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diff --git a/test/src/itest-common/src/main/groovy/org/apache/bigtop/itest/posix/UGI.groovy b/test/src/itest-common/src/main/groovy/org/apache/bigtop/itest/posix/UGI.groovy
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+++ b/test/src/itest-common/src/main/groovy/org/apache/bigtop/itest/posix/UGI.groovy
@@ -0,0 +1,78 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.bigtop.itest.posix
+
+class UGI {
+  /**
+   * Local cache for POSIX user information (as specified in /etc/passwd).
+   * The key is a username and values are maps with the following information for
+   * each user: passwd (password), uid (numeric user ID), gid (numeric group ID),
+   * descr (textual user description), home (user home directory),
+   * shell (default shell of the user).
+   *
+   * NOTE: all these bits of information are stored as Strings (even uid, gid).
+   */
+  Map users;
+  /**
+   * Local cache for POSIX group information (as specified in /etc/group).
+   * The key is a groupname and values are maps with the following information for
+   * each group: passwd (password), gid (numeric group ID), users (list of all users
+   * belonging to this group as reported by id(1)).
+   *
+   * NOTE: all these bits of information are stored as Strings (even gid).
+   */
+  Map groups;
+
+  /**
+   * Synchronizes caches (users and groups) with /etc/passwd and /etc/group
+   */
+  public void refresh() {
+    users = [:];
+    groups = [:];
+    Map tmp_groups = [:];
+    (new File("/etc/passwd")).eachLine {
+      // NOTE: the :x bit is a workaround for split to work on strings like +::::::
+      def chunks = "${it}:x".split(':');
+      users[chunks[0]] = [ passwd : chunks[1],
+                           uid    : chunks[2],
+                           gid    : chunks[3],
+                           descr  : chunks[4],
+                           home   : chunks[5],
+                           shell  : chunks[6],
+                         ];
+      tmp_groups[chunks[3]] = chunks[0];
+    }
+    (new File("/etc/group")).eachLine {
+      def chunks = it.split(':');
+
+      groups[chunks[0]] = [ passwd : chunks[1],
+                            gid    : chunks[2],
+                            users  : ((chunks.size() == 4) ? chunks[3].split(',').toList() : []),
+                          ];
+
+      if (tmp_groups[chunks[2]] != null) {
+        groups[chunks[0]].users.add(tmp_groups[chunks[2]]);
+      }
+    }
+  }
+
+  public UGI() {
+    refresh();
+  }
+}