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Setting the Classpath</h3> <div class="paragraph"> <p>To use Jython with HBase, your CLASSPATH must include HBase’s classpath as well as -the Jython JARs required by your code. First, use the following command on a server -running the HBase RegionServer process, to get HBase’s classpath.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="bash">$ ps aux |grep regionserver| awk -F 'java.library.path=' {'print $2'} | awk {'print $1'} - -/usr/lib/hadoop/lib/native:/usr/lib/hbase/lib/native/Linux-amd64-64</code></pre> -</div> +the Jython JARs required by your code.</p> </div> <div class="paragraph"> -<p>Set the <code>$CLASSPATH</code> environment variable to include the path you found in the previous -step, plus the path to <code>jython.jar</code> and each additional Jython-related JAR needed for -your project.</p> +<p>Set the path to directory containing the <code>jython.jar</code> and each additional Jython-related JAR needed for +your project. Then export HBASE_CLASSPATH pointing to the $JYTHON_HOME env. variable.</p> </div> <div class="listingblock"> <div class="content"> -<pre class="CodeRay highlight"><code data-lang="bash">$ export CLASSPATH=$CLASSPATH:/usr/lib/hadoop/lib/native:/usr/lib/hbase/lib/native/Linux-amd64-64:/path/to/jython.jar</code></pre> +<pre class="CodeRay highlight"><code data-lang="bash">$ export HBASE_CLASSPATH=/directory/jython.jar</code></pre> </div> </div> <div class="paragraph"> @@ -20725,55 +20716,52 @@ $ bin/hbase org.python.util.jython</p> <div class="title">Example 27. Table Creation, Population, Get, and Delete with Jython</div> <div class="content"> <div class="paragraph"> -<p>The following Jython code example creates a table, populates it with data, fetches -the data, and deletes the table.</p> +<p>The following Jython code example checks for table, +if it exists, deletes it and then creates it. Then it +populates the table with data and fetches the data.</p> </div> <div class="listingblock"> <div class="content"> <pre class="CodeRay highlight"><code data-lang="jython">import java.lang -from org.apache.hadoop.hbase import HBaseConfiguration, HTableDescriptor, HColumnDescriptor, HConstants, TableName -from org.apache.hadoop.hbase.client import HBaseAdmin, HTable, Get -from org.apache.hadoop.hbase.io import Cell, RowResult +from org.apache.hadoop.hbase import HBaseConfiguration, HTableDescriptor, HColumnDescriptor, TableName +from org.apache.hadoop.hbase.client import Admin, Connection, ConnectionFactory, Get, Put, Result, Table +from org.apache.hadoop.conf import Configuration # First get a conf object. This will read in the configuration # that is out in your hbase-*.xml files such as location of the # hbase master node. -conf = HBaseConfiguration() +conf = HBaseConfiguration.create() +connection = ConnectionFactory.createConnection(conf) +admin = connection.getAdmin() -# Create a table named 'test' that has two column families, -# one named 'content, and the other 'anchor'. The colons -# are required for column family names. -tablename = TableName.valueOf("test") +# Create a table named 'test' that has a column family +# named 'content'. +tableName = TableName.valueOf("test") +table = connection.getTable(tableName) -desc = HTableDescriptor(tablename) -desc.addFamily(HColumnDescriptor("content:")) -desc.addFamily(HColumnDescriptor("anchor:")) -admin = HBaseAdmin(conf) +desc = HTableDescriptor(tableName) +desc.addFamily(HColumnDescriptor("content")) # Drop and recreate if it exists -if admin.tableExists(tablename): - admin.disableTable(tablename) - admin.deleteTable(tablename) -admin.createTable(desc) +if admin.tableExists(tableName): + admin.disableTable(tableName) + admin.deleteTable(tableName) -tables = admin.listTables() -table = HTable(conf, tablename) +admin.createTable(desc) # Add content to 'column:' on a row named 'row_x' row = 'row_x' -update = Get(row) -update.put('content:', 'some content') -table.commit(update) +put = Put(row) +put.addColumn("content", "qual", "some content") +table.put(put) # Now fetch the content just added, returns a byte[] -data_row = table.get(row, "content:") -data = java.lang.String(data_row.value, "UTF8") +get = Get(row) -print "The fetched row contains the value '%s'" % data +result = table.get(get) +data = java.lang.String(result.getValue("content", "qual"), "UTF8") -# Delete the table. -admin.disableTable(desc.getName()) -admin.deleteTable(desc.getName())</code></pre> +print "The fetched row contains the value '%s'" % data</code></pre> </div> </div> </div> @@ -20786,25 +20774,24 @@ admin.deleteTable(desc.getName())</code></pre> </div> <div class="listingblock"> <div class="content"> -<pre class="CodeRay highlight"><code data-lang="jython"># Print all rows that are members of a particular column family -# by passing a regex for family qualifier - -import java.lang - -from org.apache.hadoop.hbase import HBaseConfiguration -from org.apache.hadoop.hbase.client import HTable - -conf = HBaseConfiguration() - -table = HTable(conf, "wiki") -col = "title:.*$" - -scanner = table.getScanner([col], "") +<pre class="CodeRay highlight"><code data-lang="jython">import java.lang +from org.apache.hadoop.hbase import TableName, HBaseConfiguration +from org.apache.hadoop.hbase.client import Connection, ConnectionFactory, Result, ResultScanner, Table, Admin +from org.apache.hadoop.conf import Configuration +conf = HBaseConfiguration.create() +connection = ConnectionFactory.createConnection(conf) +admin = connection.getAdmin() +tableName = TableName.valueOf('wiki') +table = connection.getTable(tableName) + +cf = "title" +attr = "attr" +scanner = table.getScanner(cf) while 1: result = scanner.next() if not result: - break - print java.lang.String(result.row), java.lang.String(result.get('title:').value)</code></pre> + break + print java.lang.String(result.row), java.lang.String(result.getValue(cf, attr))</code></pre> </div> </div> </div> @@ -40385,7 +40372,7 @@ org/apache/hadoop/hbase/security/access/AccessControlClient.revoke:(Lorg/apache/ <div id="footer"> <div id="footer-text"> Version 3.0.0-SNAPSHOT<br> -Last updated 2018-06-20 04:06:07 UTC +Last updated 2018-06-21 05:09:48 UTC </div> </div> </body> http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2b11656f/bulk-loads.html ---------------------------------------------------------------------- diff --git a/bulk-loads.html b/bulk-loads.html index 22f2b07..c796608 100644 --- a/bulk-loads.html +++ b/bulk-loads.html @@ -7,7 +7,7 @@ <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> - <meta name="Date-Revision-yyyymmdd" content="20180620" /> + <meta name="Date-Revision-yyyymmdd" content="20180621" /> <meta http-equiv="Content-Language" content="en" /> <title>Apache HBase – Bulk Loads in Apache HBase (TM) @@ -306,7 +306,7 @@ under the License. --> <a href="https://www.apache.org/";>The Apache Software Foundation</a>. All rights reserved. - <li id="publishDate" class="pull-right">Last Published: 2018-06-20</li> + <li id="publishDate" class="pull-right">Last Published: 2018-06-21</li> </p> </div>
