[jira] [Created] (HBASE-22407) add an option to use Hadoop metrics tags for table metrics (and fix some issues in metrics)

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

Sergey Shelukhin created HBASE-22407:
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             Summary: add an option to use Hadoop metrics tags for table metrics (and fix some issues in metrics)
                 Key: HBASE-22407
                 URL: https://issues.apache.org/jira/browse/HBASE-22407
             Project: HBase
          Issue Type: Bug
            Reporter: Sergey Shelukhin
            Assignee: Sergey Shelukhin


Currently table metrics are output using custom metrics names that clutter various metrics lists and are impossible to (sanely) aggregate.
We can use Hadoop MetricsTag to instead use tagging on a single metric (for a given logical metric), allowing both per-table display and cross-table aggregation on the other end.

In this JIRA (patch coming) I'd like to add the ability to do that
1) Actual tagging in multiple paths that output table metrics.
2) The ugliest part - preventing server-level metrics from being output in tags case to avoid duplicate metrics. Seems like a large refactor of the metrics is in order (not included)...
3) Fixes for some issues where wrong metrics are output, metrics are not output at all, exceptions like null Optional cause table metrics to not be output forever, etc.
4) Renaming several table-level latency metrics to be consistent with server-level latency metrics.



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