While installing HDP components using Ambari some times it fails with below errors. raise Fail("Cannot match package for regexp name {0}. Available packages: {1}".format(name, self.available_packages_in_repos)) resource_management.core.exceptions.Fail: Cannot match package for regexp name zookeeper_${stack_version}. Available packages: [] What does this mean? basically Ambari is unable to find the packages. the possible reasons can be, Reason1: Is that host already have that binaries installed? If it is already installed using different repo-name then Ambari would not be able to determine those binaries. You can find out that by running yum list installed | grep zookeeper This tells using which tag/repo it was installed (look for specific HDP version). If you find entry and it was installed different tag/repo then manually remove above packages and attempt to install again. Reason2: Its possible that provided URL does not have those binaries. you can determine by running below command yum list available | grep zookeeper If it is not returning any list for that version then check tag/repoURL defined in Ambari to make sure it is correct. ... View more

Ambari 2.7 provides UI for API to learn and perform many of the operations. You can launch the UI and play - http://AMBARI-UI:8080/api-docs/ For example: You can delete the Host by simply entering the hostname in the UI. 1. Go to http://AMBARI-HOST:8080/api-docs/#!/Hosts/deleteHost 2. Move to "Delete a host" section 3. Enter the "hostname" 4. click on "Try" . Window popup shows the API response with response (errors) message and code like below. Similar many other Services/Groups/users API can be tried in the same page. This feature makes life easies to find and use the APIs. ... View more

Starting from Ambari 2.7 there are 2 new features to track who did what. 1. In operations history - for every operation there is a user name associated. 2. In Prior versions there is no way to find out who launched Install/Add wizards. Starting from 2.7 there is Username name being shows in the UI. These features make Administrators life easier to track who did what. ... View more

With Ambari 2.6.0 or 2.5.x version if you try to use 2.6.3 ( http://public-repo-1.hortonworks.com/HDP/centos7/2.x/updates/2.6.4.0/HDP-2.6.4.0-91.xml) or 2.6.4 -) http://public-repo-1.hortonworks.com/HDP/centos7/2.x/updates/2.6.3.0/HDP-2.6.3.0-235.xml ) VDF files, it fails to load/parse the files - would see below error in the logs.f "like An internal system exception occurred: Could not load url from http://public-repo-1.hortonworks.com/HDP/centos7/2.x/updates/2.6.4.0/HDP-2.6.4.0-91.xml. null" Those VDF files has GPL tag URLs and these ambari versions can't understand it - hence fails with the above error. You can consider Upgrading the Ambari to 2.6.1 or later versions. If you want to continue using 2.6.0 or earloer Ambari versions then you may have to create private repo and download GPL binaries and work without GPL tags in VDF file. you can contact Hortonworks support for any further help. ... View more