IoSession in PREPARING state is not removed from queue

[Victor]

Hello mina developers!

Seems I have found a bug with IoSession (or I am doing something wrong 
:) ) - I can see that a "PREPARING" session is not removed correctly 
from queue.

When some session is in PREPARING state, it is removed from 
"removingSessions" queue but right after that it is added to this queue 
again! So this session is added to the queue and removed from it until 
forever.
As a result, this give us significant garbage allocation, so CPU spends 
most of time in garbage collector (I can see this is JConsole).

I see comments there in AbstractPollingIoProcessor class:

private int remove() {
...
        case PREPARING:
                // Retry later if session is not yet fully initialized.
                // (In case that Session.close() is called before 	 
addSession() is processed)
                scheduleRemove(session);
                return removedSessions;
...
}

I have added logging to this code, and I can see that the SAME session 
is removed and added again and again.

Can somebody explain this logic please? Why don't we remove the PENDING 
 session? Or maybe is there a workaround for this.

Sorry, I can not provide a test for this issue, but it is reproduced 
almost every day at out production servers under some load. Maybe, you 
can reproduce it by adding a delay in addSession() and then closing the 
session during this delay.

Thanks for any ideas and propositions,

Victor