SPARK-1316. Remove use of Commons IO

(This follows from a side point on SPARK-1133, in discussion of the PR: https://github.com/apache/spark/pull/164 )

Commons IO is barely used in the project, and can easily be replaced with equivalent calls to Guava or the existing Spark `Utils.scala` class.

Removing a dependency feels good, and this one in particular can get a little problematic since Hadoop uses it too.

Author: Sean Owen <sowen@cloudera.com>

Closes #226 from srowen/SPARK-1316 and squashes the following commits:

21efef3 [Sean Owen] Remove use of Commons IO

10 files changed, 34 insertions, 54 deletions

diff --git a/core/pom.xml b/core/pom.xml
index a6f478b09b..eb6cc4d310 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -201,11 +201,6 @@
       <scope>test</scope>
     </dependency>
     <dependency>
-      <groupId>commons-io</groupId>
-      <artifactId>commons-io</artifactId>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
       <groupId>org.scalatest</groupId>
       <artifactId>scalatest_${scala.binary.version}</artifactId>
       <scope>test</scope>
diff --git a/core/src/main/scala/org/apache/spark/util/Utils.scala b/core/src/main/scala/org/apache/spark/util/Utils.scala
index 13d9dbdd9a..ad87fda140 100644
--- a/core/src/main/scala/org/apache/spark/util/Utils.scala
+++ b/core/src/main/scala/org/apache/spark/util/Utils.scala
@@ -529,7 +529,10 @@ private[spark] object Utils extends Logging {
       }
     }
     if (!file.delete()) {
-      throw new IOException("Failed to delete: " + file)
+      // Delete can also fail if the file simply did not exist
+      if (file.exists()) {
+        throw new IOException("Failed to delete: " + file.getAbsolutePath)
+      }
     }
   }
 
diff --git a/core/src/test/scala/org/apache/spark/util/UtilsSuite.scala b/core/src/test/scala/org/apache/spark/util/UtilsSuite.scala
index 8f55b2372c..eb8f591560 100644
--- a/core/src/test/scala/org/apache/spark/util/UtilsSuite.scala
+++ b/core/src/test/scala/org/apache/spark/util/UtilsSuite.scala
@@ -24,7 +24,6 @@ import java.nio.{ByteBuffer, ByteOrder}
 
 import com.google.common.base.Charsets
 import com.google.common.io.Files
-import org.apache.commons.io.FileUtils
 import org.scalatest.FunSuite
 
 class UtilsSuite extends FunSuite {
@@ -136,7 +135,7 @@ class UtilsSuite extends FunSuite {
     // Read some nonexistent bytes on both ends
     assert(Utils.offsetBytes(f1Path, -3, 25) === "1\n2\n3\n4\n5\n6\n7\n8\n9\n")
 
-    FileUtils.deleteDirectory(tmpDir2)
+    Utils.deleteRecursively(tmpDir2)
   }
 
   test("deserialize long value") {
diff --git a/pom.xml b/pom.xml
index fa72d5f263..deb89b18ad 100644
--- a/pom.xml
+++ b/pom.xml
@@ -436,11 +436,6 @@
         <scope>test</scope>
       </dependency>
       <dependency>
-        <groupId>commons-io</groupId>
-        <artifactId>commons-io</artifactId>
-        <version>2.4</version>
-      </dependency>
-      <dependency>
         <groupId>org.easymock</groupId>
         <artifactId>easymock</artifactId>
         <version>3.1</version>
diff --git a/project/SparkBuild.scala b/project/SparkBuild.scala
index 21d2779d85..60f14ba37e 100644
--- a/project/SparkBuild.scala
+++ b/project/SparkBuild.scala
@@ -259,8 +259,7 @@ object SparkBuild extends Build {
         "org.scalacheck"   %% "scalacheck"      % "1.10.0" % "test",
         "com.novocode"      % "junit-interface" % "0.10"   % "test",
         "org.easymock"      % "easymock"        % "3.1"    % "test",
-        "org.mockito"       % "mockito-all"     % "1.8.5"  % "test",
-        "commons-io"        % "commons-io"      % "2.4"    % "test"
+        "org.mockito"       % "mockito-all"     % "1.8.5"  % "test"
     ),
 
     testOptions += Tests.Argument(TestFrameworks.JUnit, "-v", "-a"),
@@ -439,10 +438,7 @@ object SparkBuild extends Build {
 
   def streamingSettings = sharedSettings ++ Seq(
     name := "spark-streaming",
-    previousArtifact := sparkPreviousArtifact("spark-streaming"),
-    libraryDependencies ++= Seq(
-      "commons-io" % "commons-io" % "2.4"
-    )
+    previousArtifact := sparkPreviousArtifact("spark-streaming")
   )
 
