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Date: Tue, 27 Apr 2010 13:16:07 -0700
Subject: Re: Zookeeper client
From: Mahadev Konar <mahadev@yahoo-inc.com>
To: <zookeeper-user@hadoop.apache.org>
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Hi Avinash,
  No, the randomization only happens on the list of servers that are passed
to the client. If you just pass A to the client, the client will only be
able to connect to A and will not know about the other servers.

Does that help?

Thanks
mahadev

On 4/27/10 11:40 AM, "Avinash Lakshman" <avinash.lakshman@gmail.com> wrote:

> Thanks Mahadev. Does this happen irrespective of what I provide in the
> connect string? Let's say I have servers A, B, C, D and E in the ZK cluster.
> But all my clients instantiate ZooKeeper instances by providing information
> only about A. Does the randomization occur even in this case?
> 
> Thanks
> Avinash
> 
> On Tue, Apr 27, 2010 at 11:00 AM, Mahadev Konar <mahadev@yahoo-inc.com>wrote:
> 
>> HI Avinash,
>>  The zk client does itself maintain liveness information and also
>> randomizes the list of servers to balance the number of clients connected
>> to
>> a single ZooKeeper server.
>> 
>> Hope that helps.
>> 
>> Thanks
>> mahadev
>> 
>> 
>> On 4/27/10 10:56 AM, "Avinash Lakshman" <avinash.lakshman@gmail.com>
>> wrote:
>> 
>>> Let's assume I have 100 clients connecting to a cluster of 5 Zookeeper
>>> servers over time. On the client side I instantiate a ZooKeeper instance
>> and
>>> use it whenever I need to read/write into ZK. Now I know I can pass in a
>>> connect string with the list of all servers that make up the ZK cluster.
>>> Does the ZK client automatically maintain liveness information and load
>>> balance my connections across the machines? How can I do this
>> effectively? I
>>> basically want to spread the connections from the 100 clients to the 5 ZK
>>> instances effectively.
>>> 
>>> Thanks
>>> Avinash
>> 
>>