Improve Kafka internal metrics
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Key: KAFKA-203
URL: https://issues.apache.org/jira/browse/KAFKA-203
Project: Kafka
Issue Type: New Feature
Components: core
Reporter: Jay Kreps
Assignee: Jay Kreps
Currently metrics in kafka are using old-school JMX directly. This makes adding
metrics a pain. It would be good to do one of the following:
1. Convert to Coda Hale's metrics package (https://github.com/codahale/metrics)
2. Write a simple metrics package
The new metrics package should make metrics easier to add and work with and
package up the common logic of keeping windowed gauges, histograms, counters,
etc. JMX should be just one output of this.
The advantage of the Coda Hale package is that it exists so we don't need to
write it. The downsides are (1) introduces another client dependency which
causes conflicts, and (2) seems a bit heavy on design. The good news is that
the metrics-core package doesn't seem to bring in a lot of dependencies which
is nice, though the scala wrapper seems to want scala 2.9. I am also a little
skeptical of the approach for histograms--it does sampling instead of bucketing
though that may be okay.
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