64-node cluster one node is bad..no longer communicates  I want to remove him from the cluster   ch-8 10.71.0.108 /default CDH 5 Cluster 1 2 Role(s) Good Health 12.38s ago ch-9 10.71.0.109 /default Unknown Cluster 1 2 Role(s) Bad Health None   here he is in the hosts. he's a data node and a nodemanager (yarn)   When I try to delete, it tells me Delete Hosts The following 1 host(s) cannot be deleted because they have role instances or are not completely decommissioned: Host Role Instances ch-9 nodemanager (ch-9) and 1 other role(s). If I try this, it doesn't work Remove Hosts From Cluster Removing these hosts will stop and delete all roles running on them and then remove them from their clusters. The hosts will still be managed by Cloudera Manager and can be utilized after being added to new or existing clusters. Role data directories will not be deleted. Host Role ch-9 NodeManager, DataNode Decommission Roles (Warning: Removing the hosts without decomissioning the roles running on them can result in permanent data loss.) Skip Management Roles        Command Details: Hosts Decommission Command Context Status Started at Ended at Hosts Decommission Finished Mar 31, 2014 1:09:28 PM PDT Mar 31, 2014 1:09:28 PM PDT Command 'DecommissionWithWait' failed for service 'yarn'       Child Commands All   Failed Only   Active Only Command (Child commands) Context Status Started at Ended at Decommission (2) YARN (MR2 Included) Finished Mar 31, 2014 1:09:28 PM PDT Mar 31, 2014 1:09:28 PM PDT Failed to perform decommission.      Basically, if I can't talk to the node, I can't stop/decommission/delete him How should I do it? ... View more