This is the behavior we had when we first implemented the API, and in every case where people used the information there was a bug. it is virtually impossible to use correctly. In general I'm all for giving people rope, but if it always results in death, you should stop handing it out.
In your example, if the ACL changed and then the data changed, we would have a security hole if we sent the data with the watch. ben ________________________________________ From: burtona...@gmail.com [burtona...@gmail.com] On Behalf Of Kevin Burton [bur...@spinn3r.com] Sent: Tuesday, January 06, 2009 4:39 PM To: zookeeper-user@hadoop.apache.org Subject: Sending data during NodeDataChanged or NodeCreated So if I understand this correctly, if I receive a NodeDataChanged event, and then attempt do do a read of that node, there's a race condition where the server could crash and I would be disconnected and my read would hit an Exception Or, the ACL could change and I no longer have permission to read the file (though I did for a short window). ..... now I have to add all this logic to retry. Are there any other race conditions I wonder. Why not just send the byte[] data during the NodeDataChanged or NodeCreated event from the server? This would avoid all these issues. It's almost certainly what the user wants anyway. Kevin -- Founder/CEO Spinn3r.com Location: San Francisco, CA AIM/YIM: sfburtonator Skype: burtonator Work: http://spinn3r.com
