Cloudera Impala provides an interface for executing SQL queries on data(Big Data) stored in HDFS or HBase in a fast and interactive way. Impala improves the performance of an SQL query by applying various optimization techniques. “Compute Stats” is one Read more
Sometimes, we come across a situation where we may need to update the last modified time of a file in HDFS. We can achieve it using Hadoop FileSystem API in Java. Step 1: Create a simple maven project in Eclipse. Read more
“Hello World..!” – Probably the first message that any developer tries to print on the console, while learning a new programming language. Let’s write a basic Java program to print “Hello World..!” message on the console and go through each Read more
Below are the basic UNIX commands that we use, while working in UNIX environment. UNIX commands are case sensitive. Listing of Files “ls” command Usage: ls [<options>] [<input_path>] ls <input-path-of-file-or-directory> Lists all the file names in a given directory Read more