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Date: Fri, 8 Apr 2011 07:28:11 +1000
From: Dan Washusen <dan@reactive.org>
To: user@cassandra.apache.org
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Subject: Re: RE: batch_mutate failed: out of sequence response
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Pelops uses a single connection per operation from a pool that is backed by Apache Commons Pool (assuming you're using Cassandra 0.7). I'm not saying it's perfect but it's NOT sharing a connection over multiple threads.

Dan Hendry mentioned that he sees these errors. Is he also using Pelops? From his comment about retrying I'd assume not...

-- 
Dan Washusen
On Thursday, 7 April 2011 at 7:39 PM, Héctor Izquierdo Seliva wrote: 
> El mié, 06-04-2011 a las 21:04 -0500, Jonathan Ellis escribió:
> > "out of sequence response" is thrift's way of saying "I got a response
> > for request Y when I expected request X."
> > 
> > my money is on using a single connection from multiple threads. don't do that.
> 
> I'm not using thrift directly, and my application is single thread, so I
> guess this is Pelops fault somehow. Since I managed to tame memory
> comsuption the problem has not appeared again, but it always happened
> during a stop-the-world GC. Could it be that the message was sent
> instead of being dropped by the server when the client assumed it had
> timed out?
> 

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<div>
            <div>
                <span>Pelops uses a single connection per operation from =
a pool that is backed by Apache Commons Pool (assuming you're using Cassa=
ndra 0.7). &nbsp;I'm not saying it's perfect but it's NOT sharing a conne=
ction over multiple threads.</span></div><div><span><br></span></div><div=
><span>Dan Hendry mentioned that he sees these errors. &nbsp;Is he also u=
sing Pelops=3F &nbsp;=46rom his comment about retrying I'd assume not...<=
br>
                </span>
                <span><br>--&nbsp;<br>Dan Washusen<br><div></div></span>
               =20
                <=21-- <p style=3D=22color: =23a0a0a0;=22>On Thursday, 7 =
April 2011 at 7:39 PM, H=C3=A9ctor Izquierdo Seliva wrote:</p> -->
                <p style=3D=22color: =23a0a0a0;=22>On Thursday, 7 April 2=
011 at 7:39 PM, H=C3=A9ctor Izquierdo Seliva wrote:</p>
                <blockquote type=3D=22cite=22 style=3D=22border-left-styl=
e:solid;border-width:1px;margin-left:0px;padding-left:10px;=22>
                    <span><div><div>El mi=C3=A9, 06-04-2011 a las 21:04 -=
0500, Jonathan Ellis escribi=C3=B3:<br><blockquote type=3D=22cite=22><div=
>=22out of sequence response=22 is thrift's way of saying =22I got a resp=
onse<br>for request Y when I expected request X.=22<br><br>my money is on=
 using a single connection from multiple threads.  don't do that.<br></di=
v></blockquote><br>I'm not using thrift directly, and my application is s=
ingle thread, so I<br>guess this is Pelops fault somehow. Since I managed=
 to tame memory<br>comsuption the problem has not appeared again, but it =
always happened<br>during a stop-the-world GC. Could it be that the messa=
ge was sent<br>instead of being dropped by the server when the client ass=
umed it had<br>timed out=3F<br></div></div></span>
               =20
               =20
               =20
               =20
                </blockquote>
               =20
                <div>
                    <br>
                </div>
            </div>
        </div>
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