Fix race condition in rdkafka statistics #6206
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If metrics for a topic or partition are missing, don't abort. Continue processing the rest of the metrics instead. Eventually the metrics should show up. Add a test case to verify that the metrics are synchronized eventually. Fixes #6204
cirego
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benesch
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Mar 25, 2021
philip-stoev
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Apr 6, 2021
If metrics for a topic or partition are missing, don't abort. Continue processing the rest of the metrics instead. Eventually the metrics should show up. Add a test case to verify that the metrics are synchronized eventually. Fixes #6204
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There appears to be a race where a partition consumer can be aware of a partition before rdkafka decides to populate the statistics data structure for that partition.
We had two unchecked gets from the statistics data structure. Convert both of those gets to checked versions, where we simply ignore statistics for that topic / partition if it's missing. Add a test case to verify that the metrics are populated eventually.
First noticed when this started failing in CI for #6192.
This change is