GitHub user skyluc opened a pull request:
https://github.com/apache/spark/pull/11047
[SPARK-13002][Mesos] Send initial request of executors for dyn allocation
Fix for [SPARK-13002](https://issues.apache.org/jira/browse/SPARK-13002)
about the initial number of executors when running with dynamic allocation on
Mesos.
Instead of fixing it just for the Mesos case, made the change in
`ExecutorAllocationManager`. It is already driving the number of executors
running on Mesos, only no the initial value.
The `None` and `Some(0)` are internal details on the computation of
resources to reserved, in the Mesos backend scheduler. `executorLimitOption`
has to be initialized correctly, otherwise the Mesos backend scheduler will,
either, create to many executors at launch, or not create any executors and not
be able to recover from this state.
Removed the 'special case' description in the doc. It was not totally
accurate, and is not needed anymore.
This doesn't fix the same problem visible with Spark standalone. There is
no straightforward way to send the initial value in standalone mode.
Somebody knowing this part of the yarn support should review this change.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/skyluc/spark issue/initial-dyn-alloc-2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11047.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #11047
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commit 1c7594073267c8e0d4a58d7d4f6bd55df73d0316
Author: Luc Bourlier <luc.bourl...@typesafe.com>
Date: 2016-01-22T14:42:21Z
Send initial request of executors for dyn allocation
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