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The block is written to the first DataNode in the list, the local host if possible, with the list of DataNodes that are to be used. On receipt of a block, each DataNode is responsible for initiating the transfer of the block to the next DataNode in the list. This allows writes to HDFS on a machine that hosts a DataNode to be very fast for the application, as they do not require bulk network traffic.

The protect method has another use, in fact, and that is to protect a native method from being overridden Consider the following example: // original method Stringimplement('method', function(){ consolelog('Original'); }protect()); 'hello'method(); // 'Original' // override original Stringimplement('method', function(){ consolelog('Override'); });.

Figure 7-6. Creating a form based on a database schema Exercise 7-1 will walk you through creating a form template based on a SQL Server connection. While the exercise takes a very easy (and appealing) path through creating a databound form, I do not want to mislead you as to the level of effort required to create electronic forms. Any e-forms initiative is going to require heavy analysis of the business uses, common use cases, workflows, data sources, and so on. InfoPath is a very powerful tool, and eases the implementation of an e-forms effort, but that effort still has a high demand for business analysis.

The cluster-level tunable parameters require a cluster restart to take effect. Some of them may require a restart of the HDFS portion of the cluster; others may require a restart of the MapReduce portion of the cluster. These parameters take effect only when the relevant server starts.

Earlier, when we were discussing element modification, we came across a set of element methods called the universal modificators. These three functions set, get, and erase are the three most useful modification functions in MooTools, and their dynamic behavior supports a wide array of uses. As I mentioned earlier, the behavior of these modificator methods is controlled by a special object, Element.Properties. This object is reminiscent of the Class.Mutators object, because like Class.Mutators, Element.Properties is used to store special objects called property objects.

The server-level parameters, shown in Table 6-3, affect basic behavior of the servers. In general, these affect the number of worker threads, which may improve general responsiveness of the servers with an increase in CPU and memory use. The variables are generally configured by setting the values in the conf/hadoop-site.xml file. It is possible to set them via command-line options for the servers, either in the conf/hadoop-env.sh file or by setting environment variables (as is done in conf/hadoop-env.sh). The nofile parameter is not a Hadoop configuration parameter. It is an operating system parameter. For users of the bash shell, it may be set or examined via the command ulimit n [value to set]. Quite often, the operating system-imposed limit is too low, and the administrator must increase that value. The value 64000 is considered a safe minimum for medium-size busy clusters.

When a universal modificator function is called, the first thing it does is to take the passed property argument and use it to search for a property object in the ElementProperties object, like so: ElementProperties[property] If a corresponding property object is found, the universal modificator method will then check if the property object has a method that corresponds to the name of the universal modificator, and if so, it will invoke this function, passing in the arguments it received If no property object is found, or if the property object does not have a method that corresponds to the name of the modificator function, the modificator will default to using an attribute-modifying function Let s clear this up with some examples Here, for instance, are property object definitions for the 'style' option: ElementPropertiesstyle = { set: function(style){ thisstyle.

Caution A number of difficult-to-diagnose failures happen when an application or server is unable to

Note Exercise 7-1 uses the pubs database in SQL Server. If you do not have the pubs database installed,

allocate additional file descriptors. Java application writers are notorious for not closing I/O channels, resulting in massive consumption of file descriptors by the map and reduce tasks..