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For a 32-bit JVM, the maximum memory size is about 2.5GB, which will support a small HDFS cluster with a under a million files and blocks. As a general rule, pin the full memory allocation by setting the starting heap size for the JVM to the maximum heap size.

In addition to these standard types, you can create your own. Your user-type class should implement the org.hibernate.foo.UserType or the org.hibernate.foo.CompositeUserType interfaces. Once implemented, a custom type can behave identically to the standard types, though depending on your requirements it may be necessary to specify multiple column names to contain its values, or to provide initialization parameters for your implementation. For one-off cases, we recommend that you use a component, which has nearly identical semantics. Unless you propose to make substantial use of a custom type throughout your application, it will not be worth the effort. We do not discuss this feature further in this text.

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Ideally, the underlying disk storage used for the NameNode s file system image (dfs.name.dir) and edit log (dfs.name.edits.dir) should be a highly reliable storage system such as a RAID 1 or RAID 5 disk array with hot spares. Even so, catastrophic failures or user errors can result in data loss.

Figure 4-3. The notification dialog box is triggered in Safari when the HTML5 Geolocation APIs are used Apart from providing the necessary mechanism to request permission to share your location, some implementations (Firefox, for example) also allow you to remember the permission granted to the site for the next time you enter. This is similar to how you can remember passwords for certain sites in your browser.

The NameNode configuration will accept a comma-separated list of directories and will maintain copies of the data in the full set of directories. This additional level of redundancy provides a current time backup of the file system metadata. The secondary NameNode provides a few-minutes-behind replica of the NameNode data. If your configuration has multiple directories that contain the file system image or the edit log, and one of them is damaged, delete that directory s content and restart the NameNode. If the directory is unavailable, remove it from the list in the configuration and restart the NameNode. If all of the dfs.name.dir directories are unavailable or suspect, do the following: 1. Archive the data if required. 2. Wipe all of the directories listed in dfs.name.dir. 3. Copy the contents of the fs.checkpoint.dir from the secondary NameNode to the fs.checkpoint.dir on the primary NameNode machine. 4. Run the following NameNode command: hadoop namenode -importCheckpoint If there is no good copy of the NameNode data, the secondary NameNode image may be imported. The secondary NameNode takes periodic snapshots, at fs.checkpoint.period intervals, so it is not as current as the NameNode data. You may simply copy the file system image from the secondary NameNode to a file system image directory on the NameNode, and then restart. As the imported data is older than the current state of the HDFS file system, the NameNode may spend significant time in safe mode as it brings the HDFS block store into consistency with restored snapshot.

A mapping file is a normal XML file. It is validated against a DTD, which can be downloaded from http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd or you can look through the annotated version on the companion site for this book (http://hibernatebook.com/). The terminology used in the naming of elements and attributes is somewhat confusing at first because it is the point of contact between the jargon of the object-oriented and the relational worlds.

Tunable Items for Cluster and Jobs 177 Behind the Scenes: What the Framework Does 178 Cluster-Level Tunable Parameters 182 Per-Job Tunable Parameters 188 Monitoring Hadoop Core Services 192 JMX: Hadoop Core Server and Task State Monitor 192 Nagios: A Monitoring and Alert Generation Framework 192 Ganglia: A Visual Monitoring Tool with History 193 Chukwa: A Monitoring Service 196 FailMon: A Hardware Diagnostic Tool 196 Tuning to Improve Job Performance 196 Speeding Up the Job and Task Start 196 Optimizing a Job s Map Phase 198 Tuning the Reduce Task Setup 201 Addressing Job-Level Issues 205 Summary 205.

Note If you've given permission to always give your location to a site in Firefox and later change your mind, you

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