Hi,
Is it possible to read znodes directly from snapshot and log files instead
of usign ZooKeeper API. In case a ZK ensemble is not available, can I login
to all available nodes and run a utility that will dump all znodes?
Thanks.
-Vishal
the state of play there.
>
> On Tue, Oct 12, 2010 at 12:11 PM, Vishal K wrote:
>
> > Hi,
> >
> > What is the best approach to have an idempotent create() operation for a
> > sequential node?
> >
> > Suppose a client is trying to create a sequential node and it
Hi,
What is the best approach to have an idempotent create() operation for a
sequential node?
Suppose a client is trying to create a sequential node and it gets a
ConnectionLoss KeeperException, it cannot know for sure whether the request
succeeded or not. If in the meantime, the client's session
from all servers during the time of the incident? If you could run the
> servers in DEBUG level logging during the time you reproduce the issue that
> would probably help:
> https://issues.apache.org/jira/browse/ZOOKEEPER
>
> Thanks!
>
> Patrick
>
>
> On Wed, Oct 6, 20
riod), in which case the ephemeral znodes _should_
> reappear when A is restarted and successfully rejoins the cluster. (at
> least
> until the session timeout is exceeded)
>
> Patrick
>
> On Tue, Oct 5, 2010 at 11:04 AM, Vishal K wrote:
>
> > Hi,
> >
> > I have a 3
> cluster.
>
> I keep a few around just for backup purposes.
>
> On Wed, Sep 8, 2010 at 12:01 PM, Vishal K wrote:
>
> > Hi All,
> >
> > Can you please share your experience regarding ZK snapshot retention and
> > recovery policies?
> >
> > We ha
Hi All,
Can you please share your experience regarding ZK snapshot retention and
recovery policies?
We have an application where we never need to rollback (i.e., revert back to
a previous state by using old snapshots). Given this, I am trying to
understand under what circumstances would we ever n
ow, wouldn't it be ok for the server to just
send a ping request to see if the client is really dead?
> ben
>
>
> On 08/19/2010 10:17 AM, Vishal K wrote:
>
>> Hi Ted,
>>
>> I haven't give it a serious thought yet, but I don't think it is
>> neccess
not
help.
>
> On Thu, Aug 19, 2010 at 7:51 AM, Vishal K wrote:
>
> > Hi,
> >
> > I remember Ben had opened a jira for clock jumps earlier:
> > https://issues.apache.org/jira/browse/ZOOKEEPER-366. It is not uncommon
> to
> > have clocks jump forward in virtual
Hi,
I remember Ben had opened a jira for clock jumps earlier:
https://issues.apache.org/jira/browse/ZOOKEEPER-366. It is not uncommon to
have clocks jump forward in virtualized environments.
It is desirable to modify ZooKeeper to handle this situation (as much as
possible) internally. It would ne
Hi Qing,
Can you list the znodes from the monitor and from the node that the monitor
is restarting (run zkCli.sh on both machines).
I am curious to see if the node that did not receive the SESSION_EXPIRED
event still has the znode in its database.
Also can you describe your setiup? Can you send ou
In my case, I am pretty sure that the configuration was right. I will
reproduce it and post more info later. Thanks.
On Mon, Aug 16, 2010 at 1:08 PM, Patrick Hunt wrote:
> Try using the logs, stat command or JMX to verify that each ZK server is
> indeed a leader/follower as expected. You should
Hi Dr Hao,
If you think this is not a configuration issue, then it would be a good idea
to open a jira. Thanks.
On Thu, Aug 12, 2010 at 8:42 PM, Ted Dunning wrote:
> On Thu, Aug 12, 2010 at 4:57 PM, Dr Hao He wrote:
>
> > hi, Ted,
> >
> > I am a little bit confused here. So, is the node incon
ination
> layer in the code being coordinated is a bad idea.
>
> On Thu, Aug 12, 2010 at 6:33 AM, Vishal K wrote:
>
> > Hi Ted,
> >
> > Can you explain why running ZK in embedded mode can cause znode
> > inconsistencies?
