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From shkob1 <shahar.kobrin...@gmail.com>
Subject Dynamically Generated Classes - Cannot load user class
Date Mon, 22 Oct 2018 21:47:25 GMT
Hey,

I'm trying to run a job which uses a dynamically generated class (through
Byte Buddy).
think of me having a complex schema as yaml text and generating a class from
it. Throughout the job i am using an artificial super class (MySuperClass)
of the generated class (as for example i need to specify the generic class
to extend RichMapFunction).



MyRichMapFunction<Y extends MySuperClass> extends RichMapFunction<Row, Y> is
introducing the dynamic class. It will take the yaml in the CTOR and:
1. open - takes the schema and converts it into a Pojo class which extends
MySuperClass
2. getProducedType - does the same thing in order to correctly send the Pojo
with all the right fields

So basically my job is something like

env.addSource([stream of pojos])
.filter(...)
... (register table, running a query which generates Rows)
.map(myRichMapFunction)
.returns(myRichMapFunction.getProducedType)
.addSink(...)

My trouble now is that, when running on a cluster the classloader fails to
load my generated class.
i tried to use getRuntimeContext().getUserCodeClassLoader() as the loader to
use for Byte Buddy - but doesnt seem to be enough.

Was reading about it here:
https://ci.apache.org/projects/flink/flink-docs-stable/monitoring/debugging_classloading.html

Is there a hook maybe to get called when a job is loaded so i can load the
class?


Stacktrace:

org.apache.flink.client.program.ProgramInvocationException:
org.apache.flink.streaming.runtime.tasks.StreamTaskException: Cannot load
user class: com....model.MyGeneratedClass
ClassLoader info: URL ClassLoader:
    file:
'/var/folders/f7/c4pvjrf902b6c73_tbzkxnjw0000gn/T/blobStore-4b685b0a-b8c1-43a1-a75d-f0b9c0156f4c/job_d1187ea7e783007b92ef6c0597d72fcb/blob_p-38b9e6dce2423b0374f82842a35dcaa92e10dedd-6f1056ab61afcccb3c1fca895ccb3eb0'
(valid JAR)
Class not resolvable through given classloader.
	at
org.apache.flink.client.program.rest.RestClusterClient.submitJob(RestClusterClient.java:264)
	at
org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:464)
	at
org.apache.flink.streaming.api.environment.StreamContextEnvironment.execute(StreamContextEnvironment.java:66)
	at com.....MainClass.main(MainClass.java:46)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at
org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:528)
	at
org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:420)
	at
org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:404)
	at
org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:785)
	at org.apache.flink.client.cli.CliFrontend.runProgram(CliFrontend.java:279)
	at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:214)
	at
org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1025)
	at
org.apache.flink.client.cli.CliFrontend.lambda$main$9(CliFrontend.java:1101)
	at
org.apache.flink.runtime.security.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30)
	at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1101)
Caused by: org.apache.flink.streaming.runtime.tasks.StreamTaskException:
Cannot load user class: com.....model.DynamicSchema
ClassLoader info: URL ClassLoader:
    file:
'/var/folders/f7/c4pvjrf902b6c73_tbzkxnjw0000gn/T/blobStore-4b685b0a-b8c1-43a1-a75d-f0b9c0156f4c/job_d1187ea7e783007b92ef6c0597d72fcb/blob_p-38b9e6dce2423b0374f82842a35dcaa92e10dedd-6f1056ab61afcccb3c1fca895ccb3eb0'
(valid JAR)
Class not resolvable through given classloader.
	at
org.apache.flink.streaming.api.graph.StreamConfig.getStreamOperator(StreamConfig.java:236)
	at
org.apache.flink.streaming.runtime.tasks.OperatorChain.<init>(OperatorChain.java:99)
	at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:273)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:703)
	at java.lang.Thread.run(Thread.java:748)





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