Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/5063#discussion_r27149333
--- Diff: docs/running-on-mesos.md ---
@@ -211,6 +211,14 @@ See the [configuration page](configuration.html) for
information on Spark config
</td>
</tr>
<tr>
+ <td><code>spark.mesos.executor.cores</code></td>
+ <td>1.0</td>
+ <td>
+ Set the amount of cores to request for running a mesos executor. This
setting is only used for Mesos fine-grained mode.
+ By default, executor will use the amount of cores even though no task
is running on an executor.
--- End diff --
I would change this to "The setting, which can be a floating point number,
controls the number of cores allocated to the executor not for use by tasks."
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