17.11.11 18:54, Sean Bridges написав(ла):
Can you do,
Stat stat = zk.setData(somePath, new byte[] {});
stat.getVersion();
setData(...) will update the version number of the node.
Is it guarantied that two calls won't receive same stat? (E.g. some kind
of merging of two setData).
This is how we use zookeeper for sequence number generation.
Sean
On Thu, Nov 17, 2011 at 1:59 AM, Vitalii Tymchyshyn<[email protected]> wrote:
Hello.
I have a feature request I'd like to discuss: How about a call that will
give next sequential node number without node creation. Main reason is that
in many cases this would allow retries without leak on reconnect, e.g.:
Now:
1) create(SEQUENTIAL) - disconnect - retry - and you've just leaked a node
Can be
2) incrementCounter() - create(name). And you can make a retry in any place.
The worst thing that can occur is that you will have a hole in your
numbering
Another cases this can help are simple counters (no need to create nodes at
all) or simply different sequential nodes naming schema.
Best regards, Vitalii Tymchyshyn
