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From Pierre Louis Aublin <pierre-louis.aub...@inria.fr>
Subject Re: use cases for asynchronous API
Date Thu, 09 Feb 2012 18:12:46 GMT

On 02/09/2012 11:22 AM, César Álvarez Núñez wrote:
> Almost all my zk agents use asynchronous api; mainly because all services
> are intrinsically asynchronous.
Can you give me more details about these services? Can I found details 
about them on the web?

> In fact I've wrapped the Zookeeper client to hide synchronous methods; so
> anyone who want to develop new agents should think asynchronously.
> It could be hard at first but one you are used to it, the resulting code is
> cleaner than with sync api, and more easy to understand and maintain by
> other developers.
I also imagine that in some scenarios event-based applications (i.e. 
that rely on the async api) provide better performance than applications 
that use the sync api.

Pierre Louis

> On Thu, Feb 9, 2012 at 10:32 AM, Pierre Louis Aublin<
> pierre-louis.aublin@inria.fr>  wrote:
>> Thank you for your replies.
>> On 02/09/2012 12:46 AM, Benjamin Reed wrote:
>>> the yahoo services mention use asynchronous operations a lot. during
>>> startup and reconfig they would have to modify a bunch of znodes. by
>>> shooting off the modifications asynchronously, they were able to
>>> drastically reduce the startup and reconfig time.
>>> ben
>> On 02/09/2012 12:48 AM, Jordan Zimmerman wrote:
>>> Some of the Curator recipes use async. For instance, adding a entry into
>>> the DistributedQueue is done in the background as there's no reason for
>>> the foreground process to wait for this.
>>> -JZ
>>> On 2/8/12 2:09 PM, "Pierre Louis Aublin"<pierre-louis.aublin@**inria.fr<pierre-louis.aublin@inria.fr>
>>> wrote:
>>   On Wed, Feb 8, 2012 at 2:09 PM, Pierre Louis Aublin
>>> <pierre-louis.aublin@inria.fr>   wrote:
>>>> Hello everybody
>>>> I would like to know if the asynchronous operations of the client API are
>>>> often used in applications that use Zookeeper.
>>>> In [1] I found 3 applications built on Zookeeper (the Yahoo! Fetching
>>>> Service, Katta and the Yahoo! Message Broker). However, I do not find if
>>>> they use the synchronous or asynchronous operations.
>>>> The big question I am trying to answer is : is it relevant to consider a
>>>> closed-loop model in order to benchmark replicated services (Zookeeper
>>>> being
>>>> a good candidate to build replicated services)? Can you give me any clue
>>>> on
>>>> that?
>>>> Thanks in advance
>>>> Pierre Louis Aublin
>>>> [1] ZooKeeper: Wait-free Coordination for Internet-scale Systems, Patrick
>>>> Hunt and Mahadev Konar, /Yahoo! Grid;/ Flavio P. Junqueira and Benjamin
>>>> Reed, /Yahoo! Research/

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