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From: "B. Heath Robinson" <heath@midnighthour.org>
Date: Tue, 28 Apr 2015 16:39:53 +0000
Message-ID: 
 <CAOT+osrvFR8-EVUHFEYF2uQNTuauin6YG4DCJeqLj9acHQsA-w@mail.gmail.com>
Subject: Re: List Watches of a node
To: user@zookeeper.apache.org
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Thanks.  I ran into these, but they don't seem to working as I expected.
For example:

hrobinson@fortress:~$ echo mntr |nc 10.1.0.172 2181
zk_version 3.4.6-1569965, built on 02/20/2014 09:09 GMT
zk_avg_latency 0
zk_max_latency 441
zk_min_latency 0
zk_packets_received 28675194
zk_packets_sent 28674836
zk_num_alive_connections 153
zk_outstanding_requests 0
zk_server_state follower
zk_znode_count 1580
zk_watch_count 147
zk_ephemerals_count 129
zk_approximate_data_size 274629
zk_open_file_descriptor_count 183
zk_max_file_descriptor_count 4096
hrobinson@fortress:~$ echo wchp|nc 10.1.0.172 2181

hrobinson@fortress:~$

My cluster does have 7 members, and the way I read the docs for wchp, it
only returns watches on that server, so I did the same wchp for all 7
members, and I get nothing.


On Tue, Apr 28, 2015 at 11:17 AM Chris Nauroth <cnauroth@hortonworks.com>
wrote:

> One thing to keep in mind is that the wchs, wchp and wchc commands
> currently return information only about data change watches (Watcher
> instances passed to ZooKeeper#exists or ZooKeeper#getData).  These
> commands will not return information about child watches (Watcher
> instances passed to ZooKeeper#getChildren).  ZOOKEEPER-1274 is an open
> issue tracking enhancements to these commands to support returning
> information about child watches too.
>
> https://issues.apache.org/jira/browse/ZOOKEEPER-1274
>
>
> --Chris Nauroth
>
>
>
>
> On 4/28/15, 8:23 AM, "S=C3=A9kine Coulibaly" <scoulibaly@gmail.com> wrote=
:
>
> >The four letters command can be of some help here :
> >
> >echo "wchp" | nc localhost 2181
> >
> >Do you need access from a Java or C API ?
> >
> >Reference:
> >
> http://zookeeper.apache.org/doc/trunk/zookeeperAdmin.html#The+Four+Letter=
+
> >Words
> >
> >
> >2015-04-28 16:45 GMT+02:00 B. Heath Robinson <heath@midnighthour.org>:
> >
> >> I have a system where a client watches ephemeral nodes.  I would like
> >>to be
> >> able to know if there are any watches for a node.  Is there any way to
> >>do
> >> this?
> >>
>
>

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