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MongoCursorException with message: couldn't send query
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WennY  
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 More options Oct 9 2012, 11:27 pm
From: WennY <anty...@mail.ru>
Date: Tue, 9 Oct 2012 20:27:20 -0700 (PDT)
Local: Tues, Oct 9 2012 11:27 pm
Subject: MongoCursorException with message: couldn't send query
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Hello. When i try to connect, my php said: "PHP Fatal error: Uncaught
exception 'MongoCursorException' with message 'couldn't send query: [here
broken encoding]". Sure, it is not php problem. I think problem in mongo
connections. In the log I found the following:
if we have exception, in log we may see:
Wed Oct 10 07:03:15 [initandlisten] connection accepted from
127.0.0.1:60305 #9
Wed Oct 10 07:03:15 [conn9] end connection 127.0.0.1:60305

but if we have valid connection we always see:
Wed Oct 10 07:03:15 [initandlisten] connection accepted from
127.0.0.1:60306 #10
Wed Oct 10 07:03:16 [conn10] killcursors: found 0 of 1
Wed Oct 10 07:03:16 [conn10] end connection 127.0.0.1:60306

What is it and how fix it? Problem manifests in random time. Thx and sorry
for my eng :(


 
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Hannes Magnusson  
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 More options Oct 10 2012, 1:16 am
From: Hannes Magnusson <han...@10gen.com>
Date: Tue, 9 Oct 2012 22:16:34 -0700
Local: Wed, Oct 10 2012 1:16 am
Subject: Re: [mongodb-user] MongoCursorException with message: couldn't send query
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On Tue, Oct 9, 2012 at 8:27 PM, WennY <anty...@mail.ru> wrote:
> Hello. When i try to connect, my php said: "PHP Fatal error: Uncaught
> exception 'MongoCursorException' with message 'couldn't send query: [here
> broken encoding]". Sure, it is not php problem. I think problem in mongo
> connections. In the log I found the following:
> if we have exception, in log we may see:
> Wed Oct 10 07:03:15 [initandlisten] connection accepted from 127.0.0.1:60305
> #9
> Wed Oct 10 07:03:15 [conn9] end connection 127.0.0.1:60305

> but if we have valid connection we always see:
> Wed Oct 10 07:03:15 [initandlisten] connection accepted from 127.0.0.1:60306
> #10
> Wed Oct 10 07:03:16 [conn10] killcursors: found 0 of 1
> Wed Oct 10 07:03:16 [conn10] end connection 127.0.0.1:60306

We apparently don't kill the cursor when we encounter bad data... It
shouldn't cause any issues though.

We have seen this couple of times in virtualised environments, and we
suspect something is corrupting the network traffic...

Could you try to repair the database (using db.repairDatabase() from
the shell)? Note that it could take some time if you have a lot of
data.
You may want to try just validating the collection first (using
db.collectionName.validate(true)).

That should atleast make sure the database itself isn't at fault :)

-Hannes


 
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WennY  
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 More options Oct 10 2012, 1:43 am
From: WennY <anty...@mail.ru>
Date: Tue, 9 Oct 2012 22:43:53 -0700 (PDT)
Local: Wed, Oct 10 2012 1:43 am
Subject: Re: MongoCursorException with message: couldn't send query
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When trying validate, it say:
SyntaxError: missing ; before statement (shell):1
:(


 
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WennY  
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 More options Oct 10 2012, 6:14 am
From: WennY <anty...@mail.ru>
Date: Wed, 10 Oct 2012 03:14:25 -0700 (PDT)
Local: Wed, Oct 10 2012 6:14 am
Subject: Re: MongoCursorException with message: couldn't send query
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Hannes Magnusson  
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 More options Oct 10 2012, 8:17 pm
From: Hannes Magnusson <han...@10gen.com>
Date: Wed, 10 Oct 2012 17:17:25 -0700
Local: Wed, Oct 10 2012 8:17 pm
Subject: Re: [mongodb-user] Re: MongoCursorException with message: couldn't send query
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Looks fine.

Which driver version are you using?
Is this a virtualised environment?
Could you paste the exact query?
Is this a standalone instance running on localhost?

-Hannes


 
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WennY  
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 More options Oct 11 2012, 3:55 am
From: WennY <anty...@mail.ru>
Date: Thu, 11 Oct 2012 00:55:14 -0700 (PDT)
Local: Thurs, Oct 11 2012 3:55 am
Subject: Re: MongoCursorException with message: couldn't send query
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*Which driver version are you using?*

php driver file version - 1.2.12.0

*Is this a virtualised environment?*

No

*Could you paste the exact query?*

From php - find(array('userId' => 'ololonickname')). Which clean request -
dont know :(

*Is this a standalone instance running on localhost?*

Yeah


 
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WennY  
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 More options Oct 12 2012, 8:29 am
From: WennY <anty...@mail.ru>
Date: Fri, 12 Oct 2012 05:29:31 -0700 (PDT)
Local: Fri, Oct 12 2012 8:29 am
Subject: Re: MongoCursorException with message: couldn't send query
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The problem not in driver! I've got it from shell:
<http://imageshack.us/scaled/landing/513/errorexample.jpg>


 
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WennY  
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 More options Oct 12 2012, 8:35 am
From: WennY <anty...@mail.ru>
Date: Fri, 12 Oct 2012 05:35:17 -0700 (PDT)
Local: Fri, Oct 12 2012 8:35 am
Subject: Re: MongoCursorException with message: couldn't send query
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And corrupted error: "remote host forcibly severed connection "


 
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Jeremy Mikola  
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 More options Oct 12 2012, 4:09 pm
From: Jeremy Mikola <jmik...@gmail.com>
Date: Fri, 12 Oct 2012 13:09:50 -0700 (PDT)
Local: Fri, Oct 12 2012 4:09 pm
Subject: Re: MongoCursorException with message: couldn't send query
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If the database validated and this is manifesting itself in both the PHP
driver and shell, I would suspect some sort of network corruption.

It may be helpful to monitor the packets using something like RawCap (see
http://stackoverflow.com/q/1566234/162228).

Also, are you at all able to reproduce this behavior on separate hardware?


 
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WennY  
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 More options Oct 13 2012, 2:21 am
From: WennY <anty...@mail.ru>
Date: Fri, 12 Oct 2012 23:21:34 -0700 (PDT)
Local: Sat, Oct 13 2012 2:21 am
Subject: Re: MongoCursorException with message: couldn't send query
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I've installed your sniffer. What doing? What to look for? Thx


 
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Jeremy Mikola  
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 More options Oct 15 2012, 11:35 am
From: Jeremy Mikola <jmik...@gmail.com>
Date: Mon, 15 Oct 2012 08:35:31 -0700 (PDT)
Local: Mon, Oct 15 2012 11:35 am
Subject: Re: MongoCursorException with message: couldn't send query
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Once you capture the network traffic, you should be able to visualize it in
Wireshark, which as special support for Mongo's wire protocol:
http://wiki.wireshark.org/Mongo

I don't have any more specific advice for you, but the sniffer and
Wireshark should be suitable for determining if the network traffic is
corrupted.

I would strongly encourage you to also attempt reproduction on another
machine.


 
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