@irfangk1  Can you please share the files: /var/lib/ambari-agent/data/output-423.txt /var/lib/ambari-agent/data/errors-423.txt   And if possible then the ambari-agent.log from the cluster  node where the above files are generated. You can find the host details where the operation failed by looking at the ambari UI operational logs. ... View more

@rajesh1972  The maven artifact : "hbase-common:1.1.2" which provides the following JAR does. not seems to contain that class "org.apache.hadoop.hbase.types.CopyOnWriteArrayMap" ... you can check this JAR .. https://repo1.maven.org/maven2/org/apache/hbase/hbase-common/1.1.2/hbase-common-1.1.2.jar   So can you please try changing the version of the artifact to 2.0.0 . (instead of 1.1.2) and then see if that works for you? Example:   <dependencies> <dependency> <groupId>org.apache.hbase</groupId> <artifactId>hbase-client</artifactId> <version>2.0.0</version> </dependency> <dependency> <groupId>org.apache.hbase</groupId> <artifactId>hbase-common</artifactId> <version>2.0.0</version> </dependency> </dependencies>   .   If your question is answered then, Please make sure to mark the answer as the accepted solution. If you find a reply useful, say thanks by clicking on the thumbs up button.     . ... View more

@rajesh1972  Can you please share your  "pom.xml" file so that we can check the dependencies which you are including here?   Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.types.CopyOnWriteArrayMap   The problematic/missing class "org.apache.hadoop.hbase.types.CopyOnWriteArrayMap" is part of "hbase-common.jar" JAR so please make sure that your "pom.xml" file contains the dependency to that maven artifact as well.  The "hbase-server" artifact provides the dependency to hbase-common jar. Example:   <dependencies> <dependency> <groupId>org.apache.hbase</groupId> <artifactId>hbase-server</artifactId> <version>${hbase.version}</version> </dependency> <dependency> <groupId>org.apache.hbase</groupId> <artifactId>hbase-client</artifactId> <version>${hbase.version}</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>${hadoop.version}</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>${hadoop.version}</version> </dependency> </dependencies>     Please Notice:     <dependency> <groupId>org.apache.hbase</groupId> <artifactId>hbase-server</artifactId> <version>${hbase.version}</version> </dependency> (OR) <dependency> <groupId>org.apache.hbase</groupId> <artifactId>hbase-common</artifactId> <version>${hbase.version}</version> </dependency>       You can refer to a working pom.xml in my Github repo: https://github.com/jaysensharma/MiddlewareMagicDemos/tree/master/HDP_Ambari/HBase/HBase_Client   hbase-server maven artifact provides the dependency to hbase-common so please include the dependency    # mvn dependency:tree | grep -B3 hbase-common [INFO] +- org.apache.hbase:hbase-server:jar:1.1.2.2.5.3.0-37:compile [INFO] | +- org.apache.hbase:hbase-common:jar:1.1.2.2.5.3.0-37:compile     .   .       ... View more

@ThanhP  Good to know that the issue is resolved.   If your question is answered then, Please make sure to mark the answer as the accepted solution. If you find a reply useful, say thanks by clicking on the thumbs up button. ... View more

@ThanhP The following error indicates that Ambari is not able to connect to the MySQL DB instance. Caused by: com.mysql.cj.jdbc.exceptions.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. Most possible cause might be either there is some network issue of your MySQL might not be running properly (running with errors). We might need to review Mysql side log as well.   Checks from AmbariServer Host side So can you please check if you have entered correct DB url in ambari.properties? Can you please share the following output? # grep 'jdbc' /etc/ambari-server/conf/ambari.properties In the output of the above command we shoudl be able to see the MySQL DB details like user/URl/driver ..etc Can you please try running the following simple JDBC connectivity check from Ambari DB host to the MySQL instance? # /usr/jdk64/jdk1.8.0_112/bin/java -cp /var/lib/ambari-server/resources/DBConnectionVerification.jar:/usr/share/java/mysql-connector-java.jar org.apache.ambari.server.DBConnectionVerification "jdbc:mysql://xxxxxxxxx/ambari" "ambariDBUser" "ambariDBPassword" com.mysql.jdbc.Driver You will need to change the 'ambariDBUser'/ 'ambariDBPassword' and DB url based on the ambari.properties entries. Also from the ambari server host can you please check if the MySQL host&port is accessible without any issue? This is to isolate if the MySQL host & port is accessible from Ambari server host? # telnet $MYSQL_HOSTNAME 3306 (OR) # nc -v $MYSQL_HOSTNAME 3306   Checks from MySQL DB side Please try to restart MySQL DB once. Check if the MySQL is listening to the correct port ? (default port is 3306) # ps -ef | grep mysql # netstat -tnlpa | grep 3306 # netstat -tnlpa | grep `cat /var/run/mysqld/mysqld.pid` For any errors on Mysql side we can check the MySQL log like '# less /var/log/mysqld.log' ... View more