public void setMpackMap(Map<Long, Mpack> mpackMap) {
    this.mpackMap = mpackMap;
  }
Parses mpackdirectories during boostrap/ambari-server restart
Reads from /var/lib/ambari-server/mpacks-v2/

@throws IOException
ambari-server/src/main/java/org/apache/ambari/server/mpack/MpackManager.java