HADOOP-2780. The default socket buffer size on DataNodes is 128K.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/core/trunk@620431 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -45,6 +45,9 @@ Release 0.16.1 - Unrelease
     dfs.umask to set the umask that is used by DFS.
     (Tsz Wo (Nicholas), SZE via dhruba)
 
+    HADOOP-2780. The default socket buffer size for DataNodes is 128K.
+    (dhruba)
+
 Release 0.16.0 - 2008-02-07
 
   INCOMPATIBLE CHANGES

src/java/org/apache/hadoop/dfs/FSConstants.java

@@ -142,7 +142,7 @@ public interface FSConstants {
   public static final int BUFFER_SIZE = new Configuration().getInt("io.file.buffer.size", 4096);
   //TODO mb@media-style.com: should be conf injected?
   public static final long DEFAULT_BLOCK_SIZE = 64 * 1024 * 1024;
-  public static final int DEFAULT_DATA_SOCKET_SIZE = 1024 * 1024;
+  public static final int DEFAULT_DATA_SOCKET_SIZE = 128 * 1024;
 
   public static final int SIZE_OF_INTEGER = Integer.SIZE / Byte.SIZE;