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The Katta project, http://katta.sourceforge.net/, describes itself as Lucene in the Cloud, a scalable, fault-tolerant, distributed indexing system capable of serving large replicated Lucene indexes at high loads. Katta uses ZooKeeper to coordinate among the individual servers of the Katta cloud. Katta supports storing shards on the local server file system, HDFS, and in Amazon s S3. Katta also provides a distributed scoring service, allowing for the search results from multiple indexes to be merged together.

The isolation levels permitted by JDBC and Hibernate are listed in Table 9-2. Table 9-2. JDBC Isolation levels

In this chapter, you have seen how something old HTML forms and make it into something new by using new elements, attributes, and APIs available in HTML5. We ve seen new controls for advanced input types, with even more to come. We ve seen how client validation can be integrated directly into form controls in order to prevent unnecessary server round trips to process bad data. Overall, we ve seen ways to reduce the amount of scripting you need to create full-featured applications user interfaces. In the next chapter, we ll investigate how browsers give you the ability to spawn independent execution environments to handle long-running tasks: HTML5 Web Workers.

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Thrift (http://incubator.apache.org/thrift/) and Protocol Buffers (http://code.google. com/p/protobuf/) provide a mechanism for using arbitrarily complex data types as keys or values within Hadoop. The core concept is that of defining a type in a text file and having a tool generate per-language APIs for accessing the data structure and for serializing and deserializing the data structure. As of Hadoop 0.17.0, the framework supports using any type that provides serialization services as a key or a value.

Cascading, http://www.cascading.org/, describes itself as a rich API for handling complex scale-free workflows reliably on a MapReduce cluster. The Cascading package allows the rapid wiring of components together into workflows that support flow control statements. Cascading s metaphor is that the incoming data flows through a series of functions and filters that allow the data to be split into multiple streams and then joined together again as needed. An acyclic-directed graph is built by the framework, out of the functions and filters.

HTML5 Web Workers provide background processing capabilities to web applications and typically run on separate threads so that JavaScript applications using HTML5 Web Workers can take advantage of multicore CPUs. Separating long-running tasks into HTML5 Web Workers also avoids the dreaded slowscript warnings, shown in Figure 8-1, that display when JavaScript loops continue for several seconds.

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CloudStore, http://kosmosfs.sourceforge.net/ (formerly known as the Kosmos file system), provides an alternative file system for use within a MapReduce cluster. Unlike HDFS, CloudStore is implemented in C++.

The Hypertable project, http://www.hypertable.org/, provides a distributed database conceptually similar to HBase and BigTable. The Hypertable site is clear that the project is at a 0.9 release. Currently, the core servers for Hypertable, the Master server and Hyperspace server, are single points of failure. Hypertable does not provide ready-to-run distributions and must be built from source. There are build instructions for CentOS 5.1 and CentOs 5.2, Fedora Core 8 32bit, Gentoo 2007.0, Ubunto 8.10 Intrepid Ibex 32-bit, Max OS X 10.5 Leopard, and Mac OS X 10.4 Tiger. Hypertable provides HQL, a SQL-like language for running queries.

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