By Mohammad Kamrul Islam, Aravind Srinivasan
Get a great grounding in Apache Oozie, the workflow scheduler approach for dealing with Hadoop jobs. With this hands-on advisor, skilled Hadoop practitioners stroll you thru the intricacies of this robust and versatile platform, with various examples and real-world use cases.
Once you put up your Oozie server, you’ll dive into thoughts for writing and coordinating workflows, and how you can write complicated info pipelines. complex themes assist you deal with shared libraries in Oozie, in addition to find out how to enforce and deal with Oozie’s safety capabilities.
- set up and configure an Oozie server, and get an outline of easy concepts
- trip throughout the international of writing and configuring workflows
- find out how the Oozie coordinator schedules and executes workflows in response to triggers
- know the way Oozie manages information dependencies
- Use Oozie bundles to package deal numerous coordinator apps right into a information pipeline
- find out about safety features and shared library management
- enforce customized extensions and write your personal EL capabilities and actions
- Debug workflows and deal with Oozie’s operational info
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Extra info for Apache Oozie: The Workflow Scheduler for Hadoop
Let's look at the following Playground; it shows us how to define Optional and shows what happens if we assign a nil value to a Non-Optional variable: Notice the error we receive when we try to assign a nil value to the non-optional variable. This error message tells us that the stringTwo variable does not conform to the NilLiteralConvertible protocol. When we see this error, remember that it means that we are assigning a nil value to a variable or constant that is not defined as an optional type.
Let's take a look at what type inference is. [ 30 ] Chapter 2 Type inference Type inference allows us to omit the variable type when we define it. The compiler will infer the type, based on the initial value. For example, in Objective-C, we would define an integer like this: int myInt = 1 This tells the compiler that the myInt variable is of the Int type, and the initial value is the number 1. In Swift, we would define the same integer like this: var myInt = 1 Swift infers that the variable type is an integer because the initial value is an integer.
The substringToIndex() function create a substring from the beginning of the string to the index. The substringFromIndex() function create a substring from the index to the end of the string. We then used the last property to get the last character of the string and the first property to get the first character. We can retrieve the number of characters in a string by using the count property. count [ 40 ] Chapter 2 This completes our whirlwind tour of strings. I know we went through these properties and functions very quickly, but we will be using strings extensively throughout this book, so we will have a lot of time to get used to them.
Apache Oozie: The Workflow Scheduler for Hadoop by Mohammad Kamrul Islam, Aravind Srinivasan