   def yarnCommonSettings = sharedSettings ++ Seq(
diff --git a/streaming/pom.xml b/streaming/pom.xml
index 2cb8bde664..1953cc6883 100644
--- a/streaming/pom.xml
+++ b/streaming/pom.xml
@@ -74,10 +74,6 @@
       <artifactId>junit-interface</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>commons-io</groupId>
-      <artifactId>commons-io</artifactId>
-    </dependency>
   </dependencies>
   <build>
     <outputDirectory>target/scala-${scala.binary.version}/classes</outputDirectory>
diff --git a/streaming/src/main/scala/org/apache/spark/streaming/util/MasterFailureTest.scala b/streaming/src/main/scala/org/apache/spark/streaming/util/MasterFailureTest.scala
index 2bb616cfb8..c48a38590e 100644
--- a/streaming/src/main/scala/org/apache/spark/streaming/util/MasterFailureTest.scala
+++ b/streaming/src/main/scala/org/apache/spark/streaming/util/MasterFailureTest.scala
@@ -28,12 +28,12 @@ import scala.collection.mutable.{SynchronizedBuffer, ArrayBuffer}
 import scala.reflect.ClassTag
 
 import java.io.{File, ObjectInputStream, IOException}
+import java.nio.charset.Charset
 import java.util.UUID
 
 import com.google.common.io.Files
 
-import org.apache.commons.io.FileUtils
-import org.apache.hadoop.fs.{FileUtil, FileSystem, Path}
+import org.apache.hadoop.fs.Path
 import org.apache.hadoop.conf.Configuration
 
 
@@ -389,7 +389,7 @@ class FileGeneratingThread(input: Seq[String], testDir: Path, interval: Long)
         val localFile = new File(localTestDir, (i + 1).toString)
         val hadoopFile = new Path(testDir, (i + 1).toString)
         val tempHadoopFile = new Path(testDir, ".tmp_" + (i + 1).toString)
-        FileUtils.writeStringToFile(localFile, input(i).toString + "\n")
+        Files.write(input(i) + "\n", localFile, Charset.forName("UTF-8"))
         var tries = 0
         var done = false
             while (!done && tries < maxTries) {
diff --git a/streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala b/streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala
index 831e7c1471..0784e562ac 100644
--- a/streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala
+++ b/streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala
@@ -18,10 +18,10 @@
 package org.apache.spark.streaming
 
 import java.io.File
+import java.nio.charset.Charset
 
 import scala.collection.mutable.ArrayBuffer
 import scala.reflect.ClassTag
-import org.apache.commons.io.FileUtils
 import com.google.common.io.Files
 import org.apache.hadoop.fs.{Path, FileSystem}
 import org.apache.hadoop.conf.Configuration
@@ -29,7 +29,6 @@ import org.apache.spark.streaming.StreamingContext._
 import org.apache.spark.streaming.dstream.{DStream, FileInputDStream}
 import org.apache.spark.streaming.util.ManualClock
 import org.apache.spark.util.Utils
-import org.apache.spark.SparkConf
 
 /**
  * This test suites tests the checkpointing functionality of DStreams -
@@ -46,13 +45,13 @@ class CheckpointSuite extends TestSuiteBase {
 
   override def beforeFunction() {
     super.beforeFunction()
-    FileUtils.deleteDirectory(new File(checkpointDir))
+    Utils.deleteRecursively(new File(checkpointDir))
   }
 
   override def afterFunction() {
     super.afterFunction()
     if (ssc != null) ssc.stop()
-    FileUtils.deleteDirectory(new File(checkpointDir))
+    Utils.deleteRecursively(new File(checkpointDir))
   }
 
   test("basic rdd checkpoints + dstream graph checkpoint recovery") {
@@ -256,7 +255,7 @@ class CheckpointSuite extends TestSuiteBase {
     //var clock = ssc.scheduler.clock.asInstanceOf[ManualClock]
     Thread.sleep(1000)
     for (i <- Seq(1, 2, 3)) {
-      FileUtils.writeStringToFile(new File(testDir, i.toString), i.toString + "\n")
+      Files.write(i + "\n", new File(testDir, i.toString), Charset.forName("UTF-8"))
       // wait to make sure that the file is written such that it gets shown in the file listings
       Thread.sleep(1000)
     }
@@ -273,7 +272,7 @@ class CheckpointSuite extends TestSuiteBase {
 
     // Create files while the master is down
     for (i <- Seq(4, 5, 6)) {
-      FileUtils.writeStringToFile(new File(testDir, i.toString), i.toString + "\n")
+      Files.write(i + "\n", new File(testDir, i.toString), Charset.forName("UTF-8"))
       Thread.sleep(1000)
     }
 
