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<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.replication.regionserver;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import static org.junit.Assert.assertEquals;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static org.junit.Assert.assertTrue;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.HBaseClassTestRule;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.testclassification.ReplicationTests;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.testclassification.SmallTests;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.junit.ClassRule;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.junit.Test;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.junit.experimental.categories.Category;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.slf4j.Logger;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.slf4j.LoggerFactory;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>@Category({ReplicationTests.class, SmallTests.class})<a name="line.32"></a>
<span class="sourceLineNo">033</span>public class TestReplicationThrottler {<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span> @ClassRule<a name="line.35"></a>
<span class="sourceLineNo">036</span> public static final HBaseClassTestRule CLASS_RULE =<a name="line.36"></a>
<span class="sourceLineNo">037</span> HBaseClassTestRule.forClass(TestReplicationThrottler.class);<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span> private static final Logger LOG = LoggerFactory.getLogger(TestReplicationThrottler.class);<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span> /**<a name="line.41"></a>
<span class="sourceLineNo">042</span> * unit test for throttling<a name="line.42"></a>
<span class="sourceLineNo">043</span> */<a name="line.43"></a>
<span class="sourceLineNo">044</span> @Test<a name="line.44"></a>
<span class="sourceLineNo">045</span> public void testThrottling() {<a name="line.45"></a>
<span class="sourceLineNo">046</span> LOG.info("testThrottling");<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span> // throttle bandwidth is 100 and 10 bytes/cycle respectively<a name="line.48"></a>
<span class="sourceLineNo">049</span> ReplicationThrottler throttler1 = new ReplicationThrottler(100);<a name="line.49"></a>
<span class="sourceLineNo">050</span> ReplicationThrottler throttler2 = new ReplicationThrottler(10);<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span> long ticks1 = throttler1.getNextSleepInterval(1000);<a name="line.52"></a>
<span class="sourceLineNo">053</span> long ticks2 = throttler2.getNextSleepInterval(1000);<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span> // 1. the first push size is 1000, though 1000 bytes exceeds 100/10<a name="line.55"></a>
<span class="sourceLineNo">056</span> // bandwidthes, but no sleep since it's the first push of current<a name="line.56"></a>
<span class="sourceLineNo">057</span> // cycle, amortizing occurs when next push arrives<a name="line.57"></a>
<span class="sourceLineNo">058</span> assertEquals(0, ticks1);<a name="line.58"></a>
<span class="sourceLineNo">059</span> assertEquals(0, ticks2);<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span> throttler1.addPushSize(1000);<a name="line.61"></a>
<span class="sourceLineNo">062</span> throttler2.addPushSize(1000);<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span> ticks1 = throttler1.getNextSleepInterval(5);<a name="line.64"></a>
<span class="sourceLineNo">065</span> ticks2 = throttler2.getNextSleepInterval(5);<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span> // 2. when the second push(5) arrives and throttling(5) is called, the<a name="line.67"></a>
<span class="sourceLineNo">068</span> // current cyclePushSize is 1000 bytes, this should make throttler1<a name="line.68"></a>
<span class="sourceLineNo">069</span> // sleep 1000/100 = 10 cycles = 1s and make throttler2 sleep 1000/10<a name="line.69"></a>
<span class="sourceLineNo">070</span> // = 100 cycles = 10s before the second push occurs -- amortize case<a name="line.70"></a>
<span class="sourceLineNo">071</span> // after amortizing, both cycleStartTick and cyclePushSize are reset<a name="line.71"></a>
<span class="sourceLineNo">072</span> //<a name="line.72"></a>
<span class="sourceLineNo">073</span> // Note: in a slow machine, the sleep interval might be less than ideal ticks.<a name="line.73"></a>
<span class="sourceLineNo">074</span> // If it is 75% of expected value, its is still acceptable.<a name="line.74"></a>
<span class="sourceLineNo">075</span> if (ticks1 != 1000 &amp;&amp; ticks1 != 999) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> assertTrue(ticks1 &gt;= 750 &amp;&amp; ticks1 &lt;=1000);<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span> if (ticks2 != 10000 &amp;&amp; ticks2 != 9999) {<a name="line.78"></a>
<span class="sourceLineNo">079</span> assertTrue(ticks2 &gt;= 7500 &amp;&amp; ticks2 &lt;=10000);<a name="line.79"></a>
<span class="sourceLineNo">080</span> }<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span> throttler1.resetStartTick();<a name="line.82"></a>
<span class="sourceLineNo">083</span> throttler2.resetStartTick();<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span> throttler1.addPushSize(5);<a name="line.85"></a>
<span class="sourceLineNo">086</span> throttler2.addPushSize(5);<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span> ticks1 = throttler1.getNextSleepInterval(45);<a name="line.88"></a>
<span class="sourceLineNo">089</span> ticks2 = throttler2.getNextSleepInterval(45);<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span> // 3. when the third push(45) arrives and throttling(45) is called, the<a name="line.91"></a>
<span class="sourceLineNo">092</span> // current cyclePushSize is 5 bytes, 50-byte makes throttler1 no<a name="line.92"></a>
<span class="sourceLineNo">093</span> // sleep, but can make throttler2 delay to next cycle<a name="line.93"></a>
<span class="sourceLineNo">094</span> // note: in real case, sleep time should cover time elapses during push<a name="line.94"></a>
<span class="sourceLineNo">095</span> // operation<a name="line.95"></a>
<span class="sourceLineNo">096</span> assertTrue(ticks1 == 0);<a name="line.96"></a>
<span class="sourceLineNo">097</span> if (ticks2 != 100 &amp;&amp; ticks2 != 99) {<a name="line.97"></a>
<span class="sourceLineNo">098</span> assertTrue(ticks1 &gt;= 75 &amp;&amp; ticks1 &lt;=100);<a name="line.98"></a>
<span class="sourceLineNo">099</span> }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span> throttler2.resetStartTick();<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span> throttler1.addPushSize(45);<a name="line.103"></a>
<span class="sourceLineNo">104</span> throttler2.addPushSize(45);<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span> ticks1 = throttler1.getNextSleepInterval(60);<a name="line.106"></a>
<span class="sourceLineNo">107</span> ticks2 = throttler2.getNextSleepInterval(60);<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span> // 4. when the fourth push(60) arrives and throttling(60) is called, throttler1<a name="line.109"></a>
<span class="sourceLineNo">110</span> // delay to next cycle since 45+60 == 105; and throttler2 should firstly sleep<a name="line.110"></a>
<span class="sourceLineNo">111</span> // ceiling(45/10)= 5 cycles = 500ms to amortize previous push<a name="line.111"></a>
<span class="sourceLineNo">112</span> //<a name="line.112"></a>
<span class="sourceLineNo">113</span> // Note: in real case, sleep time should cover time elapses during push operation<a name="line.113"></a>
<span class="sourceLineNo">114</span> if (ticks1 != 100 &amp;&amp; ticks1 != 99) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> assertTrue(ticks1 &gt;= 75 &amp;&amp; ticks1 &lt;=100);<a name="line.115"></a>
<span class="sourceLineNo">116</span> }<a name="line.116"></a>
<span class="sourceLineNo">117</span> if (ticks2 != 500 &amp;&amp; ticks2 != 499) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> assertTrue(ticks1 &gt;= 375 &amp;&amp; ticks1 &lt;=500);<a name="line.118"></a>
<span class="sourceLineNo">119</span> }<a name="line.119"></a>
<span class="sourceLineNo">120</span> }<a name="line.120"></a>
<span class="sourceLineNo">121</span>}<a name="line.121"></a>
</pre>
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