@yukti    As you have already got the 3.1.0.0-78 version of JARs so for the missing class "org.apache.hadoop.hive.kafka.KafkaSerDe" can you try using the following JAR (instead of "hive-serde-0.10.0.jar'")?   In My HDP 3 installation on hive host i can see it here " usr/hdp/current/hive-server2/lib/kafka-handler-3.1.0.3.1.0.0-78.jar" # /usr/jdk64/jdk1.8.0_112/bin/javap -cp /usr/hdp/current/hive-server2/lib/kafka-handler-3.1.0.3.1.0.0-78.jar org.apache.hadoop.hive.kafka.KafkaSerDe Compiled from "KafkaSerDe.java" public class org.apache.hadoop.hive.kafka.KafkaSerDe extends org.apache.hadoop.hive.serde2.AbstractSerDe { public org.apache.hadoop.hive.kafka.KafkaSerDe(); public void initialize(org.apache.hadoop.conf.Configuration, java.util.Properties) throws org.apache.hadoop.hive.serde2.SerDeException; public java.lang.Class<? extends org.apache.hadoop.io.Writable> getSerializedClass(); public org.apache.hadoop.io.Writable serialize(java.lang.Object, org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector) throws org.apache.hadoop.hive.serde2.SerDeException; public org.apache.hadoop.hive.serde2.SerDeStats getSerDeStats(); public java.lang.Object deserialize(org.apache.hadoop.io.Writable) throws org.apache.hadoop.hive.serde2.SerDeException; java.util.ArrayList<java.lang.Object> deserializeKWritable(org.apache.hadoop.hive.kafka.KafkaWritable) throws org.apache.hadoop.hive.serde2.SerDeException; public org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector getObjectInspector(); static {}; }     ... 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