https://community.cloudera.com/t5/Support-Questions/namenode-is-not-formatted/m-p/183901#M146059 <P><A rel="user" href="https://community.cloudera.com/users/10310/rchoksi.html" nodeid="10310"></A></P><A rel="user" href="https://community.cloudera.com/users/10310/rchoksi.html" nodeid="10310">@Romil Choksi</A><P>I did. I have only 2 nodes in my cluster. One with nn and snn. other once has yarn, hdfs and zookeeper. first one is master node.</P><P>The entire system went down but the hard disk is safe so there was no data loss for sure.</P><P>We are trying to bring back the services one by one. If I run this on ther node, it says</P><P>What is the best way I can get this working?</P><P>17/04/01 12:15:29 INFO namenode.NameNode: createNameNode [-bootstrapStandby] 17/04/01 12:15:29 ERROR namenode.NameNode: Failed to start namenode. java.io.IOException: org.apache.hadoop.HadoopIllegalArgumentException: HA is not enabled for this namenode. at org.apache.hadoop.hdfs.server.namenode.ha.BootstrapStandby.run(BootstrapStandby.java:426) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1504) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1606) Caused by: org.apache.hadoop.HadoopIllegalArgumentException: HA is not enabled for this namenode. at org.apache.hadoop.hdfs.server.namenode.ha.BootstrapStandby.parseConfAndFindOtherNN(BootstrapStandby.java:378) at org.apache.hadoop.hdfs.server.namenode.ha.BootstrapStandby.run(BootstrapStandby.java:103) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84) at org.apache.hadoop.hdfs.server.namenode.ha.BootstrapStandby.run(BootstrapStandby.java:421) ... 2 more</P> Sat, 01 Apr 2017 13:49:09 GMT simran_k 2017-04-01T13:49:09Z