http://git-wip-us.apache.org/repos/asf/hbase-site/blob/a719cd00/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.CandidateGenerator.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.CandidateGenerator.html b/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.CandidateGenerator.html index 6de986f..c895448 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.CandidateGenerator.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.CandidateGenerator.html @@ -26,1592 +26,1693 @@ <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.master.balancer;<a name="line.18"></a> <span class="sourceLineNo">019</span><a name="line.19"></a> <span class="sourceLineNo">020</span>import java.util.ArrayDeque;<a name="line.20"></a> -<span class="sourceLineNo">021</span>import java.util.Arrays;<a name="line.21"></a> -<span class="sourceLineNo">022</span>import java.util.Collection;<a name="line.22"></a> -<span class="sourceLineNo">023</span>import java.util.Deque;<a name="line.23"></a> -<span class="sourceLineNo">024</span>import java.util.HashMap;<a name="line.24"></a> -<span class="sourceLineNo">025</span>import java.util.LinkedList;<a name="line.25"></a> -<span class="sourceLineNo">026</span>import java.util.List;<a name="line.26"></a> -<span class="sourceLineNo">027</span>import java.util.Map;<a name="line.27"></a> -<span class="sourceLineNo">028</span>import java.util.Map.Entry;<a name="line.28"></a> -<span class="sourceLineNo">029</span>import java.util.Random;<a name="line.29"></a> -<span class="sourceLineNo">030</span><a name="line.30"></a> -<span class="sourceLineNo">031</span>import org.apache.commons.logging.Log;<a name="line.31"></a> -<span class="sourceLineNo">032</span>import org.apache.commons.logging.LogFactory;<a name="line.32"></a> -<span class="sourceLineNo">033</span>import org.apache.hadoop.conf.Configuration;<a name="line.33"></a> -<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.ClusterStatus;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.HBaseInterfaceAudience;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.HConstants;<a name="line.36"></a> -<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.HRegionInfo;<a name="line.37"></a> -<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.RegionLoad;<a name="line.38"></a> -<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.ServerLoad;<a name="line.39"></a> -<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.ServerName;<a name="line.40"></a> -<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.TableName;<a name="line.41"></a> -<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.42"></a> -<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.master.MasterServices;<a name="line.43"></a> -<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.master.RegionPlan;<a name="line.44"></a> -<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.Action;<a name="line.45"></a> -<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.Action.Type;<a name="line.46"></a> -<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.AssignRegionAction;<a name="line.47"></a> -<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.MoveRegionAction;<a name="line.48"></a> -<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.SwapRegionsAction;<a name="line.49"></a> -<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.50"></a> -<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.51"></a> -<span class="sourceLineNo">052</span><a name="line.52"></a> -<span class="sourceLineNo">053</span>import com.google.common.collect.Lists;<a name="line.53"></a> -<span class="sourceLineNo">054</span><a name="line.54"></a> -<span class="sourceLineNo">055</span>/**<a name="line.55"></a> -<span class="sourceLineNo">056</span> * <p>This is a best effort load balancer. Given a Cost function F(C) =&gt; x It will<a name="line.56"></a> -<span class="sourceLineNo">057</span> * randomly try and mutate the cluster to Cprime. If F(Cprime) &lt; F(C) then the<a name="line.57"></a> -<span class="sourceLineNo">058</span> * new cluster state becomes the plan. It includes costs functions to compute the cost of:</p><a name="line.58"></a> -<span class="sourceLineNo">059</span> * <ul><a name="line.59"></a> -<span class="sourceLineNo">060</span> * <li>Region Load</li><a name="line.60"></a> -<span class="sourceLineNo">061</span> * <li>Table Load</li><a name="line.61"></a> -<span class="sourceLineNo">062</span> * <li>Data Locality</li><a name="line.62"></a> -<span class="sourceLineNo">063</span> * <li>Memstore Sizes</li><a name="line.63"></a> -<span class="sourceLineNo">064</span> * <li>Storefile Sizes</li><a name="line.64"></a> -<span class="sourceLineNo">065</span> * </ul><a name="line.65"></a> -<span class="sourceLineNo">066</span> *<a name="line.66"></a> -<span class="sourceLineNo">067</span> *<a name="line.67"></a> -<span class="sourceLineNo">068</span> * <p>Every cost function returns a number between 0 and 1 inclusive; where 