question Re: Uninstall Falcon in Support Questions

Uninstall Falcon

vtpcnk — Tue, 14 Mar 2017 03:37:31 GMT

Given the 503 error we are getting when trying to open the Falcon Web UI, our support engineer has recommended that we uninstall and reinstall falcon.

So I did a bit of research and found this command :

curl -u $USER:$PASS -i -H 'X-Requested-By: ambari'-X DELETE  http://$AMBARI_HOST:$AMBARI_PORT/api/v1/clusters/<cluster-name>/services/<service-name>;

So the $AMBARI_HOST in above command is the host on which Ambari is running - and not the host Falcon is running?

And what is the $AMBARI_PORT/port number to be used in the above command - 8080?

The USER/PASS is root and its password or falcon and its password? (I had done the HDP/Ambari installation as root).

Appreciate the clarification.

Re: Uninstall Falcon

namaheshwari — Tue, 14 Mar 2017 03:44:10 GMT

Yes $AMBARI_HOST is the ambari server host
$AMBARI_PORT is the port you use for logging into Ambari by default 8080, unless you are using Wire encryption, for that case it will be 8443
The USER/PASS are the ones you use to logon to ambari, generally the 'admin' user and its password.

Re: Uninstall Falcon

pvillard — Tue, 14 Mar 2017 03:46:15 GMT

Non related to your question, but is your 503 issue related to:

https://community.hortonworks.com/articles/76537/falcon-web-ui-is-inaccessiblehttp-503-error-and-am.html

Depending of the HDP version you have, an external dependency must be downloaded from the internet to get Falcon UI working.

Re: Uninstall Falcon

vtpcnk — Tue, 14 Mar 2017 20:59:41 GMT

Yes I did check that but the said jar file is already available in our installation. Thanks

Re: Uninstall Falcon

vtpcnk — Tue, 14 Mar 2017 21:00:28 GMT

Thanks for the response. And BTW how to reinstall Falcon? Appreciate the feedback.

Re: Uninstall Falcon

namaheshwari — Tue, 14 Mar 2017 23:12:03 GMT

You can follow doc to Install Falcon using Ambari UI or through the command line:

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.5.3/bk_data-movement-and-integration/content/ch_falcon_install_upgrade.html

Re: Uninstall Falcon

namaheshwari — Wed, 15 Mar 2017 11:41:23 GMT

@n c - Can you please upvote and accept the answer, if it resolved your issue. Thanks

Re: Uninstall Falcon

vtpcnk — Wed, 15 Mar 2017 21:42:39 GMT

Our vendor asked us to use this for removing falcon :

https://cwiki.apache.org/confluence/display/AMBARI/Using+APIs+to+delete+a+service+or+all+host+components+on+a+host

But the path given in the first command itself I cannot find in my installation :

http://AMBARI_SERVER_HOST:8080/api/v1/clusters/c1/services/SERVICENAME

Is the above path local to the installation given in the example?

By "SERVICE" I am equating with falcon as that is the service I am trying to remove.

When I searched for falcon in the Ambari host I got a bunch of directories - but substituting any of the directories in the above command only got me :

{ "status": 404, "message": "Not Found" }

Re: Uninstall Falcon

jsensharma — Wed, 15 Mar 2017 21:55:48 GMT

@n c

If you are accessing the URL: http://AMBARI_SERVER_HOST:8080/api/v1/clusters/c1/services/FALCON

And getting 404 which means FALCON service is not installed on your cluster.

You can list all the services that are installed on the cluster as following: http://AMBARI_SERVER_HOST:8080/api/v1/clusters/c1/services

Re: Uninstall Falcon

vtpcnk — Wed, 15 Mar 2017 22:34:41 GMT

When I ran your command got this :

{
  "status": 403,
  "message": "Full authentication is required to access this resource"
}

Re: Uninstall Falcon

jsensharma — Wed, 15 Mar 2017 22:37:13 GMT

@n c

While using web browser, You will need to open the http://AMBARI_SERVER_HOST:8080 URL first in the browser then it will ask for username or password . One you are authenticated then you can open the previously mentioned URL. http://AMBARI_SERVER_HOST:8080/api/v1/clusters/c1/services

If you are using Curl or wget then you can simply use the following:

curl -u $USER:$PASS -i -H 'X-Requested-By: ambari'  -X GET http://AMBARI_SERVER_HOST:8080/api/v1/clusters/c1/services

Re: Uninstall Falcon

namaheshwari — Wed, 15 Mar 2017 23:17:42 GMT

Hi @n c - Can you please post the exact command you are trying and any stack trace / screenshots for your issue.

Also, when you logon to Ambari, can see Falcon as a service on the Ambari UI.

Re: Uninstall Falcon

vtpcnk — Thu, 16 Mar 2017 02:58:57 GMT

Thanks. I was missing the cluster name in the command. Thanks again.

Re: Uninstall Falcon

bandalora — Thu, 16 Mar 2017 03:57:29 GMT

As mentioned by Namit, do be sure to follow the Prerequisite instructions under https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.5.3/bk_data-movement-and-integration/content/ch_falcon_install_upgrade.html before reinstalling. If you encounter any issues with these instructions, please let me know.

Re: Uninstall Falcon

namaheshwari — Wed, 22 Mar 2017 05:35:59 GMT

Is there any more help needed here. Thanks