250 connections with 2 partitions may be a bit too extreme.

unfiltered/src/main/resources/application.conf

@@ -3,6 +3,6 @@ db.default.url = "jdbc:mysql://localhost:3306/hello_world"
 db.default.user = "benchmarkdbuser"
 db.default.password = "benchmarkdbpass"
 db.default.minConnections = 4
-db.default.maxConnections = 250
+db.default.maxConnections = 125
 
 unfiltered.maxThreads = {threads}