[CRUNCH-339] java.io.NotSerializableException when calling PCollection.cache()

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.8.2
• Component/s: IO
• Environment: CDH4.4.0
• Assignee: Unassigned
• Reporter: Sungwoo Park
• Created: 05/Feb/14 02:23
• Updated: 05/Feb/14 03:09

Description

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