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• Ensure no java processes are running. Note, jps may not always show all the processes.
• Remove rpm packages
  • Ensure all packages corresponding to HDP.repo and HDP-UTIL-*.repo are removed (if any other stack was deployed you can apply a similar logic based on the corresponding repo file name)
  • Typically, installed packages are: sqoop.noarch,lzo-devel.x86_64,hadoop-libhdfs.x86_64,rrdtool.x86_64,hbase.noarch,pig.noarch,lzo.x86_64,ambari-log4j.noarch,oozie.noarch,oozie-client.noarch,gweb.noarch,snappy-devel.x86_64,hcatalog.noarch,python-rrdtool.x86_64,nagios.x86_64,webhcat-tar-pig.noarch,snappy.x86_64,libconfuse.x86_64,mysql.x86_64,webhcat-tar-hive.noarch,ganglia-gmetad.x86_64,extjs.noarch,hive.noarch,hadoop-lzo.x86_64,hadoop-lzo-native.x86_64,hadoop-native.x86_64,hadoop-pipes.x86_64,nagios-plugins.x86_64,hadoop.x86_64,zookeeper.noarch,mysql-libs.x86_64,mysql-connector-java.noarch,mysql-server.x86_64,hadoop-sbin.x86_64,ganglia-gmond.x86_64,libganglia.x86_64,perl-rrdtool.x86_64
  • Essentially, if you do a "yum list installed | grep HDP", and "yum list installed | grep HDP-UTILS" after removal the result should be empty
• Remove repo file at /etc/yum.repos.d/
  • HDP.repo and HDP-epel.repo
• Remove, if exists, alternatives at /etc/alternatives (use "alternative --display {alt-name}" to see and "alternative ---remove {alt-name} {folder-name}" to remove
  hadoop-etc,zookeeper-conf,hbase-conf,hadoop-log,hadoop-lib,hadoop-default,oozie-conf,hcatalog-conf,hive-conf,hadoop-man,sqoop-conf,hadoop-conf
• Remove users – only if local users are created during HDP installations. If ldap users are used then do not remove users.
  Default user names are: nagios,hive,ambari-qa,hbase,oozie,hcat,mapred,hdfs,rrdcached,zookeeper,mysql,sqoop
• Remove the following folders if they exist
  /etc/hadoop,/etc/hbase,/etc/hcatalog,/etc/hive,/etc/ganglia,/etc/nagios,/etc/oozie,/etc/sqoop,/etc/zookeeper,/var/run/hadoop,/var/run/hbase,/var/run/hive,/var/run/ganglia,/var/run/nagios,/var/run/oozie,/var/log/hadoop,/var/log/hbase,/var/log/hive,/var/log/nagios,/var/log/oozie,/var/log/zookeeper,/usr/lib/hbase,/usr/lib/hcatalog,/usr/lib/hive,/usr/lib/oozie,/usr/lib/sqoop,/usr/lib/zookeeper,/var/lib/hive,/var/lib/ganglia,/var/lib/oozie,/var/lib/zookeeper,/var/tmp/oozie,/tmp/hive,/tmp/nagios,/tmp/ambari-qa,/tmp/sqoop-ambari-qa,/var/nagios,/hadoop/oozie,/hadoop/zookeeper,/hadoop/mapred,/hadoop/hdfs,/tmp/hadoop-hive,/tmp/hadoop-nagios,/tmp/hadoop-hcat,/tmp/hadoop-ambari-qa,/tmp/hsperfdata_hbase,/tmp/hsperfdata_hive,/tmp/hsperfdata_nagios,/tmp/hsperfdata_oozie,/tmp/hsperfdata_zookeeper,/tmp/hsperfdata_mapred,/tmp/hsperfdata_hdfs,/tmp/hsperfdata_hcat,/tmp/hsperfdata_ambari-qa
• Perform and "ls --al" at /tmp to ensure that there exists no folder with integer with the owner/group id. This typically means that these folders were associated with some deleted user/group. Remove these folders.

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When hosts are registered, the Ambari UI report issues as follows:

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/usr/lib/python2.6/site-packages/ambari_agent/HostCleanup.py script can be invoked to perform cleanup of individual hosts. "python /usr/lib/python2.6/site-packages/ambari_agent/HostCleanup.py" is an interactive call and asks if "users" should be deleted. This is because for many setup may not want to remove users. Use --help to see other options.

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