Re: Connection reset

Peter, thanks for your reply.

--- Peter Jones - JavaSoft East
<[email protected]> wrote:

> It appears that the client was in the middle of
> unmarshalling a HashMap contained in the return
> value of a "getDataSet" invocation when the
> exception occurred.

I got that far in my understanding ... by the way,
this HashMap could be quite large, does that make a
difference?

> As the client was trying to read from the
connection,
> if the server closed its socket because of this
> timeout, the client should get an EOFException, not
> a connection reset indication.
>
> The two hour delay and the connection reset failure
> might suggest that the TCP keepalive mechanism
> triggered the failure. But that would seem to
> indicate that TCP segments between the client and
> server machines were getting dropped at some point.
> Does other communication between them seem to work
> throughout this period?
>

Hmm, interesting - since it's late at night I would
have to consult with our network admins to see if they
had noticed any connection problems.

> How reproducible is this failure-- always,
> occasionally, etc.?
>

It's occasionally reproducible (and seems to go away
when I enable RMI logging, grrr...)

> Have you gotten thread dumps from the client and
> server VMs during this two hour period?  "netstat"
> output on the client and server machines during
> this period?
>

No, but I'll try next time I observe the problem.

We do have upstream retry procedures in place, but
obviously they are not triggered by a simple client
freeze.  What I was trying to do with the
sun.rmi.transport.tcp.readTimeout property was provoke
this crash earlier, so that we don't waste 2 hours of
machine time. Is there another property I should be
playing with?

Thanks for your help,
Robert



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