diff -r 851a389fc54d -r 2c3578aa0bdf src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/AbstractEventStream.java
--- a/src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/AbstractEventStream.java	Fri Nov 29 15:37:13 2019 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/AbstractEventStream.java	Fri Nov 29 17:31:01 2019 +0100
@@ -76,9 +76,10 @@
     abstract public void close();
 
     protected final Dispatcher dispatcher() {
-        if (configuration.hasChanged()) {
+        if (configuration.hasChanged()) { // quick check
             synchronized (configuration) {
                 dispatcher = new Dispatcher(configuration);
+                configuration.setChanged(false);
             }
         }
         return dispatcher;