Hi @owen chaos As Jay mentioned, this is supported in Ambari 2.7 with HDP 3 Have a look at the following document, from page 34 onwards, The HDFS NameNode High Availability feature enables you to run redundant NameNodes in the same cluster in an Active/Passive configuration with a hot standby. This eliminates the NameNode as a potential single point of failure (SPOF) in an HDFS cluster. As of Hadoop 3.0, you can configure more than one backup NameNode. ... This guide provides an overview of the HDFS NameNode High Availability (HA) feature, instructions on how to deploy Hue with an HA cluster, and instructions on how to enable HA on top of an existing HDP cluster using the Quorum Journal Manager (QJM) and ZooKeeper Failover Controller for configuration and management. Using the QJM and ZooKeeper Failover Controller enables the sharing of edit logs between the Active and Standby NameNodes. mainly, this is where you setup multiple NN's in ambari 2.7 with hdp3; <property> <name>dfs.ha.namenodes.mycluster</name> <value>nn1,nn2,nn3</value> <description>Unique identifiers for each NameNode in the nameservice</description> </property><br> Also, note; the minimum number of NameNodes for HA is two, but you can configure more. You should not exceed five NameNodes due to communication overhead. Three NameNodes are recommended. ... View more

Hi @subhash parise What did you set the ownership to for the version-2 folder and contents? It should be zookeeper:hadoop and zookeeper (owner) should have write permissions. Did you also check that you can traverse the folder structure, as the zookeeper user? Ex does this work; [root@host]# su - zookeeper [zookeeper@host ~]$ cd /data/hadoop/zookeeper/version-2/ [zookeeper@host version-2]$ ls -al drwxr-xr-x. 2 zookeeper hadoop 4096 Aug 27 08:03 . drwxr-xr-x. 3 zookeeper hadoop 4096 Aug 27 08:03 .. -rw-r--r--. 1 zookeeper hadoop 1 Aug 27 08:03 acceptedEpoch -rw-r--r--. 1 zookeeper hadoop 1 Aug 27 08:03 currentEpoch -rw-r--r--. 1 zookeeper hadoop 67108880 Aug 28 10:52 log.100000001 -rw-r--r--. 1 zookeeper hadoop 296 Aug 27 08:03 snapshot.0 ... View more

Hi @Taehyeon Lee From your error; Failed to download file from http://master:8080/resources/mysql-connector-java.jar due to HTTP error: HTTP Error 404: Not Found Try this on the ambari server host; sudo yum install mysql-connector-java* ls -al /usr/share/java/mysql-connector-java.jar cd /var/lib/ambari-server/resources/ ln -s /usr/share/java/mysql-connector-java.jar mysql-connector-java.jar ... View more

Is TEZ installed on your cluster? From the "Upgrading Timeline Server 1.0 to 1.5" documentation; If you have Tez enabled, the tez-client must be installed on the ATS server. You must also perform this additional step: <property> <name>yarn.timeline-service.entity-group-fs-store.group-id-plugin-classes</name> <value>org.apache.tez.dag.history.logging.ats.TimelineCachePluginImpl</value> </property> Install the TEZ client on the ATS Server if you haven't got this already. If you already have the TEZ client installed on the ATS server, we may have to try a reinstall of the TEZ client on that host. ... View more

@Bhushan Kandalkar AcceptSecurityContext error, data 52e, v2580 52e means invalid credentials. This is most likely down to a bad pass for the bind dn account, or perhaps the bind account you're using is locked. ... View more

Hi @ibrahima diattara You should be able to use the below rest api example, and the "name" will be listed in the output. curl -i -X GET http://<your nifi host>:9090/nifi-api/processors/41ffd1f6-0165-1000-0000-00006974a11c ... View more