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<li><a href="Writing_Accumulo_Clients.html#Writing_Data">Writing Data</a></li> - <li><a href="Writing_Accumulo_Clients.html#Reading_Data">Reading Data</a></li> -</ul> - -<hr /> - -<h2 id="a-idwritingaccumuloclientsa-writing-accumulo-clients"><a id="Writing_Accumulo_Clients"></a> Writing Accumulo Clients</h2> - -<p>All clients must first identify the Accumulo instance to which they will be communicating. Code to do this is as follows:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>String instanceName = "myinstance"; -String zooServers = "zooserver-one,zooserver-two" -Instance inst = new ZooKeeperInstance(instanceName, zooServers); - -Connector conn = new Connector(inst, "user","passwd".getBytes()); -</code></pre> -</div> - -<h2 id="a-idwritingdataa-writing-data"><a id="Writing_Data"></a> Writing Data</h2> - -<p>Data are written to Accumulo by creating Mutation objects that represent all the changes to the columns of a single row. The changes are made atomically in the TabletServer. Clients then add Mutations to a BatchWriter which submits them to the appropriate TabletServers.</p> - -<p>Mutations can be created thus:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>Text rowID = new Text("row1"); -Text colFam = new Text("myColFam"); -Text colQual = new Text("myColQual"); -ColumnVisibility colVis = new ColumnVisibility("public"); -long timestamp = System.currentTimeMillis(); - -Value value = new Value("myValue".getBytes()); - -Mutation mutation = new Mutation(rowID); -mutation.put(colFam, colQual, colVis, timestamp, value); -</code></pre> -</div> - -<h3 id="a-idbatchwritera-batchwriter"><a id="BatchWriter"></a> BatchWriter</h3> - -<p>The BatchWriter is highly optimized to send Mutations to multiple TabletServers and automatically batches Mutations destined for the same TabletServer to amortize network overhead. Care must be taken to avoid changing the contents of any Object passed to the BatchWriter since it keeps objects in memory while batching.</p> - -<p>Mutations are added to a BatchWriter thus:</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>long memBuf = 1000000L; // bytes to store before sending a batch -long timeout = 1000L; // milliseconds to wait before sending -int numThreads = 10; - -BatchWriter writer = - conn.createBatchWriter("table", memBuf, timeout, numThreads) - -writer.add(mutation); - -writer.close(); -</code></pre> -</div> - -<p>An example of using the batch writer can be found at <br /> -accumulo/docs/examples/README.batch</p> - -<h2 id="a-idreadingdataa-reading-data"><a id="Reading_Data"></a> Reading Data</h2> - -<p>Accumulo is optimized to quickly retrieve the value associated with a given key, and to efficiently return ranges of consecutive keys and their associated values.</p> - -<h3 id="a-idscannera-scanner"><a id="Scanner"></a> Scanner</h3> - -<p>To retrieve data, Clients use a Scanner, which provides acts like an Iterator over keys and values. Scanners can be configured to start and stop at particular keys, and to return a subset of the columns available.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>// specify which visibilities we are allowed to see -Authorizations auths = new Authorizations("public"); - -Scanner scan = - conn.createScanner("table", auths); - -scan.setRange(new Range("harry","john")); -scan.fetchFamily("attributes"); - -for(Entry<Key,Value> entry : scan) { - String row = e.getKey().getRow(); - Value value = e.getValue(); -} -</code></pre> -</div> - -<h3 id="a-idbatchscannera-batchscanner"><a id="BatchScanner"></a> BatchScanner</h3> - -<p>For some types of access, it is more efficient to retrieve several ranges simultaneously. This arises when accessing a set of rows that are not consecutive whose IDs have been retrieved from a secondary index, for example.</p> - -<p>The BatchScanner is configured similarly to the Scanner; it can be configured to retrieve a subset of the columns available, but rather than passing a single Range, BatchScanners accept a set of Ranges. It is important to note that the keys returned by a BatchScanner are not in sorted order since the keys streamed are from multiple TabletServers in parallel.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>ArrayList<Range> ranges = new ArrayList<Range>(); -// populate list of ranges ... - -BatchScanner bscan = - conn.createBatchScanner("table", auths, 10); - -bscan.setRanges(ranges); -bscan.fetchFamily("attributes"); - -for(Entry<Key,Value> entry : scan) - System.out.println(e.getValue()); -</code></pre> -</div> - -<p>An example of the BatchScanner can be found at <br /> -accumulo/docs/examples/README.batch</p> - -<hr /> - -<p>** Next:** <a href="Table_Configuration.html">Table Configuration</a> ** Up:** <a href="accumulo_user_manual.html">Apache Accumulo User Manual Version 1.3</a> ** Previous:** <a href="Accumulo_Shell.html">Accumulo Shell</a> ** <a href="Contents.html">Contents</a>**</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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To build this example run maven and then -copy the produced jar into the accumulo lib dir. This is already done in the -tar distribution.