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Hibernate 3 Type integer long short float double character byte boolean, yes_no, true_false Corresponding Java Type int, java.lang.Integer long, java.lang.Long short, java.lang.Short float, java.lang.Float double, java.lang.Double char, java.lang.Character byte, java.lang.Byte boolean, java.lang.Boolean

As you can see, HTML5 Canvas is supported in all the browsers except Internet Explorer. If you want to use canvas in Internet Explorer, you can use the open-source project explorercanvas (http://code.google.com/p/explorercanvas). To use explorercanvas, you just need to check if Internet

The previous section dealt with the common and highly visible failure cases of a server process crashing or the machine hosting a server process failing. This section will cover how you can determine what has happened when the failure is less visible or why a server process is crashing. There are a number of failures that can trip up an HDFS administrator or a MapReduce programmer. In the current state of development, it is not always clear from Hadoop s behavior or log messages what the failure or solution is. The usual first indication that something

is in need of maintenance is a complaint from users that their jobs are performing poorly or failing, or a page from your installation monitoring tool such as Nagios.

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When you access a web page that uses the HTML5 Geolocation APIs, the privacy protection mechanism should kick in. Figure 4-2 shows what this looks like in Firefox 3.5.

Hibernate 3 Type string date, time, timestamp calendar, calendar_date big_decimal big_integer locale timezone currency class binary text serializable Corresponding Java Type java.lang.String java.util.Date java.util.Calendar java.math.BigDecimal java.math.BigInteger java.util.Locale java.util.TimeZone java.util.Currency java.lang.Class byte[] java.lang.String java.io.Serializable

The NameNode is the weak point in the highly available HDFS cluster. As noted earlier, currently there are no high-availability solutions for the NameNode. The NameNode has been designed to keep multiple copies of critical data on the local machine and close in time replicas on auxiliary machines. Let s examine how it can fail.

The NameNode keeps all of the metadata for the file system in memory to speed request services. The NameNode also serializes directory listings before sending the result to requesting applications. The memory requirements grow with the number of files and the total number of blocks in the file system. If your file system has directories with many entries and applications are scanning the directory, this can cause a large transient increase in the memory requirements for the name server. I once had a cluster that was using the Filesystem in Userspace (FUSE) contrib package to export HDFS as a read-only file system on a machine, which re-exported that file system via the Common Internet File System (CIFS) to a Windows server machine. The access patterns triggered repeated out-of-memory exceptions on the NameNode. (Using FUSE is discussed in 8.) If the DataNodes are unreliable, and they are dropping out of service and then returning to service after a gap, the NameNode will build a large queue of blocks with invalid states. This may consume very large amounts of memory if large numbers of blocks become transitorily unavailable. For this problem, addressing the DataNode reliability is the only real solution, but increasing the memory size on the NameNode can help. There are three solutions for NameNode out-of-memory problems: Increase the memory available to the NameNode, and ensure the machine has sufficient real memory to support this increase. Ensure that no directory has a large number of entries. Alter application access patterns so that there are not large numbers of directory listings.

Figure 4-2. The notification bar is triggered in Firefox when the HTML5 Geolocation APIs are used The mechanism is triggered when the HTML5 Geolocation code is executed. Simply adding HTML5 Geolocation code that is not called anywhere (as, for example, in an onload method) does not do anything. If, however, the HTML5 Geolocation code is executed, for example, in a call to navigator.geolocation.getCurrentPosition (explained in more detail later on), the user is prompted to share their location with the application. Figure 4-3 shows what happens on Safari, running on an iPhone.

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