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[07/51] [partial] hbase-site git commit: HBASE-17121 Undo the
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-<div id="overview"><a href="../../../../../testdevapidocs/org/apache/hadoop/hbase/TestRegionRebalancing.html">View Javadoc</a></div><pre>
-
-<a class="jxr_linenumber" name="1" href="#1">1</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="2" href="#2">2</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="3" href="#3">3</a> <em class="jxr_javadoccomment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
-<a class="jxr_linenumber" name="4" href="#4">4</a> <em class="jxr_javadoccomment"> * or more contributor license agreements. See the NOTICE file</em>
-<a class="jxr_linenumber" name="5" href="#5">5</a> <em class="jxr_javadoccomment"> * distributed with this work for additional information</em>
-<a class="jxr_linenumber" name="6" href="#6">6</a> <em class="jxr_javadoccomment"> * regarding copyright ownership. The ASF licenses this file</em>
-<a class="jxr_linenumber" name="7" href="#7">7</a> <em class="jxr_javadoccomment"> * to you under the Apache License, Version 2.0 (the</em>
-<a class="jxr_linenumber" name="8" href="#8">8</a> <em class="jxr_javadoccomment"> * "License"); you may not use this file except in compliance</em>
-<a class="jxr_linenumber" name="9" href="#9">9</a> <em class="jxr_javadoccomment"> * with the License. You may obtain a copy of the License at</em>
-<a class="jxr_linenumber" name="10" href="#10">10</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="11" href="#11">11</a> <em class="jxr_javadoccomment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
-<a class="jxr_linenumber" name="12" href="#12">12</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="13" href="#13">13</a> <em class="jxr_javadoccomment"> * Unless required by applicable law or agreed to in writing, software</em>
-<a class="jxr_linenumber" name="14" href="#14">14</a> <em class="jxr_javadoccomment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
-<a class="jxr_linenumber" name="15" href="#15">15</a> <em class="jxr_javadoccomment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
-<a class="jxr_linenumber" name="16" href="#16">16</a> <em class="jxr_javadoccomment"> * See the License for the specific language governing permissions and</em>
-<a class="jxr_linenumber" name="17" href="#17">17</a> <em class="jxr_javadoccomment"> * limitations under the License.</em>
-<a class="jxr_linenumber" name="18" href="#18">18</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="19" href="#19">19</a> <strong class="jxr_keyword">package</strong> org.apache.hadoop.hbase;
-<a class="jxr_linenumber" name="20" href="#20">20</a>
-<a class="jxr_linenumber" name="21" href="#21">21</a> <strong class="jxr_keyword">import</strong> <strong class="jxr_keyword">static</strong> org.junit.Assert.assertEquals;
-<a class="jxr_linenumber" name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> <strong class="jxr_keyword">static</strong> org.junit.Assert.fail;
-<a class="jxr_linenumber" name="23" href="#23">23</a>
-<a class="jxr_linenumber" name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> org.apache.commons.logging.Log;
-<a class="jxr_linenumber" name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> org.apache.commons.logging.LogFactory;
-<a class="jxr_linenumber" name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.client.Admin;
-<a class="jxr_linenumber" name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.client.Connection;
-<a class="jxr_linenumber" name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.client.ConnectionFactory;
-<a class="jxr_linenumber" name="29" href="#29">29</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.client.RegionLocator;