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ bin/accumulo shell -u username -Enter current password for 'username'@'instance': *** - -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 aggtest1 -a app=org.apache.accumulo.examples.aggregation.SortedSetAggregator -username@instance aggtest1> insert foo app 1 a -username@instance aggtest1> insert foo app 1 b -username@instance aggtest1> scan -foo app:1 [] a,b -username@instance aggtest1> insert foo app 1 z,1,foo,w -username@instance aggtest1> scan -foo app:1 [] 1,a,b,foo,w,z -username@instance aggtest1> insert foo app 2 cat,dog,muskrat -username@instance aggtest1> insert foo app 2 mouse,bird -username@instance aggtest1> scan -foo app:1 [] 1,a,b,foo,w,z -foo app:2 [] bird,cat,dog,mouse,muskrat -username@instance aggtest1> -</code></pre> -</div> - -<p>In this example a table is created and the example set aggregator is -applied to the column family app.</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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To compile -the example, run maven and copy the produced jar into the accumulo lib dir. -This is already done in the tar distribution.</p> - -<p>Below are commands that add 10000 entries to accumulo and then do 100 random -queries. The write command generates random 50 byte values.</p> - -<p>Be sure to use the name of your instance (given as instance here) and the appropriate -list of zookeeper nodes (given as zookeepers here).</p> - -<p>Before you run this, you must ensure that the user you are running has the -âexampleVisâ authorization. (you can set this in the shell with âsetauths -u username -s exampleVisâ)</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo shell -u root -> setauths -u username -s exampleVis -> exit -</code></pre> -</div> - -<p>You must also create the table, batchtest1, ahead of time. (In the shell, use âcreatetable batchtest1â)</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo shell -u username -> createtable batchtest1 -> exit -$ ./bin/accumulo org.apache.accumulo.examples.client.SequentialBatchWriter instance zookeepers username password batchtest1 0 10000 50 20000000 500 20 exampleVis -$ ./bin/accumulo org.apache.accumulo.examples.client.RandomBatchScanner instance zookeepers username password batchtest1 100 0 10000 50 20 exampleVis -07 11:33:11,103 [client.CountingVerifyingReceiver] INFO : Generating 100 random queries... -07 11:33:11,112 [client.CountingVerifyingReceiver] INFO : finished -07 11:33:11,260 [client.CountingVerifyingReceiver] INFO : 694.44 lookups/sec 0.14 secs - -07 11:33:11,260 [client.CountingVerifyingReceiver] INFO : num results : 100 - -07 11:33:11,364 [client.CountingVerifyingReceiver] INFO : Generating 100 random queries... -07 11:33:11,370 [client.CountingVerifyingReceiver] INFO : finished -07 11:33:11,416 [client.CountingVerifyingReceiver] INFO : 2173.91 lookups/sec 0.05 secs - -07 11:33:11,416 [client.CountingVerifyingReceiver] INFO : num results : 100 -</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 also -shows how bloom filters increase query performance when looking for values that -do not exist in a table.</p> - -<p>Below table named bloom_test is created and bloom filters are enabled.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./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> setauths -u username -s exampleVis -username@instance> createtable bloom_test -username@instance bloom_test> config -t bloom_test -s table.bloom.enabled=true -username@instance bloom_test> exit -</code></pre> -</div> - -<p>Below 1 million random values are inserted into accumulo. The randomly -generated rows range between 0 and 1 billion. The random number generator is -initialized with the seed 7.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.client.RandomBatchWriter -s 7 instance zookeepers username password bloom_test 1000000 0 1000000000 50 2000000 60000 3 exampleVis -</code></pre> -</div> - -<p>Below the table is flushed, look at the monitor page and wait for the flush to -complete.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo shell -u username -p password -username@instance> flush -t bloom_test -Flush of table bloom_test initiated... -username@instance> exit -</code></pre> -</div> - -<p>The flush will be finished when there are no entries in memory and the -number of minor compactions goes to zero. Refresh the page to see changes to the table.</p> - -<p>After the flush completes, 500 random queries are done against the table. The -same seed is used to generate the queries, therefore everything is found in the -table.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.client.RandomBatchScanner -s 7 instance zookeepers username password bloom_test 500 0 1000000000 50 20 exampleVis -Generating 500 random queries...finished -96.19 lookups/sec 5.20 secs -num results : 500 -Generating 500 random queries...finished -102.35 lookups/sec 4.89 secs -num results : 500 -</code></pre> -</div> - -<p>Below another 500 queries are performed, using a different seed which results -in nothing being found. In this case the lookups are much faster because of -the bloom filters.