[jira] [Created] (HBASE-15518) Add Per-Table metrics back

["Enis Soztutar (JIRA)" <ji...@apache.org>]

Enis Soztutar created HBASE-15518:
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             Summary: Add Per-Table metrics back
                 Key: HBASE-15518
                 URL: https://issues.apache.org/jira/browse/HBASE-15518
             Project: HBase
          Issue Type: Sub-task
            Reporter: Enis Soztutar
            Assignee: Alicia Ying Shu
             Fix For: 2.0.0, 1.4.0


We used to have per-table metrics, but it was removed in some restructuring. We have per-region metrics, and per-regionserver metrics, but nothing in between. 

For majority of users, per-region is too granular, they are mostly interested in table level aggregates. This is especially useful in multi-tenant cases where a table's disk usage, number of requests, etc can be made much more visible. 

In this jira, we'll add the basic infrastructure to add a single (or a few) per-table metrics. Than we can improve on that by adding remaining metrics from the region server level. 

The plan is to NOT aggregate per-table metrics at master for now. Just aggregation of per-region metrics at the per-table level for every regionserver. 



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