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https://issues.apache.org/jira/browse/SPARK-15917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15341312#comment-15341312
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Jonathan Taws commented on SPARK-15917:
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No it doesn't for me, I can see it properly set in the Environment tab in the
application details UI, but still it spawns as many executors as it can based
on the cores and memory available. {{spark.executor.instances}} seems to be the
equivalent of {{--num-executors}} in Spark Config (and therefore a YARN-only
option).
> Define the number of executors in standalone mode with an easy-to-use property
> ------------------------------------------------------------------------------
>
> Key: SPARK-15917
> URL: https://issues.apache.org/jira/browse/SPARK-15917
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core, Spark Shell, Spark Submit
> Affects Versions: 1.6.1
> Reporter: Jonathan Taws
> Priority: Minor
>
> After stumbling across a few StackOverflow posts around the issue of using a
> fixed number of executors in standalone mode (non-YARN), I was wondering if
> we could not add an easier way to set this parameter than having to resort to
> some calculations based on the number of cores and the memory you have
> available on your worker.
> For example, let's say I have 8 cores and 30GB of memory available :
> - If no option is passed, one executor will be spawned with 8 cores and 1GB
> of memory allocated.
> - However, if I want to have only *2* executors, and to use 2 cores and 10GB
> of memory per executor, I will end up with *3* executors (as the available
> memory will limit the number of executors) instead of the 2 I was hoping for.
> Sure, I can set {{spark.cores.max}} as a workaround to get exactly what I
> want, but would it not be easier to add a {{--num-executors}}-like option to
> standalone mode to be able to really fine-tune the configuration ? This
> option is already available in YARN mode.
> From my understanding, I don't see any other option lying around that can
> help achieve this.
> This seems to be slightly disturbing for newcomers, and standalone mode is
> probably the first thing anyone will use to just try out Spark or test some
> configuration.
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