Hi,
I am trying to get the frequency of each Unicode char in a document
collection using Spark. Here is the code snippet that does the job:
JavaPairRDD<LongWritable, Text> rows = sc.sequenceFile(args[0],
LongWritable.class, Text.class);
rows = rows.coalesce(10000);
JavaPairRDD<Character,Long> pairs = rows.flatMapToPair(t -> {
String content=t._2.toString();
Multiset<Character> chars= HashMultiset.create();
for(int i=0;i<content.length();i++)
chars.add(content.charAt(i));
List<Tuple2<Character,Long>> list=new
ArrayList<Tuple2<Character, Long>>();
for(Character ch:chars.elementSet()){
list.add(new
Tuple2<Character,Long>(ch,(long)chars.count(ch)));
}
return list;
});
JavaPairRDD<Character, Long> counts = pairs.reduceByKey((a, b) -> a
+ b);
System.out.printf("MapCount %,d\n",counts.count());
But, I get the following exception:
15/01/03 21:51:34 ERROR MapOutputTrackerMasterActor: Map output statuses
were 11141547 bytes which exceeds spark.akka.frameSize (10485760 bytes).
org.apache.spark.SparkException: Map output statuses were 11141547 bytes
which exceeds spark.akka.frameSize (10485760 bytes).
at
org.apache.spark.MapOutputTrackerMasterActor$$anonfun$receiveWithLogging$1.applyOrElse(MapOutputTracker.scala:59)
at
scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33)
at
scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33)
at
scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25)
at
org.apache.spark.util.ActorLogReceive$$anon$1.apply(ActorLogReceive.scala:53)
at
org.apache.spark.util.ActorLogReceive$$anon$1.apply(ActorLogReceive.scala:42)
at
scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118)
at
org.apache.spark.util.ActorLogReceive$$anon$1.applyOrElse(ActorLogReceive.scala:42)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at
org.apache.spark.MapOutputTrackerMasterActor.aroundReceive(MapOutputTracker.scala:42)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
at akka.dispatch.Mailbox.run(Mailbox.scala:220)
at
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
at
scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Would you please tell me where is the fault?
If I process fewer rows, there is no problem. However, when the number of
rows is large I always get this exception.
Thanks beforehand.
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