> registered in kryo as shown below. sampleMap is a field in SampleSession
> as shown below. Any suggestion as to how to avoid this would be of great
> help!!
>
> public class SampleSession implements Serializable, Cloneable{
> private Map<String, Sample> sampleMap;
> }
>
> sparkConf.registerKryoClasses(Array( classOf[SampleSession],
> classOf[Sample]))
>
>
>
> com.esotericsoftware.kryo.KryoException: java.lang.ClassCastException:
> com.test.Sample cannot be cast to java.lang.String
> Serialization trace:
> sampleMap (com.test.SampleSession)
> at
>
> com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585)
> at
>
> com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
> at
> com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568)
> at
> com.twitter.chill.Tuple6Serializer.write(TupleSerializers.scala:96)
> at
> com.twitter.chill.Tuple6Serializer.write(TupleSerializers.scala:93)
> at
> com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568)
> at
> com.twitter.chill.Tuple2Serializer.write(TupleSerializers.scala:37)
> at
> com.twitter.chill.Tuple2Serializer.write(TupleSerializers.scala:33)
> at
> com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568)
> at
>
> org.apache.spark.serializer.KryoSerializationStream.writeObject(KryoSerializer.scala:158)
> at
>
> org.apache.spark.serializer.SerializationStream.writeAll(Serializer.scala:153)
> at
>
> org.apache.spark.storage.BlockManager.dataSerializeStream(BlockManager.scala:1190)
> at
>
> org.apache.spark.storage.BlockManager.dataSerialize(BlockManager.scala:1199)
> at
> org.apache.spark.storage.MemoryStore.putArray(MemoryStore.scala:132)
> at
> org.apache.spark.storage.BlockManager.doPut(BlockManager.scala:793)
> at
> org.apache.spark.storage.BlockManager.putArray(BlockManager.scala:669)
> at
> org.apache.spark.CacheManager.putInBlockManager(CacheManager.scala:175)
> at
> org.apache.spark.CacheManager.getOrCompute(CacheManager.scala:78)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:262)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:300)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:264)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:300)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:264)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:300)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:264)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:300)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:264)
> at
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:73)
> at
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
> at org.apache.spark.scheduler.Task.run(Task.scala:88)
> at
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
> at
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
>
> Caused by: java.lang.ClassCastException: com.test.Sample cannot be cast to
> java.lang.String
> at
>
> com.esotericsoftware.kryo.serializers.DefaultSerializers$StringSerializer.write(DefaultSerializers.java:146)
> at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549)
> at
>
> com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:82)
> at
>
> com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:17)
> at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
> at
>
> com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
> ... 37 more
>
>
>
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