Re: Restore state class not found exception in 1.8

Posted by Lasse Nedergaard on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Restore-state-class-not-found-exception-in-1-8-tp28027p28045.html

Hi Gordon

Thanks for the reply. No we haven’t moved it around namespaces. The only thing we have done is to add a new attribute to the object in another branch of our code and it could be we by mistake has used it but it should still not give a class not found exception. 

We have the save point data in S3 so is there a way to use this save point together with test case so we can debug it locally? Or start Flink mini cluster with this save point?

Med venlig hilsen / Best regards

Lasse Nedergaard

Den 28. maj 2019 kl. 10.06 skrev Tzu-Li (Gordon) Tai <[hidden email]>:

Hi Lasse,

Did you move the class to a different namespace / package or changed to be a nested class, across the Flink versions?
That would be the only cause I could reason about at the moment.

If possible, could you also have a very minimal snippet / instructions on how I can maybe reproduce this?
That might give me more insight.

Cheers,
Gordon

On Mon, May 27, 2019 at 7:52 PM Lasse Nedergaard <[hidden email]> wrote:

Hi.

When we restart some of our jobs from a savepoint we see the the exception below. It only happens for some of our jobs and we didn't see it in 1.7.2. The class Flink can't find differ from job to job and we are sure it's included in our Fat jar.

As a side note we are on our way to use Avro instead of POJO, but are not there yet.

If anyone have a clue what the root cause could be, and how to resolve it would be appreciated.

Thanks in advance

Lasse Nedergaard

java.lang.Exception: Exception while creating StreamOperatorStateContext.
	at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:195)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:250)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flink.util.FlinkException: Could not restore operator state backend for StreamSink_609b5f7fc746f29234b038c121356a9b_(2/2) from any of the 1 provided restore options.
	at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
	at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.operatorStateBackend(StreamTaskStateInitializerImpl.java:255)
	at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:143)
	... 5 more
Caused by: org.apache.flink.runtime.state.BackendBuildingException: Failed when trying to restore operator state backend
	at org.apache.flink.runtime.state.DefaultOperatorStateBackendBuilder.build(DefaultOperatorStateBackendBuilder.java:86)
	at org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createOperatorStateBackend(RocksDBStateBackend.java:537)
	at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$operatorStateBackend$0(StreamTaskStateInitializerImpl.java:246)
	at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:142)
	at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:121)
	... 7 more
Caused by: java.lang.RuntimeException: Cannot instantiate class.
	at org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(PojoSerializer.java:384)
	at org.apache.flink.runtime.state.OperatorStateRestoreOperation.deserializeOperatorStateValues(OperatorStateRestoreOperation.java:191)
	at org.apache.flink.runtime.state.OperatorStateRestoreOperation.restore(OperatorStateRestoreOperation.java:165)
	at org.apache.flink.runtime.state.DefaultOperatorStateBackendBuilder.build(DefaultOperatorStateBackendBuilder.java:83)
	... 11 more
Caused by: java.lang.ClassNotFoundException: org/trackunit/tm2/formats/ReportMessage
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(PojoSerializer.java:382)
	... 14 more