[FLINK-4064] Allow calling MetricGroup methods multiple times

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.1.0
• Component/s: Runtime / Metrics
• Assignee: Unassigned
• Reporter: Aljoscha Krettek
• Created: 13/Jun/16 12:39
• Updated: 02/Oct/19 17:50
• Resolved: 15/Jun/16 12:06

Description

Right now, the methods on MetricGroup can only be called once, i.e. I have to keep the result of MetricGroup.counter(name) and use that to report metrics. For some cases, such as adding metrics support in triggers, it is necessary to allow calling a method multiple times and return the same metric object. On the first call, a new metric object would be created, subsequent calls would return that metric object.