Accumulo: Application Development, Table Design, and Best - download pdf or read online

By Aaron Cordova, Billie Rinaldi, Michael Wall

ISBN-10: 1449374182

ISBN-13: 9781449374181

Wake up to hurry on Apache Accumulo, the versatile, high-performance key/value shop created through the nationwide protection business enterprise (NSA) and in keeping with Google’s BigTable facts garage procedure. Written via former NSA group contributors, this finished instructional and reference covers Accumulo structure, program improvement, desk layout, and cell-level security.

With transparent info on approach management, functionality tuning, and top practices, this e-book is perfect for builders looking to write Accumulo functions, directors charged with fitting and retaining Accumulo, and different pros drawn to what Accumulo has to provide. you can find every little thing you should use the program fully.

Get a high-level advent to Accumulo’s structure and information model
Take a quick travel via unmarried- and multiple-node installations, facts ingest, and query
tips on how to write Accumulo purposes for a number of use circumstances, in accordance with examples
Dive into Accumulo internals, together with info now not to be had within the documentation
Get exact info for fitting, administering, tuning, and measuring performance
study top practices in line with profitable implementations within the field
locate solutions to universal questions that each new Accumulo person asks

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Extra resources for Accumulo: Application Development, Table Design, and Best Practices

Example text

This allows one server to manage all the reads and writes for a particular range of keys, enabling reads and writes to be highly consistent because no synchronization has to occur between tablet servers. When a client writes a piece of information to a row, clients reading that row immediately after the write will see the new information. Typically, a server will run one tablet server process and one HDFS DataNode process (Figure 1-27). This allows most tablets to have a local replica of the files they reference.

See Figure 1-22. 30 | Chapter 1: Architecture and Data Model Figure 1-22. Scanning one row BatchScanner When multiple ranges of keys are to be read from a table, a BatchScanner can be used to read the key-value pairs for the ranges using multiple threads. The ranges are grouped by tablet server to maximize the efficiency of communication between threads and tablet servers. This can be useful for applications whose design requires many individual scans to answer a single question. In particular, tables designed for working with time series, secondary indexes, and complex text search can all benefit from using batch scanners.

Usually some combination of row-level or column-level access control will suffice, which col‐ umn visibilities can support just as well. But because a common application on Accumulo involves building secondary indexes, perhaps across several types of data of differing sensitivity levels, each keyvalue pair in an index will end up needing a specific column visibility based on the row and column from which it originated. Applications that use these types of indexes are very powerful because they allow different views of the data to be com‐ posed on the fly, according to the access level of the user performing the query.

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Accumulo: Application Development, Table Design, and Best Practices by Aaron Cordova, Billie Rinaldi, Michael Wall


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