-<a class="jxr_linenumber" name="30" href="#30">30</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.master.RegionStates;
-<a class="jxr_linenumber" name="31" href="#31">31</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.regionserver.HRegionServer;
-<a class="jxr_linenumber" name="32" href="#32">32</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
-<a class="jxr_linenumber" name="33" href="#33">33</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.testclassification.FlakeyTests;
-<a class="jxr_linenumber" name="34" href="#34">34</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.testclassification.LargeTests;
-<a class="jxr_linenumber" name="35" href="#35">35</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.util.Bytes;
-<a class="jxr_linenumber" name="36" href="#36">36</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.util.JVMClusterUtil;
-<a class="jxr_linenumber" name="37" href="#37">37</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.util.Threads;
-<a class="jxr_linenumber" name="38" href="#38">38</a> <strong class="jxr_keyword">import</strong> org.junit.After;
-<a class="jxr_linenumber" name="39" href="#39">39</a> <strong class="jxr_keyword">import</strong> org.junit.Before;
-<a class="jxr_linenumber" name="40" href="#40">40</a> <strong class="jxr_keyword">import</strong> org.junit.Test;
-<a class="jxr_linenumber" name="41" href="#41">41</a> <strong class="jxr_keyword">import</strong> org.junit.experimental.categories.Category;
-<a class="jxr_linenumber" name="42" href="#42">42</a> <strong class="jxr_keyword">import</strong> org.junit.runner.RunWith;
-<a class="jxr_linenumber" name="43" href="#43">43</a> <strong class="jxr_keyword">import</strong> org.junit.runners.Parameterized;
-<a class="jxr_linenumber" name="44" href="#44">44</a> <strong class="jxr_keyword">import</strong> org.junit.runners.Parameterized.Parameters;
-<a class="jxr_linenumber" name="45" href="#45">45</a>
-<a class="jxr_linenumber" name="46" href="#46">46</a> <strong class="jxr_keyword">import</strong> java.io.IOException;
-<a class="jxr_linenumber" name="47" href="#47">47</a> <strong class="jxr_keyword">import</strong> java.util.ArrayList;
-<a class="jxr_linenumber" name="48" href="#48">48</a> <strong class="jxr_keyword">import</strong> java.util.Arrays;
-<a class="jxr_linenumber" name="49" href="#49">49</a> <strong class="jxr_keyword">import</strong> java.util.Collection;
-<a class="jxr_linenumber" name="50" href="#50">50</a> <strong class="jxr_keyword">import</strong> java.util.List;
-<a class="jxr_linenumber" name="51" href="#51">51</a>
-<a class="jxr_linenumber" name="52" href="#52">52</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="53" href="#53">53</a> <em class="jxr_javadoccomment"> * Test whether region re-balancing works. (HBASE-71)</em>
-<a class="jxr_linenumber" name="54" href="#54">54</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="55" href="#55">55</a> @Category({FlakeyTests.<strong class="jxr_keyword">class</strong>, LargeTests.<strong class="jxr_keyword">class</strong>})
-<a class="jxr_linenumber" name="56" href="#56">56</a> @RunWith(value = Parameterized.<strong class="jxr_keyword">class</strong>)
-<a class="jxr_linenumber" name="57" href="#57">57</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/hadoop/hbase/TestRegionRebalancing.html">TestRegionRebalancing</a> {
-<a class="jxr_linenumber" name="58" href="#58">58</a>
-<a class="jxr_linenumber" name="59" href="#59">59</a> @Parameters
-<a class="jxr_linenumber" name="60" href="#60">60</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> Collection<Object[]> data() {
-<a class="jxr_linenumber" name="61" href="#61">61</a> Object[][] balancers =
-<a class="jxr_linenumber" name="62" href="#62">62</a> <strong class="jxr_keyword">new</strong> String[][] { { <span class="jxr_string">"org.apache.hadoop.hbase.master.balancer.SimpleLoadBalancer"</span> },
