If client sets a watcher on a znode by doing a getData operation is it
guaranteed to get the next change after the value it read, or can a
change be missed?
In other words if the value it read had zxid z1 and the next update of
the znode has zxid z2, will the watcher always get the event for the
Tom White wrote:
If client sets a watcher on a znode by doing a getData operation is it
guaranteed to get the next change after the value it read, or can a
change be missed?
In other words if the value it read had zxid z1 and the next update of
the znode has zxid z2, will the watcher always
If client sets a watcher on a znode by doing a getData operation is it
guaranteed to get the next change after the value it read, or can a
change be missed?
The watch is just a notification that the node changed. If you do a getData
on the node, you their might have been more updates on the
Thanks for your answers. I understand that you have to call getData()
to find the value of the znode, and that it may have been updated
between the watcher being called and the getData() call. So in that
sense you can miss updates. But watches have strong enough guarantees
to allow you to keep up
The Apache ZooKeeper team is proud to announce Apache ZooKeeper version
3.1.0.
ZooKeeper is a high-performance coordination service for distributed
applications. It exposes common services - such as naming, configuration
management, synchronization, and group services - in a simple interface