0 is the lowest cost<a name="line.68"></a> -<span class="sourceLineNo">069</span> * best solution, and 1 is the highest possible cost and the worst solution. The computed costs are<a name="line.69"></a> -<span class="sourceLineNo">070</span> * scaled by their respective multipliers:</p><a name="line.70"></a> +<span class="sourceLineNo">021</span>import java.util.ArrayList;<a name="line.21"></a> +<span class="sourceLineNo">022</span>import java.util.Arrays;<a name="line.22"></a> +<span class="sourceLineNo">023</span>import java.util.Collection;<a name="line.23"></a> +<span class="sourceLineNo">024</span>import java.util.Collections;<a name="line.24"></a> +<span class="sourceLineNo">025</span>import java.util.Deque;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import java.util.HashMap;<a name="line.26"></a> +<span class="sourceLineNo">027</span>import java.util.LinkedList;<a name="line.27"></a> +<span class="sourceLineNo">028</span>import java.util.List;<a name="line.28"></a> +<span class="sourceLineNo">029</span>import java.util.Map;<a name="line.29"></a> +<span class="sourceLineNo">030</span>import java.util.Map.Entry;<a name="line.30"></a> +<span class="sourceLineNo">031</span>import java.util.Random;<a name="line.31"></a> +<span class="sourceLineNo">032</span><a name="line.32"></a> +<span class="sourceLineNo">033</span>import org.apache.commons.logging.Log;<a name="line.33"></a> +<span class="sourceLineNo">034</span>import org.apache.commons.logging.LogFactory;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import org.apache.hadoop.conf.Configuration;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.ClusterStatus;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.HBaseInterfaceAudience;<a name="line.37"></a> +<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.HConstants;<a name="line.38"></a> +<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.HRegionInfo;<a name="line.39"></a> +<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.RegionLoad;<a name="line.40"></a> +<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.ServerLoad;<a name="line.41"></a> +<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.ServerName;<a name="line.42"></a> +<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.TableName;<a name="line.43"></a> +<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.44"></a> +<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.master.MasterServices;<a name="line.45"></a> +<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.master.RegionPlan;<a name="line.46"></a> +<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.Action;<a name="line.47"></a> +<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.Action.Type;<a name="line.48"></a> +<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.AssignRegionAction;<a name="line.49"></a> +<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.LocalityType;<a name="line.50"></a> +<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.MoveRegionAction;<a name="line.51"></a> +<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.SwapRegionsAction;<a name="line.52"></a> +<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.53"></a> +<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.54"></a> +<span class="sourceLineNo">055</span><a name="line.55"></a> +<span class="sourceLineNo">056</span>import com.google.common.base.Optional;<a name="line.56"></a> +<span class="sourceLineNo">057</span>import com.google.common.collect.Lists;<a name="line.57"></a> +<span class="sourceLineNo">058</span><a name="line.58"></a> +<span class="sourceLineNo">059</span>/**<a name="line.59"></a> +<span class="sourceLineNo">060</span> * <p>This is a best effort load balancer. Given a Cost function F(C) =&gt; x It will<a name="line.60"></a> +<span class="sourceLineNo">061</span> * randomly try and mutate the cluster to Cprime. If F(Cprime) &lt; F(C) then the<a name="line.61"></a> +<span class="sourceLineNo">062</span> * new cluster state becomes the plan. It includes costs functions to compute the cost of:</p><a name="line.62"></a> +<span class="sourceLineNo">063</span> * <ul><a name="line.63"></a> +<span class="sourceLineNo">064</span> * <li>Region Load</li><a name="line.64"></a> +<span class="sourceLineNo">065</span> * <li>Table Load</li><a name="line.65"></a> +<span class="sourceLineNo">066</span> * <li>Data Locality</li><a name="line.66"></a> +<span class="sourceLineNo">067</span> * <li>Memstore Sizes</li><a name="line.67"></a> +<span class="sourceLineNo">068</span> * <li>Storefile Sizes</li><a name="line.68"></a> +<span class="sourceLineNo">069</span> * </ul><a name="line.69"></a> +<span class="sourceLineNo">070</span> *<a name="line.70"></a> <span class="sourceLineNo">071</span> *<a name="line.71"></a> -<span class="sourceLineNo">072</span> * <ul><a name="line.72"></a> -<span class="sourceLineNo">073</span> * <li>hbase.master.balancer.stochastic.regionLoadCost</li><a