Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/731#discussion_r27090207
--- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala
---
@@ -513,89 +513,122 @@ private[spark] class Master(
}
/**
- * Can an app use the given worker? True if the worker has enough memory
and we haven't already
- * launched an executor for the app on it (right now the standalone
backend doesn't like having
- * two executors on the same worker).
+ * Can an app use the given worker?
*/
- def canUse(app: ApplicationInfo, worker: WorkerInfo): Boolean = {
- worker.memoryFree >= app.desc.memoryPerSlave &&
!worker.hasExecutor(app)
+ private def canUse(app: ApplicationInfo, worker: WorkerInfo): Boolean = {
+ val enoughResources = worker.memoryFree >=
app.desc.memoryPerExecutorMB && worker.coresFree > 0
+ val allowToExecute = app.desc.maxCorePerExecutor.isDefined ||
!worker.hasExecutor(app)
+ allowToExecute && enoughResources
--- End diff --
I'm not sure if we need `allowToExecute` here. If `maxCorePerExecutor` is
not defined then we will grab all the cores, in which case `worker.coresFree`
will be 0.
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