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From Phil Burress <philburress...@gmail.com>
Subject Re: Zookeeper a good fit?
Date Mon, 18 Aug 2014 18:11:42 GMT
We have 5 or so background jobs that are all long running (start on system
start up and terminate on system shutdown or node removal). Basically I
just want to ensure that only a single node takes ownership of a particular
job, so that multiple nodes aren't attempting to run the same job.


On Mon, Aug 18, 2014 at 11:52 AM, Jon Bringhurst <
jbringhurst@linkedin.com.invalid> wrote:

> it really depends on the volume of tasks you're dealing with.
>
> If you have a medium volume of background tasks (say, more than one task
> every 5 seconds with high growth potential) it might be a good idea to
> consider something which was designed to perform as a task queue (things
> like http://www.celeryproject.org/, http://gearman.org/, and
> https://github.com/resque/resque fit into this category).
>
> If you have a much higher number of tasks (more than a few per second,
> possibly millions of tasks per second), something like
> https://kafka.apache.org/ (very high volume), or http://www.rabbitmq.com/
> (medium-high volume) might be a good fit for the job.
>
> If you have a very low volume of tasks (a few per minute), you might be
> able to get away with a quick queue implementation directly on top of
> zookeeper. Take a look at the queue recipes at
> https://zookeeper.apache.org/doc/r3.1.2/recipes.html#sc_recipes_Queues
> (also at
> http://blog.cloudera.com/blog/2009/05/building-a-distributed-concurrent-queue-with-apache-zookeeper/).
> It shouldn't be too much effort to whip up something using
> https://kazoo.readthedocs.org/en/latest/.
>
> There's a ton of systems out there to do something like this (I've even
> made one myself https://github.com/hpc/libcircle), so there's a good
> chance I've missed the one that would be perfect for your use case.
> However, the links in this email should give you a decent starting point.
>
> -Jon
>
> On Aug 18, 2014, at 7:41 AM, Phil Burress <philburresseme@gmail.com
> <mailto:philburresseme@gmail.com>> wrote:
>
> Currently we have a cluster of machines running a single application. The
> cluster performs various background tasks and we have a hacky, home-grown
> solution for the nodes in the cluster to coordinate with each other to
> perform these background tasks. It's very error-prone and we're looking to
> replace it. Would Zookeeper be a good fit for coordinating something like
> this? If so, are there any lightweight examples out there we could look at
> it?
>
> Thanks very much!
>
> Phil
>
>

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