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Zookeeper >> mail # user >> detecting child changes reliably


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Re: detecting child changes reliably
You could check the version of the nodes or cversion of the parent.

On 12/30/2013 02:15 PM, Jun Rao wrote:
> Hi,
>
> When a child watcher is fired, it can happen that when the children are
> read, a deleted node is already added back. So, from the list of children,
> it's as if nothing has changed. However, it could be important for an app
> to know in this case that something has changed. I could include some
> metadata per node and read every child node each. However, reading the data
> for every child could be expensive. What's best way to handle this case?
>
> Thanks,
>
> Jun
>
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB