[GitHub] wonook commented on a change in pull request #28: [NEMO-12] Frontend support for Scala Spark

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wonook commented on a change in pull request #28: [NEMO-12] Frontend support for Scala Spark
URL: https://github.com/apache/incubator-nemo/pull/28#discussion_r193308930
 
 

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 File path: compiler/frontend/spark/src/main/java/edu/snu/nemo/compiler/frontend/spark/core/rdd/PairRDDFunctions.scala
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 @@ -0,0 +1,324 @@
+/*
+ * Copyright (C) 2018 Seoul National University
+ *
+ * Licensed 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 edu.snu.nemo.compiler.frontend.spark.core.rdd
+
+import java.util
+
+import edu.snu.nemo.common.dag.DAGBuilder
+import edu.snu.nemo.common.ir.edge.IREdge
+import edu.snu.nemo.common.ir.edge.executionproperty.KeyExtractorProperty
+import edu.snu.nemo.common.ir.vertex.{IRVertex, LoopVertex, OperatorVertex}
+import edu.snu.nemo.compiler.frontend.spark.SparkKeyExtractor
+import edu.snu.nemo.compiler.frontend.spark.coder.SparkCoder
+import edu.snu.nemo.compiler.frontend.spark.core.SparkFrontendUtils
+import edu.snu.nemo.compiler.frontend.spark.transform.ReduceByKeyTransform
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.io.compress.CompressionCodec
+import org.apache.hadoop.mapred.{JobConf, OutputFormat}
+import org.apache.hadoop.mapreduce.{OutputFormat => NewOutputFormat}
+import org.apache.spark.api.java.function.Function2
+import org.apache.spark.partial.{BoundedDouble, PartialResult}
+import org.apache.spark.{Partitioner, rdd}
+import org.apache.spark.serializer.Serializer
+
+import scala.reflect.ClassTag
+
+/**
+ * Extra functions available on RDDs of (key, value) pairs through an implicit conversion in Nemo.
+ */
+final class PairRDDFunctions[K: ClassTag, V: ClassTag] protected[rdd] (
 
 Review comment:
   Shouldn't this class be under the `main/scala/...` directory instead of `main/java/...` directory?

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