> > Thanks.
> >
> > -Vish
Hi Ted,
Can you explain why running ZK in embedded mode can cause znode
inconsistencies?
Thanks.
-Vishal
On Thu, Aug 12, 2010 at 12:01 AM, Ted Dunning wrote:
> Try running the server in non-embedded mode.
>
> Also, you are assuming that you know everything about how to configure the
> quorumPe
Hi All,
I am seeing a lot of these messages in our application. I would like to know
if I am doing something wrong or this is a ZK bug.
Setup:
- Server environment:zookeeper.version=3.3.0-925362
- 3 node cluster
- Each node has few clients that connect to the local server using 127.0.0.1
as the h
Hi,
We have embedded ZK server in our application. We start a thread in our
application and call QuorumPeerMain.InitializeArgs().
When cleaning-up ZK we call QuorumPeerMain.shutdown() and wait for the
thread that is calling InitializeArgs() to finish. These two steps are
taking around 60 seconds.
Hi,
We are running into this bug very often (almost 60-75% hit rate) while
testing our newly developed application over ZK. This is almost a blocker
for us. Will the fix be simplified if backward compatibility was not an
issue?
Considering that this bug is rarely reported, I am wondering why we a
Hi All,
Since ZooKeeper does not support secure network connections yet, I thought I
would poll and see what people are doing to address this problem. Is anyone
running ZooKeeper over secure channels (client - server and server- server
authentication/encryption)? If yes, can you please elaborate h
Hi,
Well looks like FastLeaderElection.shutdown() is not invoked. This has been
in 3.3.0. Should have checked on that earlier :-)
On Thu, Apr 29, 2010 at 10:13 AM, Vishal K wrote:
> Hi Ted,
>
> We want the application that embeds the ZK server to be running even after
> the
mon to do a rolling restart on a ZK cluster. Just restart one
> server at a time. This is often used during system upgrades.
>
> On Wed, Apr 28, 2010 at 8:22 PM, Vishal K wrote:
>
> >
> > What is a good way to restart a ZK server (standalone and quorum) without
> &g
how I can
restart without restarting the application? Thanks.
On Sun, Apr 25, 2010 at 2:52 PM, Vishal K wrote:
> Hi Mahadev, Ted,
>
> Thanks for the feedback.
>
>
> On Fri, Apr 23, 2010 at 3:02 PM, Ted Dunning wrote:
>
>> It is, of course, your decision, but a key
Hi Mahadev, Ted,
Thanks for the feedback.
On Fri, Apr 23, 2010 at 3:02 PM, Ted Dunning wrote:
> It is, of course, your decision, but a key coordination function is to
> determine whether your application is up or not. That is very hard to do
> if
> Zookeeper is inside your application.
>
> On
Hi,
Good question. We are planning to do something similar as well and it will
great to know if there are any issues with embedding ZK server into an app.
We simply use QourumPeerMain and QourumPeer from our app to start/stop the
ZK server. Is this not a good way to do it?
On Fri, Apr 23, 2010 at
Hi Hao,
How are you determining whether a ZK server has received the writes or not?
Regards,
-Vishal
On Mon, Apr 19, 2010 at 1:54 AM, Dr Hao He wrote:
> I have zookeeper cluster E1 with 3 nodes A,B, and C.
>
> I stopped C and did some writes on E1. Both A and B received the writes.
> I then
Hi,
It works for me now. Just for the record, I had to copy junit*.jar to
buil/lib because fat.jar expects it to be there. Then, I had to rebuild
fatjar.jar.
On Wed, Apr 7, 2010 at 12:10 AM, Vishal K wrote:
> Hi,
>
> I am trying to run systest on a 3 node cluster (
> http://sv
Hi,
I am trying to run systest on a 3 node cluster (
http://svn.apache.org/repos/asf/hadoop/zookeeper/trunk/src/java/systest/README.txt
).
When I reach the 4th step which is to actually run the test I get exception
shown below.
Exception in thread "main" java.lang.NoClassDefFoundError:
junit/fra
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