Re: outrigger "I/O error reading from mux connection"

On 15/09/2005, at 0:30, John W. F. Mcclain wrote:

> I think Gregg is probably right. Logging the
> "writing EntryRep[com.ca.jini.space.hello.StdioHelloEntry] (txn =
> null)"
> message is pretty much the last thing the server side write
> method does before returning the necessary info to create the lease
> in the client. At this point the entry has
> been made visible to other threads (and if this was a persistent space
> made durable). Is the client doing the take doing a blocking
> take? If yes my guess is that when the write happens there is a query
> from a previous, but now dead, instance of the taking client still
> in progress, that take gets the newly written entry, the entry
> gets dumped on the floor (since the previous client is dead)
> and JERI's java.io.EOFException occurs when JERI turns around
> to get the next call from the dead taking client.
>
> See this post for a longer discussion of this issue:
>
>   http://archives.java.sun.com/cgi-bin/wa?A2=ind0405&L=javaspaces-
> users&P=R2084&I=-3
>
> If you are not doing a blocking take or there was no previous
> instance of the taking client, I need more info....
>
> Hope this helps, if not we can try again....

Yep, I think you nailed it. My receiver is doing a blocking take with
Long.MAX_VALUE timeout. Because of the simplistic nature of my test
code, I was just doing a ctrl-c when I needed to stop and restart the
clients. A few more tests confirmed that the problem occurs only
after I ctrl-c the taking process. It always seems obvious in hindsight.

So, if I understand the messages you referenced correctly, this is an
inherent problem with distributed computing and using a transaction
is the standard way to deal with it?

Thank you everyone for your responses. As a newbie to Javaspaces,
it's certainly encouraging to receive such a level of assistance.

--
Lachlan O'Dea
Computer Associates
Senior Software Engineer
tel: +61 3 8416 5627
fax: +61 3 8416 5810
mobile: +61 412 390 650
[email protected]

Relax and enjoy your shoes!



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