LLAP Service sometimes may fail to startup after HDP upgrade with the following error:    Error:: Caused by: org.apache.hadoop.security.KerberosAuthException: failure to login: for principal: hive/prakash.cloudera.com@CLOUDERA.COM from keytab /grid/0/yarn/local/usercache/hive/appcache/application_**********/container_***********_01_000001/keytabs/llap0.keytab javax.security.auth.login.LoginException: Pre-authentication information was invalid (24)   To resolve this issue, run the following command and start LLAP:  yarn app -destroy llap0 If the issue persists, then do the following   Check the hive.service.keytab file is available in all the hosts, run kinit and test the connectivity. If the file is missing, recreate the keytabs on the missing hosts either through Ambari or manually (see this article for manual keytab creation). Verify the file in HDFS and copy it to the local. Perform kinit with the copied keytab. hdfs:///user/hive/.yarn/keytabs/hive/hive.service.keytab hdfs dfs -copyToLocal /user/hive/.yarn/keytabs/hive/hive.service.keytab /tmp/hive.keytab kinit -kt /tmp/hive.keytab hive/prakash.cloudera.com@CLOUDERA.COM kinit: Preauthentication failed while getting initial credentials  If you get the error, to move the keytab file from hdfs location. hdfs dfs -cp /user/hive/.yarn/keytabs/hive/hive.service.keytab /tmp/ hdfs dfs -rm /user/hive/.yarn/keytabs/hive/hive.service.keytab Start LLAP component.     ... View more

STOP Command:: curl -u admin:admin -H "X-Requested-By:ambari" -i -X PUT http://172.26.78.29:8080/api/v1/clusters/Mycluster/hosts/prakash-ambariagent-node3/host_components/FLUME_HANDLER -d '{"RequestInfo":{"context":"Stop Flume","operation_level":{"level":"HOST_COMPONENT","cluster_name":"Mycluster","host_name":"prakash-ambariagent-node3","service_name":"FLUME"}},"Body":{"HostRoles":{"state":"INSTALLED"}}}' START Command:: curl -u admin:admin -H "X-Requested-By:ambari" -i -X PUT http://172.26.78.29:8080/api/v1/clusters/Mycluster/hosts/prakash-ambariagent-node3/host_components/FLUME_HANDLER -d '{"RequestInfo":{"context":"Start Flume","operation_level":{"level":"HOST_COMPONENT","cluster_name":"Mycluster","host_name":"prakash-ambariagent-node3","service_name":"FLUME"}},"Body":{"HostRoles":{"state":"STARTED"}}}' RESTART Command:: curl --insecure -v -u admin:admin -H "X-Requested-By:ambari" -i -X POST http://prakash-ambariserver-node1:8080/api/v1/clusters/Mycluster/requests -d '{"RequestInfo":{"command":"RESTART","context":"Restart all components for Flume","operation_level":{"level":"SERVICE","cluster_name":"Mycluster","service_name":"FLUME"}},"Requests/resource_filters":[{"service_name":"FLUME","component_name":"FLUME_HANDLER","hosts":"prakash-ambariagent-node3"}]}' Note::Replace the ambari server host and clustername with your cluster details and execute the curl commands. ... View more