question Re: How do I stop a NiFi role on a single host? in Support Questions

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

EFasdfSDfaSDFG — Thu, 26 Jun 2025 06:19:51 GMT

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?

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

upadhyayk04 — Thu, 26 Jun 2025 06:50:04 GMT

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

EFasdfSDfaSDFG — Thu, 26 Jun 2025 07:40:21 GMT

Thank you, that's awesome. I wasn't escaping the JSON correctly.

This works for me:

/api/v54/clusters/cluster1/services/NIFI/roleCommands/stop" -H "accept: application/json" -H "Content-Type: application/json" -d "{ \"items\": [ \"NIFI_NODE1\"]}"

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

upadhyayk04 — Fri, 27 Jun 2025 05:30:03 GMT

@EFasdfSDfaSDFG Great, glad to know that the issue is resolved

Thanks again