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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