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From Ji Yan <ji...@drive.ai>
Subject Re: Spark job only starts tasks on a single node
Date Wed, 06 Dec 2017 19:21:34 GMT
I am sure that the other agents have plentiful enough resources, but I
don't know why Spark only scheduled executors on one single node, up to
that node's capacity ( it is a different node everytime I run btw ).

I checked the DEBUG log from Spark Driver, didn't see any mention of
decline. But from log, it looks like it has only accepted one offer from
Mesos.

Also looks like there is no special role required on Spark part!

On Wed, Dec 6, 2017 at 5:57 AM, Art Rand <art.rand@gmail.com> wrote:

> Hello Ji,
>
> Spark will launch Executors round-robin on offers, so when the resources
> on an agent get broken into multiple resource offers it's possible that
> many Executrors get placed on a single agent. However, from your
> description, it's not clear why your other agents do not get Executors
> scheduled on them. It's possible that the offers from your other agents are
> insufficient in some way. The Mesos MASTER log should show offers being
> declined by your Spark Driver, do you see that?  If you have DEBUG level
> logging in your Spark driver you should also see offers being declined
> <https://github.com/apache/spark/blob/193555f79cc73873613674a09a7c371688b6dbc7/resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerUtils.scala#L576>
> there. Finally if your Spark framework isn't receiving any resource offers,
> it could be because of the roles you have established on your agents or
> quota set on other frameworks, have you set up any of that? Hope this helps!
>
> Art
>
> On Tue, Dec 5, 2017 at 10:45 PM, Ji Yan <jiyan@drive.ai> wrote:
>
>> Hi all,
>>
>> I am running Spark 2.0 on Mesos 1.1. I was trying to split up my job onto
>> several nodes. I try to set the number of executors by the formula
>> (spark.cores.max / spark.executor.cores). The behavior I saw was that Spark
>> will try to fill up on one mesos node as many executors as it can, then it
>> stops going to other mesos nodes despite that it has not done scheduling
>> all the executors I have asked it to yet! This is super weird!
>>
>> Did anyone notice this behavior before? Any help appreciated!
>>
>> Ji
>>
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>
>

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