Mailing-List: contact user-help@zookeeper.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@zookeeper.apache.org
Received-SPF: pass (nike.apache.org: local policy)
DomainKey-Signature: a=rsa-sha1; c=nofws; d=darose.net; h=message-id:date
	:from:mime-version:to:subject:references:in-reply-to
	:content-type:content-transfer-encoding; q=dns; s=darose.net; b=
	mCxG37PX1ii+RQDhGtntLOYQsrVWnBONU3yEAaUqb2TBEewXII0taEQTxhCT5UGK
	M6WfAQ5Wcivhpaxv4R+ZBPq2C7hG8tPekOIYWiuZ8gJA9T8orRPMtnABQQcacnsp
	oX+dCnD6My531YLM9693beZezhhwNCMGEIEgYQ9AUDo=
Message-ID: <4D7671E1.6070104@darose.net>
Date: Tue, 08 Mar 2011 13:13:53 -0500
From: David Rosenstrauch <darose@darose.net>
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
 rv:1.9.2.15) Gecko/20110304 Lanikai/3.1.9
MIME-Version: 1.0
To: user@zookeeper.apache.org
Subject: Re: Zookeeper for generating sequential IDs
References: <AANLkTi=Of77TdUpQQmjbNUzquejFe=zPzENcjwfK885b@mail.gmail.com>
 <4D7670D5.4050301@darose.net>
In-Reply-To: <4D7670D5.4050301@darose.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

On 03/08/2011 01:09 PM, David Rosenstrauch wrote:
> On 02/25/2011 04:50 AM, Ertio Lew wrote:
>> Hi all,
>>
>> I am involved in a project where we're building a social application
>> using Cassandra DB and Java. I am looking for a solution to generate
>> unique sequential IDs for the content on the application. I have been
>> suggested by some people to have a look to Zookeeper for this. I
>> would highly appreciate if anyone can suggest if zookeeper is suitable
>> for this purpose and any good resources to gain information about
>> zookeeper.
>>
>> Since the application is based on a eventually consistent distributed
>> platform using Cassandra, we have felt a need to look over to other
>> solutions instead of building our own using our DB.
>>
>> Any kind of comments, suggestions are highly welcomed! :)
>>
>> Regards
>> Ertio Lew.
>
> I ran into a similar id-generation issue, and wrote a library for it.
> (Details described in this msg:
> http://mail-archives.apache.org/mod_mbox/hadoop-zookeeper-user/201008.mbox/%3C4C5B7656.4020200@darose.net%3E
> .)
>
> Been planning to release it to the community, but haven't gotten around
> to it yet.
>
> Not sure my solution is exactly what you're looking for though.
>
> HTH,
>
> DR

BTW, that email is old.  We now have had this running quite reliably in 
production for several months now.  It's being used by M/R jobs running 
100 simultaneous reducers, each accessing the ID generator, and 
assigning nearly 1 million ID's per job in total.

DR