Revert "Revert "Fixed AsyncIO double dispatch""

This reverts commit 8bd94ec6be2c597effa3fdcf44c5d3211767e7e8.
This is a revert of the revert to add back in the useful debug, plus some TODO comments describing the problems

1 files changed, 3 insertions, 1 deletions

diff --git a/jetty-io/src/main/java/org/eclipse/jetty/io/FillInterest.java b/jetty-io/src/main/java/org/eclipse/jetty/io/FillInterest.java
index de52bbd7cc..e3bc03ecca 100644
--- a/jetty-io/src/main/java/org/eclipse/jetty/io/FillInterest.java
+++ b/jetty-io/src/main/java/org/eclipse/jetty/io/FillInterest.java
@@ -60,6 +60,8 @@ public abstract class FillInterest
         }
         try
         {
+            if (LOG.isDebugEnabled())
+                LOG.debug("{} register {}",this,callback);
             needsFillInterest();
         }
         catch (Throwable e)
@@ -78,7 +80,7 @@ public abstract class FillInterest
             LOG.debug("{} fillable {}",this,callback);
         if (callback != null && _interested.compareAndSet(callback, null))
             callback.succeeded();
-        else
+        else if (LOG.isDebugEnabled())
             LOG.debug("{} lost race {}",this,callback);
     }