Set the release date for 2.7.4
diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 5fdfb2c..9dc5c0e 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -1,6 +1,6 @@
 Hadoop Change Log
 
-Release 2.7.4 - UNRELEASED
+Release 2.7.4 - 2017-08-04
 
   INCOMPATIBLE CHANGES
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 51a11c1..32d4a97 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -1,6 +1,6 @@
 Hadoop HDFS Change Log
 
-Release 2.7.4 - UNRELEASED
+Release 2.7.4 - 2017-08-04
 
   INCOMPATIBLE CHANGES
 
diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 40e13f1..d64f450 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -1,6 +1,6 @@
 Hadoop MapReduce Change Log
 
-Release 2.7.4 - UNRELEASED
+Release 2.7.4 - 2017-08-04
 
   INCOMPATIBLE CHANGES
 
diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 22349a0..2855fd4 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -1,6 +1,6 @@
 Hadoop YARN Change Log
 
-Release 2.7.4 - UNRELEASED
+Release 2.7.4 - 2017-08-04
 
   INCOMPATIBLE CHANGES