-<a class="jxr_linenumber" name="63" href="#63">63</a> { <span class="jxr_string">"org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer"</span> } };
-<a class="jxr_linenumber" name="64" href="#64">64</a> <strong class="jxr_keyword">return</strong> Arrays.asList(balancers);
-<a class="jxr_linenumber" name="65" href="#65">65</a> }
-<a class="jxr_linenumber" name="66" href="#66">66</a>
-<a class="jxr_linenumber" name="67" href="#67">67</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte[] FAMILY_NAME = Bytes.toBytes(<span class="jxr_string">"col"</span>);
-<a class="jxr_linenumber" name="68" href="#68">68</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Log LOG = LogFactory.getLog(TestRegionRebalancing.<strong class="jxr_keyword">class</strong>);
-<a class="jxr_linenumber" name="69" href="#69">69</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/hadoop/hbase/HBaseTestingUtility.html">HBaseTestingUtility</a> UTIL = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/hadoop/hbase/HBaseTestingUtility.html">HBaseTestingUtility</a>();
-<a class="jxr_linenumber" name="70" href="#70">70</a> <strong class="jxr_keyword">private</strong> RegionLocator regionLocator;
-<a class="jxr_linenumber" name="71" href="#71">71</a> <strong class="jxr_keyword">private</strong> HTableDescriptor desc;
-<a class="jxr_linenumber" name="72" href="#72">72</a> <strong class="jxr_keyword">private</strong> String balancerName;
-<a class="jxr_linenumber" name="73" href="#73">73</a>
-<a class="jxr_linenumber" name="74" href="#74">74</a> <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/hadoop/hbase/TestRegionRebalancing.html">TestRegionRebalancing</a>(String balancerName) {
-<a class="jxr_linenumber" name="75" href="#75">75</a> <strong class="jxr_keyword">this</strong>.balancerName = balancerName;
-<a class="jxr_linenumber" name="76" href="#76">76</a>
-<a class="jxr_linenumber" name="77" href="#77">77</a> }
-<a class="jxr_linenumber" name="78" href="#78">78</a>
-<a class="jxr_linenumber" name="79" href="#79">79</a> @After
-<a class="jxr_linenumber" name="80" href="#80">80</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> after() <strong class="jxr_keyword">throws</strong> Exception {
-<a class="jxr_linenumber" name="81" href="#81">81</a> UTIL.shutdownMiniCluster();
-<a class="jxr_linenumber" name="82" href="#82">82</a> }
-<a class="jxr_linenumber" name="83" href="#83">83</a>
-<a class="jxr_linenumber" name="84" href="#84">84</a> @Before
-<a class="jxr_linenumber" name="85" href="#85">85</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> before() <strong class="jxr_keyword">throws</strong> Exception {
-<a class="jxr_linenumber" name="86" href="#86">86</a> UTIL.getConfiguration().set(<span class="jxr_string">"hbase.master.loadbalancer.class"</span>, <strong class="jxr_keyword">this</strong>.balancerName);
-<a class="jxr_linenumber" name="87" href="#87">87</a> <em class="jxr_comment">// set minCostNeedBalance to 0, make sure balancer run</em>
-<a class="jxr_linenumber" name="88" href="#88">88</a> UTIL.getConfiguration().setFloat(<span class="jxr_string">"hbase.master.balancer.stochastic.minCostNeedBalance"</span>, 0.0f);
-<a class="jxr_linenumber" name="89" href="#89">89</a> UTIL.startMiniCluster(1);
-<a class="jxr_linenumber" name="90" href="#90">90</a> <strong class="jxr_keyword">this</strong>.desc = <strong class="jxr_keyword">new</strong> HTableDescriptor(TableName.valueOf(<span class="jxr_string">"test"</span>));
-<a class="jxr_linenumber" name="91" href="#91">91</a> <strong class="jxr_keyword">this</strong>.desc.addFamily(<strong class="jxr_keyword">new</strong> HColumnDescriptor(FAMILY_NAME));
-<a class="jxr_linenumber" name="92" href="#92">92</a> }
-<a class="jxr_linenumber" name="93" href="#93">93</a>
