diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index b4fbe77e983..8ecca7591a1 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -641,6 +641,8 @@ Release 0.23.0 - Unreleased
 
     HADOOP-7691. Fixed conflict uid for install packages. (Eric Yang)
 
+    HADOOP-7603. Set hdfs, mapred uid, and hadoop uid to fixed numbers. (Eric Yang)
+
 Release 0.22.0 - Unreleased
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/packages/deb/hadoop.control/preinst b/hadoop-hdfs-project/hadoop-hdfs/src/main/packages/deb/hadoop.control/preinst
index 940b7add674..13820227f39 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/packages/deb/hadoop.control/preinst
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/packages/deb/hadoop.control/preinst
@@ -15,4 +15,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-/usr/sbin/useradd --comment "Hadoop HDFS" --shell /bin/bash -M -r --groups hadoop --home /var/lib/hadoop/hdfs hdfs 2> /dev/null || :
+/usr/sbin/useradd --comment "Hadoop HDFS" -u 201 --shell /bin/bash -M -r --groups hadoop --home /var/lib/hadoop/hdfs hdfs 2> /dev/null || :
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/packages/rpm/spec/hadoop-hdfs.spec b/hadoop-hdfs-project/hadoop-hdfs/src/main/packages/rpm/spec/hadoop-hdfs.spec
index d2dcf4f2d89..edc4a3b8aca 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/packages/rpm/spec/hadoop-hdfs.spec
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/packages/rpm/spec/hadoop-hdfs.spec
@@ -144,8 +144,8 @@ mv ${RPM_BUILD_DIR}/%{_final_name}/share/* ${RPM_BUILD_DIR}%{_share_dir}
 rm -rf ${RPM_BUILD_DIR}/%{_final_name}/etc
 
 %pre
-getent group hadoop 2>/dev/null >/dev/null || /usr/sbin/groupadd -r hadoop
-/usr/sbin/useradd --comment "Hadoop HDFS" --shell /bin/bash -M -r --groups hadoop --home %{_var_dir}/hdfs hdfs 2> /dev/null || :
+getent group hadoop 2>/dev/null >/dev/null || /usr/sbin/groupadd -g 123 -r hadoop
+/usr/sbin/useradd --comment "Hadoop HDFS" -u 201 --shell /bin/bash -M -r --groups hadoop --home %{_var_dir}/hdfs hdfs 2> /dev/null || :
 
 %post
 bash ${RPM_INSTALL_PREFIX0}/sbin/update-hdfs-env.sh \
diff --git a/hadoop-mapreduce-project/src/packages/deb/hadoop.control/preinst b/hadoop-mapreduce-project/src/packages/deb/hadoop.control/preinst
index 4cc3cc4f874..229834640c7 100644
--- a/hadoop-mapreduce-project/src/packages/deb/hadoop.control/preinst
+++ b/hadoop-mapreduce-project/src/packages/deb/hadoop.control/preinst
@@ -15,4 +15,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-/usr/sbin/useradd --comment "Hadoop MapReduce" --shell /bin/bash -M -r --groups hadoop --home /var/lib/hadoop/mapred mapred 2> /dev/null || :
+/usr/sbin/useradd --comment "Hadoop MapReduce" -u 202 --shell /bin/bash -M -r --groups hadoop --home /var/lib/hadoop/mapred mapred 2> /dev/null || :
diff --git a/hadoop-mapreduce-project/src/packages/rpm/spec/hadoop-mapred.spec b/hadoop-mapreduce-project/src/packages/rpm/spec/hadoop-mapred.spec
index 70dfe9361b8..85af48fd89a 100644
--- a/hadoop-mapreduce-project/src/packages/rpm/spec/hadoop-mapred.spec
+++ b/hadoop-mapreduce-project/src/packages/rpm/spec/hadoop-mapred.spec
@@ -142,8 +142,8 @@ mv ${RPM_BUILD_DIR}/%{_final_name}/share/* ${RPM_BUILD_DIR}%{_share_dir}
 rm -rf ${RPM_BUILD_DIR}/%{_final_name}/etc
 
 %pre
-getent group hadoop 2>/dev/null >/dev/null || /usr/sbin/groupadd -r hadoop
-/usr/sbin/useradd --comment "Hadoop MapReduce" --shell /bin/bash -M -r --groups hadoop --home %{_var_dir}/mapred mapred 2> /dev/null || :
+getent group hadoop 2>/dev/null >/dev/null || /usr/sbin/groupadd -g 123 -r hadoop
+/usr/sbin/useradd --comment "Hadoop MapReduce" -u 202 --shell /bin/bash -M -r --groups hadoop --home %{_var_dir}/mapred mapred 2> /dev/null || :
 
 %post
 bash ${RPM_INSTALL_PREFIX0}/sbin/update-mapred-env.sh \