Re: broadcast variable of Kafka producer throws ConcurrentModificationException
I'm glad that I could help :) 19 sie 2015 8:52 AM Shenghua(Daniel) Wan wansheng...@gmail.com napisał(a): +1 I wish I have read this blog earlier. I am using Java and have just implemented a singleton producer per executor/JVM during the day. Yes, I did see that NonSerializableException when I was debugging the code ... Thanks for sharing. On Tue, Aug 18, 2015 at 10:59 PM, Tathagata Das t...@databricks.com wrote: Its a cool blog post! Tweeted it! Broadcasting the configuration necessary for lazily instantiating the producer is a good idea. Nitpick: The first code example has an extra `}` ;) On Tue, Aug 18, 2015 at 10:49 PM, Marcin Kuthan marcin.kut...@gmail.com wrote: As long as Kafka producent is thread-safe you don't need any pool at all. Just share single producer on every executor. Please look at my blog post for more details. http://allegro.tech/spark-kafka-integration.html 19 sie 2015 2:00 AM Shenghua(Daniel) Wan wansheng...@gmail.com napisał(a): All of you are right. I was trying to create too many producers. My idea was to create a pool(for now the pool contains only one producer) shared by all the executors. After I realized it was related to the serializable issues (though I did not find clear clues in the source code to indicate the broacast template type parameter must be implement serializable), I followed spark cassandra connector design and created a singleton of Kafka producer pools. There is not exception noticed. Thanks for all your comments. On Tue, Aug 18, 2015 at 4:28 PM, Tathagata Das t...@databricks.com wrote: Why are you even trying to broadcast a producer? A broadcast variable is some immutable piece of serializable DATA that can be used for processing on the executors. A Kafka producer is neither DATA nor immutable, and definitely not serializable. The right way to do this is to create the producer in the executors. Please see the discussion in the programming guide http://spark.apache.org/docs/latest/streaming-programming-guide.html#output-operations-on-dstreams On Tue, Aug 18, 2015 at 3:08 PM, Cody Koeninger c...@koeninger.org wrote: I wouldn't expect a kafka producer to be serializable at all... among other things, it has a background thread On Tue, Aug 18, 2015 at 4:55 PM, Shenghua(Daniel) Wan wansheng...@gmail.com wrote: Hi, Did anyone see java.util.ConcurrentModificationException when using broadcast variables? I encountered this exception when wrapping a Kafka producer like this in the spark streaming driver. Here is what I did. KafkaProducerString, String producer = new KafkaProducerString, String(properties); final BroadcastKafkaDataProducer bCastProducer = streamingContext.sparkContext().broadcast(producer); Then within an closure called by a foreachRDD, I was trying to get the wrapped producer, i.e. KafkaProducerString, String p = bCastProducer.value(); after rebuilding and rerunning, I got the stack trace like this Exception in thread main com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.spark.util.MutableURLClassLoader) contextClassLoader (org.apache.kafka.common.utils.KafkaThread) ioThread (org.apache.kafka.clients.producer.KafkaProducer) producer (my driver) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:318) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:570) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at
Re: broadcast variable of Kafka producer throws ConcurrentModificationException
+1 I wish I have read this blog earlier. I am using Java and have just implemented a singleton producer per executor/JVM during the day. Yes, I did see that NonSerializableException when I was debugging the code ... Thanks for sharing. On Tue, Aug 18, 2015 at 10:59 PM, Tathagata Das t...@databricks.com wrote: Its a cool blog post! Tweeted it! Broadcasting the configuration necessary for lazily instantiating the producer is a good idea. Nitpick: The first code example has an extra `}` ;) On Tue, Aug 18, 2015 at 10:49 PM, Marcin Kuthan marcin.kut...@gmail.com wrote: As long as Kafka producent is thread-safe you don't need any pool at all. Just share single producer on every executor. Please look at my blog post for more details. http://allegro.tech/spark-kafka-integration.html 19 sie 2015 2:00 AM Shenghua(Daniel) Wan wansheng...