hadoopinterviewquestion

Lazy evaluation in Spark means that the execution will not start until an action is triggered. The Spark Lazy evaluation, users can divide into smaller operations. It reduces the number of passes on data by transformation grouping operation. By lazy evaluation in Spark to saves the trip between driver and cluster, speed up the process. […]

Start Hive Metastore Create Database SHOW DATABASES Use Database Describe Database Drop Database Hive DDL Table Commands Show Tables Describe Table Truncate Table Alter Table Drop Table Internal Tables External Table Hive – Load Data Into Table In hive with DML statements, we can add data to the Hive table in 2 different ways. Using INSERT […]

Updated: Dec 12, 2018 #hadoop #sqoop #defaultmapper #defaultreducer #hadoopinterviewquestion In this post we are going to focus the default number of mappers and reducers in the sqoop. scope is the part of Hadoop ecosystem which is mainly useful to move the data from the RDBMS database to hdfs file system or to directly hive tables and […]