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From "Sungwoo Park (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-339) java.io.NotSerializableException when calling PCollection.cache()
Date Wed, 05 Feb 2014 02:24:18 GMT
Sungwoo Park created CRUNCH-339:
-----------------------------------

             Summary: java.io.NotSerializableException when calling PCollection.cache()
                 Key: CRUNCH-339
                 URL: https://issues.apache.org/jira/browse/CRUNCH-339
             Project: Crunch
          Issue Type: Bug
          Components: IO
    Affects Versions: 0.8.2
         Environment: CDH4.4.0
            Reporter: Sungwoo Park


When I was debugging a MRPipeline, I found that calling cache() function causes java.io.NotSerializableException

Code:
(...)
PCollection<Long> candidates = loadCandidate(pipeline, candidatesPath);
candidates.cache();
(...)

public PCollection<Long> loadCandidate(Pipeline p, Path candidatesPath) {
		if(candidatesPath == null)
			return null;
		
		return p.read(From.textFile(candidatesPath)).parallelDo(new DoFn<String, Long>(){

			@Override
			public void process(String stringId, Emitter<Long> emitter) {
				emitter.emit(Long.parseLong(stringId));
			}
			
		}, Writables.longs());
	}


Stack trace:
Exception in thread "main" org.apache.crunch.CrunchRuntimeException: java.io.NotSerializableException:
com.coupang.recommender.ever.utils.recommender.OryxRecommender
	at org.apache.crunch.impl.mr.MRPipeline.plan(MRPipeline.java:104)
	at org.apache.crunch.impl.mr.MRPipeline.runAsync(MRPipeline.java:123)
	at org.apache.crunch.impl.mr.MRPipeline.run(MRPipeline.java:111)
	at org.apache.crunch.impl.dist.DistributedPipeline.done(DistributedPipeline.java:109)
	at com.coupang.recommender.ever.utils.recommender.OryxRecommender.run(OryxRecommender.java:108)
	at com.coupang.recommender.ever.utils.EverUtil.run(EverUtil.java:30)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
	at com.coupang.recommender.ever.utils.Driver.main(Driver.java:34)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:208)
Caused by: java.io.NotSerializableException: com.coupang.recommender.ever.utils.recommender.OryxRecommender
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
	at java.util.ArrayList.writeObject(ArrayList.java:570)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:940)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
	at java.util.ArrayList.writeObject(ArrayList.java:570)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:940)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
	at org.apache.crunch.util.DistCache.write(DistCache.java:55)
	at org.apache.crunch.impl.mr.plan.JobPrototype.serialize(JobPrototype.java:242)
	at org.apache.crunch.impl.mr.plan.JobPrototype.build(JobPrototype.java:215)
	at org.apache.crunch.impl.mr.plan.JobPrototype.getCrunchJob(JobPrototype.java:134)
	at org.apache.crunch.impl.mr.plan.MSCRPlanner.plan(MSCRPlanner.java:165)
	at org.apache.crunch.impl.mr.MRPipeline.plan(MRPipeline.java:102)
	... 12 more




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