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From Kah-Chan Low <kahchan...@yahoo.com>
Subject Re: How to monitor changes in children's data
Date Fri, 17 Jan 2014 17:51:28 GMT
Thanks Rakesh & Jordan!
I should have said that I am using C binding so Curator is out.


So basically what I need to do is to set a watcher on each of the children.  I had hope there
was an easier way out...




On Thursday, January 16, 2014 11:49 PM, Rakesh R <rakeshr@huawei.com> wrote:
 

Sorry, seems some format issues in the previous mail. Please see the modified one.

One approach is to iterate over the znode children and add data watcher to it. 
In the below example, I defined one single watcher instance which will handle the events and
based on path it can act upon.

String parentPath = "/myparentnode"; // parent node which holds the children

Watcher w = new Watcher(){
       @Override
       public void process(WatchedEvent watchEvent) {
         //......write logic based on the znode child path
       }
}

// here it would be good to handle the KeeperExceptions 
// according to the business logic

for(String child : children){
   zk.getData(parentpath + "/" + path, w); 
}


-----Original Message-----
From: Rakesh R 
Sent: 17 January 2014 10:16
To: 'user@zookeeper.apache.org'; 'Kah-Chan Low'
Subject: RE: How to monitor changes in children's data


One approach is to iterate over the znode children and add data watcher to it. In the below
example, I defined one single watcher instance which will handle the events and based on path
it can act upon.

for example:

String parentPath = "/myparentnode"; // parent node which holds the children

Watcher w = new Watcher(){
       @Override
       public void process(WatchedEvent watchEvent) {
         //......write logic based on the znode child path
       }
}
// here it would be good to handle the KeeperExceptions // according to the business logic
for(String child : children){
   zk.getData(parentpath + "/" + path, w); }

-Rakesh

-----Original Message-----
From: Kah-Chan Low [mailto:kahchanlow@yahoo.com]
Sent: 16 January 2014 21:14
To: user@zookeeper.apache.org
Subject: How to monitor changes in children's data

I am a novice.
I have a Znode and I want to get notified whenever anyone of the Znode's children has a change
of data.
What kind of watch should I place on the Znode?

Thanks!
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