The best helpful hdfs file system commands (3 of 4)

dus-

hadoop fs -dus PATH

dus reports the sum of the file sizes in aggregate rather than individually.

expunge-

hadoop fs -expunge

Empties the trash. If the trash feature is enabled, when a file is deleted, it is first moved into the temporary Trash/folder. The file will be permanently deleted from the Trash/folder only after user-configurable delay.

get -

hadoop -fs -get [-ignorecrc] [-crc] SRC
LOCASDST

Copies files to the local file system.

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Blue prism is an automation tool useful to execute repetitive tasks without human effort. To learn this tool you need the right material. Provided below quick reference materials to understand detailed elements, architecture and creating new bots. Useful if you are a new learner and trying to enter into automation career.
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Blue Prism resources David chappal PDF book Blue Prism…

Topologies in Apache Storm the concept you need to know

There are two main reasons why Apache Storm is so popular. The number one is it can connect to many sources. The number two is scalable. The other advantage is fault tolerant. That means, guaranteed data processing.
The map-reduce jobs process the data analytics in Hadoop. The topology in Storm is the real data processor. The co-ordination between Nimbus and Supervisor carried by Zookeeper What are topologiesThe jobs in Hadoop are similar to topology. The jobs run as per schedule defined.In Storm, the topology runs forever.A topology consists of many worker processes spread across many machines. A topology is a pre-defined design to get end product using your data.A topology comprises of 2 parts. These are Spout and bolts.The Spout is a funnel for topology Two nodes in StormMaster Node: similar to Hadoop job tracker. It runs on a daemon called Nimbus.Worker Node: It runs on a daemon called Supervisor. The Supervisor listens to the work assigned to each machine.Master NodeNimbus is re…

Three popular RPA tools functional differences

Robotic process automation is growing area and many IT developers across the board started up-skill in this popular area. I have written this post for the benefit of Software developers who are interested in RPA also called Robotic Process Automation.

In my previous post, I have described that total 12 tools are available in the market. Out of those 3 tools are most popular. Those are Automation anywhere, BluePrism and Uipath. Many programmers asked what are the differences between these tools. I have given differences of all these three RPA tools.

BluePrismBlue Prism has taken a simple concept, replicating user activity on the desktop, and made it enterprise strength. The technology is scalable, secure, resilient, and flexible and is supported by a comprehensive methodology, operational framework and provided as packaged software.The technology is developed and deployed within a “corridor of IT governance” and has sophisticated error handling and process modelling capabilities to ensu…

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