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From Damien Katz <dam...@apache.org>
Subject Re: mochiweb unstable?
Date Tue, 15 Jul 2008 21:43:05 GMT
Okay, now I've confirmed the HTTP client is sending the POST more than  
once. Perhaps it is a the TCP layer resending packets? Curiouser and  
curiouser....


On Jul 15, 2008, at 4:46 PM, Damien Katz wrote:

> Okay, so I went ahead and did a little debugging. For reasons  
> unknown, mochiweb is getting a network error, causing us to crash.  
> Then it appears mochiweb attempts the same request again. This is  
> fine for GET PUT and DELETE, they'll error out if attempted twice,  
> but it also does it for POST during the creation of new documents.  
> This it would seem is the source of duplicate documents some people  
> see?
>
>
> On Jul 15, 2008, at 2:03 PM, Damien Katz wrote:
>
>> I'm a bit worried about mochiweb right now. It appears that  
>> somehow, perhaps via a timing bug, mochiweb can get into a weird  
>> state and start returning the wrong response to a http request. It  
>> seems sometimes you get the result from a previous request, instead  
>> of the current request. This can be any type of request it seems,  
>> GET PUT or POST.  We see the problem consistently when running the  
>> tests from Safari, some people see it from Firefox too. The current  
>> theory is that Safari is faster and causes the timing bug more  
>> consistently than firefox.
>>
>> This is a very bad thing. If our network interface doesn't give  
>> back correct results, then how can we call ourselves a database? If  
>> necessary, we'll have to revert back to the old inets httpd  
>> library. It may have been quirky, slow and under-documentend, but  
>> it was pretty solid once working. I hope that's not necessary.
>>
>> Right now I think this bug is the highest priority and anyone is  
>> welcome to attack it.  https://issues.apache.org/jira/browse/COUCHDB-95
>>
>> I don't have time this week to debug it, but if its still a problem  
>> by next week I'll start debugging and poking around more thoroughly  
>> inside mochiweb.
>>
>> Any input or help is welcomed.
>>
>> -Damien
>


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