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birt ean 128,
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The TaskTracker picks a map runner class based on the content of the key mapred maprunnerclass Its choices are the standard MapRunner, which runs a single thread; the MultithreadedMapRunner, which runs mapredmapmultithreadedrunnerthreads (the default is ten threads); or the chain mapper A child JVM is allocated to run the mapper class, and the map task is started The output data of the map task is partitioned and sorted by the output partitioner class and the output comparator class, and aggregated by the combiner class, if one is present The result of this will be N sequence files on disk: one for each reduce task, or one file if there is no reduce task Each time the map method is called, an output record is emitted, or the reporter object is interacted with, a heartbeat timer is reset.

Figure 7-5. The data structure for a form designed from an XML file As described in 3, your options for a main data source are a database connection, web service, or XML schema. When you define a form based on a database connection or web service, the data source is locked into the form you cannot edit it in the data source task pane.

This, of course, isn t perfect and is easily bypassed by cunning manipulation of code The code typeOf({length: 1, callee: 1}), for example, will return arguments even if what you have is not really an argument object Unfortunately, there s nothing we can do about this, since duck typing is the only other solution we can use for values with no corresponding type objects Thankfully, though, we can use the idea of duck typing to craft code that doesn t rely entirely on the specificity of type to do its job Take note that family methods take precedence in the typing process for typeOf Duck typing is a fallback technique used only for objects with no corresponding type objects And if these two techniques don t work, the typeof operator is used by the typeOf function as a last resort..

The heartbeat timeout is stored in the configuration under the key mapredtasktrackerexpiryinterval, and has a default value of 600,000 milliseconds (msec), or 10 minutes If this timeout expires, the map task is considered hung and terminated If a terminated task has not failed more than the allowed number of times, it is rescheduled to a different task execution slot A failing task may have a debugging script invoked on it if the value of the configuration key mapredmaptaskdebugscript is the path to an executable program The script is invoked with the additional arguments of the paths to the stdout, stderr, and syslog output files for the task See this book s appendix, which covers the JobConf object, for details on how to configure a debugging script for failing tasks.

When a task finishes, the output commit class is launched on the task output directory, to decide which files are to be discarded and which files are to be committed for the next step The class name is stored in the configuration under the key mapredoutputcommitterclass and has the default class FileOutputCommitter If less than the required number of tasks succeed, the job is failed and the intermediate output is deleted The TaskTracker will inform the JobTracker of the task s success and output locations..

Up to this point we ve been talking about type objects in the context of type detection. But as I said earlier in this chapter, a type object also acts as the representative for its instances. Like classes, type objects are abstracted constructor-prototype pairs that can be used to change the structure and behavior of the items of that type. In fact, both classes and type object share very similar methods to accomplish this, as we ll see later on. And just like classes, type objects also have a special set of methods available only to them that can be used to streamline the process of working with types.