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HBASE-11337 Document how to create, modify, delete a table using Java (Misty Stanley-Jones)

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Michael Stack 2014-06-13 10:21:19 -07:00
parent 6764275ff0
commit 91991b72af
3 changed files with 138 additions and 3 deletions
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2
src/main/docbkx/book.xml
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@ -3300,7 +3300,7 @@ All the settings that apply to normal compactions (file size limits, etc.) apply
</section>
</chapter> <!-- architecture -->
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="hbase_apis.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="external_apis.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="thrift_filter_language.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="cp.xml" />

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src/main/docbkx/external_apis.xml
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@ -29,8 +29,10 @@
*/
-->
<title>Apache HBase External APIs</title>
<para> This chapter will cover access to Apache HBase either through non-Java languages, or through custom protocols.
</para>
<para> This chapter will cover access to Apache HBase either through non-Java languages, or
through custom protocols. For information on using the native HBase APIs, refer to <link
xlink:href="http://hbase.apache.org/apidocs/index.html">User API Reference</link> and the new <xref
linkend="hbase_apis" /> chapter. </para>
<section xml:id="nonjava.jvm">
<title>Non-Java Languages Talking to the JVM</title>
<para>Currently the documentation on this topic in the

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src/main/docbkx/hbase_apis.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<chapter
version="5.0"
xml:id="hbase_apis"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:m="http://www.w3.org/1998/Math/MathML"
xmlns:html="http://www.w3.org/1999/xhtml"
xmlns:db="http://docbook.org/ns/docbook">
<!--
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-->
<title>Apache HBase APIs</title>
<para>This chapter provides information about performing operations using HBase native APIs. This
information is not exhaustive, and provides a quick reference in addition to the <link
xlink:href="http://hbase.apache.org/apidocs/index.html">User API
Reference</link>. The examples here are not comprehensive or complete, and should be used for
purposes of illustration only.</para>
<para>Apache HBase also works with multiple external APIs. See <xref linkend="external_apis" />
for more information.</para>
<example>
<title>Create a Table Using Java</title>
<para>This example has been tested on HBase 0.96.1.1.</para>
<programlisting>
package com.example.hbase.admin;
import java.io.IOException;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.io.compress.Compression.Algorithm;
import org.apache.hadoop.conf.Configuration;
import static com.example.hbase.Constants.*;
public class CreateSchema {
public static void createOrOverwrite(HBaseAdmin admin, HTableDescriptor table) throws IOException {
if (admin.tableExists(table.getName())) {
admin.disableTable(table.getName());
admin.deleteTable(table.getName());
}
admin.createTable(table);
}
public static void createSchemaTables (Configuration config) {
try {
final HBaseAdmin admin = new HBaseAdmin(config);
HTableDescriptor table = new HTableDescriptor(TableName.valueOf(TABLE_NAME));
table.addFamily(new HColumnDescriptor(CF_DEFAULT).setCompressionType(Algorithm.SNAPPY));
System.out.print("Creating table. ");
createOrOverwrite(admin, table);
System.out.println(" Done.");
admin.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
}
}
</programlisting>
</example>
<example>
<title>Add, Modify, and Delete a Table</title>
<para>This example has been tested on HBase 0.96.1.1.</para>
<programlisting>
public static void upgradeFrom0 (Configuration config) {
try {
final HBaseAdmin admin = new HBaseAdmin(config);
TableName tableName = TableName.valueOf(TABLE_ASSETMETA);
HTableDescriptor table_assetmeta = new HTableDescriptor(tableName);
table_assetmeta.addFamily(new HColumnDescriptor(CF_DEFAULT).setCompressionType(Algorithm.SNAPPY));
// Create a new table.
System.out.print("Creating table_assetmeta. ");
admin.createTable(table_assetmeta);
System.out.println(" Done.");
// Update existing table
HColumnDescriptor newColumn = new HColumnDescriptor("NEWCF");
newColumn.setCompactionCompressionType(Algorithm.GZ);
newColumn.setMaxVersions(HConstants.ALL_VERSIONS);
admin.addColumn(tableName, newColumn);
// Disable an existing table
admin.disableTable(tableName);
// Delete an existing column family
admin.deleteColumn(tableName, CF_DEFAULT);
// Delete a table (Need to be disabled first)
admin.deleteTable(tableName);
admin.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
}
</programlisting>
</example>
</chapter>