Concurrent requests to JanusGraphServer- Exception: Failed to authenticate, when connection pool size is >1

[devcode100]

Hi All,
I am facing issue when trying to load test with concurrent requests to gremlin server of JanusGraph.
Backend: cassandra
Single node set up.

	GraphTraversalSource initializegraphCluster() {

		cluster = Cluster.build().port(janusgraphServerPort).addContactPoint(janusgraphServerHost)
				.credentials(janusgraphServerUserName, janusgraphServerPassword).create();
		DriverRemoteConnection connection = DriverRemoteConnection.using(cluster);
		GraphTraversalSource g = new GraphTraversalSource(connection);
		return g;

	}

The GraphTraversalSource object is created once and used across the application.

When tried to load test(using default gremlin driver Cluster settings for connection pool (min 2 , max 8)) starting with 100req/sec, getting below error and around 80% requests failed.
Error: org.apache.tinkerpop.gremlin.driver.exception.ResponseException: Failed to authenticate
The simple logic : g.V().hasLabel("god").count() is been run in the request
Seems like a Gremlin issue or is there any configuration tuning to be made?
The only way I could solve this was by increasing the connection pool closer to concurrent requests, but may not be the ideal approach for a throughput for 1K req/sec(optimistic)
If the connection pool is set to (min 1 , max 1) all requests succeeds without authentication issue, when connection pool > 1 then the failed to authenticate issue occurs.

How can I effectively scale the concurrent requests in JanusGraph?
It will be great if I get recommendations for a production rollout.

Requesting your insights