how to delete worker node from cluster

[#1]

our 3 master machines was crashed , and we build new 3 masters machines ( without to delete the workers )

so now we need to re-add the current workers to the cluster

when we add the workers machine to the ambari cluster we stuck in point that wizard tell us the worker already installed

how to solve this issuie from this point ?

[#2]

@uri ben-ari

Check /etc/hosts of the Ambari server and make sure the old entries are removed ,realce with the new one.

DELETE all host components mapped to this host in this case DATANODE

curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTERNAME/hosts/HOSTNAME/host_components/DATANODE DELETE the host 

curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTERNAME/hosts/HOSTNAME 

And you will need to restart all stale config

[#3]

regarding to two API , can you give me example , because I not sure if some of them need to set as values or should be as default

[#4]

another question , as you know all workers are not appears cluster ( because all master machines are new ) , so not understand how we can use the API in that case

[#5 · Accepted solution]

@uri ben-ari

curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://{your_ambari_server}:8080/api/v1/clusters/{your_cluster_name}/hosts/{dead_host}

Example

curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://test.co.uk:8080/api/v1/clusters/hdp26/hosts/datanode2