Creating a Hadoop Docker Image
Apache Hadoop is a core big data technology. Running Hadoop on Docker is a great way to get up and running quickly. Below are the basic steps to create a…
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January 25, 2021
How to Change Hadoop Output Delimiter
Hadoop’s default output delimiter (character separating the output key and value) is a tab ("\t"). This post explains how to change the default Hadoop output delimiter. Output Delimiter Configuration Property…
January 25, 2021
How to Create a Disk Based List in Java
Occasionally when programming in Java you will need a List too large to hold in memory. MapDB is an open source Java library that allows you to create a disk…
January 25, 2021
How to Create a Disk Based Map in Java
Occasionally when programming in Java you will need a Map too large to hold in memory. MapDB is an open source Java library that allows you to create a disk…
January 25, 2021
How to Uppercase/Lowercase Text in Unix/Linux
Uppercasing and lowercasing is a common task when working with text. Below are examples of doing this with standard Linux/Unix utilities. Lowercasing text with tr tr 'A-Z' 'a-z' Uppercasing text…
January 25, 2021
Introduction to Java Streams
What are Java Streams? A Java stream is a sequence of elements of a specific type that are consumed from a source like Collections, arrays, or I/O resources. Streams are…
January 25, 2021
How to Uppercase/Lowercase text with sed
sed is a common Linux/Unix utility used to parse and transform text. Below are examples of uppercasing and lowercasing text with sed: Uppercasing Text with sed sed 's/[a-z]/\U&/g' [a-z] is…
January 25, 2021