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Below a table is -create with two example constraints. One constraints does not allow non alpha -numeric keys. The other constraint does not allow non numeric values. Two -inserts that violate these constraints are attempted and denied. The scan at -the end shows the inserts were not allowed.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo shell -u username -p pass - -Shell - Apache Accumulo Interactive Shell -- -- version: 1.3.x-incubating -- instance name: instance -- instance id: 00000000-0000-0000-0000-000000000000 -- -- type 'help' for a list of available commands -- -username@instance> createtable testConstraints -username@instance testConstraints> config -t testConstraints -s table.constraint.1=org.apache.accumulo.examples.constraints.NumericValueConstraint -username@instance testConstraints> config -t testConstraints -s table.constraint.2=org.apache.accumulo.examples.constraints.AlphaNumKeyConstrain -username@instance testConstraints> insert r1 cf1 cq1 1111 -username@instance testConstraints> insert r1 cf1 cq1 ABC - Constraint Failures: - ConstraintViolationSummary(constrainClass:org.apache.accumulo.examples.constraints.NumericValueConstraint, violationCode:1, violationDescription:Value is not numeric, numberOfViolatingMutations:1) -username@instance testConstraints> insert r1! cf1 cq1 ABC - Constraint Failures: - ConstraintViolationSummary(constrainClass:org.apache.accumulo.examples.constraints.NumericValueConstraint, violationCode:1, violationDescription:Value is not numeric, numberOfViolatingMutations:1) - ConstraintViolationSummary(constrainClass:org.apache.accumulo.examples.constraints.AlphaNumKeyConstraint, violationCode:1, violationDescription:Row was not alpha numeric, numberOfViolatingMutations:1) -username@instance testConstraints> scan -r1 cf1:cq1 [] 1111 -username@instance testConstraints> -</code></pre> -</div> - - </div> - - -<footer> - - <p><a href="https://www.apache.org";><img src="/images/feather-small.gif" alt="Apache Software Foundation" id="asf-logo" height="100" /></a></p> - - <p>Copyright © 2011-2016 The Apache Software Foundation. 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It has three classes:</p> - -<ul> - <li>Ingest.java - Recursively lists the files and directories under a given path, ingests their names and file info (not the file data!) into an Accumulo table, and indexes the file names in a separate table.</li> - <li>QueryUtil.java - Provides utility methods for getting the info for a file, listing the contents of a directory, and performing single wild card searches on file or directory names.</li> - <li>Viewer.java - Provides a GUI for browsing the file system information stored in Accumulo.</li> - <li>FileCountMR.java - Runs MR over the file system information and writes out counts to an Accumulo table.</li> - <li>FileCount.java - Accomplishes the same thing as FileCountMR, but in a different way. Computes recursive counts and stores them back into table.</li> - <li>StringArraySummation.java - Aggregates counts for the FileCountMR reducer.</li> -</ul> - -<p>To begin, ingest some data with Ingest.java.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.dirlist.Ingest instance zookeepers username password direxample dirindex exampleVis /local/user1/workspace -</code></pre> -</div> - -<p>Note that running this example will create tables direxample and dirindex in Accumulo that you should delete when you have completed the example. -If you modify a file or add new files in the directory ingested (e.g. /local/user1/workspace), you can run Ingest again to add new information into the Accumulo tables.</p> - -<p>To browse the data ingested, use Viewer.java. Be sure to give the âusernameâ user the authorizations to see the data.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.dirlist.Viewer instance zookeepers username password direxample exampleVis /local/user1/workspace -</code></pre> -</div> - -<p>To list the contents of specific directories, use QueryUtil.java.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.dirlist.QueryUtil instance zookeepers username password direxample exampleVis /local/user1 -$ ./bin/accumulo org.apache.accumulo.examples.dirlist.QueryUtil instance zookeepers username password direxample exampleVis /local/user1/workspace -</code></pre> -</div> - -<p>To perform searches on file or directory names, also use QueryUtil.java. Search terms must contain no more than one wild card and cannot contain â/â. -<em>Note</em> these queries run on the <em>dirindex</em> table instead of the direxample table.