How do I stop a NiFi role on a single host?

Question

I can stop all role instances...curl -v -k -u me:$pass -X POST "https://host.domain:7183/api/v54/clusters/cluster1/services/NIFI/roleCommands/stop" -H "accept: application/json" -H "Content-Type: application/json" -d "{ \"items\": [ \"NIFI_NODE1\", \"NIFI_NODE2\" ]}"...but not the role on NIFI_NODE1 only. I am trying to write a script which detects that a node has disconnected, stops the role on that host, moves the flow.xml and flow.json and then restarts the role on that host.Is there anything that lets me stop and start a role on a single host?

upadhyayk04 · Accepted Answer

Hello @EFasdfSDfaSDFG

Thank you for reaching out to Cloudera Commnuity

Yes stopping a particular role is possible. Please try the below steps

Please get the roles running on a particular host using the following endpoint

https://FQDN_CLUSTER:7183/api/v48/hosts/<host-uuid>?view=FULL

Replace host FQDN and Cluster UUID above and now copy the exact role name

For eg>>

"clusterName" : "Cluster 1", "serviceName" : "SOLR-1", "roleName" : "SOLR-1-SOLR_SERVER-edf000ebd88d4bc569416c779527523d", "healthSummary" : "CONCERNING", "roleStatus" : "STARTED"

Then stop using the below API

curl -X POST "https://<CLuster-FQND>:7183/api/v57/clusters/<Cluster-name>/services/SOLR-1/roleCommands/stop" -H "accept: application/json" -H "Content-Type: application/json" -d "{ \"items\": [ \"SOLR-1-SOLR_SERVER-edf000ebd88d4bc569416c779527523d\" ]}"

Let me know if that helps

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upadhyayk04 · Answer

@EFasdfSDfaSDFG Great, glad to know that the issue is resolvedThanks again

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