Github user susanxhuynh commented on a diff in the pull request:
https://github.com/apache/spark/pull/19543#discussion_r150419093
--- Diff:
resource-managers/mesos/src/main/scala/org/apache/spark/deploy/mesos/config.scala
---
@@ -122,4 +122,11 @@ package object config {
"Example: key1:val1,key2:val2")
.stringConf
.createOptional
+
+ private[spark] val DRIVER_CONSTRAINTS =
+ ConfigBuilder("spark.mesos.driver.constraints")
+ .doc("Attribute based constraints on mesos resource offers. Applied
by the dispatcher " +
+ "when launching drivers. Default is to accept all offers with
sufficient resources.")
+ .stringConf
+ .createWithDefault("")
--- End diff --
@felixcheung I think it's okay. There's a utility function,
`parseConstraintString`, which parses the input string into a Map. If the
string is empty, it returns an empty Map:
https://github.com/apache/spark/blob/fc45c2c88a838b8f46659ebad2a8f3a9923bc95f/resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerUtils.scala#L321
This is also consistent with how the executor constraint string is parsed.
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