Definitely checkout the 4letter words then (wch*). Keep in mind
getting this data may be expensive (if there's alot of it) and that
watches are locak, so servers only know about the watches from
sessions est through it (server 1 doesn't know about watches of
sessions connected on server 2, 3, etc..
thanks Patrick, I want to know all watches set by all clients.
I would open a jira and write some design think about it later.
On Tue, Nov 2, 2010 at 11:53 PM, Patrick Hunt wrote:
> Hi Qian Ye, yes you should open a JIRA for this. If you want to work
> on a patch we could advise you. One thing n
Hi Qian Ye, yes you should open a JIRA for this. If you want to work
on a patch we could advise you. One thing not clear to me, are you
interested in just the watches set by the particular client, or all
watches set by all clients? The first should be relatively easy to
get, the second would be mor
Hi all,
Is there any progress about this issue? Should we open a new JIRA for it? We
really need a way to know who set watchers on a specific node.
thanks~
On Thu, Aug 6, 2009 at 11:01 PM, Qian Ye wrote:
> Thanks Mahadev, I think it is a useful feature for many scenarios.
>
>
> On Thu, Aug 6,
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.
Anot
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 wrote:
> My question is, if the master failed, does that me
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 z
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 wh
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" wrote:
> thx for explaination. Since the watcher can be preserved when the client
> switch the zo
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, 2
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 sessio
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 wrote:
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
http://hadoop.apache.org/zookeeper/docs/
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 alive
Hi all:
Will the watchers of a client be losed when the client disconnects from a
Zookeeper server? It is said at
http://hadoop.apache.org/zookeeper/docs/current/zookeeperProgrammers.html#ch_zkWatchesthat
"
*When a client reconnects, any previously registered watches will be
reregistered and trigg
Thanks Mahadev, I think it is a useful feature for many scenarios.
On Thu, Aug 6, 2009 at 12:59 PM, Mahadev Konar wrote:
> Hi Qian,
> There isnt any such api. We have been thinking abt adding an api on
> cancelling a cleints watches. We have been thinking about adding a proc
> filesystem wherein
Hi Qian,
There isnt any such api. We have been thinking abt adding an api on
cancelling a cleints watches. We have been thinking about adding a proc
filesystem wherein a cleintt will have a list of all the watches. This data
can be used to know which clients are watching what znode, but this has
a
Hi all:
Is there a client API for querying the watchers' owner for a specific znode?
In some situation, we want to find out who set watchers on the znode.
thx
--
With Regards!
Ye, Qian
Made in Zhejiang University
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