All servers keep a copy - so you can shutdown the zk service entirely
(all servers) and restart it and the sessions are maintained.
Patrick
On 08/16/2010 06:34 PM, Qian Ye wrote:
Thx Mahadev and Benjamin, it seems that I've got some misunderstanding about
the client. I will check it out.
There are two different concepts. One is connection loss. Watchers survive
this and the client automatically connects
to another member of the ZK cluster.
The other is session expiration. Watchers do not survive this. This
happens when a client does not provide timely
evidence that it is
zookeeper takes care of reregistering all watchers on reconnect. you
don't need to do anything.
ben
On 08/16/2010 09:04 AM, Qian Ye wrote:
Hi all:
Will the watchers of a client be losed when the client disconnects from a
Zookeeper server? It is said at
I should correct this. The watchers will deliver a session expiration
event, but since the connection is closed at that point no further
events will be delivered and the cluster will remove them. This is as good
as the watchers disappearing.
On Mon, Aug 16, 2010 at 9:20 AM, Ted Dunning
good point ted! i should have waited a bit longer before responding :)
ben
On 08/16/2010 09:20 AM, Ted Dunning wrote:
There are two different concepts. One is connection loss. Watchers survive
this and the client automatically connects
to another member of the ZK cluster.
The other is
thx for explaination. Since the watcher can be preserved when the client
switch the zookeeper server it connects to, does that means all the watchers
information will be saved on all the zookeeper servers? I didn't find any
source of the client can hold the watchers information.
On Tue, Aug 17,
Hi Qian,
The watcher information is saved at the client, and the client will
reattach the watches to the new server it connects to.
Hope that helps.
Thanks
mahadev
On 8/16/10 9:28 AM, Qian Ye yeqian@gmail.com wrote:
thx for explaination. Since the watcher can be preserved when the
the client does keep track of the watches that it has outstanding. when
it reconnects to a new server it tells the server what it is watching
for and the last view of the system that it had.
ben
On 08/16/2010 09:28 AM, Qian Ye wrote:
thx for explaination. Since the watcher can be preserved
Thx Mahadev and Benjamin, it seems that I've got some misunderstanding about
the client. I will check it out.
Another relevant question. I noticed that the master zookeeper server keep a
track of all the client session which connects to every zookeeper server in
the same cluster. So when a slave
Almost never. There was a bug a while back that could have conceivably
caused that under rare circumstances, but I don't know of any current
mechanism for this lossage that you are asking about.
On Mon, Aug 16, 2010 at 6:34 PM, Qian Ye yeqian@gmail.com wrote:
My question is, if the master
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