https://community.cloudera.com/t5/Support-Questions/Failed-to-start-secondary-namenode/m-p/206263#M168225 <P>I have done the configuration HA for YARN, I followed the wisard in enable ResourceManager HA to enable the nameode and Snamenode. and for some raison I cancel the wizard in the last step, I thought I can done it again later.</P><P>So when I cancel the config process all services turn off and I got lot of alerts (scary!! right).</P><P>so I tried to restart all the services but I could not. there is something wrong With my Snamenode.</P><P>in addition when I try to start the service I see that the service Snamenode in my standby namenode is in maintenance mode </P><P>This is the erreur msg:</P><PRE>2017-11-17 17:19:10,364 INFO namenode.SecondaryNameNode (LogAdapter.java:info(45)) - registered UNIX signal handlers for [TERM, HUP, INT] 2017-11-17 17:19:10,770 FATAL namenode.SecondaryNameNode (SecondaryNameNode.java:main(673)) - Failed to start secondary namenode java.io.IOException: Cannot use SecondaryNameNode in an HA cluster. The Standby Namenode will perform checkpointing. at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.&lt;init&gt;(SecondaryNameNode.java:187) at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main(SecondaryNameNode.java:671) 2017-11-17 17:19:10,773 INFO util.ExitUtil (ExitUtil.java:terminate(124)) - Exiting with status 1 2017-11-17 17:19:10,776 INFO namenode.SecondaryNameNode (LogAdapter.java:info(45)) - SHUTDOWN_MSG: </PRE><P> and this is the entire error msg:</P><P><A href="https://community.cloudera.com/legacyfs/online/attachments/43635-error-body.txt">error-body.txt</A></P> Mon, 20 Nov 2017 17:41:43 GMT sihi_yassine 2017-11-20T17:41:43Z