Tim Brooks created KAFKA-2101:
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Summary: Metric metadata-age is reset on a failed update
Key: KAFKA-2101
URL: https://issues.apache.org/jira/browse/KAFKA-2101
Project: Kafka
Issue Type: Bug
Reporter: Tim Brooks
In org.apache.kafka.clients.Metadata there is a lastUpdate() method that
returns the time the metadata was lasted updated. This is only called by
metadata-age metric.
However the lastRefreshMs is updated on a failed update (when MetadataResponse
has not valid nodes). This is confusing since the metric's name suggests that
it is a true reflection of the age of the current metadata. But the age might
be reset by a failed update.
Additionally, lastRefreshMs is not reset on a failed update due to no node
being available. This seems slightly inconsistent, since one failure condition
resets the metrics, but another one does not. Especially since both failure
conditions do trigger the backoff (for the next attempt).
I have not implemented a patch yet, because I am unsure what expected behavior
is.
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