@gmail.com napisał(a): All of you are right. I was trying to create too many producers. My idea was to create a pool(for now the pool contains only one producer) shared by all the executors. After I realized it was related to the serializable issues (though I did not find clear clues in the source code to indicate the broacast template type parameter must be implement serializable), I followed spark cassandra connector design and created a singleton of Kafka producer pools. There is not exception noticed. Thanks for all your comments. On Tue, Aug 18, 2015 at 4:28 PM, Tathagata Das t...@databricks.com wrote: Why are you even trying to broadcast a producer? A broadcast variable is some immutable piece of serializable DATA that can be used for processing on the executors. A Kafka producer is neither DATA nor immutable, and definitely not serializable. The right way to do this is to create the producer in the executors. Please see the discussion in the programming guide http://spark.apache.org/docs/latest/streaming-programming-guide.html#output-operations-on-dstreams On Tue, Aug 18, 2015 at 3:08 PM, Cody Koeninger c...@koeninger.org wrote: I wouldn't expect a kafka producer to be serializable at all... among other things, it has a background thread On Tue, Aug 18, 2015 at 4:55 PM, Shenghua(Daniel) Wan wansheng...@gmail.com wrote: Hi, Did anyone see java.util.ConcurrentModificationException when using broadcast variables? I encountered this exception when wrapping a Kafka producer like this in the spark streaming driver. Here is what I did. KafkaProducerString, String producer = new KafkaProducerString, String(properties); final BroadcastKafkaDataProducer bCastProducer = streamingContext.sparkContext().broadcast(producer); Then within an closure called by a foreachRDD, I was trying to get the wrapped producer, i.e. KafkaProducerString, String p = bCastProducer.value(); after rebuilding and rerunning, I got the stack trace like this Exception in thread main com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.spark.util.MutableURLClassLoader) contextClassLoader (org.apache.kafka.common.utils.KafkaThread) ioThread (org.apache.kafka.clients.producer.KafkaProducer) producer (my driver) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:318) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:570) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at
Re: broadcast variable of Kafka producer throws ConcurrentModificationException
All of you are right. I was trying to create too many producers. My idea was to create a pool(for now the pool contains only one producer) shared by all the executors. After I realized it was related to the serializable issues (though I did not find clear clues in the source code to indicate the broacast template type parameter must be implement serializable), I followed spark cassandra connector design and created a singleton of Kafka producer pools. There is not exception noticed. Thanks for all your comments. On Tue, Aug 18, 2015 at 4:28 PM, Tathagata Das t...@databricks.com wrote: Why are you even trying to broadcast a producer? A broadcast variable is some immutable piece of serializable DATA that can be used for processing on the executors. A Kafka producer is neither DATA nor immutable, and definitely not serializable. The right way to do this is to create the producer in the executors. Please see the discussion in the programming guide http://spark.apache.org/docs/latest/streaming-programming-guide.html#output-operations-on-dstreams On Tue, Aug 18, 2015 at 3:08 PM, Cody Koeninger c...@koeninger.org wrote: I wouldn't expect a kafka producer to be serializable at all... among other things, it has a background thread On Tue, Aug 18, 2015 at 4:55 PM, Shenghua(Daniel) Wan wansheng...@gmail.com wrote: Hi, Did anyone see java.util.ConcurrentModificationException when using broadcast variables? I encountered this exception when wrapping a Kafka producer like this in the spark streaming driver. Here is what I did. KafkaProducerString, String producer = new KafkaProducerString, String(properties); final BroadcastKafkaDataProducer bCastProducer = streamingContext.sparkContext().broadcast(producer); Then within an closure called by a foreachRDD, I was trying to get the wrapped producer, i.e. KafkaProducerString, String p = bCastProducer.value(); after rebuilding and rerunning, I got the stack trace like this Exception in thread main com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.spark.util.MutableURLClassLoader) contextClassLoader (org.apache.kafka.common.utils.KafkaThread) ioThread (org.apache.kafka.clients.producer.KafkaProducer) producer (my driver) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:318) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:570) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at org.apache.spark.serializer.KryoSerializationStream.writeObject(KryoSerializer.scala:148) at org.apache.spark.broadcast.TorrentBroadcast$.blockifyObject(TorrentBroadcast.scala:203) at org.apache.spark.broadcast.TorrentBroadcast.writeBlocks(TorrentBroadcast.scala:102) at org.apache.spark.broadcast.TorrentBroadcast.init(TorrentBroadcast.scala:85) at
