[FLINK-3182] TaskManagersHandler can block web frontend

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 0.10.1
• Fix Version/s: 1.4.0
• Component/s: Runtime / Web Frontend
• Assignee: Unassigned
• Reporter: Ufuk Celebi
• Created: 17/Dec/15 15:50
• Updated: 03/Sep/17 22:03
• Resolved: 03/Sep/17 22:03

Description

In TaskManagersHandler:

Future<Object> future = jobManager.ask(
    new JobManagerMessages.RequestTaskManagerInstance(instanceID),
    timeout);

TaskManagerInstance instance = (TaskManagerInstance) Await.result(
    future,
    timeout);

The default timeout is 10 seconds. Depending on the number of event loop threads and requests this can block the web server.

Issue Links

• duplicates: FLINK-7409 WebRuntimeMonitor blocks serving threads