Jun Rao created KAFKA-15058:
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Summary: Improve the accuracy of Histogram in client metric
Key: KAFKA-15058
URL: https://issues.apache.org/jira/browse/KAFKA-15058
Project: Kafka
Issue Type: Improvement
Components: clients
Reporter: Jun Rao
The Histogram type (org.apache.kafka.common.metrics.stats) in KafkaMetrics in
the client module statically divides the value space into a fixed number of
buckets and only returns values on the bucket boundary. So, the returned
histogram value may never show up in a recorded value. Yammer Histogram, on the
other hand, uses reservoir sampling. The reported value is always one of the
recorded values, and is likely more accurate. Because of this, the Histogram
type in client metric hasn't been used widely. It would be useful to improve
Histogram in the client metric to be more accurate.
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