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.dirlist.QueryUtil instance zookeepers username password dirindex exampleVis filename -search -$ ./bin/accumulo org.apache.accumulo.examples.dirlist.QueryUtil instance zookeepers username password dirindex exampleVis 'filename*' -search -$ ./bin/accumulo org.apache.accumulo.examples.dirlist.QueryUtil instance zookeepers username password dirindex exampleVis '*jar' -search -$ ./bin/accumulo org.apache.accumulo.examples.dirlist.QueryUtil instance zookeepers username password dirindex exampleVis filename*jar -search -</code></pre> -</div> - -<p>To count the number of direct children (directories and files) and descendants (children and childrenâs descendents, directories and files), run the FileCountMR over the direxample table. -The results can be written back to the same table.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/tool.sh lib/accumulo-examples-*[^c].jar org.apache.accumulo.examples.dirlist.FileCountMR instance zookeepers username password direxample direxample exampleVis exampleVis -</code></pre> -</div> - -<p>Alternatively, you can also run FileCount.java.</p> - - </div> - - -<footer> - - <p><a href="https://www.apache.org";><img src="/images/feather-small.gif" alt="Apache Software Foundation" id="asf-logo" height="100" /></a></p> - - <p>Copyright © 2011-2016 The Apache Software Foundation. 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It uses the AgeOffFilter that is provided as -part of the core package org.apache.accumulo.core.iterators.filter. Filters are used by -the FilteringIterator to select desired key/value pairs (or weed out undesired -ones). Filters implement the org.apache.accumulo.core.iterators.iterators.filter.Filter interface which -contains a method accept(Key k, Value v). This method returns true if the key, -value pair are to be delivered and false if they are to be ignored.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>username@instance> createtable filtertest -username@instance filtertest> setiter -t filtertest -scan -p 10 -n myfilter -filter -FilteringIterator uses Filters to accept or reject key/value pairs -----------> entering options: <filterPriorityNumber> <ageoff|regex|filterClass> -----------> set org.apache.accumulo.core.iterators.FilteringIterator option (<name> <value>, hit enter to skip): 0 ageoff -----------> set org.apache.accumulo.core.iterators.FilteringIterator option (<name> <value>, hit enter to skip): -AgeOffFilter removes entries with timestamps more than <ttl> milliseconds old -----------> set org.apache.accumulo.core.iterators.filter.AgeOffFilter parameter currentTime, if set, use the given value as the absolute time in milliseconds as the current time of day: -----------> set org.apache.accumulo.core.iterators.filter.AgeOffFilter parameter ttl, time to live (milliseconds): 30000 -username@instance filtertest> - -username@instance filtertest> scan -username@instance filtertest> insert foo a b c -username@instance filtertest> scan -foo a:b [] c -</code></pre> -</div> - -<p>⦠wait 30 seconds â¦</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>username@instance filtertest> scan -username@instance filtertest> -</code></pre> -</div> - -<p>Note the absence of the entry inserted more than 30 seconds ago. Since the -scope was set to âscanâ, this means the entry is still in Accumulo, but is -being filtered out at query time. To delete entries from Accumulo based on -the ages of their timestamps, AgeOffFilters should be set up for the âmincâ -and âmajcâ scopes, as well.</p> - -<p>To force an ageoff in the persisted data, after setting up the ageoff iterator -on the âmincâ and âmajcâ scopes you can flush and compact your table. This will -happen automatically as a background operation on any table that is being -actively written to, but these are the commands to force compaction:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>username@instance filtertest> setiter -t filtertest -scan -minc -majc -p 10 -n myfilter -filter -FilteringIterator uses Filters to accept or reject key/value pairs -----------> entering options: <filterPriorityNumber> <ageoff|regex|filterClass> -----------> set org.apache.accumulo.core.iterators.FilteringIterator option (<name> <value>, hit enter to skip): 0 ageoff -----------> set org.apache.accumulo.core.iterators.FilteringIterator option (<name> <value>, hit enter to skip): -AgeOffFilter removes entries with timestamps more than <ttl> milliseconds old -----------> set org.apache.accumulo.core.iterators.filter.AgeOffFilter parameter currentTime, if set, use the given value as the absolute time in milliseconds as the current time of day: -----------> set org.apache.accumulo.core.iterators.filter.AgeOffFilter parameter ttl, time to live (milliseconds): 30000 -username@instance filtertest> - -username@instance filtertest> flush -t filtertest -08 11:13:55,745 [shell.Shell] INFO : Flush of table filtertest initiated... -username@instance filtertest> compact -t filtertest -08 11:14:10,800 [shell.Shell] INFO : Compaction of table filtertest scheduled for 20110208111410EST -username@instance filtertest> -</code></pre> -</div> - -<p>After the compaction runs, the newly created files will not contain any data that should be aged off, and the -Accumulo garbage collector will remove the old files.</p> - -<p>To see the iterator settings for a table, use:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>username@instance filtertest> config -t filtertest -f iterator ----------+------------------------------------------+---------------------------------------------------------- -SCOPE | NAME | VALUE ----------+------------------------------------------+---------------------------------------------------------- -table | table.iterator.majc.myfilter .............. | 10,org.apache.accumulo.core.iterators.FilteringIterator -table | table.iterator.majc.myfilter.opt.0 ........ | org.apache.accumulo.core.iterators.filter.AgeOffFilter -table | table.iterator.majc.myfilter.opt.0.ttl .... | 30000 -table | table.iterator.majc.vers .................. | 20,org.apache.accumulo.core.iterators.VersioningIterator -table | table.iterator.majc.vers.opt.maxVersions .. | 1 -table | table.iterator.minc.myfilter .............. | 10,org.apache.accumulo.core.iterators.FilteringIterator -table | table.iterator.minc.myfilter.opt.0 ........ | org.apache.accumulo.core.iterators.filter.AgeOffFilter -table | table.iterator.minc.myfilter.opt.0.ttl .... | 30000 -table | table.iterator.minc.vers .................. | 20,org.apache.accumulo.core.iterators.VersioningIterator -table | table.iterator.minc.vers.opt.maxVersions .. | 1 -table | table.iterator.scan.myfilter .............. | 10,org.apache.accumulo.core.iterators.FilteringIterator -table | table.iterator.scan.myfilter.opt.0 ........ | org.apache.accumulo.core.iterators.filter.AgeOffFilter -table | table.iterator.scan.myfilter.opt.0.ttl .... | 30000 -table | table.iterator.scan.vers .................. | 20,org.apache.accumulo.core.iterators.VersioningIterator -table | table.iterator.scan.vers.opt.maxVersions .. | 1 ----------+------------------------------------------+---------------------------------------------------------- -username@instance filtertest> -</code></pre> -</div> - -<p>If you would like to apply multiple filters, this can be done using a single -iterator. Just continue adding entries during the -âset org.apache.accumulo.core.iterators.FilteringIterator optionâ step. -Make sure to order the filterPriorityNumbers in the order you would like -the filters to be applied.</p> - - </div> - - -<footer> - - <p><a href="https://www.apache.org";><img src="/images/feather-small.gif" alt="Apache Software Foundation" id="asf-logo" height="100" /></a></p> - - <p>Copyright © 2011-2016 The Apache Software Foundation. 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Reads all data between two rows</li> -</ul> - -<p>Log into the accumulo shell:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo shell -u username -p password -</code></pre> -</div> - -<p>Create a table called âhellotableâ:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>username@instance> createtable hellotable -</code></pre> -</div> - -<p>Launch a Java program that inserts data with a BatchWriter:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.helloworld.InsertWithBatchWriter instance zookeepers hellotable username password -</code></pre> -</div> - -<p>Alternatively, the same data can be inserted using MapReduce writers:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.helloworld.InsertWithOutputFormat instance zookeepers hellotable username password -</code></pre> -</div> - -<p>On