[HBASE-17016] Reimplement per-region latency histogram metrics

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.4.0, 2.0.0
• Component/s: metrics
• Assignee: Unassigned
• Reporter: Andrew Kyle Purtell
• Created: 03/Nov/16 18:29
• Updated: 12/Dec/17 16:46
• Resolved: 12/Dec/17 16:46

Description

Follow up from HBASE-10656, where enis says:

the main problem is that we have A LOT of per-region metrics that are latency histograms. These latency histograms create many many Counter / LongAdder objects. We should get rid of per-region latencies and maybe look at reducing the per-region metric overhead.

And ghelmling gives us a good candidate to implement pre-region latency histograms HdrHistogram.

Let's consider removing the per-region latency histograms and reimplement using HdrHistogram.