@@ -289,7 +288,7 @@ class CheckpointSuite extends TestSuiteBase {
     // Restart stream computation
     ssc.start()
     for (i <- Seq(7, 8, 9)) {
-      FileUtils.writeStringToFile(new File(testDir, i.toString), i.toString + "\n")
+      Files.write(i + "\n", new File(testDir, i.toString), Charset.forName("UTF-8"))
       Thread.sleep(1000)
     }
     Thread.sleep(1000)
diff --git a/streaming/src/test/scala/org/apache/spark/streaming/FailureSuite.scala b/streaming/src/test/scala/org/apache/spark/streaming/FailureSuite.scala
index da9b04de1a..92e1b76d28 100644
--- a/streaming/src/test/scala/org/apache/spark/streaming/FailureSuite.scala
+++ b/streaming/src/test/scala/org/apache/spark/streaming/FailureSuite.scala
@@ -19,14 +19,9 @@ package org.apache.spark.streaming
 
 import org.apache.spark.Logging
 import org.apache.spark.streaming.util.MasterFailureTest
-import StreamingContext._
+import org.apache.spark.util.Utils
 
-import org.scalatest.{FunSuite, BeforeAndAfter}
-import com.google.common.io.Files
 import java.io.File
-import org.apache.commons.io.FileUtils
-import collection.mutable.ArrayBuffer
-
 
 /**
  * This testsuite tests master failures at random times while the stream is running using
@@ -43,12 +38,12 @@ class FailureSuite extends TestSuiteBase with Logging {
 
   override def beforeFunction() {
     super.beforeFunction()
-    FileUtils.deleteDirectory(new File(directory))
+    Utils.deleteRecursively(new File(directory))
   }
 
   override def afterFunction() {
     super.afterFunction()
-    FileUtils.deleteDirectory(new File(directory))
+    Utils.deleteRecursively(new File(directory))
   }
 
   test("multiple failures with map") {
diff --git a/streaming/src/test/scala/org/apache/spark/streaming/InputStreamsSuite.scala b/streaming/src/test/scala/org/apache/spark/streaming/InputStreamsSuite.scala
index 95bf40ba75..74e73ebb34 100644
--- a/streaming/src/test/scala/org/apache/spark/streaming/InputStreamsSuite.scala
+++ b/streaming/src/test/scala/org/apache/spark/streaming/InputStreamsSuite.scala
@@ -23,21 +23,23 @@ import akka.actor.IOManager
 import akka.actor.Props
 import akka.util.ByteString
 
-import org.apache.spark.streaming.dstream.{NetworkReceiver}
-import java.net.{InetSocketAddress, SocketException, Socket, ServerSocket}
 import java.io.{File, BufferedWriter, OutputStreamWriter}
+import java.net.{InetSocketAddress, SocketException, ServerSocket}
+import java.nio.charset.Charset
 import java.util.concurrent.{Executors, TimeUnit, ArrayBlockingQueue}
-import collection.mutable.{SynchronizedBuffer, ArrayBuffer}
-import util.ManualClock
+import java.util.concurrent.atomic.AtomicInteger
+
+import scala.collection.mutable.{SynchronizedBuffer, ArrayBuffer}
+
+import com.google.common.io.Files
+import org.scalatest.BeforeAndAfter
+
+import org.apache.spark.Logging
 import org.apache.spark.storage.StorageLevel
+import org.apache.spark.streaming.dstream.NetworkReceiver
 import org.apache.spark.streaming.receivers.Receiver
-import org.apache.spark.Logging
-import scala.util.Random
-import org.apache.commons.io.FileUtils
-import org.scalatest.BeforeAndAfter
-import collection.JavaConversions._
-import com.google.common.io.Files
-import java.util.concurrent.atomic.AtomicInteger
+import org.apache.spark.streaming.util.ManualClock
+import org.apache.spark.util.Utils
 
 class InputStreamsSuite extends TestSuiteBase with BeforeAndAfter {
 
@@ -112,7 +114,7 @@ class InputStreamsSuite extends TestSuiteBase with BeforeAndAfter {
     Thread.sleep(1000)
     for (i <- 0 until input.size) {
       val file = new File(testDir, i.toString)
-      FileUtils.writeStringToFile(file, input(i).toString + "\n")
+      Files.write(input(i) + "\n", file, Charset.forName("UTF-8"))
       logInfo("Created file " + file)
       Thread.sleep(batchDuration.milliseconds)
       Thread.sleep(1000)
@@ -136,7 +138,7 @@ class InputStreamsSuite extends TestSuiteBase with BeforeAndAfter {
     // (whether the elements were received one in each interval is not verified)
     assert(output.toList === expectedOutput.toList)
 
-    FileUtils.deleteDirectory(testDir)
+    Utils.deleteRecursively(testDir)
 
     // Enable manual clock back again for other tests
     conf.set("spark.streaming.clock", "org.apache.spark.streaming.util.ManualClock")