Now that we track when sessions have been persisted (or were loaded f…

…rom persistence) in each thread and have good dirty session detection, we shouldn't need to serialize the session into Redis unless it is not yet persisted or has changed.

src/main/java/com/radiadesign/catalina/session/RedisSessionManager.java

@@ -385,14 +385,11 @@ public void save(Session session) throws IOException {
 
       redisSession.resetDirtyTracking();
       byte[] binaryId = redisSession.getId().getBytes();
-      byte[] data = serializer.serializeFrom(redisSession);
 
       jedis = acquireConnection();
 
       if (sessionIsDirty || currentSessionIsPersisted.get() != true) {
-        jedis.set(binaryId, data);
-      } else {
-        jedis.setnx(binaryId, data);
+        jedis.set(binaryId, serializer.serializeFrom(redisSession));
       }
 
       currentSessionIsPersisted.set(true);