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From "Kostas Kloudas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6321) RocksDB state backend Checkpointing is not working with KeydCEP.
Date Thu, 27 Apr 2017 16:48:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15986999#comment-15986999
] 

Kostas Kloudas commented on FLINK-6321:
---------------------------------------

Hi [[~shashank734] !  Thanks a lot for reporting the issue. 

I have a potential solution to this issue in branch https://github.com/kl0u/flink/tree/cep-serialization.

In order to test it, it would be really helpful if you could either 
provide the program (or a minimal example) that reproduces the issue, or, 
take this brach and re-run your program, take a savepoint, try to restore from that, and tell
us if it runs.

This would be really helpful, especially now that we are close to the 1.3 feature freeze.

> RocksDB state backend Checkpointing is not working with KeydCEP.
> ----------------------------------------------------------------
>
>                 Key: FLINK-6321
>                 URL: https://issues.apache.org/jira/browse/FLINK-6321
>             Project: Flink
>          Issue Type: Bug
>          Components: CEP, State Backends, Checkpointing
>    Affects Versions: 1.2.0
>         Environment: yarn-cluster, RocksDB State backend, Checkpointing every 1000 ms
>            Reporter: Shashank Agarwal
>            Assignee: Kostas Kloudas
>
> Checkpointing is not working with RocksDBStateBackend when using CEP. It's working fine
with FsStateBackend and MemoryStateBackend. Application failing every-time.
> {code}
> 04/18/2017 21:53:20	Job execution switched to status FAILING.
> AsynchronousException{java.lang.Exception: Could not materialize checkpoint 46 for operator
KeyedCEPPatternOperator -> Map (1/4).}
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.run(StreamTask.java:980)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.Exception: Could not materialize checkpoint 46 for operator KeyedCEPPatternOperator
-> Map (1/4).
> 	... 6 more
> Caused by: java.util.concurrent.CancellationException
> 	at java.util.concurrent.FutureTask.report(FutureTask.java:121)
> 	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
> 	at org.apache.flink.util.FutureUtil.runIfNotDoneAndGet(FutureUtil.java:40)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.run(StreamTask.java:915)
> 	... 5 more
> {code}



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