@Michael Bronson Zookeeper is a light weight process hence it won't consume too much resource. (EDIT😞 However there is the following recommendation from Hortonworks (For Kafka + Zookeeper) : https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.4/bk_kafka-component-guide/content/kafka-zookeeper-multiple-apps.html Here are several recommendations for ZooKeeper configuration with Kafka: Do not run ZooKeeper on a server where Kafka is running. When using ZooKeeper with Kafka you should dedicate ZooKeeper to Kafka, and not use ZooKeeper for any other components. Make sure you allocate sufficient JVM memory. A good starting point is 4GB. To monitor the ZooKeeper instance, use JMX metrics. . As far as high availability is concerned for zookeepers then you can refer to the following HCC thread which talks about more on How to decide, how many zookeepers should I have? https://community.hortonworks.com/questions/35287/how-to-decide-how-many-zookeepers-should-i-have.html it depends on your requirement and then based on the requirement we can decide the number of ZK hosts as 3 or 5 (..etc). More ZK comes with a cost so please go through the above thread. ... View more

@Michael Bronson Please refer to the following link which provides the HDP 2.6.4 offline repos. https://docs.hortonworks.com/HDPDocuments/Ambari-2.6.1.5/bk_ambari-installation/content/hdp_26_repositories.html . From that link based on your OS type you can download the "HDP-2.6.4.0-XXXXX-rpm.tar.gz" files and then after extracting that file you should eb able to find the Zookeeper RPM as well. Example for CentOs7 (RHEL7) RPMs for HDP2.6.4 http://public-repo-1.hortonworks.com/HDP/centos7/2.x/updates/2.6.4.0/HDP-2.6.4.0-centos7-rpm.tar.gz ... View more

@Michael Bronson Kafka uses zookeeper https://kafka.apache.org/documentation/#brokerconfigs , hence in HDP common services you will find that Kafka has a dependency to Zookeeper. Example: # grep -B4 -A4 'ZOOKEEPER' /var/lib/ambari-server/resources/common-services/KAFKA/0.8.1/metainfo.xml           <versionAdvertised>true</versionAdvertised>           <rollingRestartSupported>true</rollingRestartSupported>           <dependencies>             <dependency>               <name>ZOOKEEPER/ZOOKEEPER_SERVER</name>               <scope>cluster</scope>               <auto-deploy>                 <enabled>true</enabled>               </auto-deploy> --         <scriptType>PYTHON</scriptType>         <timeout>300</timeout>       </commandScript>       <requiredServices>         <service>ZOOKEEPER</service>       </requiredServices>       <configuration-dependencies>         <config-type>kafka-broker</config-type>         <config-type>kafka-env</config-type> . https://github.com/apache/ambari/blob/release-2.6.2/ambari-server/src/main/resources/common-services/KAFKA/0.8.1/metainfo.xml#L34-L42 ... View more

@Chhaya Vishwakarma 0. Are you entering the Correct Ambari Server Host Name & Port in the rest URL ? (or by mistake it is pointing to a freshly installed ambari server host) ? 1. Are you sure that ambari DB was not reset? (Did some one rest the ambari DB) 2. Do you see the cluster creation wizard shown when you login to the UI ? (if yes then may be the ambari DB is reset or ambari server is pointing to wrong DB which does not have cluster info) 3. Please grep the Ambari DB details from the following output and then check the "clusters" table detail. # grep jdbc /etc/ambari-server/conf/ambari.properties 4. What output do you see when you run the following SQL query in amabri DB? # SELECT * FROM clusters; 5. Can you please share the complete output of "/var/log/ambari-server/ambari-server.log" ... View more

@Alampally Vinith The error indicates that your MySQL Server seems may not be running healthy. The MYSQl server is not responding to the jdbc call of the driver. Please check DB connection properties. com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure  The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server . Please try to restart your MySQL Server and then verify the mysql connectivity from oozie host. . ... View more

@Chhaya Vishwakarma As you are using PPC system so can you please try using the PPC repo instead? # wget -nv  http://public-repo-1.hortonworks.com/ambari/centos7-ppc/2.x/updates/2.7.3.0/ambari.repo  -O /etc/yum.repos.d/ambari.repo # yum clean all # yum upgrade ambari-server https://docs.hortonworks.com/HDPDocuments/Ambari-2.7.3.0/bk_ambari-installation-ppc/content/download_the_ambari_repo.html Your ambari.repo should be looking like this for IBM Power Systems (PPC) #VERSION_NUMBER=2.7.3.0-139 [ambari-2.7.3.0] #json.url = http://public-repo-1.hortonworks.com/HDP/hdp_urlinfo.json name=ambari Version - ambari-2.7.3.0 baseurl=http://public-repo-1.hortonworks.com/ambari/centos7-ppc/2.x/updates/2.7.3.0 gpgcheck=1 gpgkey=http://public-repo-1.hortonworks.com/ambari/centos7-ppc/2.x/updates/2.7.3.0/RPM-GPG-KEY/RPM-GPG-KEY-Jenkins enabled=1 priority=1 . ... View more