Repository: hadoop
Updated Branches:
  refs/heads/trunk e0c24145d -> 71b8dda4f


HDFS-10326. Disable setting tcp socket send/receive buffers for write 
pipelines. Contributed by Daryn Sharp.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/71b8dda4
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/71b8dda4
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/71b8dda4

Branch: refs/heads/trunk
Commit: 71b8dda4f6ff6006410f3a9fe7717aa096004b1b
Parents: e0c2414
Author: Haohui Mai <whe...@apache.org>
Authored: Tue Aug 8 14:58:11 2017 -0700
Committer: Haohui Mai <whe...@apache.org>
Committed: Tue Aug 8 14:58:16 2017 -0700

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 .../hadoop/hdfs/protocol/HdfsConstants.java     |  4 ++--
 .../src/main/resources/hdfs-default.xml         |  9 ++++++---
 .../hadoop/hdfs/TestDFSClientSocketSize.java    | 20 ++++++++++++--------
 3 files changed, 20 insertions(+), 13 deletions(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/71b8dda4/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/HdfsConstants.java
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diff --git 
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/HdfsConstants.java
 
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/HdfsConstants.java
index b636121..2681f12 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/HdfsConstants.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/HdfsConstants.java
@@ -48,8 +48,8 @@ public final class HdfsConstants {
   public static final byte COLD_STORAGE_POLICY_ID = 2;
   public static final String COLD_STORAGE_POLICY_NAME = "COLD";
 
-  // TODO should be conf injected?
-  public static final int DEFAULT_DATA_SOCKET_SIZE = 128 * 1024;
+  public static final int DEFAULT_DATA_SOCKET_SIZE = 0;
+
   /**
    * A special path component contained in the path for a snapshot file/dir
    */

http://git-wip-us.apache.org/repos/asf/hadoop/blob/71b8dda4/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
index 8bf2b8c..bb62359 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
@@ -2545,13 +2545,14 @@
 
 <property>
   <name>dfs.client.socket.send.buffer.size</name>
-  <value>131072</value>
+  <value>0</value>
   <description>
     Socket send buffer size for a write pipeline in DFSClient side.
     This may affect TCP connection throughput.
     If it is set to zero or negative value,
     no buffer size will be set explicitly,
     thus enable tcp auto-tuning on some system.
+    The default value is 0.
   </description>
 </property>
 
@@ -3025,23 +3026,25 @@
 
 <property>
   <name>dfs.datanode.transfer.socket.send.buffer.size</name>
-  <value>131072</value>
+  <value>0</value>
   <description>
     Socket send buffer size for DataXceiver (mirroring packets to downstream
     in pipeline). This may affect TCP connection throughput.
     If it is set to zero or negative value, no buffer size will be set
     explicitly, thus enable tcp auto-tuning on some system.
+    The default value is 0.
   </description>
 </property>
 
 <property>
   <name>dfs.datanode.transfer.socket.recv.buffer.size</name>
-  <value>131072</value>
+  <value>0</value>
   <description>
     Socket receive buffer size for DataXceiver (receiving packets from client
     during block writing). This may affect TCP connection throughput.
     If it is set to zero or negative value, no buffer size will be set
     explicitly, thus enable tcp auto-tuning on some system.
+    The default value is 0.
   </description>
 </property>
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/71b8dda4/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientSocketSize.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientSocketSize.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientSocketSize.java
index fa12f34..40cd676 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientSocketSize.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientSocketSize.java
@@ -30,7 +30,6 @@ import org.slf4j.LoggerFactory;
 import java.io.IOException;
 import java.net.Socket;
 
-import static 
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_CLIENT_SOCKET_SEND_BUFFER_SIZE_DEFAULT;
 import static 
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_CLIENT_SOCKET_SEND_BUFFER_SIZE_KEY;
 import static org.junit.Assert.assertTrue;
 
@@ -42,15 +41,16 @@ public class TestDFSClientSocketSize {
   }
 
   /**
-   * The setting of socket send buffer size in
-   * {@link java.net.Socket#setSendBufferSize(int)} is only a hint.  Actual
-   * value may differ.  We just sanity check that it is somewhere close.
+   * Test that the send buffer size default value is 0, in which case the 
socket
+   * will use a TCP auto-tuned value.
    */
   @Test
   public void testDefaultSendBufferSize() throws IOException {
-    assertTrue("Send buffer size should be somewhere near default.",
-        getSendBufferSize(new Configuration()) >=
-            DFS_CLIENT_SOCKET_SEND_BUFFER_SIZE_DEFAULT / 2);
+    final int sendBufferSize = getSendBufferSize(new Configuration());
+    LOG.info("If not specified, the auto tuned send buffer size is: {}",
+        sendBufferSize);
+    assertTrue("Send buffer size should be non-negative value which is " +
+        "determined by system (kernel).", sendBufferSize > 0);
   }
 
   /**
@@ -73,6 +73,10 @@ public class TestDFSClientSocketSize {
         sendBufferSize1 > sendBufferSize2);
   }
 
+  /**
+   * Test that if the send buffer size is 0, the socket will use a TCP
+   * auto-tuned value.
+   */
   @Test
   public void testAutoTuningSendBufferSize() throws IOException {
     final Configuration conf = new Configuration();
@@ -80,7 +84,7 @@ public class TestDFSClientSocketSize {
     final int sendBufferSize = getSendBufferSize(conf);
     LOG.info("The auto tuned send buffer size is: {}", sendBufferSize);
     assertTrue("Send buffer size should be non-negative value which is " +
-          "determined by system (kernel).", sendBufferSize > 0);
+        "determined by system (kernel).", sendBufferSize > 0);
   }
 
   private int getSendBufferSize(Configuration conf) throws IOException {


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