[FLINK-10247] Run MetricQueryService in separate thread pool

• Type: Sub-task
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.5.3, 1.6.0, 1.7.0
• Fix Version/s: 1.7.0
• Component/s: Runtime / Metrics
• Labels: pull-request-available
• Release Note: The metric query service runs now in its own ActorSystem. It needs consequently to open a new port for the query services to communicate with each other. This port can be configured via `metrics.internal.query-service.port` and is set by default to `0`.
• Assignee: Shimin Yang
• Reporter: Till Rohrmann
• Created: 29/Aug/18 07:48
• Updated: 02/Oct/19 17:49
• Resolved: 16/Oct/18 22:36

Description

In order to make the MetricQueryService run independently of the main Flink components, it should get its own dedicated thread pool assigned.

Issue Links

• links to: GitHub Pull Request #6676
• links to: GitHub Pull Request #6759