Google Git
Sign in
apache / hbase-site / 078d9c2109e8ce180eaf0edbed21e849adb2221e / . / testdevapidocs / src-html / org / apache / hadoop / hbase / client / TestPreadReversedScanner.html
blob: b4ecb55bec1aed746bbfcff16bea8b3f01d33ac8 [file] [log] [blame]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.client;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.apache.hadoop.hbase.HBaseClassTestRule;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.apache.hadoop.hbase.HBaseTestingUtility;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.TableName;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.client.Scan.ReadType;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.testclassification.MediumTests;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.junit.After;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.junit.AfterClass;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.junit.Assert;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.junit.BeforeClass;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.junit.ClassRule;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.junit.Test;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.junit.experimental.categories.Category;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.slf4j.Logger;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.slf4j.LoggerFactory;<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>@Category(MediumTests.class)<a name="line.37"></a>
<span class="sourceLineNo">038</span>public class TestPreadReversedScanner {<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span> @ClassRule<a name="line.40"></a>
<span class="sourceLineNo">041</span> public static final HBaseClassTestRule CLASS_RULE =<a name="line.41"></a>
<span class="sourceLineNo">042</span> HBaseClassTestRule.forClass(TestPreadReversedScanner.class);<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span> public static final Logger LOG = LoggerFactory.getLogger(TestPreadReversedScanner.class);<a name="line.44"></a>
<span class="sourceLineNo">045</span> private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span> private static final TableName TABLE_NAME = TableName.valueOf("testPreadSmall");<a name="line.47"></a>
<span class="sourceLineNo">048</span> private static final byte[] COLUMN_FAMILY = Bytes.toBytes("columnFamily");<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span> private static Table htable = null;<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span> @BeforeClass<a name="line.52"></a>
<span class="sourceLineNo">053</span> public static void setUpBeforeClass() throws Exception {<a name="line.53"></a>
<span class="sourceLineNo">054</span> TEST_UTIL.startMiniCluster(1);<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span> // create a table with 4 region: (-oo, b),[b,c),[c,d),[d,+oo)<a name="line.56"></a>
<span class="sourceLineNo">057</span> byte[] bytes = Bytes.toBytes("bcd");<a name="line.57"></a>
<span class="sourceLineNo">058</span> byte[][] splitKeys = new byte[bytes.length][];<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span> for (int i = 0; i &lt; bytes.length; i++) {<a name="line.60"></a>
<span class="sourceLineNo">061</span> splitKeys[i] = new byte[] { bytes[i] };<a name="line.61"></a>
<span class="sourceLineNo">062</span> }<a name="line.62"></a>
<span class="sourceLineNo">063</span> htable = TEST_UTIL.createTable(TABLE_NAME, COLUMN_FAMILY, splitKeys);<a name="line.63"></a>
<span class="sourceLineNo">064</span> }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span> @AfterClass<a name="line.66"></a>
<span class="sourceLineNo">067</span> public static void tearDownAfterClass() throws Exception {<a name="line.67"></a>
<span class="sourceLineNo">068</span> TEST_UTIL.shutdownMiniCluster();<a name="line.68"></a>
<span class="sourceLineNo">069</span> }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span> @After<a name="line.71"></a>
<span class="sourceLineNo">072</span> public void tearDown() throws IOException {<a name="line.72"></a>
<span class="sourceLineNo">073</span> TEST_UTIL.truncateTable(TABLE_NAME);<a name="line.73"></a>
<span class="sourceLineNo">074</span> }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span> /**<a name="line.76"></a>
<span class="sourceLineNo">077</span> * all rowKeys are fit in the last region.<a name="line.77"></a>
<span class="sourceLineNo">078</span> */<a name="line.78"></a>
<span class="sourceLineNo">079</span> @Test<a name="line.79"></a>
<span class="sourceLineNo">080</span> public void testPreadReversedScan01() throws IOException {<a name="line.80"></a>
<span class="sourceLineNo">081</span> String[][] keysCases = new String[][] {<a name="line.81"></a>
<span class="sourceLineNo">082</span> { "d0", "d1", "d2", "d3" }, // all rowKeys fit in the last region.<a name="line.82"></a>
<span class="sourceLineNo">083</span> { "a0", "a1", "a2", "a3" }, // all rowKeys fit in the first region.<a name="line.83"></a>