-<a class="jxr_linenumber" name="94" href="#94">94</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="95" href="#95">95</a> <em class="jxr_javadoccomment"> * For HBASE-71. Try a few different configurations of starting and stopping</em>
-<a class="jxr_linenumber" name="96" href="#96">96</a> <em class="jxr_javadoccomment"> * region servers to see if the assignment or regions is pretty balanced.</em>
-<a class="jxr_linenumber" name="97" href="#97">97</a> <em class="jxr_javadoccomment"> * @throws IOException</em>
-<a class="jxr_linenumber" name="98" href="#98">98</a> <em class="jxr_javadoccomment"> * @throws InterruptedException</em>
-<a class="jxr_linenumber" name="99" href="#99">99</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="100" href="#100">100</a> @Test (timeout=300000)
-<a class="jxr_linenumber" name="101" href="#101">101</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testRebalanceOnRegionServerNumberChange()
-<a class="jxr_linenumber" name="102" href="#102">102</a> <strong class="jxr_keyword">throws</strong> IOException, InterruptedException {
-<a class="jxr_linenumber" name="103" href="#103">103</a> <strong class="jxr_keyword">try</strong>(Connection connection = ConnectionFactory.createConnection(UTIL.getConfiguration());
-<a class="jxr_linenumber" name="104" href="#104">104</a> Admin admin = connection.getAdmin()) {
-<a class="jxr_linenumber" name="105" href="#105">105</a> admin.createTable(<strong class="jxr_keyword">this</strong>.desc, Arrays.copyOfRange(HBaseTestingUtility.KEYS,
-<a class="jxr_linenumber" name="106" href="#106">106</a> 1, HBaseTestingUtility.KEYS.length));
-<a class="jxr_linenumber" name="107" href="#107">107</a> <strong class="jxr_keyword">this</strong>.regionLocator = connection.getRegionLocator(<strong class="jxr_keyword">this</strong>.desc.getTableName());
-<a class="jxr_linenumber" name="108" href="#108">108</a>
-<a class="jxr_linenumber" name="109" href="#109">109</a> MetaTableAccessor.fullScanMetaAndPrint(admin.getConnection());
-<a class="jxr_linenumber" name="110" href="#110">110</a>
-<a class="jxr_linenumber" name="111" href="#111">111</a> assertEquals(<span class="jxr_string">"Test table should have right number of regions"</span>,
-<a class="jxr_linenumber" name="112" href="#112">112</a> HBaseTestingUtility.KEYS.length,
-<a class="jxr_linenumber" name="113" href="#113">113</a> <strong class="jxr_keyword">this</strong>.regionLocator.getStartKeys().length);
-<a class="jxr_linenumber" name="114" href="#114">114</a>
-<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_comment">// verify that the region assignments are balanced to start out</em>
-<a class="jxr_linenumber" name="116" href="#116">116</a> assertRegionsAreBalanced();
-<a class="jxr_linenumber" name="117" href="#117">117</a>
-<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_comment">// add a region server - total of 2</em>
-<a class="jxr_linenumber" name="119" href="#119">119</a> LOG.info(<span class="jxr_string">"Started second server="</span> +
-<a class="jxr_linenumber" name="120" href="#120">120</a> UTIL.getHBaseCluster().startRegionServer().getRegionServer().getServerName());
-<a class="jxr_linenumber" name="121" href="#121">121</a> UTIL.getHBaseCluster().getMaster().balance();
-<a class="jxr_linenumber" name="122" href="#122">122</a> assertRegionsAreBalanced();
-<a class="jxr_linenumber" name="123" href="#123">123</a>
-<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_comment">// On a balanced cluster, calling balance() should return true</em>
-<a class="jxr_linenumber" name="125" href="#125">125</a> assert(UTIL.getHBaseCluster().getMaster().balance() == <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="126" href="#126">126</a>
-<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_comment">// if we add a server, then the balance() call should return true</em>
