Re: [jgroups-dev] Gossip router

Hmm, although I *think* we should catch and handle 
SocketConnectionTimeout, this doesn't seem to be the issue (can you 
create a JIRA and fix this nevertheless ?)...

I think the real issue is that EC2's termination does NOT invoke the 
shutdown scripts run in runlevel 0 ! This way, the virtual instance is 
killed but the TCP sockets are not closed. So the GossipRouter would 
wait with removing a clients entry until the socket's keepalive timeout 
kicked in (if set !), and this might take 2 hrs or so !

I reproduced this issue with vmware:

    * Run an instance of JBoss in vmware (192.168.1.11)
    * It connects to the GossipRouter running locally, on 192.168.1.5:12001
    * Power off the virtual instance
          o This does NOT invoke the Kxxx scripts in runlevel 0, so
            JBoss is not killed
          o Also, it simply shuts down the vmware instance, without
            killing any sockets !
          o shutdown -h now invoked in the virtual instance works and
            correctly kills JBoss


This gives us some headaches for GossipRouter: if someone running GR in 
the cloud simply uses the GUI or a command to power off (or terminate) 
an instance, GR won't remove that entry for a long time, possibly never !

Let's chat about this today, maybe we have to go back to having GR ping 
registered instances and remove inactive ones...



Vladimir Blagojevic wrote:
> Hey Bela,
>
> The only way I can envision that ConnectionHandler in GR is not being cleaned up is that somehow we continue have a connection in a state that does not throw IOException nor Exception but only SocketTimeoutException. Have a look at ConnectionHandler#runLoop exception handling. Also ConnectionHandler#run - as soon as readLoop terminates tcp connection is cleanup explicitly.
>
> What are you thinking?
>
> --
> Vladimir Blagojevic
> JBoss Clustering Team
> JBoss by Red Hat
>
>
>
>
>   

-- 
Bela Ban
Lead JGroups / Clustering Team
JBoss


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