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From AJ Slater>
Subject Re: Occasional 10s Timeouts on Read
Date Sun, 20 Jun 2010 01:22:36 GMT
tcpdump shows bidirectional communication with ACKs during a known
problem period. I did not have TRACE logging going during the period I
have tcpdump logs, but I assume that an  'INFO error connecting to' is
probably caused by ConnectExceptions

For instance...

lpc03:~$ telnet fs02 7000

...connects during the problem period.

I wish the ConnectException contained port information to be very sure
of what it was trying to attempt. But my setup uses default Gossip
ports. The only interface thing that's non-standard is that the JMX
ports are set to 8081 on all hosts.

Hopefully I'll be able to do another experiment in an hour or so, but
then going camping for a couple days.


On Sat, Jun 19, 2010 at 5:05 PM, Peter Schuller
<> wrote:
>> TRACE 14:42:06,248 unable to connect to /
>> Connection refused
>>        at Method)
> So that's interesting since it is a clear failure that comes from the
> operating system and indicates something which can be observed outside
> of cassandra using system tools. Presumably either cassandra is
> somehow connecting to the wrong port, or this is a
> firewalling/os/network issue, or the 'other' cassandra is not
> listening on the port. Using tcpdump/netstat -nlp should narrow that
> down.
> Is it possible connections only succeed in one direction for example?
> --
> / Peter Schuller

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