Merge pull request #52 from elandau/feature/gradient_tweak

Smooth gradient limit increase

Author: elandau

concurrency-limits-core/src/main/java/com/netflix/concurrency/limits/limit/GradientLimit.java

@@ -270,13 +270,14 @@ public synchronized void update(SampleWindow sample) {
             newLimit = estimatedLimit * gradient + queueSize;
         }
 
+        // Apply a smoothing factor when reducing the limit only
+        newLimit = (1-smoothing) * estimatedLimit + smoothing*(newLimit);
+        newLimit = Math.max(Math.max(minLimit, queueSize), Math.min(maxLimit, newLimit));
+
         if ((int)newLimit != (int)estimatedLimit) {
             // Don't grow the limit because we are app limited
             if (sample.getMaxInFlight() < estimatedLimit / 2) {
                 return;
-            // Apply a smoothing factor when reducing the limit only
-            } else if (newLimit < estimatedLimit) {
-                newLimit = (1-smoothing) * estimatedLimit + smoothing*(newLimit);
             }
 
             if (LOG.isDebugEnabled()) {
@@ -289,7 +290,6 @@ public synchronized void update(SampleWindow sample) {
             }
         }
 
-        newLimit = Math.max(Math.max(minLimit, queueSize), Math.min(maxLimit, newLimit));
         estimatedLimit = newLimit;
     }