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Mohammad Kamrul Islam, Aravind Srinivasan's Apache Oozie: The Workflow Scheduler for Hadoop PDF

By Mohammad Kamrul Islam, Aravind Srinivasan

Get an excellent grounding in Apache Oozie, the workflow scheduler approach for handling Hadoop jobs. With this hands-on advisor, skilled Hadoop practitioners stroll you thru the intricacies of this strong and versatile platform, with quite a few examples and real-world use cases.

Once you put up your Oozie server, you’ll dive into ideas for writing and coordinating workflows, and write advanced information pipelines. complicated subject matters enable you deal with shared libraries in Oozie, in addition to find out how to enforce and deal with Oozie’s safeguard capabilities.
- set up and configure an Oozie server, and get an outline of easy concepts
- trip during the international of writing and configuring workflows
- learn the way the Oozie coordinator schedules and executes workflows in accordance with triggers
- know the way Oozie manages info dependencies
- Use Oozie bundles to package deal numerous coordinator apps right into a information pipeline
- know about security measures and shared library management
- enforce customized extensions and write your personal EL services and actions
- Debug workflows and deal with Oozie’s operational info

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Correct “Ends” force us as programmers to put the appropriate “Endxx” at the end of a set of logic. It’s a small thing, but program clarity is improved. Listing 4-4 illustrates the use of If, Else, Elseif, and Endif operations in free format. If A = B; FieldA = FieldB; Else; FieldA = *Zero; Endif; // Simple If, Else, and Endif // An If, Elseif, Else, and Endif group If Option = 'A' and (Type = 3 or Company = 73); Value = 1; Elseif Option = 'B' and (Type = 3 or Company = 75); Value = 2; Elseif Option = 'C' and (Type = 1 or Company = 99); Value = 3; Else; Value = 4; Endif; Listing 4-4: Examples of If, Elseif, Else, and Endif Chapter 4: Introducing Free-Format RPG IV • 37 Controlled Looping Controlled looping is another common function in RPG, and IBM made some changes for free format in RPG IV.

In the calculations, the %Kds built-in function is used on the Chain, Set, or similar operation. This function has two parameters: the named data structure mentioned above and an optional constant that specifies how many key fields to use from the data structure in the operation. If omitted, the second parameter defaults to all key fields. The second method available is the inline composite argument list, provided on the calculation operation line. You specify fields in a parameter-style list, and, together, these fields comprise the lookup key argument.

You can use a partial key in the key argument list as well. This combination can provide a valuable utility if the file being accessed has a multiple-field key. For example, say you have an “on-order” file with a two-part key: customer number and order number. To determine whether a certain customer has one or more data records in the file, you need only code a Setll to the file, using the customer number as the argument, and then check the status of %Equal after the Setll. If the function returns '1', data exists for the customer, and the file pointer is positioned at the first record.

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