Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/4960#discussion_r27087646
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerUtils.scala
---
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.scheduler.cluster.mesos
+
+import java.util.List
+
+import scala.collection.JavaConversions._
+import scala.collection.mutable.ArrayBuffer
+
+import org.apache.mesos.Protos._
+import org.apache.mesos.{Scheduler, MesosSchedulerDriver}
+import org.apache.spark.{Logging, SparkConf}
+import org.apache.mesos.protobuf.ByteString
+import org.apache.mesos.Protos.Value.Type
+
+
+private[spark] trait MesosSchedulerUtils extends Logging {
+ def createSchedulerDriver(
+ scheduler: Scheduler,
+ sparkUser: String,
+ appName: String,
+ masterUrl: String,
+ conf: SparkConf) = {
+ val fwInfoBuilder =
FrameworkInfo.newBuilder().setUser(sparkUser).setName(appName)
+ var credBuilder: Option[Credential.Builder] = None
+
+ conf.getOption("spark.mesos.principal").foreach { principal =>
+ fwInfoBuilder.setPrincipal(principal)
+ credBuilder = Option(Credential.newBuilder().setPrincipal(principal))
+ }
+
+ conf.getOption("spark.mesos.secret").foreach { secret =>
+ credBuilder = Option(credBuilder.getOrElse(Credential.newBuilder())
+ .setSecret(ByteString.copyFromUtf8(secret)))
+ }
+
+ conf.getOption("spark.mesos.role").foreach { role =>
+ fwInfoBuilder.setRole(role)
+ }
+
+ if (credBuilder.isDefined) {
+ new MesosSchedulerDriver(
+ scheduler, fwInfoBuilder.build, masterUrl, credBuilder.get.build())
+ } else {
+ new MesosSchedulerDriver(scheduler, fwInfoBuilder.build, masterUrl)
+ }
+ }
+
+ // Helper function to pull out a resource from a Mesos Resources protobuf
+ def getResource(res: List[Resource], name: String): Double = {
+ var resource = 0.0
+ // A resource can have multiple values in the offer since it can
either be from
+ // a specific role or wildcard.
+ for (r <- res if r.getName == name) {
+ resource += r.getScalar.getValue
+
+ }
+ resource
+ }
+
+ /**
+ * Partition the existing resource list based on the resources requested
and
+ * the remaining resources.
--- End diff --
This sounds pretty confusing. Really what this is doing is:
```
Partition the existing set of resources into two groups, those remaining to
be scheduled and those currently in use.
```
(I'm assuming that's what "remaining" here means?)
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