[FLINK-4775] Simplify access to MetricStore

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1.2
• Fix Version/s: 1.2.0
• Component/s: Runtime / Metrics, Runtime / Web Frontend
• Assignee: Chesnay Schepler
• Reporter: Chesnay Schepler
• Created: 07/Oct/16 15:01
• Updated: 21/Oct/16 12:00
• Resolved: 21/Oct/16 12:00

Description

A few utility methods can be added to the MetricStore, which would make working with it a lot easier.

This includes getXMetricStore(args) methods that, for example, return the appropriate TaskMetricStore, without requiring the accessor to traverse the structure(and do several null checks) themselves.

In addition, a getMetric(name, defaultValue) method would ease the issue of metrics not being updated yet.