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ../bin/accumulo org.apache.accumulo.examples.client.RandomBatchScanner -s 8 instance zookeepers username password bloom_test 500 0 1000000000 50 20 exampleVis -Generating 500 random queries...finished -2212.39 lookups/sec 0.23 secs -num results : 0 -Did not find 500 rows -Generating 500 random queries...finished -4464.29 lookups/sec 0.11 secs -num results : 0 -Did not find 500 rows -</code></pre> -</div> - -<hr /> - -<p>Bloom filters can also speed up lookups for entries that exist. In accumulo -data is divided into tablets and each tablet has multiple map files. Every -lookup in accumulo goes to a specific tablet where a lookup is done on each -map file in the tablet. So if a tablet has three map files, lookup performance -can be three times slower than a tablet with one map file. However if the map -files contain unique sets of data, then bloom filters can help eliminate map -files that do not contain the row being looked up. To illustrate this two -identical tables were created using the following process. One table had bloom -filters, the other did not. Also the major compaction ratio was increased to -prevent the files from being compacted into one file.</p> - -<ul> - <li>Insert 1 million entries using RandomBatchWriter with a seed of 7</li> - <li>Flush the table using the shell</li> - <li>Insert 1 million entries using RandomBatchWriter with a seed of 8</li> - <li>Flush the table using the shell</li> - <li>Insert 1 million entries using RandomBatchWriter with a seed of 9</li> - <li>Flush the table using the shell</li> -</ul> - -<p>After following the above steps, each table will have a tablet with three map -files. Each map file will contain 1 million entries generated with a different -seed.</p> - -<p>Below 500 lookups are done against the table without bloom filters using random -NG seed 7. Even though only one map file will likely contain entries for this -seed, all map files will be interrogated.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.client.RandomBatchScanner -s 7 instance zookeepers username password bloom_test1 500 0 1000000000 50 20 exampleVis -Generating 500 random queries...finished -35.09 lookups/sec 14.25 secs -num results : 500 -Generating 500 random queries...finished -35.33 lookups/sec 14.15 secs -num results : 500 -</code></pre> -</div> - -<p>Below the same lookups are done against the table with bloom filters. The -lookups were 2.86 times faster because only one map file was used, even though three -map files existed.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.client.RandomBatchScanner -s 7 instance zookeepers username password bloom_test2 500 0 1000000000 50 20 exampleVis -Generating 500 random queries...finished -99.03 lookups/sec 5.05 secs -num results : 500 -Generating 500 random queries...finished -101.15 lookups/sec 4.94 secs -num results : 500 -</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> http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/c0655661/user_manual_1.3-incubating/examples/bulkIngest.html ---------------------------------------------------------------------- diff --git a/user_manual_1.3-incubating/examples/bulkIngest.html b/user_manual_1.3-incubating/examples/bulkIngest.html deleted file mode 100644 index 4cc5dd0..0000000 --- a/user_manual_1.3-incubating/examples/bulkIngest.html +++ /dev/null @@ -1,214 +0,0 @@ -<!DOCTYPE html> -<html lang="en"> -<head> -<!-- - Licensed to the Apache Software Foundation (ASF) under one or more - contributor license agreements. 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This example creates a -table called test_bulk which has two initial split points. Then 1000 rows of -test data are created in HDFS. After that the 1000 rows are ingested into -accumulo. Then we verify the 1000 rows are in accumulo. The -first two arguments to all of the commands except for GenerateTestData are the -accumulo instance name, and a comma-separated list of zookeepers.</p> - -<div class="highlighter-rouge"><pre class="highlight"><code>$ ./bin/accumulo org.apache.accumulo.examples.mapreduce.bulk.SetupTable instance zookeepers username password test_bulk row_00000333 row_00000666 -$ ./bin/accumulo org.apache.accumulo.examples.mapreduce.bulk.GenerateTestData 0 1000 bulk/test_1.txt - -$ ./bin/tool.sh lib/accumulo-examples-*[^c].jar org.apache.accumulo.examples.mapreduce.bulk.BulkIngestExample instance zookeepers username password test_bulk bulk tmp/bulkWork -$ ./bin/accumulo org.apache.accumulo.examples.mapreduce.bulk.VerifyIngest instance zookeepers username password test_bulk 0 1000 -</code></pre> -</div> - -<p>For a high level discussion of bulk ingest, see the docs dir.</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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