Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/900#discussion_r14245269
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
---
@@ -46,9 +46,18 @@ class CoarseGrainedSchedulerBackend(scheduler:
TaskSchedulerImpl, actorSystem: A
{
// Use an atomic variable to track total number of cores in the cluster
for simplicity and speed
var totalCoreCount = new AtomicInteger(0)
+ var totalExpectedExecutors = new AtomicInteger(0)
val conf = scheduler.sc.conf
private val timeout = AkkaUtils.askTimeout(conf)
private val akkaFrameSize = AkkaUtils.maxFrameSizeBytes(conf)
+ // Submit tasks only after (registered executors / total expected
executors)
+ // is equal to at least this value.
+ var minRegisteredRatio =
conf.getDouble("spark.scheduler.minRegisteredExecutorsRatio", 0)
--- End diff --
We should add a check for > 1 and set to 1 if over. I initially set it to
40 in a test thinking that meant 40%. I guess the documentation will also
clarify.
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