Here they are

A= aron

On 09 Nov, 2010,at 09:36 AM, Jeremiah Jordan <JE= REMIAH.JORDAN@morningstar.com> wrote:

Is the slide deck for this present= ation online somewhere?
=0A
=0A-----Original Message-----
=0AFrom= : Jonathan Ellis [mailto:jbellis@gmail.com]
=0ASent: Monday, November = 08, 2010 2:02 PM
=0ATo: user
=0ASubject: Re: Design Question
=0A<= br>=0AHi Mubarak,
=0A
=0ADid you see David Strauss's talk on queing = at the Summit?
=0Ahttp://riptano.blip.tv/file= /4015190/
=0A
=0AWhat specifics can you give as to how your use = case is similar to /
=0A
=0A= On Sun, Nov 7, 2010 at 7:05 PM, Mubarak Seyed <mubarak.seyed@gmail.com&= gt; wrote:
=0A> Hi All,
=0A> Can someone please validate and r= ecommend a solution for the given design
=0A> problem?
=0A> Pr= oblem statement: Need to de-queue data from Cassandra (from Standard
=0A= > ColumnFamily) using a job but multiple instances of a job can run
= =0A> simultaneously (kinda multiple threads), trying to access a same r= ow but
=0A> need to make sure that only one instance of a job (threa= d) can access a row,
=0A> meaning if job A is accessing Row #1, then= job B can't access Row #1.
=0A> Possible solutions:
=0A> Solu= tion #1: Using Cages (and ZooKeeper) to make sure that one only job at a=0A> time can access a row in CF. How do we make sure that Cages (tra= nsaction
=0A> coordinator using ZooKeeper) is not a Single Point of = Failure? What is the
=0A> performance impact on write/read on n= odes? There is some blog on distributed
=0A> concurrent queue=0A> at http://www.cloudera.com/blog/2009/05/building-a-dist= ributed-concurrent-queue-with-apache-zookeeper/
=0A> Solution #2= : Using some home-grown approach to store/maintain who is
=0A> acces= sing what, meaning which job is accessing which row.
=0A> Are there = any other solutions to the above problem?
=0A> Can someone please he= lp me on validate the design?
=0A> --
=0A> Thanks,
=0A> = Mubarak Seyed.
=0A>
=0A
=0A
=0A
=0A--
=0AJonathan El= lis
=0AProject Chair, Apache Cassandra
=0Aco-founder of Riptano, the= source for professional Cassandra support
=0Ahttp://riptano.com
=0A
=