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Posted to dev@flink.apache.org by "Seth Wiesman (Jira)" <ji...@apache.org> on 2020/02/20 19:52:00 UTC
[jira] [Created] (FLINK-16193) Improve error messaging when a key
is assigned to the wrong key group range
Seth Wiesman created FLINK-16193:
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Summary: Improve error messaging when a key is assigned to the wrong key group range
Key: FLINK-16193
URL: https://issues.apache.org/jira/browse/FLINK-16193
Project: Flink
Issue Type: Improvement
Components: API / DataStream
Affects Versions: 1.11.0
Reporter: Seth Wiesman
Occasionally, users may run into an exception that reads something like:
{{java.lang.IllegalArgumentException: Key group 45 is not in KeyGroupRange\{startKeyGroup=0, endKeyGroup=42}}}
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This may be caused by a number of issues including:
1) Unstable hash and equals methods on their key objects
2) Improper use of DataStreamUtils#reinterpretAsKeyedStream
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{{Key group ranges are a fairly low level detail that most users will be unfamiliar with when working with Flink. We should offer more comprehensive error messaging that outlines likely causes and solutions.}}
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