By Mohammad Kamrul Islam, Aravind Srinivasan
Get a pretty good grounding in Apache Oozie, the workflow scheduler method for handling Hadoop jobs. With this hands-on consultant, skilled Hadoop practitioners stroll you thru the intricacies of this robust and versatile platform, with quite a few examples and real-world use cases.
Once you put up your Oozie server, you’ll dive into options for writing and coordinating workflows, and how you can write advanced info pipelines. complex themes assist you to deal with shared libraries in Oozie, in addition to the best way to enforce and deal with Oozie’s protection capabilities.
- set up and configure an Oozie server, and get an summary of easy concepts
- trip throughout the international of writing and configuring workflows
- find out how the Oozie coordinator schedules and executes workflows in accordance with triggers
- know how Oozie manages facts dependencies
- Use Oozie bundles to package deal a number of coordinator apps right into a info pipeline
- find out about safety features and shared library management
- enforce customized extensions and write your personal EL features and actions
- Debug workflows and deal with Oozie’s operational information
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Since Java SE forms the backbone to many products across several industries—and OSGi in many ways influences and modifies the underlying operation of the JVM—incorporating OSGi into Java SE is not as simple as incorporating a niche JSR. Like most processes involving technology standards, a standard making its way into a product will depend heavily not just on being a best-of-breed technology, but also on a mix of business interests, corporate politics, and when the user community acknowledges its pressing need.
A service might be the only thing being updated, but if other bundles have type dependencies on this same updated bundle, OSGi ensures changes are propagated to all dependent bundles by uninstalling and reinstalling each one. This is not the case with services, since services are always consulted via OSGi’s registry. If a bundle only contains services and is updated, there is no need to propagate updates to bundles using this service; the OSGi registry will ensure all consuming bundles obtain a reference to the updated service the next time it is accessed.
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