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

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-18409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Kyle Purtell reopened HBASE-18409:
-----------------------------------------

Had to resolve and reopen to kick status back to open.

> Migrate Client Metrics from codahale to hbase-metrics
> -----------------------------------------------------
>
>                 Key: HBASE-18409
>                 URL: https://issues.apache.org/jira/browse/HBASE-18409
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client, java, metrics
>    Affects Versions: 3.0.0-alpha-1
>            Reporter: Ronald Macmaster
>            Priority: Critical
>              Labels: newbie
>         Attachments: 0001-HBASE-18409-MetricsConnection-client-metrics-migration.patch, 0002-HBASE-18409-MetricsConnection-client-metrics-migrati.patch, 0003-HBASE-18409-MetricsConnection-client-metrics-migration.patch, 0004-HBASE-18409-MetricsConnection-client-metrics-migration.patch
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> 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. 
> Now that we have an actual hbase-metrics-api that master, regionserver, zookeeper, and other daemons 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. 
> I found this to be a necessary change after attempting to implement my own Reporter to use within the MetricsConnection class.
> I was attempting to create a HadoopMetrics2Reporter that extends the codahale ScheduledReporter and reports the MetricsConnection metrics to Hadoop's metrics2 system. 
> The already existing infrastructure in the hbase-metrics and hbase-metrics-api projects could be easily leveraged for a cleaner solution.
> If completed successfully, users could instead access their client-side metrics through the hbase-metrics-api. 



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