Rajeev Rathor questions

Rajeev Rathor answers

• spark streaming + kafka - spark session API
• org.elasticsearch.common.xcontent.DeprecationHandler Exception while using Elasticsearch REST High level client
• java.lang.NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException while connecting Cassandra DB
• HDFS_NAMENODE_USER, HDFS_DATANODE_USER & HDFS_SECONDARYNAMENODE_USER not defined
• log4j2 not working in spring boot application
• Kafka - Could not find a 'KafkaClient' entry in the JAAS configuration java
• Elasticsearch NoNodeAvailableException None of the configured nodes are available
• How to find out if a directory is a valid PostgreSQL cluster
• Getting NullPointerException when running Spark Code in Zeppelin 0.7.1
• Queries with streaming sources must be executed with writeStream.start();