Re: broadcast variable of Kafka producer throws ConcurrentModificationException
Why are you even trying to broadcast a producer? A broadcast variable is some immutable piece of serializable DATA that can be used for processing on the executors. A Kafka producer is neither DATA nor immutable, and definitely not serializable. The right way to do this is to create the producer in the executors. Please see the discussion in the programming guide http://spark.apache.org/docs/latest/streaming-programming-guide.html#output-operations-on-dstreams On Tue, Aug 18, 2015 at 3:08 PM, Cody Koeninger c...@koeninger.org wrote: I wouldn't expect a kafka producer to be serializable at all... among other things, it has a background thread On Tue, Aug 18, 2015 at 4:55 PM, Shenghua(Daniel) Wan wansheng...@gmail.com wrote: Hi, Did anyone see java.util.ConcurrentModificationException when using broadcast variables? I encountered this exception when wrapping a Kafka producer like this in the spark streaming driver. Here is what I did. KafkaProducerString, String producer = new KafkaProducerString, String(properties); final BroadcastKafkaDataProducer bCastProducer = streamingContext.sparkContext().broadcast(producer); Then within an closure called by a foreachRDD, I was trying to get the wrapped producer, i.e. KafkaProducerString, String p = bCastProducer.value(); after rebuilding and rerunning, I got the stack trace like this Exception in thread main com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.spark.util.MutableURLClassLoader) contextClassLoader (org.apache.kafka.common.utils.KafkaThread) ioThread (org.apache.kafka.clients.producer.KafkaProducer) producer (my driver) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:318) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:570) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at org.apache.spark.serializer.KryoSerializationStream.writeObject(KryoSerializer.scala:148) at org.apache.spark.broadcast.TorrentBroadcast$.blockifyObject(TorrentBroadcast.scala:203) at org.apache.spark.broadcast.TorrentBroadcast.writeBlocks(TorrentBroadcast.scala:102) at org.apache.spark.broadcast.TorrentBroadcast.init(TorrentBroadcast.scala:85) at org.apache.spark.broadcast.TorrentBroadcastFactory.newBroadcast(TorrentBroadcastFactory.scala:34) at org.apache.spark.broadcast.BroadcastManager.newBroadcast(BroadcastManager.scala:62) at org.apache.spark.SparkContext.broadcast(SparkContext.scala:1289) at org.apache.spark.api.java.JavaSparkContext.broadcast(JavaSparkContext.scala:648) at my driver 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
Re: broadcast variable of Kafka producer throws ConcurrentModificationException
As long as Kafka producent is thread-safe you don't need any pool at all. Just share single producer on every executor. Please look at my blog post for more details. http://allegro.tech/spark-kafka-integration.html 19 sie 2015 2:00 AM Shenghua(Daniel) Wan wansheng...@gmail.com napisał(a): All of you are right. I was trying to create too many producers. My idea was to create a pool(for now the pool contains only one producer) shared by all the executors. After I realized it was related to the serializable issues (though I did not find clear clues in the source code to indicate the broacast template type parameter must be implement serializable), I followed spark cassandra connector design and created a singleton of Kafka producer pools. There is not exception noticed. Thanks for all your comments. On Tue, Aug 18, 2015 at 4:28 PM, Tathagata Das t...@databricks.com wrote: Why are you even trying to broadcast a producer? A broadcast variable is some immutable piece of serializable DATA that can be used for processing on the executors. A Kafka producer is neither DATA nor immutable, and definitely not serializable. The right way to do this is to create the producer in the executors. Please see the discussion in the programming guide http://spark.apache.org/docs/latest/streaming-programming-guide.html#output-operations-on-dstreams On Tue, Aug 18, 2015 at 3:08 PM, Cody Koeninger c...@koeninger.org wrote: I wouldn't expect a kafka producer to be serializable at all... among other things, it has a background thread On Tue, Aug 18, 2015 at 4:55 PM, Shenghua(Daniel) Wan wansheng...