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status of files in a directory is made. For large directories, this can be a considerable amount of data. With many threads servicing requests, the amount of memory used by in transit serialized requests may be very large. I have worked with a cluster where this transitory memory requirement exceeded 1GB.

Hadoop Core s ipc.server.listen.queue.size parameter sets the listen depth for accepting connections. This value is the number of outstanding, unserviced connection requests allowed by the operating system, before connections are refused. Its default value is 128. Many operating systems have hard and small limits for this value. If your thread counts are lower, this value will need to be higher, to prevent refused connections. If you find connection-refused errors in your log files, you may want to increase the value of this parameter.

console.log('Calling ' + name); this.busy = true; (function(){ console.log('End call to ' + name); this.busy = false; this.callChain(); }).delay(5000, this); return this; } }); var phone = new Phone(); phone.call('Tim'); phone.call('Chris'); In this snippet we modified our delayed function to invoke callChain after it has set the busy property back to false. What happens now is that when callChain is invoked, it checks whether there were previous calls saved in the queue, and calls the first of these saved calls. The result is that all our function calls are now queued. As I mentioned, the Chain mixin is used prominently in asynchronous MooTools classes, like Request and Fx. We ll take a look at how these classes use the Chain mixin later, but now we ll move on to another class that s used heavily in MooTools.

Hadoop Core historically has not handled out-of-disk-space exceptions gracefully As a method for preventing out-of-disk conditions, Hadoop Core provides four parameters: two for HDFS and two for MapReduce It is common, especially in smaller clusters, for a DataNode and a TaskTracker to reside on each computer node in the cluster It is also common for the TaskTracker s temporary storage to be stored in the same file system as the HDFS data blocks With HDFS, blocks written by an application that is running on the same machine as a DataNode will have one replica placed on that DataNode It is very easy for a task to fill up the disk space on a partition and cause HDFS failures, or for HDFS to fill up a partition and result in task failures Tuning the disk space reservation parameters will minimize these failures You can adjust the following parameters: mapredlocaldir.

Full trust: Full trust forms are as the name implies fully trusted. They can run any managed code, cross domain boundaries with data connections, and so on. However, since this is a significant security risk, fully trusted forms must either be digitally signed by the designer, installed with an MSI installer, or be part of the .NET code group indicating full trust on the assembly. Full trust forms published to a SharePoint location must be activated by an administrator at the local console before they can be used.

The Events mixin is used to add callback functionality to classes. An event, to define it very generally, is something interesting that happens, and classes can use the Events mixin to tell other parts of a program that something interesting has happened. Reusing our previous Phone example, let s say we want to make our class more flexible by separating the logical and presentational parts of it. The logical part of the class deals with how the class actually works in terms of changes in state and data, while the presentational parts deal with how these changes are shown to the user. The toggling of the busy status of the class is logical, while the logging of the name is presentational. With this in mind, let s split up our class into several parts: var Caller = new Class({ busy: false, call: function(name){ this.busy = true; (function(){ this.busy = false; }).delay(5000, this); return this; } });