[jira] [Issue Comment Deleted] (FLINK-17559) Backpressure seems to be broken when not going through network

["Austin Cawley-Edwards (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-17559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Austin Cawley-Edwards updated FLINK-17559:
------------------------------------------
    Comment: was deleted

(was: I think we can close this as well [~dwysakowicz], if you don't mind.)

> Backpressure seems to be broken when not going through network
> --------------------------------------------------------------
>
>                 Key: FLINK-17559
>                 URL: https://issues.apache.org/jira/browse/FLINK-17559
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors/ RabbitMQ
>    Affects Versions: 1.8.2
>            Reporter: Luis
>            Priority: Major
>         Attachments: Screenshot from 2020-05-07 13-31-23.png
>
>
> Back pressure for Flink seems broken. Someone please correct me, from what I understand it only works between network transfers.  If I have a source with no thread sleep then there is no back pressure some operation will accumulate data and crash.  I even tried removing chaining with
> env.disableOperatorChaining()
>  and it works with parallelism set to 1, but with 3 or 4 crashes. See below. 
>  
> From this I can conclude if I have any map function that produces more output that is coming in it will eventually crash if there is no network dividing them to allow for backpressure. Is this correct?
>  
>  
> {code:java}
> java.lang.OutOfMemoryError: Java heap space
> 2020-05-07 18:27:37,942 ERROR org.apache.flink.runtime.util.FatalExitExceptionHandler       - FATAL: Thread 'flink-scheduler-1' produced an uncaught exception. Stopping the process...
> java.lang.OutOfMemoryError: Java heap space
>         at akka.dispatch.AbstractNodeQueue.<init>(AbstractNodeQueue.java:32)
>         at akka.actor.LightArrayRevolverScheduler$TaskQueue.<init>(LightArrayRevolverScheduler.scala:305)
>         at akka.actor.LightArrayRevolverScheduler$$anon$4.nextTick(LightArrayRevolverScheduler.scala:270)
>         at akka.actor.LightArrayRevolverScheduler$$anon$4.run(LightArrayRevolverScheduler.scala:236)
>         at java.lang.Thread.run(Thread.java:748)
> 2020-05-07 18:27:35,725 ERROR org.apache.flink.runtime.util.FatalExitExceptionHandler       - FATAL: Thread 'flink-metrics-8' produced an uncaught exception. Stopping the process...
> java.lang.OutOfMemoryError: Java heap space
> 2020-05-07 18:27:35,725 ERROR com.rabbitmq.client.impl.ForgivingExceptionHandler            - An unexpected connection driver error occured
> java.lang.OutOfMemoryError: Java heap space
>         at com.rabbitmq.client.impl.Frame.readFrom(Frame.java:120)
>         at com.rabbitmq.client.impl.SocketFrameHandler.readFrame(SocketFrameHandler.java:164)
>         at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:580)
>         at java.lang.Thread.run(Thread.java:748)
> {code}
>  
> [https://stackoverflow.com/questions/61465789/how-do-i-create-a-flink-richparallelsourcefunction-with-backpressure]
>  
>  
>  It seems that I am suppose guess how much my sink can handle and throttle to that amount in my source generator. But that always puts my system of a risk of crashing. 
>  
>  
>  



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