@tyadav  HDP Sandbox is a learning setup which has a single node cluster with lots of services deployed to it. So usually when you say "Start All Services" then it will attempt to start all the services that are not put into maintenance ... Which will create much load on the VM.   So ideally it will be best to just STOP the services that you are currently not using and then put them in Maintenance Mode. Then try to start the required services.   The Just start the services that you actually need for testing that way the load on the Sandbox host will be much less and you will find that operations will be executing much faster and you will also see some free memory on the sandbox host. ... View more

@peter_svarc  You can open the link : https://docs.cloudera.com/HDPDocuments/HDP3/HDP-3.1.4/index.html Then at the Top left corner you can change the desired version "3.1.4 / 3.1.0 ...etc" . 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

@yukti  You seems to be using incorrect version of "hive-exec" / "hive-metastore" JAR. Can you please tell me from where did you get the 3.1.0.;0-78 version of JARs (as your Kafka jar version is"kafka-handler-3.1.0.3.1.0.0-78.jar" so looks like you might have downloaded that JAR from HDP 3.1 installation?  Is that correct?  If yes then can you also take the hive-metastore JAR of the same version and then try.   You can see the difference here between "hive-metastore-3.1.0.3.1.0.0-78.jar" and "hive-metastore-0.9.0.jar" JARs. From my HDP 3.1 installation.   # ls -l /usr/hdp/3.1.0.0-78/hive/lib/hive-metastore.jar lrwxrwxrwx. 1 root root 35 Feb 22 2019 /usr/hdp/3.1.0.0-78/hive/lib/hive-metastore.jar -> hive-metastore-3.1.0.3.1.0.0-78.jar # /usr/jdk64/jdk1.8.0_112/bin/javap -cp /usr/hdp/current/hive-metastore/lib/hive-standalone-metastore-3.1.0.3.1.0.0-78.jar org.apache.hadoop.hive.metastore.DefaultHiveMetaHook Compiled from "DefaultHiveMetaHook.java" public abstract class org.apache.hadoop.hive.metastore.DefaultHiveMetaHook implements org.apache.hadoop.hive.metastore.HiveMetaHook { public org.apache.hadoop.hive.metastore.DefaultHiveMetaHook(); public abstract void commitInsertTable(org.apache.hadoop.hive.metastore.api.Table, boolean) throws org.apache.hadoop.hive.metastore.api.MetaException; public abstract void preInsertTable(org.apache.hadoop.hive.metastore.api.Table, boolean) throws org.apache.hadoop.hive.metastore.api.MetaException; public abstract void rollbackInsertTable(org.apache.hadoop.hive.metastore.api.Table, boolean) throws org.apache.hadoop.hive.metastore.api.MetaException; }     . On the other have we can see that "hive-metastore-0.9.0.jar" jar does not contains that class.   # /usr/jdk64/jdk1.8.0_112/bin/javap -cp /tmp/hive-metastore-0.9.0.jar org.apache.hadoop.hive.metastore.DefaultHiveMetaHook Error: class not found: org.apache.hadoop.hive.metastore.DefaultHiveMetaHook   .   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

@yukti  You seems to be using OLD  "hive-metastore-0.9.0.jar" JAR file. When you are using it with "kafka-handler-3.1.0.3.1.0.0-78.jar" jar.   Do you see the mentioned class inside your JAR?   # javap -cp /PATH/TO/hive-metastore-0.9.0.jar org.apache.hadoop.hive.metastore.DefaultHiveMetaHook       As i see your Kafka JAR version as "kafka-handler-3.1.0.3.1.0.0-78.jar"  Which has a Dependency to . hive-exec module of the same version i guess.  Just try to look at the "kafka-handler-3.1.0.3.1.0.0-78.jar"/META-INF/maven/org.apache.hive/kafka-handler/pom.xml" . file and then you will see that it needs the same verison of hive-exec   # grep 'hive-exec' -A2 META-INF/maven/org.apache.hive/kafka-handler/pom.xml <artifactId>hive-exec</artifactId> <scope>provided</scope> <version>${project.version}</version>       So i guess you should be using the following JAR (if you are using HDP installation)     /usr/hdp/current/hive-metastore/lib/hive-standalone-metastore-3.1.0.3.1.0.0-78.jar OR /usr/hdp/current/hive-metastore/lib/hive-exec-3.1.0.3.1.0.0-78.jar       ... View more

There is no such option do downgrade HDP version out of the box. Also we do not see any HDP 2.7 version released. Also HDP 3.x and HDP 2.6 has major differences in terms of components. Any specific reason you are looking out for downgrade? If this is a freshly build cluster on HDP 3. and you want to use HDP 2.6 then better to freshly install HDP 2.6 which will be lot time and effort saving than manually fixing and downgrading all the components and configs. ... View more

@Manoj690  Are you sure that the NameNode is running on "localhost" (where you are opening the mentioned URL in the browser) ? 1. Can you specify the namenode IP Address/ Hostname in the URL instead of "localhost" ? 2. Can you also check if the NameNode is listening on port 50070 ?  (is that port opened and firewall is disabled) on NameNode host? # netstat -tnlpa | grep 50070 # service iptables stop 3. Please check if you are able to telnet NamerNode host=name & port from the machine where you are running the Browser? # telnet $NAMENODE_HOST 50070 (OR) # mc -v $NAMENODE_HOST 50070 4. Check and share the NameNode log. Usually it can be found inside the " /var/log/hadoop/hdfs/hadoop-hdfs-namenode-xxxxxxxxxxxxxxxxxx.log "     ... View more