-<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_comment">// add a region server - total of 3</em>
-<a class="jxr_linenumber" name="129" href="#129">129</a> LOG.info(<span class="jxr_string">"Started third server="</span> +
-<a class="jxr_linenumber" name="130" href="#130">130</a> UTIL.getHBaseCluster().startRegionServer().getRegionServer().getServerName());
-<a class="jxr_linenumber" name="131" href="#131">131</a> assert(UTIL.getHBaseCluster().getMaster().balance() == <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="132" href="#132">132</a> assertRegionsAreBalanced();
-<a class="jxr_linenumber" name="133" href="#133">133</a>
-<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_comment">// kill a region server - total of 2</em>
-<a class="jxr_linenumber" name="135" href="#135">135</a> LOG.info(<span class="jxr_string">"Stopped third server="</span> + UTIL.getHBaseCluster().stopRegionServer(2, false));
-<a class="jxr_linenumber" name="136" href="#136">136</a> UTIL.getHBaseCluster().waitOnRegionServer(2);
-<a class="jxr_linenumber" name="137" href="#137">137</a> waitOnCrashProcessing();
-<a class="jxr_linenumber" name="138" href="#138">138</a> UTIL.getHBaseCluster().getMaster().balance();
-<a class="jxr_linenumber" name="139" href="#139">139</a> assertRegionsAreBalanced();
-<a class="jxr_linenumber" name="140" href="#140">140</a>
-<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_comment">// start two more region servers - total of 4</em>
-<a class="jxr_linenumber" name="142" href="#142">142</a> LOG.info(<span class="jxr_string">"Readding third server="</span> +
-<a class="jxr_linenumber" name="143" href="#143">143</a> UTIL.getHBaseCluster().startRegionServer().getRegionServer().getServerName());
-<a class="jxr_linenumber" name="144" href="#144">144</a> LOG.info(<span class="jxr_string">"Added fourth server="</span> +
-<a class="jxr_linenumber" name="145" href="#145">145</a> UTIL.getHBaseCluster().startRegionServer().getRegionServer().getServerName());
-<a class="jxr_linenumber" name="146" href="#146">146</a> waitOnCrashProcessing();
-<a class="jxr_linenumber" name="147" href="#147">147</a> assert(UTIL.getHBaseCluster().getMaster().balance() == <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="148" href="#148">148</a> assertRegionsAreBalanced();
-<a class="jxr_linenumber" name="149" href="#149">149</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i < 6; i++){
-<a class="jxr_linenumber" name="150" href="#150">150</a> LOG.info(<span class="jxr_string">"Adding "</span> + (i + 5) + <span class="jxr_string">"th region server"</span>);
-<a class="jxr_linenumber" name="151" href="#151">151</a> UTIL.getHBaseCluster().startRegionServer();
-<a class="jxr_linenumber" name="152" href="#152">152</a> }
-<a class="jxr_linenumber" name="153" href="#153">153</a> assert(UTIL.getHBaseCluster().getMaster().balance() == <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="154" href="#154">154</a> assertRegionsAreBalanced();
-<a class="jxr_linenumber" name="155" href="#155">155</a> regionLocator.close();
-<a class="jxr_linenumber" name="156" href="#156">156</a> }
-<a class="jxr_linenumber" name="157" href="#157">157</a> }
-<a class="jxr_linenumber" name="158" href="#158">158</a>
-<a class="jxr_linenumber" name="159" href="#159">159</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="160" href="#160">160</a> <em class="jxr_javadoccomment"> * Wait on crash processing. Balancer won't run if processing a crashed server.</em>
-<a class="jxr_linenumber" name="161" href="#161">161</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="162" href="#162">162</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> waitOnCrashProcessing() {
