Mesos is very similar to YARN. It is a resource scheduler. Storm in the past had support for mesos, through a separate repo https://github.com/nathanmarz/storm-mesos it might still work with the latest versions of storm. I don't know. The concept here is that there was a special layer installed that would look for when the cluster had outstanding requests and not enough resources to meet those requests. It would then request that many resources from mesos, launch supervisors on those nodes and let the scheduler do the rest. It works quire well for elasticity at a small scale, or when you have a lot more network bandwidth than you need. The problem is if mesos, or YARN, or open-stack, or EC2, or ... collocates your storm topology with some big batch job that suddenly saturates the network for a few seconds to a min heartbeats could start to time out, traffic would not flow from one worker to another, etc. For some topologies all you do is tune your timeouts so workers don't get shot and relaunched too frequently and live with the noise from other stuff happening on the network. For us though we have some very tight SLAs, if the data is 5 seconds old throw it away I cannot use it any more.
My current goal with storm in this area is to have it be aware of the resources that your topology is using, the SLAs that it has, its desired budget for resources, how far over that budget it is willing to go, Where it could possibly get other resources if needed (i.e. YARN, Mesos, Open Stack), and any other constraints it might have. Storm would then take all of this into account and adjust the scheduling of your topology so that it can grow and shrink with the resources it needs to meet the SLAs it has, optionally taking some of those resources from other systems if needed. This is still a ways out, but looking at the research that is being done in this area it should be doable in the next year or so. - Bobby On Wednesday, May 27, 2015 8:38 AM, Jeffery Maass <maas...@gmail.com> wrote: I have heard Nathan Marz mention Mesos. How is yarn / storm-yarn / slider-yarn different from Mesos? These are the links I found to Mesos: https://github.com/mesos/storm https://github.com/nathanmarz/storm-mesos http://mesos.apache.org/ Thank you for your time! +++++++++++++++++++++ Jeff Maass linkedin.com/in/jeffmaass stackoverflow.com/users/373418/maassql +++++++++++++++++++++ On Wed, May 27, 2015 at 8:28 AM, Bobby Evans <ev...@yahoo-inc.com> wrote: storm-yarn was originally done as a proof of concept. We had plans to take it further, but the amount of work required to make it production ready on a very heavily used cluster was more then we were willing to invest at the time. Most of that work was around network scheduling, isolation and prioritization, mainly in YARN itself. There has been some work looking into this, but nothing much has happened with it. At the same time http://slider.incubator.apache.org/ showed up and is now the preferred way to run Storm on YARN. To get around the networking issues most people will tag a subset of their cluster, a few racks, and only schedule storm to run on those nodes. Long term I really would like to revive storm on yarn, and integrate it directly into storm. Giving storm and the scheduler the ability to request new resources with specific constraints opens up a lot of new possibilities. If you want to help out, or if anyone else wants to help out with this work, I would be very happy to file some JIRA in open source and help direct what needs to be done. - Bobby On Wednesday, May 27, 2015 4:59 AM, Spico Florin <spicoflo...@gmail.com> wrote: Hello!I'm interesting in running the storm topologies on yarn. I was looking at the yahoo project https://github.com/yahoo/storm-yarn, and I could observed that there is no activity since 7 months ago. Also, the issues and requests lists are not updated.Therefore I have some questions:1. Is there any plan to evolve this project?2. Is there any plan to integrate this project in the main branch?3. Is someone using this approach in production ready mode? I look forward for your answers. Regards, Florin
