[IMPALA-2038] Create Derived Metric Type

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: Product Backlog
• Fix Version/s: Product Backlog
• Component/s: Backend
• Labels: ramp-up
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: Martin Grund
• Created: 29/May/15 20:38
• Updated: 19/Jun/17 23:24
• Resolved: 19/Jun/17 23:24

Description

We should add a new metric type that can be defined as a derived metric from one or more input sources. One example is a ratio metric that divides to count values.

A possible consumer is the HDFS FD caching hit/miss ratio that is currently defined as a stats metric.