@gmail.com wrote: Hi, Did anyone see java.util.ConcurrentModificationException when using broadcast variables? I encountered this exception when wrapping a Kafka producer like this in the spark streaming driver. Here is what I did. KafkaProducerString, String producer = new KafkaProducerString, String(properties); final BroadcastKafkaDataProducer bCastProducer = streamingContext.sparkContext().broadcast(producer); Then within an closure called by a foreachRDD, I was trying to get the wrapped producer, i.e. KafkaProducerString, String p = bCastProducer.value(); after rebuilding and rerunning, I got the stack trace like this Exception in thread main com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.spark.util.MutableURLClassLoader) contextClassLoader (org.apache.kafka.common.utils.KafkaThread) ioThread (org.apache.kafka.clients.producer.KafkaProducer) producer (my driver) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:318) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:570) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at org.apache.spark.serializer.KryoSerializationStream.writeObject(KryoSerializer.scala:148) at
Re: broadcast variable of Kafka producer throws ConcurrentModificationException
Its a cool blog post! Tweeted it! Broadcasting the configuration necessary for lazily instantiating the producer is a good idea. Nitpick: The first code example has an extra `}` ;) On Tue, Aug 18, 2015 at 10:49 PM, Marcin Kuthan marcin.kut...@gmail.com wrote: As long as Kafka producent is thread-safe you don't need any pool at all. Just share single producer on every executor. Please look at my blog post for more details. http://allegro.tech/spark-kafka-integration.html 19 sie 2015 2:00 AM Shenghua(Daniel) Wan wansheng...@gmail.com napisał(a): All of you are right. I was trying to create too many producers. My idea was to create a pool(for now the pool contains only one producer) shared by all the executors. After I realized it was related to the serializable issues (though I did not find clear clues in the source code to indicate the broacast template type parameter must be implement serializable), I followed spark cassandra connector design and created a singleton of Kafka producer pools. There is not exception noticed. Thanks for all your comments. On Tue, Aug 18, 2015 at 4:28 PM, Tathagata Das t...@databricks.com wrote: Why are you even trying to broadcast a producer? A broadcast variable is some immutable piece of serializable DATA that can be used for processing on the executors. A Kafka producer is neither DATA nor immutable, and definitely not serializable. The right way to do this is to create the producer in the executors. Please see the discussion in the programming guide http://spark.apache.org/docs/latest/streaming-programming-guide.html#output-operations-on-dstreams On Tue, Aug 18, 2015 at 3:08 PM, Cody Koeninger c...@koeninger.org wrote: I wouldn't expect a kafka producer to be serializable at all... among other things, it has a background thread On Tue, Aug 18, 2015 at 4:55 PM, Shenghua(Daniel) Wan wansheng...@gmail.com wrote: Hi, Did anyone see java.util.ConcurrentModificationException when using broadcast variables? I encountered this exception when wrapping a Kafka producer like this in the spark streaming driver. Here is what I did. KafkaProducerString, String producer = new KafkaProducerString, String(properties); final BroadcastKafkaDataProducer bCastProducer = streamingContext.sparkContext().broadcast(producer); Then within an closure called by a foreachRDD, I was trying to get the wrapped producer, i.e. KafkaProducerString, String p = bCastProducer.value(); after rebuilding and rerunning, I got the stack trace like this Exception in thread main com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.spark.util.MutableURLClassLoader) contextClassLoader (org.apache.kafka.common.utils.KafkaThread) ioThread (org.apache.kafka.clients.producer.KafkaProducer) producer (my driver) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:318) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:570) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at
broadcast variable of Kafka producer throws ConcurrentModificationException
