Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/2206
Since the types serialized by the method are not user provided, but from
Kafka, I think that is an unlikely scenario.
I looked again through the stack trace reported in the JIRA, and we can
also catch the exception in the `AccumulatorRegistry.getSnapshot()` method, by
catching all exceptions, not just IOExceptions.
I'll update the PR.
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