Hadoop – HDFS Overview
Hadoop File System was developed using distributed file system design. It is run on commodity hardware. Unlike other distributed systems, HDFS is highly faulttolerant and designed using low-cost hardware. HDFS…
Hadoop – Enviornment Setup
Hadoop is supported by GNU/Linux platform and its flavors. Therefore, we have to install a Linux operating system for setting up Hadoop environment. In case you have an OS other…
Hadoop – Introduction
Hadoop is an Apache open source framework written in java that allows distributed processing of large datasets across clusters of computers using simple programming models. The Hadoop framework application works…
Hadoop – Big Data Solutions
Traditional Approach In this approach, an enterprise will have a computer to store and process big data. For storage purpose, the programmers will take the help of their choice of…
Hadoop – Big Data Overview
Hadoop is an open-source framework that allows to store and process big data in a distributed environment across clusters of computers using simple programming models. It is designed to scale…
ETL Testing – Interview Questions
What do you understand by an ETL?Explain the 3-layer architecture of an ETL cycle.What is the difference between and ETL and BI tools?What are the popular ETL tools available in…
ETL Testing – Best Practices
To test a data warehouse system or a BI application, one needs to have a data-centric approach. ETL Testing best practices help to minimize the cost and time to perform…
ETL Testing – Automation
ETL testing is mostly done using SQL scripts and gathering the data in spreadsheets. This approach to perform ETL testing is very slow and time-consuming, error-prone, and is performed on…
ETL Testing – Data Completeness & Backup Recovery
Checking Data Completeness is done to verify that the data in the target system is as per expectation after loading. The common tests that can be performed for this are…
ETL Testing – Data Transformations & Data Quality
Performing data transformations is a bit complex, as it cannot be achieved by writing a single SQL query and then comparing the output with the target. For ETL Testing Data…
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