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The Optimum Method to Concatenate Strings in Java

Recently I was asked this question – Is it bad for performance to use the + operator to concatenate Strings in Java? This got me thinking about the different ways in Java to concatenate Strings and how they would all perform against each other. These are the methods I’m going to investigate:           Using the + operator Using ...

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MySQL as Kubernetes Service, Access from WildFly Pod

Java EE 7 and WildFly on Kubernetes using Vagrant (Tech Tip #71) explained how to run a trivial Java EE 7 application on WildFly hosted using Kubernetes and Docker. The Java EE 7 application was the hands-on lab that have been delivered around the world. It uses an in-memory database that is bundled with WildFly and allows to understand the ...

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“NoSQL Injection” – What 40000 Unsecured MongoDB Databases Mean for our Industry

The news is all over reddit… Major security alert as 40,000 MongoDB databases left unsecured on the internet Security is a feature that is often neglected until it’s too late. And when it’s too late, it is often hard to bake it into a well-established architecture without major refactoring efforts. Every system and thus also every database is always vulnerable. ...

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How to: Refine Hive ZooKeeper Lock Manager Implementation

Hive has been using ZooKeeper as distributed lock manager to support concurrency in HiveServer2. The ZooKeeper-based lock manager works fine in a small scale environment. However, as more and more users move to HiveServer2 from HiveServer and start to create a large number of concurrent sessions, problems can arise. The major problem is that the number of open connections between ...

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10 SQL Articles Everyone Must Read

We’ve been blogging about Java and SQL for a while now, on the jOOQ blog. Over the years, while researching interesting blog topics, we’ve discovered a lot of SQL gems in the blogosphere that have inspired our work and our passion for SQL. Today, we’re presenting to you a list of 10 articles that we think you should absolutely read. ...

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How to Analyze Highly Dynamic Datasets with Apache Drill

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Today’s data is dynamic and application-driven. The growth of a new era of business applications driven by industry trends such as web/social/mobile/IOT are generating datasets with new data types and new data models. These applications are iterative, and the associated data models typically are semi-structured, schema-less and constantly evolving. Semi-structured where an element can be complex/nested, and schema-less with its ...

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