[jira] [Created] (HBASE-18409) Migrate Client Metrics from codahale to hbase-metrics

["Ronald Macmaster (JIRA)" <ji...@apache.org>]

Ronald Macmaster created HBASE-18409:
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             Summary: Migrate Client Metrics from codahale to hbase-metrics
                 Key: HBASE-18409
                 URL: https://issues.apache.org/jira/browse/HBASE-18409
             Project: HBase
          Issue Type: Bug
          Components: Client, java, metrics
    Affects Versions: 2.0.0-alpha-1
            Reporter: Ronald Macmaster


Currently, the metrics for hbase-client are tailored for reporting via a client-side JMX server.
The MetricsConnection handles the metrics management and reporting via the metrics platform from codahale. This approach worked well for hbase-1.3.1 when the metrics platform was still relatively young, but it could be improved by using the new hbase-metrics-api. 

However, now that we have an actual hbase-metrics-api that master, regionserver, zookeeper, and others use, it would be good to also allow the client to leverage the metrics-api. Then, the client could also report its metrics via Hadoop's metrics2 if desired or through another platform that utilizes the hbase-metrics-api. If left alone, client metrics will continue to be only barely visible through a client-side JMX server.

The migration to the new metrics-api could be done by simply changing the Metrics data types from codahale types to hbase-metrics types without changing the metrics signatures of MetricsConnection unless completely necessary. The codahale MetricsRegistry would also have to be exchanged for a hbase-metrics MetricsRegistry. 




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