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

Lachlan O'Dea wrote:
> 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?
>

Yes indeed - you're correct.

I wrote a few notes on this stuff here:

http://www.dancres.org/cottage/javaspaces.html#commonques

Just to add another piece of background.

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

No problems - don't hesitate to email again.

Dan.

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