<span class="sourceLineNo">084</span> { "a0", "b1", "c2", "d3" }, // each region with a rowKey<a name="line.84"></a>
<span class="sourceLineNo">085</span> };<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span> for (int caseIndex = 0; caseIndex &lt; keysCases.length; caseIndex++) {<a name="line.87"></a>
<span class="sourceLineNo">088</span> testPreadReversedScanInternal(keysCases[caseIndex]);<a name="line.88"></a>
<span class="sourceLineNo">089</span> TEST_UTIL.truncateTable(TABLE_NAME);<a name="line.89"></a>
<span class="sourceLineNo">090</span> }<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span> private void testPreadReversedScanInternal(String[] inputRowKeys) throws IOException {<a name="line.93"></a>
<span class="sourceLineNo">094</span> int rowCount = inputRowKeys.length;<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span> for (int i = 0; i &lt; rowCount; i++) {<a name="line.96"></a>
<span class="sourceLineNo">097</span> Put put = new Put(Bytes.toBytes(inputRowKeys[i]));<a name="line.97"></a>
<span class="sourceLineNo">098</span> put.addColumn(COLUMN_FAMILY, null, Bytes.toBytes(i));<a name="line.98"></a>
<span class="sourceLineNo">099</span> htable.put(put);<a name="line.99"></a>
<span class="sourceLineNo">100</span> }<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span> Scan scan = new Scan();<a name="line.102"></a>
<span class="sourceLineNo">103</span> scan.setReversed(true);<a name="line.103"></a>
<span class="sourceLineNo">104</span> scan.setReadType(ReadType.PREAD);<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span> ResultScanner scanner = htable.getScanner(scan);<a name="line.106"></a>
<span class="sourceLineNo">107</span> Result r;<a name="line.107"></a>
<span class="sourceLineNo">108</span> int value = rowCount;<a name="line.108"></a>
<span class="sourceLineNo">109</span> while ((r = scanner.next()) != null) {<a name="line.109"></a>
<span class="sourceLineNo">110</span> Assert.assertArrayEquals(r.getValue(COLUMN_FAMILY, null), Bytes.toBytes(--value));<a name="line.110"></a>
<span class="sourceLineNo">111</span> Assert.assertArrayEquals(r.getRow(), Bytes.toBytes(inputRowKeys[value]));<a name="line.111"></a>
<span class="sourceLineNo">112</span> }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span> Assert.assertEquals(0, value);<a name="line.114"></a>
<span class="sourceLineNo">115</span> }<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span> /**<a name="line.117"></a>
<span class="sourceLineNo">118</span> * Corner case:<a name="line.118"></a>
<span class="sourceLineNo">119</span> * &lt;p/&gt;<a name="line.119"></a>
<span class="sourceLineNo">120</span> * HBase has 4 regions, (-oo,b),[b,c),[c,d),[d,+oo), and only rowKey with byte[]={0x00} locate in<a name="line.120"></a>
<span class="sourceLineNo">121</span> * region (-oo,b) . test whether reversed pread scanner will return infinity results with<a name="line.121"></a>
<span class="sourceLineNo">122</span> * RowKey={0x00}.<a name="line.122"></a>
<span class="sourceLineNo">123</span> */<a name="line.123"></a>
<span class="sourceLineNo">124</span> @Test<a name="line.124"></a>
<span class="sourceLineNo">125</span> public void testSmallReversedScan02() throws IOException {<a name="line.125"></a>
<span class="sourceLineNo">126</span> Put put = new Put(new byte[] { (char) 0x00 });<a name="line.126"></a>
<span class="sourceLineNo">127</span> put.addColumn(COLUMN_FAMILY, null, Bytes.toBytes(0));<a name="line.127"></a>
<span class="sourceLineNo">128</span> htable.put(put);<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span> Scan scan = new Scan();<a name="line.130"></a>
<span class="sourceLineNo">131</span> scan.setCaching(1);<a name="line.131"></a>
<span class="sourceLineNo">132</span> scan.setReversed(true);<a name="line.132"></a>
<span class="sourceLineNo">133</span> scan.setReadType(ReadType.PREAD);<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span> ResultScanner scanner = htable.getScanner(scan);<a name="line.135"></a>
<span class="sourceLineNo">136</span> Result r;<a name="line.136"></a>
<span class="sourceLineNo">137</span> int count = 1;<a name="line.137"></a>
<span class="sourceLineNo">138</span> while ((r = scanner.next()) != null) {<a name="line.138"></a>
<span class="sourceLineNo">139</span> Assert.assertArrayEquals(r.getValue(COLUMN_FAMILY, null), Bytes.toBytes(0));<a name="line.139"></a>
<span class="sourceLineNo">140</span> Assert.assertArrayEquals(r.getRow(), new byte[] { (char) 0x00 });<a name="line.140"></a>
<span class="sourceLineNo">141</span> Assert.assertTrue(--count &gt;= 0);<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<a name="line.142"></a>
<span class="sourceLineNo">143</span> Assert.assertEquals(0, count);<a name="line.143"></a>
<span class="sourceLineNo">144</span> }<a name="line.144"></a>
<span class="sourceLineNo">145</span>}<a name="line.145"></a>
</pre>
</div>
</body>
</html>