https://community.cloudera.com/t5/Support-Questions/The-DataNode-is-not-connected-to-one-or-more-of-its-NameNode/m-p/45186#M46132 <P>Hello,</P><P>&nbsp;</P><P>It may be that the configuration needs to be refreshed (so that the list of datanode hosts is up-to-date).</P><P>Check the Cloudera Manager home page and see if you see a stale configuration icon. &nbsp;If so, you can click on that icon to update the configuration as Cloudera Manager knows it ineeds to do... for some more information on stale configurations, see:</P><P>&nbsp;</P><P><A href="http://www.cloudera.com/documentation/enterprise/latest/topics/cm_mc_stale_configuration.html#xd_583c10bfdbd326ba--6eed2fb8-14349d04bee--7e53__section_asl_z5j_zm" target="_blank">http://www.cloudera.com/documentation/enterprise/latest/topics/cm_mc_stale_configuration.html#xd_583c10bfdbd326ba--6eed2fb8-14349d04bee--7e53__section_asl_z5j_zm</A></P><P>&nbsp;</P><P>If that does not work, then let us know</P><P>&nbsp;</P><P>Ben</P> Fri, 16 Sep 2016 15:14:37 GMT bgooley 2016-09-16T15:14:37Z