[YARN-4901] QueueMetrics needs to be cleared before MockRM is initialized

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.3.0, 3.2.2, 3.1.4, 2.10.1
• Component/s: scheduler
• Hadoop Flags: Reviewed
• Assignee: Peter Bacsko
• Reporter: Daniel Templeton
• Created: 30/Mar/16 21:55
• Updated: 26/Feb/20 05:29
• Resolved: 03/Apr/19 13:28

Description

The ResourceManager rightly assumes that when it starts, it's starting from naught. The MockRM, however, violates that assumption. For example, in TestNMReconnect, each test method creates a new MockRM instance. The QueueMetrics.queueMetrics field is static, which means that when multiple MockRM instances are created, the QueueMetrics bleed over. Having the MockRM clear the QueueMetrics when it starts should resolve the issue. I haven't looked yet at scope to see how hard easy that is to do.

Issue Links

• is depended upon by: YARN-10012 Guaranteed and max capacity queue metrics for custom resources
• is related to: YARN-4983 JVM and UGI metrics disappear after RM is once transitioned to standby mode
• is related to: YARN-9431 Fix flaky junit test fair.TestAppRunnability after YARN-8967