-<a class="jxr_linenumber" name="163" href="#163">163</a> <strong class="jxr_keyword">while</strong> (UTIL.getHBaseCluster().getMaster().getServerManager().areDeadServersInProgress()) {
-<a class="jxr_linenumber" name="164" href="#164">164</a> LOG.info(<span class="jxr_string">"Waiting on processing of crashed server before proceeding..."</span>);
-<a class="jxr_linenumber" name="165" href="#165">165</a> Threads.sleep(1000);
-<a class="jxr_linenumber" name="166" href="#166">166</a> }
-<a class="jxr_linenumber" name="167" href="#167">167</a> }
-<a class="jxr_linenumber" name="168" href="#168">168</a>
-<a class="jxr_linenumber" name="169" href="#169">169</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="170" href="#170">170</a> <em class="jxr_javadoccomment"> * Determine if regions are balanced. Figure out the total, divide by the</em>
-<a class="jxr_linenumber" name="171" href="#171">171</a> <em class="jxr_javadoccomment"> * number of online servers, then test if each server is +/- 1 of average</em>
-<a class="jxr_linenumber" name="172" href="#172">172</a> <em class="jxr_javadoccomment"> * rounded up.</em>
-<a class="jxr_linenumber" name="173" href="#173">173</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="174" href="#174">174</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> assertRegionsAreBalanced() <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="175" href="#175">175</a> <em class="jxr_comment">// TODO: Fix this test. Old balancer used to run with 'slop'. New</em>
-<a class="jxr_linenumber" name="176" href="#176">176</a> <em class="jxr_comment">// balancer does not.</em>
-<a class="jxr_linenumber" name="177" href="#177">177</a> <strong class="jxr_keyword">boolean</strong> success = false;
-<a class="jxr_linenumber" name="178" href="#178">178</a> <strong class="jxr_keyword">float</strong> slop = (<strong class="jxr_keyword">float</strong>)UTIL.getConfiguration().getFloat(<span class="jxr_string">"hbase.regions.slop"</span>, 0.1f);
-<a class="jxr_linenumber" name="179" href="#179">179</a> <strong class="jxr_keyword">if</strong> (slop <= 0) slop = 1;
-<a class="jxr_linenumber" name="180" href="#180">180</a>
-<a class="jxr_linenumber" name="181" href="#181">181</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i < 5; i++) {
-<a class="jxr_linenumber" name="182" href="#182">182</a> success = <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="183" href="#183">183</a> <em class="jxr_comment">// make sure all the regions are reassigned before we test balance</em>
-<a class="jxr_linenumber" name="184" href="#184">184</a> waitForAllRegionsAssigned();
-<a class="jxr_linenumber" name="185" href="#185">185</a>
-<a class="jxr_linenumber" name="186" href="#186">186</a> <strong class="jxr_keyword">long</strong> regionCount = UTIL.getMiniHBaseCluster().countServedRegions();
-<a class="jxr_linenumber" name="187" href="#187">187</a> List<HRegionServer> servers = getOnlineRegionServers();
-<a class="jxr_linenumber" name="188" href="#188">188</a> <strong class="jxr_keyword">double</strong> avg = UTIL.getHBaseCluster().getMaster().getAverageLoad();
-<a class="jxr_linenumber" name="189" href="#189">189</a> <strong class="jxr_keyword">int</strong> avgLoadPlusSlop = (<strong class="jxr_keyword">int</strong>)Math.ceil(avg * (1 + slop));
-<a class="jxr_linenumber" name="190" href="#190">190</a> <strong class="jxr_keyword">int</strong> avgLoadMinusSlop = (<strong class="jxr_keyword">int</strong>)Math.floor(avg * (1 - slop)) - 1;
-<a class="jxr_linenumber" name="191" href="#191">191</a> LOG.debug(<span class="jxr_string">"There are "</span> + servers.size() + <span class="jxr_string">" servers and "</span> + regionCount
-<a class="jxr_linenumber" name="192" href="#192">192</a> + <span class="jxr_string">" regions. Load Average: "</span> + avg + <span class="jxr_string">" low border: "</span> + avgLoadMinusSlop
