Robert Metzger created FLINK-15327:
--------------------------------------

             Summary: 'Walkthrough DataStream Scala nightly' sometimes fails 
with InterruptedException
                 Key: FLINK-15327
                 URL: https://issues.apache.org/jira/browse/FLINK-15327
             Project: Flink
          Issue Type: Improvement
          Components: Examples, Tests
    Affects Versions: 1.11.0
            Reporter: Robert Metzger


The "Walkthrough DataStream Scala nightly end-to-end test" 
(test_datastream_walkthroughs.sh) failed with the following error found in the 
log 

 
 
{code:java}
 2019-12-18 17:54:15,698 INFO  
org.apache.flink.runtime.taskexecutor.TaskExecutor            - Un-registering 
task and sending final execution state CANCELED to JobManager for task 
fraud-detector -> Sink: send-alerts 018084fed67f928895eb79668f0143e0.2019-12-18 
17:54:15,698 INFO  org.apache.flink.runtime.taskexecutor.TaskExecutor           
 - Un-registering task and sending final execution state CANCELED to JobManager 
for task fraud-detector -> Sink: send-alerts 
018084fed67f928895eb79668f0143e0.2019-12-18 17:54:15,707 WARN  
org.apache.flink.streaming.runtime.tasks.StreamTask           - Error while 
canceling task.java.lang.RuntimeException: java.lang.InterruptedException: 
sleep interrupted at 
org.apache.flink.walkthrough.common.source.TransactionSource$RateLimitedIterator.next(TransactionSource.java:60)
 at 
org.apache.flink.streaming.api.functions.source.FromIteratorFunction.run(FromIteratorFunction.java:43)
 at 
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:100)
 at 
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:63) 
at 
org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:196)Caused
 by: java.lang.InterruptedException: sleep interrupted at 
java.lang.Thread.sleep(Native Method) at 
org.apache.flink.walkthrough.common.source.TransactionSource$RateLimitedIterator.next(TransactionSource.java:58)
 ... 4 more2019-12-18 17:54:15,717 INFO  
org.apache.flink.runtime.taskmanager.Task                     - Source: 
transactions (1/1) (8bfc09b3dac838c3c1fe1a9da40b2c37) switched from CANCELING 
to CANCELED.2019-12-18 17:54:15,718 INFO  
org.apache.flink.runtime.taskmanager.Task                     - Freeing task 
resources for Source: transactions (1/1) 
(8bfc09b3dac838c3c1fe1a9da40b2c37).2019-12-18 17:54:15,718 INFO  
org.apache.flink.runtime.taskmanager.Task                     - Ensuring all 
FileSystem streams are closed for task Source: transactions (1/1) 
(8bfc09b3dac838c3c1fe1a9da40b2c37) [CANCELED]

{code}
 

Run: 
[https://dev.azure.com/rmetzger/Flink/_build/results?buildId=3742&view=logs&j=b1623ac9-0979-5b0d-2e5e-1377d695c991&t=48867695-c47f-5af3-2f21-7845611247b9]

I assume this error happens only rarely.
 



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