Petr Novotnik created FLINK-6947:
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Summary: Warn on
Key: FLINK-6947
URL: https://issues.apache.org/jira/browse/FLINK-6947
Project: Flink
Issue Type: Improvement
Components: DataStream API
Affects Versions: 1.2.1, 1.3.0
Reporter: Petr Novotnik
Priority: Minor
Placing timestamp assignment (and watermark generation) directly or indirectly
after a union is generally not desirable as it may lead to surprising results
at the client side. Ideally, timestamp assignment (and watermark generation) is
best placed as close as possible to the data sources. It would be nice to
generate a warning to the user (i.e. to the log) before job execution if the
framework detects timestamp assignment (directly or indirectly placed) after a
union.
Some more background information for this issue can be found in this email
thread:
http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/union-followed-by-timestamp-assignment-watermark-generation-td13036.html
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