Download E-books Accumulo: Application Development, Table Design, and Best Practices PDF

By Aaron Cordova, Billie Rinaldi, Michael Wall

wake up to hurry on Apache Accumulo, the versatile, high-performance key/value shop created by way of the nationwide defense corporation (Nsa) and in line with Google’s BigTable facts garage method. Written by way of former Nsa staff individuals, this accomplished educational and reference covers Accumulo structure, program improvement, desk layout, and cell-level security.

With transparent info on method management, functionality tuning, and most sensible practices, this publication is perfect for builders looking to write Accumulo functions, directors charged with fitting and holding Accumulo, and different pros drawn to what Accumulo has to supply. you can find every little thing you can use the program fully.

  • Get a high-level advent to Accumulo’s structure and information model
  • Take a fast journey via unmarried- and multiple-node installations, facts ingest, and query
  • Learn how you can write Accumulo purposes for numerous use instances, in line with examples
  • Dive into Accumulo internals, together with info no longer to be had within the documentation
  • Get specific info for fitting, administering, tuning, and measuring performance
  • Learn top practices in accordance with profitable implementations within the field
  • Find solutions to universal questions that each new Accumulo person asks

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Utilizing an easy Iterator the very last thing we wish to exhibit in Java code is easy methods to organize an iterator. The shell instance used the integrated GrepIterator. we'll do an analogous right here. To run the instance, use the next, back changing the example identify and ZooKeeper situation as applicable: mvn fresh collect exec:exec -Dtable. name=table2 -Dterm=town \ -Dinstance. name=miniInstance -Dzookeeper. location=localhost:$ZKPORT -Pjava:grep Your effects may still seem like this: working grep command Grepping table2 effects -> bob jones contact:city [billing] 1425613620377 fake anytown fred smith contact:city [billing] 1425613646562 fake othertown The Java code is the same to the test instance, yet rather than constructing a variety, we upload the GrepIterator to the Scanner. this is the code: approach. out. println("Grepping " + table); Authorizations authorizations = connection. securityOperations() . getUserAuthorizations(user); Scanner scanner = connection. createScanner(table, authorizations); Map grepProps = new HashMap(); grepProps. put("term", term); IteratorSetting is = new IteratorSetting(25, "sample-grep", GrepIterator. classification. getName(), grepProps); scanner. addScanIterator(is); method. out. println("Results ->"); for (Entry access : scanner) { procedure. out. println(" " + access. getKey() + " " + access. getValue()); } The authorizations are manage online 2 simply as within the SCAN_ALL case for the ScanCommand. The scanner is created an identical manner additionally, proven on-line three. yet on-line 6, we build an IteratorSetting utilizing a GrepIterator and map of homes that set the time period to be the price we handed in, city therefore. The 25 within the is the concern of this iterator. The "sample-grep" string is a different identify for the iterator that would be used as a key to crew jointly the iterator’s configuration details in ZooKeeper (its precedence, category, and options). Line 7 indicates how the IteratorSetting is further to the Scanner. Looping over effects is simply as used to be proven within the ScanCommand. Tip Iterator names has to be particular inside a desk and iterator scope. So needs to iterator priorities. extra on iterator configuration are available in “Iterators”. A extra entire set up even supposing the quickstart instance utilizing the MiniAccumuloCluster gets you began speedy, that set up doesn’t commence numerous elements, comparable to the computer screen. The Hadoop deploy is minimum, so that you don't get an opportunity to profit any of these instruments. The MiniAccumuloCluster is actually greater for beginning Accumulo and utilizing it for trying out. So if MiniAccumuloCluster isn't really what such a lot builders use, what's the most sensible method to get a improvement surroundings organize? so much builders use a whole deploy, both on one node or in small cluster with digital machines (VMs) or on a provider like Amazon EC2. regularly that calls for dealing with the method of putting in Hadoop, ZooKeeper, and Accumulo separately. it is a daunting activity in case you have no event with any of those parts.

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