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

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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

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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

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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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Writing Groovy’s groovy.util.slurpersupport.GPathResult (XmlSlurper) Content as XML

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In a previous blog post, I described using XmlNodePrinter to present XML parsed with XmlParser in a nice format to standard output, as a Java String, and in a new file. Because XmlNodePrinter works with groovy.util.Node instances, it works well with XmlParser, but doesn’t work so well with XmlSlurper because XmlSlurper deals with instances of groovy.util.slurpersupport.GPathResult rather than instances of ...

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Hadoop and the OpenDataPlatform

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Pivotal, IBM and Hortonworks announced today the “Open Data Platform” (ODP) – an attempt to standardize Hadoop. This move seems to be backed up by IBM, Teradata and others that appear as sponsors on the initiative site. This move has a lot of potential and a few possible downsides. ODP promises standardization – Cloudera’s Mike Olson downplays the importance of this ...

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Multi-Tier Architecture Tutorial using Docker

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Background While there are many very good Docker tutorials currently available, I found that many are either too simplistic in the scenarios offered, or in some cases, too complex for my liking. Thus, I decided to write my own tutorial that describes a multi-tier architecture configured using Docker. Prerequisites This tutorial assumes that you have successfully installed Git and Docker. ...

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Android Text to Speech (TTS)

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This post describes how to use text to speech (TTS) in Android. It isn’t so common to find a post explaining how to use it and it is a part of Android not much covered. In my opinion, TTS is very interesting because it can add some nice features to an app. Text to Speech is a feature of Android ...

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