the accumulo status page at the URL below (where âmasterâ is replaced with the name or IP of your accumulo master), you should see 50K entries</p> - 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<li><a href="https://www.apache.org/foundation/thanks";>Thanks <i class="fa fa-external-link"></i></a></li> - <li><a href="https://www.apache.org/foundation/policies/conduct";>Code of Conduct <i class="fa fa-external-link"></i></a></li> - </ul> - </li> - </ul> - </div> - </div> -</nav> - - - <div class="container"> - <div class="row"> - <div class="col-md-12"> - - <div id="non-canonical" style="display: none; background-color: #F0E68C; padding-left: 1em;"> - Visit the official site at: <a href="https://accumulo.apache.org";>https://accumulo.apache.org</a> - </div> - <div id="content"> - - <h1 class="title">MapReduce Example</h1> - - <p>This example uses mapreduce and accumulo to compute word counts for a set of -documents. This is accomplished using a map-only mapreduce job and a -accumulo table with aggregators.</p> - -<p>To run this example you will need a directory in HDFS containing text files. -The accumulo readme will be used to show how to run this example.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ hadoop fs -copyFromLocal $ACCUMULO_HOME/README /user/username/wc/Accumulo.README -$ hadoop fs -ls /user/username/wc -Found 1 items --rw-r--r-- 2 username supergroup 9359 2009-07-15 17:54 /user/username/wc/Accumulo.README -</code></pre> -</div> - -<p>The first part of running this example is to create a table with aggregation -for the column family count.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo shell -u username -p password -Shell - Apache Accumulo Interactive Shell -- version: 1.3.x-incubating -- instance name: instance -- instance id: 00000000-0000-0000-0000-000000000000 -- -- type 'help' for a list of available commands -- -username@instance> createtable wordCount -a count=org.apache.accumulo.core.iterators.aggregation.StringSummation -username@instance wordCount> quit -</code></pre> -</div> - -<p>After creating the table, run the word count map reduce job.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>[user1@instance accumulo]$ bin/tool.sh lib/accumulo-examples-*[^c].jar org.apache.accumulo.examples.mapreduce.WordCount instance zookeepers /user/user1/wc wordCount -u username -p password - -11/02/07 18:20:11 INFO input.FileInputFormat: Total input paths to process : 1 -11/02/07 18:20:12 INFO mapred.JobClient: Running job: job_201102071740_0003 -11/02/07 18:20:13 INFO mapred.JobClient: map 0% reduce 0% -11/02/07 18:20:20 INFO mapred.JobClient: map 100% reduce 0% -11/02/07 18:20:22 INFO mapred.JobClient: Job complete: job_201102071740_0003 -11/02/07 18:20:22 INFO mapred.JobClient: Counters: 6 -11/02/07 18:20:22 INFO mapred.JobClient: Job Counters -11/02/07 18:20:22 INFO mapred.JobClient: Launched map tasks=1 -11/02/07 18:20:22 INFO mapred.JobClient: Data-local map tasks=1 -11/02/07 18:20:22 INFO mapred.JobClient: FileSystemCounters -11/02/07 18:20:22 INFO mapred.JobClient: HDFS_BYTES_READ=10487 -11/02/07 18:20:22 INFO mapred.JobClient: Map-Reduce Framework -11/02/07 18:20:22 INFO mapred.JobClient: Map input records=255 -11/02/07 18:20:22 INFO mapred.JobClient: Spilled Records=0 -11/02/07 18:20:22 INFO mapred.JobClient: Map output records=1452 -</code></pre> -</div> - -<p>After the map reduce job completes, query the accumulo table to see word -counts.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo shell -u username -p password -username@instance> table wordCount -username@instance wordCount> scan -b the -the count:20080906 [] 75 -their count:20080906 [] 2 -them count:20080906 [] 1 -then count:20080906 [] 1 -there count:20080906 [] 1 -these count:20080906 [] 3 -this count:20080906 [] 6 -through count:20080906 [] 1 -time count:20080906 [] 3 -time. count:20080906 [] 1 -to count:20080906 [] 27 -total count:20080906 [] 1 -tserver, count:20080906 [] 1 -tserver.compaction.major.concurrent.max count:20080906 [] 1 -... -</code></pre> -</div> - - </div> - - -<footer> - - <p><a href="https://www.apache.org";><img src="/images/feather-small.gif" alt="Apache Software Foundation" id="asf-logo" height="100" /></a></p> - - <p>Copyright © 2011-2016 The Apache Software Foundation. Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0";>Apache License, Version 2.0</a>.</p> - -</footer> - - - </div> - </div> - </div> -</body> -</html>
