GitHub user eatoncys opened a pull request:
https://github.com/apache/spark/pull/18322
[SPARK-21115][Core]If the cores left is less than the coresPerExecutor,the
cores left will not be allocated, so it should not to check in every schedule
## What changes were proposed in this pull request?
If we start an app with the param --total-executor-cores=4 and
spark.executor.cores=3, the cores left is always 1, so it will try to allocate
executors in the function
org.apache.spark.deploy.master.startExecutorsOnWorkers in every schedule.
Another question is, is it will be better to allocate another executor with
1 core for the cores left.
## How was this patch tested?
unit test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/eatoncys/spark leftcores
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18322.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 #18322
----
commit 5f5f01fb55ec827d0053de2b574929520ff73406
Author: 10129659 <chen.yans...@zte.com.cn>
Date: 2017-06-16T05:46:47Z
If the cores left is less than the coresPerExecutor,the cores left will not
be allocated, so it should not to check in every schedule
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