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From Aaron Turner <synfina...@gmail.com>
Subject Re: hector or astyanax
Date Mon, 06 May 2013 16:57:15 GMT
Just because you can batch queries or have the server process them out of
order doesn't make it fully "parellel".  You're still using a single TCP
connection which is by definition a serial data stream.  Basically, if you
send a bunch of queries which each return a large amount of data you've
effectively limited your query throughput to a single TCP connection.
 Using Thrift, each query result is returned in it's own TCP stream in
*parallel*.

Not saying the new API isn't great, doesn't have it's place or may have
better performance in certain situations, but generally speaking I would
refrain from making general claims without actual benchmarks to back them
up.   I do completely agree that Async interfaces have their place and have
certain advantages over multi-threading models, but it's just another tool
to be used when appropriate.

Just my .02. :)



On Mon, May 6, 2013 at 5:08 AM, Hiller, Dean <Dean.Hiller@nrel.gov> wrote:

> I was under the impression that it is multiple requests using a single
> connectin PARALLEL not serial as they have request ids and the responses do
> as well so you can send a request while a previous request has no response
> just yet.
>
> I think you do get a big speed advantage from the asynchronous nature as
> you do not need to hold up so many threads in your webserver while you have
> outstanding requests being processed.  The thrift async was not exactly
> async like I am suspecting the new java driver is, but have not verified(I
> hope it is)
>
> Dean
>
> From: Aaron Turner <synfinatic@gmail.com<mailto:synfinatic@gmail.com>>
> Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <
> user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
> Date: Sunday, May 5, 2013 5:27 PM
> To: cassandra users <user@cassandra.apache.org<mailto:
> user@cassandra.apache.org>>
> Subject: Re: hector or astyanax
>
>
>
> On Sun, May 5, 2013 at 1:09 PM, Derek Williams <derek@fyrie.net<mailto:
> derek@fyrie.net>> wrote:
> The binary protocol is able to multiplex multiple requests using a single
> connection, which can lead to much better performance (similar to HTTP vs
> SPDY). This is without comparing the performance of thrift vs binary
> protocol, which I assume the binary protocol would be faster since it is
> specialized for cassandra requests.
>
>
> Curious why you think multiplexing multiple requests over a single
> connection (serial) is faster then multiple requests over multiple
> connections (parallel)?
>
> And isn't Thrift a binary protocol?
>
>
> --
> Aaron Turner
> http://synfin.net/         Twitter: @synfinatic
> http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix &
> Windows
> Those who would give up essential Liberty, to purchase a little temporary
> Safety, deserve neither Liberty nor Safety.
>     -- Benjamin Franklin
> "carpe diem quam minimum credula postero"
>



-- 
Aaron Turner
http://synfin.net/         Twitter: @synfinatic
http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix &
Windows
Those who would give up essential Liberty, to purchase a little temporary
Safety, deserve neither Liberty nor Safety.
    -- Benjamin Franklin
"carpe diem quam minimum credula postero"

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