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Posted to issues@flink.apache.org by "Tzu-Li (Gordon) Tai (Jira)" <ji...@apache.org> on 2020/10/19 07:55:00 UTC
[jira] [Updated] (FLINK-19692) Can't restore feedback channel from
savepoint
[ https://issues.apache.org/jira/browse/FLINK-19692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tzu-Li (Gordon) Tai updated FLINK-19692:
----------------------------------------
Affects Version/s: (was: 1.11.2)
statefun-2.2.0
> Can't restore feedback channel from savepoint
> ---------------------------------------------
>
> Key: FLINK-19692
> URL: https://issues.apache.org/jira/browse/FLINK-19692
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream, API / State Processor, Stateful Functions
> Affects Versions: statefun-2.2.0
> Reporter: Antti Kaikkonen
> Priority: Blocker
>
> When using the new statefun-flink-datastream integration the following error is thrown by the *feedback -> union* task when trying to restore from a savepoint:
> {code:java}
> java.lang.Exception: Exception while creating StreamOperatorStateContext.
> at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:204)
> at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:247)
> at org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:290)
> at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$beforeInvoke$0(StreamTask.java:479)
> at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:47)
> at org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:475)
> at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:528)
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.io.IOException: java.io.IOException: position out of bounds
> at org.apache.flink.runtime.state.StatePartitionStreamProvider.getStream(StatePartitionStreamProvider.java:58)
> at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.internalTimeServiceManager(StreamTaskStateInitializerImpl.java:235)
> at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:167)
> ... 9 more
> Caused by: java.io.IOException: position out of bounds
> at org.apache.flink.runtime.state.memory.ByteStreamStateHandle$ByteStateHandleInputStream.seek(ByteStreamStateHandle.java:124)
> at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl$KeyGroupStreamIterator.next(StreamTaskStateInitializerImpl.java:442)
> at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl$KeyGroupStreamIterator.next(StreamTaskStateInitializerImpl.java:395)
> at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.internalTimeServiceManager(StreamTaskStateInitializerImpl.java:228)
> ... 10 more
> {code}
> The error is only thrown when the feedback channel has been used.
> I have tested with the [example application|https://github.com/apache/flink-statefun/blob/master/statefun-examples/statefun-flink-datastream-example/src/main/java/org/apache/flink/statefun/examples/datastream/Example.java] and the error is thrown only if it is modified to actually use the feedback channel. I simply modified the invoke method to sometimes forward the greeting to a random name:
> {code:java}
> @Override
> public void invoke(Context context, Object input) {
> int seen = seenCount.updateAndGet(MyFunction::increment);
> context.send(GREETINGS, String.format("Hello %s at the %d-th time", input, seen));
> String[] names = {"Stephan", "Igal", "Gordon", "Seth", "Marta"};
> ThreadLocalRandom random = ThreadLocalRandom.current();
> int index = random.nextInt(names.length);
> final String name2 = names[index];
> if (random.nextDouble() < 0.5) context.send(new Address(GREET, name2), input);
> }
> {code}
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