we intend to perform ambari upgrade to 2.6.1 so we read the hortonworks doc - https://docs.hortonworks.com/HDPDocuments/Ambari-2.6.1.3/bk_ambari-upgrade/content/preparing_to_upgrade_ambari_and_hdp.html and about the: ( from the doc ) For Large Clusters "In a large cluster, starting the NameNode can take a long time. To ensure the Ambari requests to start the NameNode do not timeout during the upgrade, you should configure Ambari’s NameNode restart timeout parameter. To do this, add ten percent to the normal amount of time in seconds it takes to start your NameNode when restarted. That value should be used to set the upgrade.parameter.nn-restart.timeout in /etc/ambari-server/conf/ambari.properties on the Ambari Server host. Then, restart Ambari Server before beginning the upgrade." we try to find the "ambari’s NameNode restart timeout parameter from the file: /etc/ambari-server/conf/ambari.properties ( on ambari server machine ) but this parameters isn't exists first question - what is the exactly name of this parameters? second question - what is the amount of the workers in the cluster to set this parameters in the - ambari.properties ? grep timeout /etc/ambari-server/conf/ambari.properties agent.package.install.task.timeout=1800 agent.task.timeout=900 server.http.session.inactive_timeout=1800 server.task.timeout=1200 user.inactivity.timeout.default=0 user.inactivity.timeout.role.readonly.default=0 views.ambari.request.connect.timeout.millis=30000 views.ambari.request.read.timeout.millis=45000 views.request.connect.timeout.millis=5000 views.request.read.timeout.millis=10000 ... View more

how to capture the id request number from API ? for example we stop the service - AMBARI_METRICS and we get the id - 128 from output , so we can use grep to capture the id , but we prefer other elegant way , curl -u admin:admin -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Stop AMBARI_METRICS via REST"}, "Body": {"ServiceInfo": {"state": "INSTALLED"}}}' http://localhost:8080/api/v1/clusters/sys15626/services/AMBARI_METRICS HTTP/1.1 202 Accepted X-Frame-Options: DENY X-XSS-Protection: 1; mode=block X-Content-Type-Options: nosniff Cache-Control: no-store Pragma: no-cache Set-Cookie: AMBARISESSIONID=19rvqn2cgzwb51sfevywdfvwm7;Path=/;HttpOnly Expires: Thu, 01 Jan 1970 00:00:00 GMT User: admin Content-Type: text/plain Vary: Accept-Encoding, User-Agent Content-Length: 137 Server: Jetty(8.1.19.v20160209) { "href" : "http://localhost:8080/api/v1/clusters/sys15626/requests/128", "Requests" : { "id" : 128, "status" : "Accepted" } ... View more

how to create ambari database backup without enter password? we want to create the backup in bash script , so need to automate the CLI ( CLI must be in silent mode ) pg_dump -U {ambari.db.username} -f ambari.sql Password: {ambari.db.password} ... View more