https://community.cloudera.com/t5/Support-Questions/both-namenodes-are-standby-how-can-I-active-one-of-them/m-p/146346#M108913 <A rel="user" href="https://community.cloudera.com/users/13937/hassenseoud.html" nodeid="13937">@Jessika314 ninja</A><P>Stop both namenodes. If we are able to recall which was the active namenode last time then just start that namenode and let the other be down.</P><P>Make sure ZKFC and JN's should be running when you do this activity.</P><P>Once the namenode is started, check if its showing Active status in ambari UI. If YES, wait for namenode to come outof safemode.</P><P>If the namenode doesnot show active please check the ZKFC and Namenode logs.</P><P>Once the namenode is out of safe mode start the other namenode and check the status in Ambari UI.</P><P>Let me know if that helps.</P> Mon, 24 Oct 2016 19:53:26 GMT sshimpi 2016-10-24T19:53:26Z