There are a couple of changes to ZooKeeper in the works:
First off, there have been some changes we have been holding off to the code
base because they would not be backwards compatible, but now their time has
come. We are starting to work on the 3.0.0 release. Details can be found at
http://zo
Usually, this exception means that the server closed the socket. Are you
seeing anything strange in the server log?
The null pointer exception is coming from the code that parses the hostPort
list. Since you are running in standalone mode your hostPort should be a
string of the form host:port.
It is supported. We run a lot of unit tests that way. Is it possible that the
machine is simply getting overloaded. (Especially with respect to disk
activity?) You have a rather large timeout, so the machine would really need
to be getting swamped.
ben
On Friday 23 May 2008 13:00:02 Juan Ramir
I've updated the wiki page to document these members:
http://zookeeper.wiki.sourceforge.net/ZooKeeperDataModel
>From the wiki:
* czxid - The zxid of the change that caused this znode to be created.
* mzxid - The zxid of the change that last modified this znode.
* ctime - The time i
As of the latest release the same watcher will be called for all events. The
event callback includes the path of the znode that changed, which is how you
can distinguish events.
In the next major release, we will be allowing a watch object to be passed to
the requests to make it easier for prog
No. Internally we use an atomic broadcast protocol (which is what Paxos
would provide us) to keep the replicas in sync, but the protocol is much
simpler than Paxos. We take advantage the fact that we use FIFO channels
(TCP) and always use a leader along with some operational rules which
results in
t the resulting solutions will be different.
ben
- Original Message
From: Evan Jones <[EMAIL PROTECTED]>
To: Benjamin Reed <[EMAIL PROTECTED]>
Cc: zookeeper-user@lists.sourceforge.net
Sent: Friday, June 6, 2008 8:33:29 PM
Subject: Re: [Zookeeper-user] Does ZooKeeper includes
We are starting the process of moving to Apache. We have been approved as a
subproject of Hadoop and are in the process of moving subversion over. We
will also be moving over the documentation and tracker items.
For now, the only thing setup on Apache is Jira, the bug tracking system.
Please re
You can do this. We only done preliminary testing with that configuration. You
may need to increase the tickTime if the pipe between A and B has high
latency and you start seeing timeouts.
There is a bit of a gotcha that you need to keep in mind. Currently clients
select servers at random to co
The client library is in charge of preventing expirations, if it happens it is
probably because of dead servers or network problems that caused a spike in
latency.
Increasing your session timeout helps prevent this.
If/when it happens, you need create another ZooKeeper object to reconnect to
Z
Good point. The recipe we show guarantees there will be a single leader
elected, but only the leader knows it. Jacob Levy has been implementing a
client library to do leader election, so he should really chime in here, but
just in case he doesn't: I believe Jacob's solution was for the leader to
You understand it correctly. The confusion is the result of a bug you
have found. I've filed a bug report with a patch for your problem:
https://issues.apache.org/jira/browse/ZOOKEEPER-48. Since there weren't
any authenticated ids on the channel, when CREATOR_ALL_ACL was used the
ACL was empty. (On
Thanx Shane! You are correct the line below the if block should be moved
up. I've opened issue ZOOKEEPER-49 for it. The fix and test are included
in the ZOOKEEPER-48 patch.
ben
Shane Mingins wrote:
> Hi
>
> Still exploring the ACL stuff in Zookeeper. Tried using setACL for a
> path but get Inv
Martin,
Is there anything that characterizes the failures you are seeing? For
example, is it always after the clients have been running for a while?
Were the clients idle just before the timeout? etc... I would really
like to reproduce this in our lab.
thanx
ben
Martin Schaaf wrote:
> Am 26.06.2
> The session is expired and I try now to catch this state with
> event.getState() == Watcher.Event.KeeperStateExpired. Is there an
> example how to renew the session or do I have to create a new
> ZooKeeper object?
When a session expires the ZooKeeper object becomes invalid. You must create a
ne
This is a great FAQ topic!
There are two kinds of connection problems:
1) Disconnections: this callback says that we have disconnected:
KeeperStateDisconnected. This state is usually due to a server failure or
transient communication error that will hopefully be followed up by a
reconnected ca
The easiest way to fix this code is to move the Collections.sort(values) to
right after the zk.getChildren() and then use the following Comparator with
Collections.sort() and Collections.binarySearch():
/* This Comparator defines an ordering such that the strings with
* the lowest sequence numb
Jacob answered your first question. With respect to your last question,
yes it is save to share ZooKeeper objects. The ZooKeeper object is
thread safe and it is much more efficient for all threads to share the
same object rather than having an object per thread.
ben
Anthony Urso wrote:
> I have a
Writes are processed serially inside of ZooKeeper. Things are pipelined
though, so there can be many writes outstanding.
ben
Avinash Lakshman wrote:
> Hi All
>
> I understand writes to Zookeeper are probably serialized. But suppose
> I have two znodes /A/A1 and /A/A2 can modifications to these zn
Creative idea. This should work. It's kind of a pain. I don't think
there is a Jira opened for this, but you should open one. It's really a
matter of implementation. You should be able to add (or remove) a
machine to ZooKeeper and just have it get integrated in without having
to do any restarting.
Hunt wrote:
> Is there a way to ask the zk cluster to switch leaders? Switch in such a
> way as it doesn't cause a "virtual bounce"? (I mean can we code
> something that would enable this)
>
> Patrick
>
> Benjamin Reed wrote:
> > Creative idea. This shoul
Are you seeing any errors in the ZooKeeper server logs? Looking more
closely that error is happening in a very strange location. I would
think that something should show up in the error log of one of the
servers. Are other clients working? I assume that the client that is
getting the exception is n
What do you mean by "In this the events were thrown endless."?
The event is a notification to the application of the disconnect or
reconnect. The ZooKeeper client library takes care of reestablishing the
connection. The main reason for this event is for the application to
know that the watches hav
Sorry about that and thanx for the patch!
We have moved the development process to Apache. Would you mind opening a Jira
and submitting the patch through the Jira?
thank you
ben
On Wednesday 30 July 2008 02:23:11 Austin Shoemaker wrote:
> We were debugging a crash when using the C client on mul
We have moved development to Apache. With the release of 3.0 of
ZooKeeper on Apache we are shutting down the sourceforge site. If you
are still interested in ZooKeeper (we hope you are :) please subscribe
to the lists at http://hadoop.apache.org/zookeeper.
thank you
ben
---
For those of you going to ApacheCon, I will be doing a presentation of
ZooKeeper on Friday at HadoopCamp.
See http://us.apachecon.com/c/acus2008/schedule/hadoop-camp for more
details.
ben
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