[FLINK-32217] Retain metric store can cause NPE

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.17.0
• Fix Version/s: 1.18.0, 1.16.3, 1.17.2
• Component/s: Runtime / Metrics, Runtime / REST
• Labels: pull-request-available
• Assignee: Junrui Li
• Reporter: Junrui Li
• Created: 30/May/23 09:23
• Updated: 05/Jun/23 08:20
• Resolved: 05/Jun/23 08:20

Description

When metricsFetcher fetches metrics, it will update the metricsStore (here). But in this method, it can get null metricStore and cause NPE, which will lead to incorrect results of metrics retain, and we should also fix it from the perspective of stability.

Issue Links

• links to: GitHub Pull Request #22680