[SPARK-6178][Shuffle] Removed unused imports

Author: Vinod K C <vinod.kchuawei.com>

Author: Vinod K C <vinod.kc@huawei.com>

Closes #4900 from vinodkc/unused_imports and squashes the following commits:

5373456 [Vinod K C] Removed empty lines
9da7438 [Vinod K C] Changed order of import
594d471 [Vinod K C] Removed unused imports

7 files changed, 2 insertions, 14 deletions

diff --git a/network/common/src/main/java/org/apache/spark/network/TransportContext.java b/network/common/src/main/java/org/apache/spark/network/TransportContext.java
index 5bc6e5a241..f0a89c9d91 100644
--- a/network/common/src/main/java/org/apache/spark/network/TransportContext.java
+++ b/network/common/src/main/java/org/apache/spark/network/TransportContext.java
@@ -35,7 +35,6 @@ import org.apache.spark.network.server.RpcHandler;
 import org.apache.spark.network.server.TransportChannelHandler;
 import org.apache.spark.network.server.TransportRequestHandler;
 import org.apache.spark.network.server.TransportServer;
-import org.apache.spark.network.server.StreamManager;
 import org.apache.spark.network.util.NettyUtils;
 import org.apache.spark.network.util.TransportConf;
 
diff --git a/network/common/src/main/java/org/apache/spark/network/protocol/ChunkFetchFailure.java b/network/common/src/main/java/org/apache/spark/network/protocol/ChunkFetchFailure.java
index 986957c150..f76bb49e87 100644
--- a/network/common/src/main/java/org/apache/spark/network/protocol/ChunkFetchFailure.java
+++ b/network/common/src/main/java/org/apache/spark/network/protocol/ChunkFetchFailure.java
@@ -17,7 +17,6 @@
 
 package org.apache.spark.network.protocol;
 
-import com.google.common.base.Charsets;
 import com.google.common.base.Objects;
 import io.netty.buffer.ByteBuf;
 
diff --git a/network/common/src/main/java/org/apache/spark/network/protocol/Encoders.java b/network/common/src/main/java/org/apache/spark/network/protocol/Encoders.java
index 873c694250..9162d0b977 100644
--- a/network/common/src/main/java/org/apache/spark/network/protocol/Encoders.java
+++ b/network/common/src/main/java/org/apache/spark/network/protocol/Encoders.java
@@ -20,7 +20,6 @@ package org.apache.spark.network.protocol;
 
 import com.google.common.base.Charsets;
 import io.netty.buffer.ByteBuf;
-import io.netty.buffer.Unpooled;
 
 /** Provides a canonical set of Encoders for simple types. */
 public class Encoders {
diff --git a/network/common/src/main/java/org/apache/spark/network/protocol/RpcFailure.java b/network/common/src/main/java/org/apache/spark/network/protocol/RpcFailure.java
index ebd764eb5e..6b991375fc 100644
--- a/network/common/src/main/java/org/apache/spark/network/protocol/RpcFailure.java
+++ b/network/common/src/main/java/org/apache/spark/network/protocol/RpcFailure.java
@@ -17,7 +17,6 @@
 
 package org.apache.spark.network.protocol;
 
-import com.google.common.base.Charsets;
 import com.google.common.base.Objects;
 import io.netty.buffer.ByteBuf;
 
diff --git a/network/common/src/main/java/org/apache/spark/network/server/TransportServer.java b/network/common/src/main/java/org/apache/spark/network/server/TransportServer.java
index ef20999180..b7ce8541e5 100644
--- a/network/common/src/main/java/org/apache/spark/network/server/TransportServer.java
+++ b/network/common/src/main/java/org/apache/spark/network/server/TransportServer.java
@@ -28,7 +28,6 @@ import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelOption;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.socket.SocketChannel;
-import io.netty.util.internal.PlatformDependent;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/network/common/src/main/java/org/apache/spark/network/util/JavaUtils.java b/network/common/src/main/java/org/apache/spark/network/util/JavaUtils.java
index bf8a1fc42f..73da9b7346 100644
--- a/network/common/src/main/java/org/apache/spark/network/util/JavaUtils.java
+++ b/network/common/src/main/java/org/apache/spark/network/util/JavaUtils.java
@@ -17,19 +17,13 @@
 
 package org.apache.spark.network.util;
 
-import java.nio.ByteBuffer;
-
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.File;
 import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
+import java.nio.ByteBuffer;
 
-import com.google.common.base.Preconditions;
-import com.google.common.io.Closeables;
 import com.google.common.base.Charsets;
+import com.google.common.base.Preconditions;
 import io.netty.buffer.Unpooled;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
diff --git a/network/common/src/main/java/org/apache/spark/network/util/NettyUtils.java b/network/common/src/main/java/org/apache/spark/network/util/NettyUtils.java
index 2a4b88b64c..dabd6261d2 100644
--- a/network/common/src/main/java/org/apache/spark/network/util/NettyUtils.java
+++ b/network/common/src/main/java/org/apache/spark/network/util/NettyUtils.java
@@ -25,7 +25,6 @@ import io.netty.buffer.PooledByteBufAllocator;
 import io.netty.channel.Channel;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.ServerChannel;
-import io.netty.channel.epoll.Epoll;
 import io.netty.channel.epoll.EpollEventLoopGroup;
 import io.netty.channel.epoll.EpollServerSocketChannel;
 import io.netty.channel.epoll.EpollSocketChannel;