-<a class="jxr_linenumber" name="193" href="#193">193</a> + <span class="jxr_string">", up border: "</span> + avgLoadPlusSlop + <span class="jxr_string">"; attempt: "</span> + i);
-<a class="jxr_linenumber" name="194" href="#194">194</a>
-<a class="jxr_linenumber" name="195" href="#195">195</a> <strong class="jxr_keyword">for</strong> (HRegionServer server : servers) {
-<a class="jxr_linenumber" name="196" href="#196">196</a> <strong class="jxr_keyword">int</strong> serverLoad =
-<a class="jxr_linenumber" name="197" href="#197">197</a> ProtobufUtil.getOnlineRegions(server.getRSRpcServices()).size();
-<a class="jxr_linenumber" name="198" href="#198">198</a> LOG.debug(server.getServerName() + <span class="jxr_string">" Avg: "</span> + avg + <span class="jxr_string">" actual: "</span> + serverLoad);
-<a class="jxr_linenumber" name="199" href="#199">199</a> <strong class="jxr_keyword">if</strong> (!(avg > 2.0 && serverLoad <= avgLoadPlusSlop
-<a class="jxr_linenumber" name="200" href="#200">200</a> && serverLoad >= avgLoadMinusSlop)) {
-<a class="jxr_linenumber" name="201" href="#201">201</a> <strong class="jxr_keyword">for</strong> (HRegionInfo hri :
-<a class="jxr_linenumber" name="202" href="#202">202</a> ProtobufUtil.getOnlineRegions(server.getRSRpcServices())) {
-<a class="jxr_linenumber" name="203" href="#203">203</a> <strong class="jxr_keyword">if</strong> (hri.isMetaRegion()) serverLoad--;
-<a class="jxr_linenumber" name="204" href="#204">204</a> <em class="jxr_comment">// LOG.debug(hri.getRegionNameAsString());</em>
-<a class="jxr_linenumber" name="205" href="#205">205</a> }
-<a class="jxr_linenumber" name="206" href="#206">206</a> <strong class="jxr_keyword">if</strong> (!(serverLoad <= avgLoadPlusSlop && serverLoad >= avgLoadMinusSlop)) {
-<a class="jxr_linenumber" name="207" href="#207">207</a> LOG.debug(server.getServerName() + <span class="jxr_string">" Isn't balanced!!! Avg: "</span> + avg +
-<a class="jxr_linenumber" name="208" href="#208">208</a> <span class="jxr_string">" actual: "</span> + serverLoad + <span class="jxr_string">" slop: "</span> + slop);
-<a class="jxr_linenumber" name="209" href="#209">209</a> success = false;
-<a class="jxr_linenumber" name="210" href="#210">210</a> <strong class="jxr_keyword">break</strong>;
-<a class="jxr_linenumber" name="211" href="#211">211</a> }
-<a class="jxr_linenumber" name="212" href="#212">212</a> }
-<a class="jxr_linenumber" name="213" href="#213">213</a> }
-<a class="jxr_linenumber" name="214" href="#214">214</a>
-<a class="jxr_linenumber" name="215" href="#215">215</a> <strong class="jxr_keyword">if</strong> (!success) {
-<a class="jxr_linenumber" name="216" href="#216">216</a> <em class="jxr_comment">// one or more servers are not balanced. sleep a little to give it a</em>
-<a class="jxr_linenumber" name="217" href="#217">217</a> <em class="jxr_comment">// chance to catch up. then, go back to the retry loop.</em>
-<a class="jxr_linenumber" name="218" href="#218">218</a> <strong class="jxr_keyword">try</strong> {
-<a class="jxr_linenumber" name="219" href="#219">219</a> Thread.sleep(10000);
-<a class="jxr_linenumber" name="220" href="#220">220</a> } <strong class="jxr_keyword">catch</strong> (InterruptedException e) {}
-<a class="jxr_linenumber" name="221" href="#221">221</a>
-<a class="jxr_linenumber" name="222" href="#222">222</a> UTIL.getHBaseCluster().getMaster().balance();
-<a class="jxr_linenumber" name="223" href="#223">223</a> <strong class="jxr_keyword">continue</strong>;
-<a class="jxr_linenumber" name="224" href="#224">224</a> }
-<a class="jxr_linenumber" name="225" href="#225">225</a>
-<a class="jxr_linenumber" name="226" href="#226">226</a> <em class="jxr_comment">// if we get here, all servers were balanced, so we should just return.</em>
