[IMPALA-6545] Return structured JSON for metrics on /rpcz debug page

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: Impala 3.0, Impala 2.12.0
• Fix Version/s: Not Applicable
• Component/s: Backend
• Labels: metrics observability rpc
• Epic Color: ghx-label-9
• Assignee: Unassigned
• Reporter: Lars Volker
• Created: 20/Feb/18 19:02
• Updated: 02/Apr/18 20:44
• Resolved: 02/Apr/18 20:30

Description

We currently return histograms as human readable string on /rpcz, both for the rendered HTML version and for the JSON version returned by /rpcz?json. Instead, we should return the same JSON that we return for Impala's histograms on /metrics.

"name": "rpc-method.backend.ImpalaInternalService.CancelQueryFInstances.call_duration",
"description": "",
"human_readable": "Count: 1, min / max: 0 / 0, 25th %-ile: 0, 50th %-ile: 0, 75th %-ile: 0, 90th %-ile: 0, 95th %-ile: 0, 99.9th %-ile: 0",
"25th %-ile": 0,
"50th %-ile": 0,
"75th %-ile": 0,
"90th %-ile": 0,
"95th %-ile": 0,
"99.9th %-ile": 0,
"max": 0,
"min": 0,
"count": 1,
"kind": "HISTOGRAM",
"units": "TIME_MS"