hadoop Interview Question

Var keyword is just similar to variable declaration in Java whereas Val is little different. Once a variable is declared using Val the reference cannot be changed to point to another reference. This functionality of Val keyword in Scala can be related to the functionality of java final keyword. Val refers to immutable declaration of […]

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. […]

Hive Partitions Create Hive Partition Table Create non-partition table Load data to non-partition table Set the Hive property Load data from non-partition to partition table Show All Partitions on Hive Table Add New Partition to the Hive Table Rename or Update Hive Partition Manually Renaming Partitions on HDFS When you manually modify the partitions directly […]