pySpark becomes a popular choice for many data engineers and becomes the mainstream technology for big data and machine learning projects. pySpark is not a programming language. It is a wrapper (or abstraction) to help python developers to write spark code. Apache Spark is developed in Scala (a functional Programming Language) and to make Apache Spark more accessible to the … read the rest

Chef Windows Installing Roles

While using Chef for Windows, there are multiple backends for the Windows feature resourceDISM and servermanagercmd. Each one has a specific Ruby class that will be used based on the determined backend as follows:

  • Chef::Provider::WindowsFeature::DISM: This uses DISM to manage roles/features (default unless DISM is not present)
  • Chef::Provider::WindowsFeature::ServerManagerCmd: This uses Server Manager to manage roles/features (the fallback
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Windows Resources for Chef

When managing Windows with Chef, there are some Windows-specific resources that are available to you as part of the Windows stack. This section covers those resources that are specific to Windows such as the Windows Registry, roles, MSIs, and so on; the ones that won’t be available on Linux systems.

Working with Windows-specific resources

Most systems administrators, managing Windows means … read the rest

OCJP Practice Papers – Java Class Design

OCJP Practice Papers – Java Class Design include following topics

  • Implement encapsulation
  • Implement inheritance including visibility modifiers and composition
  • Implement polymorphism
  • Override hashCode, equals, and toString methods from Object class
  • Create and use singleton classes and immutable classes
  • Develop code that uses static keyword on initialize blocks, variables, methods, and classes

See the complete syllabus for OCJP here

Sample Questions

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