question Re: AMBARI REST API + how to verify if specific service required restart in Support Questions

AMBARI REST API + how to verify if specific service required restart

mike_bronson7 — Mon, 03 Feb 2020 15:15:20 GMT

hi all

how to verify if specific service required restart?

for example - HDFS service

in case HDFS service required restart then ambari will show this as

is it possible by rest api to understand if service required restart or not?

for example for - YARN / HIVE , etc

Re: AMBARI REST API + how to verify if specific service required restart

HadoopHelp — Mon, 03 Feb 2020 15:17:45 GMT

Hi @mike_bronson7 .

I think you need to continue here:-

https://community.cloudera.com/t5/Support-Questions/how-to-know-if-any-service-in-ambari-cluster-need-to-restart/td-p/228707

Thanks

HadoopHelp

Re: AMBARI REST API + how to verify if specific service required restart

mike_bronson7 — Mon, 03 Feb 2020 15:30:35 GMT

but I am asking diff , we want API that ask about specific service as HDFS or YARN , etc

this post that you mentioned ( https://community.cloudera.com/t5/Support-Questions/how-to-know-if-any-service-in-ambari-cluster-nee... ) is about all services that required restart

note - what we want is API that ask the specific service if required restart or not

Re: AMBARI REST API + how to verify if specific service required restart

Shelton — Mon, 03 Feb 2020 16:36:22 GMT

@mike_bronson7

Can you run the below it should give the desired response

curl -u admin:admin -H "X-Requested-By:ambari" -X GET "http://<ambari-server>:<port>/api/v1/clusters/<clustername>/host_components?HostRoles/stale_configs=false&fields=HostRoles/service_name

Please let me know

Re: AMBARI REST API + how to verify if specific service required restart

mike_bronson7 — Mon, 03 Feb 2020 17:48:04 GMT

I get A long list of all services , , any way not see there the HDFS

but what we want is to verify only specific one service

Re: AMBARI REST API + how to verify if specific service required restart

Shelton — Mon, 03 Feb 2020 19:08:49 GMT

@mike_bronson7

I will not have access to my environment for 4 days as I am traveling but I think you can filter using

service_name=HDFS

I need to test that but that's the way

Re: AMBARI REST API + how to verify if specific service required restart

mike_bronson7 — Mon, 03 Feb 2020 19:23:49 GMT

Dear Shelton ,

enjoy your vacation , and be careful from the corona -:)

Re: AMBARI REST API + how to verify if specific service required restart

mike_bronson7 — Mon, 03 Feb 2020 19:32:04 GMT

any way just for your information we get that

curl -u admin:admin -H "X-Requested-By:ambari" -X GET "http://master_node:8080/api/v1/clusters/HDP/host_components?HostRoles/stale_configs=false&fields=HostRoles/service_name=HDFS"
{
"status" : 400,
"message" : "Unable to compile query predicate: Invalid Query Token: token='=', previous token type=VALUE_OPERAND"

Re: AMBARI REST API + how to verify if specific service required restart

jsensharma — Mon, 03 Feb 2020 21:00:19 GMT

@mike_bronson7

If you just want to find out specific services like HDFS / HIVE /SPARK2 to know whether they require restart or not then you can do this using filtering option service_name.in(xxx,yyy,zzz)

Various Options to get Stale Config Component/Service details.
Similarly there are few other variants of the API call to find out and list the Services/Individual components which require restart.

# curl -u admin:admin -H "X-Requested-By: ambari" -X GET "ttp://kerlatest1.example.com:8080/api/v1/clusters/KerLatest/host_components?HostRoles/stale_configs=true&fields=HostRoles/service_name,HostRoles/host_name" # curl -u admin:admin -H "X-Requested-By: ambari" -X GET "ttp://kerlatest1.example.com:8080/api/v1/clusters/KerLatest/host_components?HostRoles/stale_configs=true" # curl -u admin:admin -H "X-Requested-By: ambari" -X GET "ttp://kerlatest1.example.com:8080/api/v1/clusters/KerLatest/host_components?HostRoles/stale_configs=true&fields=HostRoles/service_name"

How to restart All Stale Configurations using API call.

# curl -u admin:admin -H "X-Requested-By: ambari" -X POST -d '{"RequestInfo":{"command":"RESTART","context":"Restart all required services","operation_level":"host_component"},"Requests/resource_filters":[{"hosts_predicate":"HostRoles/stale_configs=true"}]}' "ttp://kerlatest1.example.com:8080/api/v1/clusters/KerLatest/requests"

Please change the Ambari Hostname/port and Cluster name in the above API calls.
I have changed "http://" to "ttp://" Please correct that protocol prefix before using the above mentioned API calls.

Re: AMBARI REST API + how to verify if specific service required restart

mike_bronson7 — Mon, 03 Feb 2020 21:28:37 GMT

Dear Jay

what to say

excellent answer , you are really one of the best here