address comment

Author: Davies Liu

core/src/main/scala/org/apache/spark/input/WholeTextFileInputFormat.scala

@@ -19,7 +19,6 @@ package org.apache.spark.input
 
 import scala.collection.JavaConversions._
 
-import org.apache.hadoop.conf.{Configuration, Configurable}
 import org.apache.hadoop.fs.Path
 import org.apache.hadoop.mapreduce.InputSplit
 import org.apache.hadoop.mapreduce.JobContext
@@ -38,18 +37,12 @@ private[spark] class WholeTextFileInputFormat
 
   override protected def isSplitable(context: JobContext, file: Path): Boolean = false
 
-  private var conf: Configuration = _
-  def setConf(c: Configuration) {
-    conf = c
-  }
-  def getConf: Configuration = conf
-
   override def createRecordReader(
       split: InputSplit,
       context: TaskAttemptContext): RecordReader[String, String] = {
 
-    val reader = new WholeCombineFileRecordReader(split, context)
-    reader.setConf(conf)
+    val reader = new ConfigurableCombineFileRecordReader(split, context)
+    reader.setConf(getConf)
     reader
   }
 

core/src/main/scala/org/apache/spark/input/WholeTextFileRecordReader.scala

@@ -17,7 +17,7 @@
 
 package org.apache.spark.input
 
-import org.apache.hadoop.conf.{Configuration, Configurable}
+import org.apache.hadoop.conf.{Configuration, Configurable => HConfigurable}
 import com.google.common.io.{ByteStreams, Closeables}
 
 import org.apache.hadoop.io.Text
@@ -27,6 +27,18 @@ import org.apache.hadoop.mapreduce.lib.input.{CombineFileSplit, CombineFileRecor
 import org.apache.hadoop.mapreduce.RecordReader
 import org.apache.hadoop.mapreduce.TaskAttemptContext
 
+
+/**
+ * A trait to implement [[org.apache.hadoop.conf.Configurable Configurable]] interface.
+ */
+private[spark] trait Configurable extends HConfigurable {
+  private var conf: Configuration = _
+  def setConf(c: Configuration) {
+    conf = c
+  }
+  def getConf: Configuration = conf
+}
+
 /**
  * A [[org.apache.hadoop.mapreduce.RecordReader RecordReader]] for reading a single whole text file
  * out in a key-value pair, where the key is the file path and the value is the entire content of
@@ -38,12 +50,6 @@ private[spark] class WholeTextFileRecordReader(
     index: Integer)
   extends RecordReader[String, String] with Configurable {
 
-  private var conf: Configuration = _
-  def setConf(c: Configuration) {
-    conf = c
-  }
-  def getConf: Configuration = conf
-
   private[this] val path = split.getPath(index)
   private[this] val fs = path.getFileSystem(context.getConfiguration)
 
@@ -90,7 +96,7 @@ private[spark] class WholeTextFileRecordReader(
  * A [[org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader CombineFileRecordReader]]
  * that could pass Hadoop configuration to WholeTextFileRecordReader.
  */
-private[spark] class WholeCombineFileRecordReader(
+private[spark] class ConfigurableCombineFileRecordReader(
     split: InputSplit,
     context: TaskAttemptContext)
   extends CombineFileRecordReader[String, String](
@@ -99,16 +105,10 @@ private[spark] class WholeCombineFileRecordReader(
     classOf[WholeTextFileRecordReader]
   ) with Configurable {
 
-  private var conf: Configuration = _
-  def setConf(c: Configuration) {
-    conf = c
-  }
-  def getConf: Configuration = conf
-
   override def initNextRecordReader(): Boolean = {
     val r = super.initNextRecordReader()
     if (r) {
-      this.curReader.asInstanceOf[WholeTextFileRecordReader].setConf(conf)
+      this.curReader.asInstanceOf[WholeTextFileRecordReader].setConf(getConf)
     }
     r
   }