Hi, Did anyone see java.util.ConcurrentModificationException when using broadcast variables? I encountered this exception when wrapping a Kafka producer like this in the spark streaming driver. Here is what I did. KafkaProducerString, String producer = new KafkaProducerString, String(properties); final BroadcastKafkaDataProducer bCastProducer = streamingContext.sparkContext().broadcast(producer); Then within an closure called by a foreachRDD, I was trying to get the wrapped producer, i.e. KafkaProducerString, String p = bCastProducer.value(); after rebuilding and rerunning, I got the stack trace like this Exception in thread main com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.spark.util.MutableURLClassLoader) contextClassLoader (org.apache.kafka.common.utils.KafkaThread) ioThread (org.apache.kafka.clients.producer.KafkaProducer) producer (my driver) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:318) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:570) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at org.apache.spark.serializer.KryoSerializationStream.writeObject(KryoSerializer.scala:148) at org.apache.spark.broadcast.TorrentBroadcast$.blockifyObject(TorrentBroadcast.scala:203) at org.apache.spark.broadcast.TorrentBroadcast.writeBlocks(TorrentBroadcast.scala:102) at org.apache.spark.broadcast.TorrentBroadcast.init(TorrentBroadcast.scala:85) at org.apache.spark.broadcast.TorrentBroadcastFactory.newBroadcast(TorrentBroadcastFactory.scala:34) at org.apache.spark.broadcast.BroadcastManager.newBroadcast(BroadcastManager.scala:62) at org.apache.spark.SparkContext.broadcast(SparkContext.scala:1289) at org.apache.spark.api.java.JavaSparkContext.broadcast(JavaSparkContext.scala:648) at my driver at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:664) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:169) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:192) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:111) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) Caused by: java.util.ConcurrentModificationException at java.util.Vector$Itr.checkForComodification(Vector.java:1156) at java.util.Vector$Itr.next(Vector.java:1133) at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:67) at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:18) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at
Re: broadcast variable of Kafka producer throws ConcurrentModificationException
I wouldn't expect a kafka producer to be serializable at all... among other things, it has a background thread On Tue, Aug 18, 2015 at 4:55 PM, Shenghua(Daniel) Wan wansheng...@gmail.com wrote: Hi, Did anyone see java.util.ConcurrentModificationException when using broadcast variables? I encountered this exception when wrapping a Kafka producer like this in the spark streaming driver. Here is what I did. KafkaProducerString, String producer = new KafkaProducerString, String(properties); final BroadcastKafkaDataProducer bCastProducer = streamingContext.sparkContext().broadcast(producer); Then within an closure called by a foreachRDD, I was trying to get the wrapped producer, i.e. KafkaProducerString, String p = bCastProducer.value(); after rebuilding and rerunning, I got the stack trace like this Exception in thread main com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.spark.util.MutableURLClassLoader) contextClassLoader (org.apache.kafka.common.utils.KafkaThread) ioThread (org.apache.kafka.clients.producer.KafkaProducer) producer (my driver) 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.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:318) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:570) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at org.apache.spark.serializer.KryoSerializationStream.writeObject(KryoSerializer.scala:148) at org.apache.spark.broadcast.TorrentBroadcast$.blockifyObject(TorrentBroadcast.scala:203) at org.apache.spark.broadcast.TorrentBroadcast.writeBlocks(TorrentBroadcast.scala:102) at org.apache.spark.broadcast.TorrentBroadcast.init(TorrentBroadcast.scala:85) at org.apache.spark.broadcast.TorrentBroadcastFactory.newBroadcast(TorrentBroadcastFactory.scala:34) at org.apache.spark.broadcast.BroadcastManager.newBroadcast(BroadcastManager.scala:62) at org.apache.spark.SparkContext.broadcast(SparkContext.scala:1289) at org.apache.spark.api.java.JavaSparkContext.broadcast(JavaSparkContext.scala:648) at my driver 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 org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:664) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:169) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:192) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:111) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) Caused by: java.util.ConcurrentModificationException at java.util.Vector$Itr.checkForComodification(Vector.java:1156) at
