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From Tim Chen <...@mesosphere.io>
Subject Fwd: Controlling number of executors on Mesos vs YARN
Date Tue, 06 Jan 2015 01:07:25 GMT
Forgot to hit reply-all.

---------- Forwarded message ----------
From: Tim Chen <tim@mesosphere.io>
Date: Sun, Jan 4, 2015 at 10:46 PM
Subject: Re: Controlling number of executors on Mesos vs YARN
To: mvle <mvle@us.ibm.com>


Hi Mike,

You're correct there is no such setting in for Mesos coarse grain mode,
since the assumption is that each node is launched with one container and
Spark is launching multiple tasks in that container.

In fine-grain mode there isn't a setting like that, as it currently will
launch an executor as long as it satisfies the minimum container resource
requirement.

I've created a JIRA earlier about capping the number of executors or better
distribute the # of executors launched in each node. Since the decision of
choosing what node to launch containers is all in the Spark scheduler side,
it's very easy to modify it.

Btw, what's the configuration to set the # of executors on YARN side?

Thanks,

Tim



On Sun, Jan 4, 2015 at 9:37 PM, mvle <mvle@us.ibm.com> wrote:

> I'm trying to compare the performance of Spark running on Mesos vs YARN.
> However, I am having problems being able to configure the Spark workload to
> run in a similar way on Mesos and YARN.
>
> When running Spark on YARN, you can specify the number of executors per
> node. So if I have a node with 4 CPUs, I can specify 6 executors on that
> node. When running Spark on Mesos, there doesn't seem to be an equivalent
> way to specify this. In Mesos, you can somewhat force this by specifying
> the
> number of CPU resources to be 6 when running the slave daemon. However,
> this
> seems to be a static configuration of the Mesos cluster rather something
> that can be configured in the Spark framework.
>
> So here is my question:
>
> For Spark on Mesos, am I correct that there is no way to control the number
> of executors per node (assuming an idle cluster)? For Spark on Mesos
> coarse-grained mode, there is a way to specify max_cores but that is still
> not equivalent to specifying the number of executors per node as when Spark
> is run on YARN.
>
> If I am correct, then it seems Spark might be at a disadvantage running on
> Mesos compared to YARN (since it lacks the fine tuning ability provided by
> YARN).
>
> Thanks,
> Mike
>
>
>
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