Hey Cliff, can you provide the stack trace of the issue you were seeing? We recently ran into a similar issue that we're still debugging. Did it look like this:
java.lang.IllegalStateException: Could not initialize operator state > backend. > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.initOperatorState(AbstractStreamOperator.java:301) > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:248) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.initializeOperators(StreamTask.java:692) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:679) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:253) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718) > at java.lang.Thread.run(Thread.java:748) > Caused by: java.lang.UnsupportedOperationException: Could not find > required Avro dependency. > at > org.apache.flink.api.java.typeutils.runtime.kryo.Serializers$DummyAvroKryoSerializerClass.read(Serializers.java:170) > at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761) > at > org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize(KryoSerializer.java:249) > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:136) > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:30) > at > org.apache.flink.runtime.state.DefaultOperatorStateBackend.deserializeStateValues(DefaultOperatorStateBackend.java:584) > at > org.apache.flink.runtime.state.DefaultOperatorStateBackend.restore(DefaultOperatorStateBackend.java:399) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.createOperatorStateBackend(StreamTask.java:733) > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.initOperatorState(AbstractStreamOperator.java:299) > ... 6 common frames omitted > 00:17:19.626 INFO o.a.f.r.e.ExecutionGraph - Job > ClientEventToElasticsearchJob (5cec438674e9a111703c83897f7c8138) switched > from state RUNNING to FAILING. > java.lang.IllegalStateException: Could not initialize operator state > backend. > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.initOperatorState(AbstractStreamOperator.java:301) > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:248) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.initializeOperators(StreamTask.java:692) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:679) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:253) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718) > at java.lang.Thread.run(Thread.java:748) > Caused by: java.lang.UnsupportedOperationException: Could not find > required Avro dependency. > at > org.apache.flink.api.java.typeutils.runtime.kryo.Serializers$DummyAvroKryoSerializerClass.read(Serializers.java:170) > at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761) > at > org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize(KryoSerializer.java:249) > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:136) > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:30) > at > org.apache.flink.runtime.state.DefaultOperatorStateBackend.deserializeStateValues(DefaultOperatorStateBackend.java:584) > at > org.apache.flink.runtime.state.DefaultOperatorStateBackend.restore(DefaultOperatorStateBackend.java:399) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.createOperatorStateBackend(StreamTask.java:733) > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.initOperatorState(AbstractStreamOperator.java:299) > ... 6 common frames omitted -Jamie On Mon, Aug 20, 2018 at 10:42 AM, Cliff Resnick <cre...@gmail.com> wrote: > Hi Vino, > > You were right in your assumption -- unshaded avro was being added to our > application jar via third-party dependency. Excluding it in packaging fixed > the issue. For the record, it looks flink-avro must be loaded from the lib > or there will be errors in checkpoint restores. > > On Mon, Aug 20, 2018 at 8:43 AM Cliff Resnick <cre...@gmail.com> wrote: > >> Hi Vino, >> >> Thanks for the explanation, but the job only ever uses the Avro (1.8.2) >> pulled in by flink-formats/avro, so it's not a class version conflict >> there. >> >> I'm using default child-first loading. It might be a further transitive >> dependency, though it's not clear by stack trace or stepping through the >> process. When I get a chance I'll look further into it but in case anyone >> is experiencing similar problems, what is clear is that classloader order >> does matter with Avro. >> >> On Sun, Aug 19, 2018, 11:36 PM vino yang <yanghua1...@gmail.com> wrote: >> >>> Hi Cliff, >>> >>> My personal guess is that this may be caused by Job's Avro conflict with >>> the Avro that the Flink framework itself relies on. >>> Flink has provided some configuration parameters which allows you to >>> determine the order of the classloaders yourself. [1] >>> Alternatively, you can debug classloading and participate in the >>> documentation.[2] >>> >>> [1]: https://ci.apache.org/projects/flink/flink-docs- >>> release-1.6/ops/config.html >>> [2]: https://ci.apache.org/projects/flink/flink-docs- >>> stable/monitoring/debugging_classloading.html >>> >>> Thanks, vino. >>> >>> Cliff Resnick <cre...@gmail.com> 于2018年8月20日周一 上午10:40写道： >>> >>>> Our Flink/YARN pipeline has been reading Avro from Kafka for a while >>>> now. We just introduced a source of Avro OCF (Object Container Files) read >>>> from S3. The Kafka Avro continued to decode without incident, but the OCF >>>> files failed 100% with anomalous parse errors in the decoding phase after >>>> the schema and codec were successfully read from them. The pipeline would >>>> work on my laptop, and when I submitted a test Main program to the Flink >>>> Session in YARN, that would also successfully decode. Only the actual >>>> pipeline run from the TaskManager failed. At one point I even remote >>>> debugged the TaskManager process and stepped through what looked like a >>>> normal Avro decode (if you can describe Avro code as normal!) -- until it >>>> abruptly failed with an int decode or what-have-you. >>>> >>>> This stumped me for a while, but I finally tried moving flink-avro.jar >>>> from the lib to the application jar, and that fixed it. I'm not sure why >>>> this is, especially since there were no typical classloader-type errors. >>>> This issue was observed both on Flink 1.5 and 1.6 in Flip-6 mode. >>>> >>>> -Cliff >>>> >>>> >>>> >>>> >>>> >>>>
