[NIFI-4143] Make configurable maximum number of concurrent requests

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.4.0
• Component/s: Core Framework
• Labels: documentation
• Assignee: Pierre Villard
• Reporter: Pierre Villard
• Created: 29/Jun/17 17:02
• Updated: 06/Jul/17 19:40
• Resolved: 06/Jul/17 19:40

Description

At the moment, the maximum number of concurrent requests is hard coded in ThreadPoolRequestReplicator

https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-cluster/src/main/java/org/apache/nifi/cluster/coordination/http/replication/ThreadPoolRequestReplicator.java

The value is equal to 100.

In some situations where multiple factors are combined (large cluster, S2S to load balance data in the cluster, multiple users accessing the UI), the limit can be reached and the UI may become intermittently unavailable with the message: "There are too many outstanding HTTP requests with a total 100 outstanding requests".

This value should be configurable in nifi.properties allowing users to increase the value.

Issue Links

• links to: GitHub Pull Request #1962