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Instead, documentid performs the object operation, which calls the toElement method of the obj The div element returned by the method is then processed through the element operation to turn it into a proper element, before returning it from documentid This special feature makes it possible for us to create types and classes that can be used with documentid: var Widget = new Class({ initialize: function(element){ thiselement = element; }, toElement: function(){ return thiselement;.

The hadoop-env.sh script has a section for providing custom JVM parameters for the different Hadoop Core servers, including the JobTracker and TaskTrackers. As of Hadoop 0.19.0, the classpath settings are global for all servers. The hadoop-env.sh file may be modified and distributed to the machines in the cluster, or the environment variable HADOOP_JOBTRACKER_OPTS may be set with JVM options before starting the cluster via the bin/start-all.sh command or bin/start-mapred.sh command. The environment variable HADOOP_TASKTRACKER_OPTS may be set to provide per TaskTracker JVM options. It is much better to modify the file, as the changes are persistent and stored in a single Hadoop-specific location. When starting the TaskTrackers via the start-*.sh scripts, the environment variable HADOOP_TASKTRACKER_OPTS may be set in the hadoop-env.sh file in the MapReduce conf directory on the TaskTracker nodes, or the value may be set in the login shell environment so that the value is present in the environment of commands started via ssh. The start-*.sh scripts will ssh to each target machine, and then run the bin/hadoop-daemon.sh start tasktracker command.

The DistributedCache object provides a programmatic mechanism for specifying the resources needed by the mapper and reducer. The job is actually already using the DistributedCache object to a limited degree, if the job creates the JobConf object with a class as an argument: new JobConf(MyMapper.class). You may also invoke your MapReduce program using the bin/hadoop script and provide arguments for -libjars, -files, or -archives. The downloadable code for this book (available from this book s details page on the Apress web site, http://www.apress.com) includes several source files for the DistributedCache examples: Utils.java, DistributedCacheExample.java, and DistributedCacheMapper.java.

Learn how to use design patterns. A design pattern is a particular idiom that dictates how to create common types of classes. While design patterns in general are beyond the scope of this book, you ll see several patterns used throughout the framework and I ll call your attention to them. As part of your study, read up on the common design patterns that you can use for your programs.

Figure 5-17. Promoting form columns into the form library 12. The next page simply summarizes the actions for the Publishing wizard. Click the Publish button at the bottom. 13. The final page offers you the option to e-mail the form template to e-mail recipients, or to open the form library. Selecting Send the form to e-mail recipients opens the form template in an e-mail, similar to publishing via e-mail, covered earlier. Click Done and you re finished.

Caution The paths and URIs for DistributedCache items are stored as comma-separated lists of strings in the configuration. Any comma characters in the paths will result in unpredictable and incorrect behavior.

But perhaps the best advice I can give is to never stop learning. Read books about object-oriented programming and classical languages. Check out the code for the classes included in MooTools Core. The best way to learn the MooTools class system is to experiment and observe how MooTools does things. In fact, that s exactly what we ll do in the chapters ahead: we re going to look at the internals of core MooTools classes. I can assure you that a lot more amazing things can be done using the features that MooTools and the JavaScript language itself provides.