2020

Apache NIFI Retry & Wait in custom processor

Objective: Identify the regions in India where crime rate is emerging?

2019

GraphQL SPQR- how to access the native ServletRequest and Response

Enhancing GraphQL APIs with GraphQL SPQR and Servlet Integration

2018

This post attempts to share the common issues that data engineer face while writing Spark in Java and how to solve those issues. Writing Spark in Java isn’t fun and my preference is always Scala but there can be situations when you don’t have luxyary to choose language of your preference.

2017

Introduction to jshell/REPL and how to launch inline command in jshell from shell

Pellucid tutorial using java modules, REPL(READ EVALUATE Print Loop) jshell and how to launch jshell inline command from shell
Jdk-9 is one of the major shift for java developers, it has so many powerful tools and jshell is one of them. Jshell shall be used to run small commands, utilities, expressions, tough it helps to avoid developing many standalone utilities but it shouldn’t be used to run java classes directly.

Spark Dataset Operations in java

Guide to Setting Up a Spark Project and Exploring Basic Spark Dataset Operations

Mapr Certified Spark Developer (MCSD) guide

2016

Apache Beam Spark Runner example using Maven

2015

hive hadoop jar files conflicts for custom UDF/Serde

## Hive hadoop jar files conflicts for custom UDF and Serde

Hive NoClassDefFoundError auxiliary path issue

Hive NoClassDefFoundError error auxiliary path issue

Solrcloud 4 inconsistent results count-commitwithinms issue

Solrcloud 4 inconsistent results count-commitwithinms issue:

Solr Multithreaded concurrent atomic updates problem.

Solr Multithreaded concurrent atomic updates problem:

Getting Started with Raspberry Pi 2 mod B

Getting Started with Raspberry Pi 2 mod B is a small guide that answers all your basic queries

A brief introduction of Raspberry pi 2 mod B

Raspberry pi or its latest version pi 2 mod B is a (I would not say cheap) low cost, credit card sized computer. Pi can plug into your computer monitor or TV set and uses a standard keyboard and mouse (wired or Wireless). It is capable of delivering everything that is expected from a desktop computer, from programming, gaming, internet browsing, playing HD videos and a lot more.

Handling Asynchronous request in LoadRunner

It is now easy to handle asynchronous request in loadrunner. I am not going to start with differentiating synchronous and asynchronous request here, as I suppose if you are here you already know the difference.

Lanuch Hbase Mapreduce Job

Launching an HBase MapReduce Job with Custom JARs

Java Example for Hbase Columns witandh Column Families Operations

Exploring Hbase Column Qualifiers with Column Families Using MapReduce

2014

LoadRunner and Internet Explorer compatibility matrix

Below is the LoadRunner and Internet Explorer compatibility matrix -

why there is difference between values of average response time in Summary Report and Average transaction response time graph

Sometimes it is confusing, when we observe the difference in Avg, max and min values of response time in “Summary report” and values in “Average transaction response time” graph.

Pagination with Hbase

HBase Pagination for Both Forward and Backward Navigation

Hbase tips and tricks

Hbase tips and tricks: Maximizing Performance and Efficiency

Extract XSD from WSDL in Java

## Extract XSD from WSDL in Java

Hbase mulitple operations with bash script

## Automating HBase Operations with Bash Scripts

Matrices Sum using awk

Below program can provide sum of any number of matrices of any degree.

UNIX: Zombie processes

Unix zombie processes

In this part I am going to answer below questions regarding zombie process

Matrix operations in Mapreduce

Configure and install Hue

Configure and install Hue-

Hive Query Over Hbase

Indexing Using Map Reduce

Generate indexing using map reduce can’t be done in distributed mode of mapreduce as each line number is sequential and unique. To achieve this I tried to generate index using single reducer job.

Loadrunner Correlation of dynamic boundary

Difference between Socket level and Wininet level data in Loadrunner

Error during code generation and The Vuser script was not generated in Loadrunner

Sometime, LoadRunner captures all events during recording but throws an Error during script generation - “Error during code generation. The Vuser script was not generated.”

Error HTTP Status Code 401 Unauthorized during script replay

There are lot of common errors that we keep encountering while using Loadrunner, like HTTP status code 401, 500, 403 etc.

How to create and validate a pdf download script in LoadRunner

Saving a file to the local machine during recording of a pdf download script in loadrunner VUgen, by clicking on”save as” button, is a client side activity and does not get recorded. But the action on web page which results the file download box gets recorded in VUgen and actually downloads the file (pdf file/Zip file).

strtok - Capture a sub string or data from a string based on delimiters in Loadrunner

There is an inbuilt function in loadrunner that can be used to capture data from string by specifying delimiters. strtok function can be used to do the trick -

LoadRunner Correlation

Loadrunner : Error -26601: Decompression function wgzMemDecompressBuffer failed, return code=-5 (Z_BUF_ERROR), inSize=0, inUse=0, outUse=0

The “error -26601: Decompression function wgzMemDecompressBuffer failed, return code=-5 (Z_BUF_ERROR), inSize=0, inUse=0, outUse=0” in loadrunner occurs because of insufficient buffer size set in the runtime settings. The Network buffer size is set to 12288 bytes, by default.