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From: nileader <nileader@gmail.com>
Date: Mon, 25 Mar 2013 09:27:53 +0800
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 <CAMvtm0fAvM__qgaZsvpDeqmE8ir9OshTkAW2SyvU17ca7HosaQ@mail.gmail.com>
Subject: Re: Confused with zookeeper!!!
To: user@zookeeper.apache.org
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Thanks Chris. And I can tell you some useful links in Chinese.

First, you will need to have a overview for zookeeper: =E3=80=8A=E5=88=86=
=E5=B8=83=E5=BC=8F=E6=9C=8D=E5=8A=A1=E6=A1=86=E6=9E=B6 Zookeeper
-- =E7=AE=A1=E7=90=86=E5=88=86=E5=B8=83=E5=BC=8F=E7=8E=AF=E5=A2=83=E4=B8=AD=
=E7=9A=84=E6=95=B0=E6=8D=AE=E3=80=8B
http://www.ibm.com/developerworks/cn/opensource/os-cn-zookeeper/

Then=EF=BC=8Cyou may have no alternative but to want to do this thing, so
=E3=80=8AZooKeeper=E7=AE=A1=E7=90=86=E5=91=98=E6=8C=87=E5=8D=97=E2=80=94=E2=
=80=94=E9=83=A8=E7=BD=B2=E4=B8=8E=E7=AE=A1=E7=90=86ZooKeeper=E3=80=8Bwill h=
elp you to build you own zookeeper
cluster. http://rdc.taobao.com/team/jm/archives/2318

Next=EF=BC=8Cyou just want to use zookeeper in you program, Now, =E3=80=8AZ=
ooKeeper Java
API =E4=BD=BF=E7=94=A8=E6=A0=B7=E4=BE=8B=E3=80=8Bhttp://nileader.blog.51cto=
.com/1381108/795265

After you can use zookeepr in a simple way, you need to know typical scene
for zookeepr, so, =E3=80=8AZooKeeper=E5=85=B8=E5=9E=8B=E5=BA=94=E7=94=A8=E5=
=9C=BA=E6=99=AF=E4=B8=80=E8=A7=88=E3=80=8B
http://rdc.taobao.com/team/jm/archives/1232


Finally=EF=BC=8Czookeeper home page, it's always useful! http://zookeeper.a=
pache.org


*nileader* ni=E6=8E=8C=E6=AB=83=E7=9A=84=E5=80=8B=E4=BA=BA=E9=83=B5=E7=AE=
=B1
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=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=
=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94
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*
=E6=9C=AC=E9=9B=BB=E9=83=B5(=E5=8C=85=E6=8B=AC=E4=BB=BB=E4=BD=95=E9=99=84=
=E4=BB=B6)=E5=8F=AF=E8=83=BD=E5=90=AB=E6=9C=89=E6=A9=9F=E5=AF=86=E8=B3=87=
=E6=96=99=E4=B8=A6=E5=8F=97=E6=B3=95=E5=BE=8B=E4=BF=9D=E8=AD=B7=EF=BC=8C=E5=
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=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=8C=E8=AB=8B=E6=82=A8=E7=AB=8B=E5=8D=B3=E5=
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=E4=B8=A6=E7=94=A8=E4=BD=9C=E4=BB=BB=E4=BD=95=E5=85=B6=E5=AE=83=E7=94=A8=E9=
=80=94=EF=BC=8C=E6=88=96=E9=80=8F=E9=9C=B2=E6=9C=AC=E9=83=B5=E4=BB=B6=E4=B9=
=8B=E5=85=A7=E5=AE=B9=E3=80=82=E8=AC=9D=E8=AC=9D=E3=80=82
*


2013/3/21 Chris Brinley <Chris.Brinley@morningstar.com>

> As someone recently new to zookeeper myself I can see the confusion. Here
> is what I can suggest and I'm sure others will have far more experienced
> input:
>
> To keep things simple I will skip over some details and features.
>
> Zookeeper is essentially an in memory replicated tree. This means any dat=
a
> you can represent as a tree can be placed in zookeeper and clients can
> register to listen for changes to that tree. Mapping a basic XML document
> to this model is probably easiest to understand.
> Each node in zookeeper can represent a tag in the xml with the same sort
> of hierarchy.
>
> The nodes themselves can have arbitrary data associated with them, though
> off hand I'm not sure what the size and type limitations are.
> But continuing this example the nodes of XML usually have attributes
> associated with them and maybe some content between the open/close tags.
> If you were mapping this onto zookeeper one option would be to put those
> attributes and perhaps even the content between open/close tags as node
> data. You could of course make a sub-node in the tree to represent the
> content between open/close tags.
>
> That's essentially it. Some of the practical challenges will likely cente=
r
> around how your apps currently read config data. These are the areas that
> need to be translated into zookeeper compatible logic. Also where today
> you may start and read config once to fully take advantage of zookeeper
> you'd likely want to react dynamically as state changes in zoookeeper,
> though this can obviously be a latter phase as much difficulty can be
> hidden here. Depending on how you abstract configuration load/read in you=
r
> code today this may or may not represent a big migration challenge.
>
> I'm sure there are many follow on questions but hopefully this gives you
> some context to start with.
> Also if you brand new to zookeeper you might want to checkout Curator
> which can help lower the learning curve by handling some of the
> housekeeping required of the client. This client also implements some
> common usage patterns (few of which you listed in your question).
>
> Regards,
>
> On 3/20/13 2:15 AM, "=E5=90=B4=E9=9D=96" <qhwj2006@126.com> wrote:
>
> >hi, guys=EF=BC=81
> >
> >
> > I am new to zookeeper.  and I 'm quite confused with zookeeper, as i
> >know zookeeper is a  coordination service for distributed applications.
> >In Hbase,Zookeeper keeps all the meta data of the Hbase nodes,so all the
> >node can see the same meta data, this is the coordination service.
> >  but what confused me is how to used zookeeper ? for example If  we hav=
e
> >a distributed system, and we need to unify the configuration files for
> >all nodes=EF=BC=8C how can we use the zookeeper? Just put the configurat=
ion files
> >in zookeeper(znode) and let the distributed nodes read from zookeeper?
> >
> >
> >thank you !
>
>

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