Charly Molter created KAFKA-6310:
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Summary: ConcurrentModificationException when reporting
requests-in-flight in producer
Key: KAFKA-6310
URL: https://issues.apache.org/jira/browse/KAFKA-6310
Project: Kafka
Issue Type: Bug
Components: metrics, network
Affects Versions: 1.0.0
Reporter: Charly Molter
We are running in an issue really similar to KAFKA-4950.
We have a producer running and a MetricsReporter with a background thread which
publishes these metrics.
The concurrent exception happens when calling `InFlightRequests.count()` in one
thread when a connection or disconnection is happening.
In this case one thread is iterating over the map while another is
adding/removing from it thus causing the exception.
We could potentially fix this with a volatile like in KAFKA-4950.
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