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Posted to dev@pig.apache.org by "Travis Crawford (Work started) (JIRA)" <ji...@apache.org> on 2012/02/15 02:39:59 UTC
[jira] [Work started] (PIG-2532) Registered classes fail
deserialization in frontend
[ https://issues.apache.org/jira/browse/PIG-2532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on PIG-2532 started by Travis Crawford.
> Registered classes fail deserialization in frontend
> ---------------------------------------------------
>
> Key: PIG-2532
> URL: https://issues.apache.org/jira/browse/PIG-2532
> Project: Pig
> Issue Type: Bug
> Reporter: Travis Crawford
> Assignee: Travis Crawford
> Attachments: PIG-2532.patch
>
>
> This issue came up while integrating HCatalog with our environment. HCatalog jars are added to the pig command-line with {{-Dpig.additional.jars}} but fails (exception below). When added to the pig classpath the error goes away.
> We identified the issue as deserialization using the root class loader, not the context class loader set when the thread is created. This causes HCatSchema which is serialized into the context to fail deserialization in the thread.
> {code}
> 2012-02-14 21:55:53,936 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 6017: java.io.IOException: Deserialization error: org.apache.hcatalog.data.schema.HCatSchema
> at org.apache.pig.impl.util.ObjectSerializer.deserialize(ObjectSerializer.java:55)
> at org.apache.pig.impl.util.UDFContext.deserialize(UDFContext.java:181)
> at org.apache.pig.backend.hadoop.executionengine.util.MapRedUtil.setupUDFContext(MapRedUtil.java:159)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat.setupUdfEnvAndStores(PigOutputFormat.java:229)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat.checkOutputSpecs(PigOutputFormat.java:186)
> at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:811)
> at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:771)
> at org.apache.hadoop.mapred.jobcontrol.Job.submit(Job.java:378)
> at org.apache.hadoop.mapred.jobcontrol.JobControl.startReadyJobs(JobControl.java:247)
> 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.pig.backend.hadoop.executionengine.mapReduceLayer.PigJobControl.mainLoopAction(PigJobControl.java:144)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigJobControl.run(PigJobControl.java:121)
> at java.lang.Thread.run(Thread.java:662)
> Caused by: java.lang.ClassNotFoundException: org.apache.hcatalog.data.schema.HCatSchema
> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:247)
> at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:603)
> at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1574)
> at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
> at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
> at java.util.Hashtable.readObject(Hashtable.java:859)
> 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.invokeReadObject(ObjectStreamClass.java:974)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
> at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
> at java.util.HashMap.readObject(HashMap.java:1030)
> 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.invokeReadObject(ObjectStreamClass.java:974)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
> at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
> at org.apache.pig.impl.util.ObjectSerializer.deserialize(ObjectSerializer.java:53)
> ... 15 more
> {code}
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