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From Patrick Hunt <ph...@apache.org>
Subject Re: How to handle ZOO_CONNECTING_STATE and ZOO_ASSOCIATING_STATE?
Date Wed, 02 Feb 2011 17:44:12 GMT
http://zookeeper.apache.org/doc/trunk/zookeeperProgrammers.html#ch_zkSessions

On Wed, Feb 2, 2011 at 9:36 AM, Patrick Hunt <phunt@apache.org> wrote:
> FYI we're almost done converting the legacy hadoop wiki over to the
> new zk tlp cwiki. Any/all pages should be moved over, if not let us
> know, for example the faq:
> https://cwiki.apache.org/confluence/display/ZOOKEEPER/FAQ
>
> I do notice that's missing the attachment as well. Unfortunately
> spammers hit the wiki pages hard, as a result infra@a.o had turned off
> attachments. Not sure the status of cwiki.
>
> Ben, what's the status on this? Is there a way we can update this?
> (iirc isn't that diagram also in the docs? perhaps we could re-attach
> from there?)
>
> Patrick
>
> On Wed, Feb 2, 2011 at 4:52 AM, Ride Shoot Speak
> <ride.shoot.speak@googlemail.com> wrote:
>> Oh, I forgot a point. I can't seem to find a definition of CONNECTION_LOSS
>> in the source code. Where does that come from?
>>
>> regards,
>> Jan
>>
>> 2011/2/2 Ride Shoot Speak <ride.shoot.speak@googlemail.com>
>>
>>> Hi Thijs,
>>>
>>> thanks for the information. A state diagram would help me a lot. Can
>>> someone in charge put it online again or just send it to the list please?
>>>
>>> So ZOO_CONNECTING_STATE is when I issue requests to the ZooKeeper server
>>> between zookeeper_init and  ZOO_CONNECTED_STATE. Did I get it right? My
>>> understanding of the ZOO_CONNECTING_STATE state so far was: The client
>>> ZooKeeper library tries to reconnect to the ZooKeeper und tries to
>>> reestablish a pending session. This then results in ZOO_CONNECTED_STATE
>>> or ZOO_EXPIRED_SESSION_STATE. So I guess I was wrong.
>>>
>>> regards,
>>> Jan
>>>
>>> 2011/2/2 Thijs Terlouw <thijsterlouw@gmail.com>
>>>
>>> On Wed, Feb 2, 2011 at 7:24 PM, Ride Shoot Speak
>>>> <ride.shoot.speak@googlemail.com> wrote:
>>>> > Hi ZooKeepers,
>>>> >
>>>> > I'd like to get some information about the the states
>>>> ZOO_CONNECTING_STATE
>>>> > and ZOO_ASSOCIATING_STATE and how to handle them appropriately. I can't
>>>> seem
>>>> > to find any information about those states. Right now I simply drop
the
>>>> > connection if my callback is called with these states.
>>>> >
>>>> > TIA
>>>> > Jan
>>>>
>>>> Hi Jan,
>>>>
>>>> I would normally refer you to the state diagram of the ZooKeeper
>>>> states, but it seems not to be working (
>>>> http://wiki.apache.org/hadoop/ZooKeeper/FAQ#A1 )
>>>>
>>>> ZOO_CONNECTING_STATE : This is when you try to send a request to the
>>>> ZooKeeper server, when the client library is still actively connecting
>>>> to a server (Session establishment is asynchronous). Requests will be
>>>> queued. If the connection attempt fails, any requests fail with
>>>> CONNECTION_LOSS
>>>>
>>>> ZOO_ASSOCIATING_STATE : I believe the handshake between the client and
>>>> the server is still in progress, also part of the connection process.
>>>>
>>>> I only handle ZOO_EXPIRED_SESSION_STATE (need to explicitly make a new
>>>> zookeeper connection) and ZOO_CONNECTED_STATE (client library is ready
>>>> to be used) explicitly in my client code (I don't use authentication
>>>> so can ignore ZOO_AUTH_FAILED_STATE)
>>>>
>>>> --
>>>> Thijs Terlouw,
>>>> Shenzhen, China
>>>> http://www.startinchina.com
>>>>
>>>
>>>
>>
>

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