@Koffi  This issue seems linked to your previous posting. Your last healthy name node was nn01, right? The assumption here is you are logged in as root Instructions to fix that one journal node. 1) Put both nn01 and nn02 in safe mode ( NN HA) $ sudo su - hdfs [hdfs@host ~]$ hdfs dfsadmin -safemode enter Safe mode is ON in nn01/<nn01_IP>:8020 Safe mode is ON in nn02/<nn02_IP>:8020   2) Save Namespace [hdfs@host ~]$ hdfs dfsadmin -saveNamespace Save namespace successful for nn01/<nn01_IP>:8020 Save namespace successful for nn02/<nn02_IP>:8020   3) Backup zip/tar the journal dir from a working JN node of (nn01) and copy it to the non-working JN's of  (nn02)node to something like /hadoop/hdfs/journal/<Cluster_name>/current 4) Leave safe mode [hdfs@host ~]$ hdfs dfsadmin -safemode leave Safe mode is OFF in nn01/<nn01_IP>:8020 Safe mode is OFF in nn02/<nn02_IP>:8020   4) Restart HDFS From Ambari you can now start the nn01 first when it comes up then start nn02 Please let me know.   ... View more

@Koffi  From the Ambari UI are you seeing any HDFS alert? ZKFailover Controller or Journalnodes? If so share the logs? ... View more

@Rish  How much memory has your VM quickstart have? Can you open the RM and check using the application_id   the logs should give you an idea of whats happening Geoffrey   ... View more

@Koffi  There are a couple of things here you first need to resolve too many open files issue by checking the ulimit $ ulimit -n To increase for the current session depending on the above output ulimit -n 102400 Edit /etc/security/limits.conf to make the change permanent. Then restart the kdc and kadmin depending on your Linux version systemctl   # /etc/rc.d/init.d/krb5kdc start # /etc/rc.d/init.d/kadmin start   Then restart Atlas from the Ambari UI    Please revert after these actions   Geoffrey                   ... View more

@Phanikondeti  Please can you share how you installed your nifi , version, and install documents followed?  The errors logs would be good to share too. ... View more

@vciampa  The solution is the Replication Manager which enables you to replicate data across data centers for disaster recovery scenarios. Replication Manager replicates HDFS, Hive, and Impala data, and supports Sentry to Ranger replication from CDH (version 5.10 and higher) clusters to CDP Private Cloud Base (version 7.0. 3 and higher) clusters. https://docs.cloudera.com/cdp/latest/data-migration/topics/cdp-data-migration-replication-manager-to-cdp-data-center.html It's easy to use 🙂 Happy Hadooping    ... View more

@vciampa  Please look at this document that performs the steps for upgrading from HDP to CDP Private  Happy hadooping ... View more

@rachida_el-hamm  Here is a very good resource, sit back and sip your coffee or tea. It should help you resolve your MySQL issue  Happy hadooping   ... View more

@Anup123  I responded to a similar question see SSL Sqoop If already have an SSL cert file, then you can generate your own JKS file and import your cert into your jks. ... View more