-<a class="jxr_linenumber" name="227" href="#227">227</a> <strong class="jxr_keyword">return</strong>;
-<a class="jxr_linenumber" name="228" href="#228">228</a> }
-<a class="jxr_linenumber" name="229" href="#229">229</a> <em class="jxr_comment">// if we get here, we tried 5 times and never got to short circuit out of</em>
-<a class="jxr_linenumber" name="230" href="#230">230</a> <em class="jxr_comment">// the retry loop, so this is a failure.</em>
-<a class="jxr_linenumber" name="231" href="#231">231</a> fail(<span class="jxr_string">"After 5 attempts, region assignments were not balanced."</span>);
-<a class="jxr_linenumber" name="232" href="#232">232</a> }
-<a class="jxr_linenumber" name="233" href="#233">233</a>
-<a class="jxr_linenumber" name="234" href="#234">234</a> <strong class="jxr_keyword">private</strong> List<HRegionServer> getOnlineRegionServers() {
-<a class="jxr_linenumber" name="235" href="#235">235</a> List<HRegionServer> list = <strong class="jxr_keyword">new</strong> ArrayList<HRegionServer>();
-<a class="jxr_linenumber" name="236" href="#236">236</a> <strong class="jxr_keyword">for</strong> (JVMClusterUtil.RegionServerThread rst :
-<a class="jxr_linenumber" name="237" href="#237">237</a> UTIL.getHBaseCluster().getRegionServerThreads()) {
-<a class="jxr_linenumber" name="238" href="#238">238</a> <strong class="jxr_keyword">if</strong> (rst.getRegionServer().isOnline()) {
-<a class="jxr_linenumber" name="239" href="#239">239</a> list.add(rst.getRegionServer());
-<a class="jxr_linenumber" name="240" href="#240">240</a> }
-<a class="jxr_linenumber" name="241" href="#241">241</a> }
-<a class="jxr_linenumber" name="242" href="#242">242</a> <strong class="jxr_keyword">return</strong> list;
-<a class="jxr_linenumber" name="243" href="#243">243</a> }
-<a class="jxr_linenumber" name="244" href="#244">244</a>
-<a class="jxr_linenumber" name="245" href="#245">245</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="246" href="#246">246</a> <em class="jxr_javadoccomment"> * Wait until all the regions are assigned.</em>
-<a class="jxr_linenumber" name="247" href="#247">247</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="248" href="#248">248</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> waitForAllRegionsAssigned() <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="249" href="#249">249</a> <strong class="jxr_keyword">int</strong> totalRegions = HBaseTestingUtility.KEYS.length;
-<a class="jxr_linenumber" name="250" href="#250">250</a> <strong class="jxr_keyword">while</strong> (UTIL.getMiniHBaseCluster().countServedRegions() < totalRegions) {
-<a class="jxr_linenumber" name="251" href="#251">251</a> <em class="jxr_comment">// while (!cluster.getMaster().allRegionsAssigned()) {</em>
-<a class="jxr_linenumber" name="252" href="#252">252</a> LOG.debug(<span class="jxr_string">"Waiting for there to be "</span>+ totalRegions +<span class="jxr_string">" regions, but there are "</span>
-<a class="jxr_linenumber" name="253" href="#253">253</a> + UTIL.getMiniHBaseCluster().countServedRegions() + <span class="jxr_string">" right now."</span>);
-<a class="jxr_linenumber" name="254" href="#254">254</a> <strong class="jxr_keyword">try</strong> {
-<a class="jxr_linenumber" name="255" href="#255">255</a> Thread.sleep(200);
-<a class="jxr_linenumber" name="256" href="#256">256</a> } <strong class="jxr_keyword">catch</strong> (InterruptedException e) {}
-<a class="jxr_linenumber" name="257" href="#257">257</a> }
-<a class="jxr_linenumber" name="258" href="#258">258</a> UTIL.waitUntilNoRegionsInTransition();
-<a class="jxr_linenumber" name="259" href="#259">259</a> }
-<a class="jxr_linenumber" name="260" href="#260">260</a>
-<a class="jxr_linenumber" name="261" href="#261">261</a> }
-<a class="jxr_linenumber" name="262" href="#262">262</a>
-</pre>
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