Hadoop Tutorial – The Hadoop Distributed File System (HDFS)


The Hadoop Distributed File System (HDFS) is one of the key services for Hadoop. HDFS is a distributed file system that abstracts each individual hard disk file system form a specific node. With HDFS, you get a virtual file system that spans over several nodes and allows you to store large amounts of data. HDFS can also operate in a non-distributed way as a standalone system but the purpose of it is to serve as a distributed file system. One of the nice things about HDFS is that it runs on almost any hardware – which gives us the possibility to integrate existing systems into Hadoop. HDFS is also fault tolerant, reliable, scalable and easy to extend – just like any other Hadoop project! HDFS works with the assumption that failures do happen – and is built to work fault-tolerant. HDFS is built to reboot in case of failures. Recovery is also easy with HDFS. As streaming is a major

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Software defined Storage (SdS) in the Cloud


Cloud Computing gave us several changes in how we handle IT nowadays. Common tasks that used to take a lot of time received great automation and much more is still about to come. Another interesting development is the “Software defined X”. This basically means that infrastructure elements receive larger automation as well, which ends up being more scale able and better to utilize from applications. A frequent term used lately is the “Software defined Networking” approach, however, there is another one that sounds promising, especially for Cloud Computing and Big Data: Software defined Storage. Software defined Storage gives us the promise to abstract the way how we use storage. This is especially useful for large scale systems, as no one really wants to care about how to distribute the content to different servers. This should basically be opaque to end-users (software developers). For instance, if you are using a storage system for your website, you want to have an API

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