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From David Rosenstrauch <dar...@darose.net>
Subject Re: Zookeeper for generating sequential IDs
Date Tue, 08 Mar 2011 18:13:53 GMT
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.


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