name="line.73"></a> -<span class="sourceLineNo">074</span> * <li>hbase.master.balancer.stochastic.moveCost</li><a name="line.74"></a> -<span class="sourceLineNo">075</span> * <li>hbase.master.balancer.stochastic.tableLoadCost</li><a name="line.75"></a> -<span class="sourceLineNo">076</span> * <li>hbase.master.balancer.stochastic.localityCost</li><a name="line.76"></a> -<span class="sourceLineNo">077</span> * <li>hbase.master.balancer.stochastic.memstoreSizeCost</li><a name="line.77"></a> -<span class="sourceLineNo">078</span> * <li>hbase.master.balancer.stochastic.storefileSizeCost</li><a name="line.78"></a> -<span class="sourceLineNo">079</span> * </ul><a name="line.79"></a> -<span class="sourceLineNo">080</span> *<a name="line.80"></a> -<span class="sourceLineNo">081</span> * <p>In addition to the above configurations, the balancer can be tuned by the following<a name="line.81"></a> -<span class="sourceLineNo">082</span> * configuration values:</p><a name="line.82"></a> -<span class="sourceLineNo">083</span> * <ul><a name="line.83"></a> -<span class="sourceLineNo">084</span> * <li>hbase.master.balancer.stochastic.maxMoveRegions which<a name="line.84"></a> -<span class="sourceLineNo">085</span> * controls what the max number of regions that can be moved in a single invocation of this<a name="line.85"></a> -<span class="sourceLineNo">086</span> * balancer.</li><a name="line.86"></a> -<span class="sourceLineNo">087</span> * <li>hbase.master.balancer.stochastic.stepsPerRegion is the coefficient by which the number of<a name="line.87"></a> -<span class="sourceLineNo">088</span> * regions is multiplied to try and get the number of times the balancer will<a name="line.88"></a> -<span class="sourceLineNo">089</span> * mutate all servers.</li><a name="line.89"></a> -<span class="sourceLineNo">090</span> * <li>hbase.master.balancer.stochastic.maxSteps which controls the maximum number of times that<a name="line.90"></a> -<span class="sourceLineNo">091</span> * the balancer will try and mutate all the servers. The balancer will use the minimum of this<a name="line.91"></a> -<span class="sourceLineNo">092</span> * value and the above computation.</li><a name="line.92"></a> -<span class="sourceLineNo">093</span> * </ul><a name="line.93"></a> -<span class="sourceLineNo">094</span> *<a name="line.94"></a> -<span class="sourceLineNo">095</span> * <p>This balancer is best used with hbase.master.loadbalance.bytable set to false<a name="line.95"></a> -<span class="sourceLineNo">096</span> * so that the balancer gets the full picture of all loads on the cluster.</p><a name="line.96"></a> -<span class="sourceLineNo">097</span> */<a name="line.97"></a> -<span class="sourceLineNo">098</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a name="line.98"></a> -<span class="sourceLineNo">099</span>@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="IS2_INCONSISTENT_SYNC",<a name="line.99"></a> -<span class="sourceLineNo">100</span> justification="Complaint is about costFunctions not being synchronized; not end of the world")<a name="line.100"></a> -<span class="sourceLineNo">101</span>public class StochasticLoadBalancer extends BaseLoadBalancer {<a name="line.101"></a> -<span class="sourceLineNo">102</span><a name="line.102"></a> -<span class="sourceLineNo">103</span> protected static final String STEPS_PER_REGION_KEY =<a name="line.103"></a> -<span class="sourceLineNo">104</span> "hbase.master.balancer.stochastic.stepsPerRegion";<a name="line.104"></a> -<span class="sourceLineNo">105</span> protected static final String MAX_STEPS_KEY =<a name="line.105"></a> -<span class="sourceLineNo">106</span> "hbase.master.balancer.stochastic.maxSteps";<a name="line.106"></a> -<span class="sourceLineNo">107</span> protected static final String RUN_MAX_STEPS_KEY =<a name="line.107"></a> -<span class="sourceLineNo">108</span> "hbase.master.balancer.stochastic.runMaxSteps";<a name="line.108"></a> -<span class="sourceLineNo">109</span> protected static final String MAX_RUNNING_TIME_KEY =<a name="line.109"></a> -<span class="sourceLineNo">110</span> "hbase.master.balancer.stochastic.maxRunningTime";<a name="line.110"></a> -<span class="sourceLineNo">111</span> protected static final String KEEP_REGION_LOADS =<a name="line.111"></a> -<span class="sourceLineNo">112</span> "hbase.master.balancer.stochastic.numRegionLoadsToRemember";<a name="line.112"></a> -<span class="sourceLineNo">113</span> private static final String TABLE_FUNCTION_SEP = "_";<a name="line.113"></a> -<span class="sourceLineNo">114</span> protected static final String MIN_COST_NEED_BALANCE_KEY =<a name="line.114"></a> -<span class="sourceLineNo">115</span> "hbase.master.balancer.stochastic.minCostNeedBalance";<a name="line.115"></a> -<span class="sourceLineNo">116</span><a name="line.116"></a> -<span class="sourceLineNo">117</span> protected static final Random RANDOM = new Random(System.currentTimeMillis());<a name="line.117"></a> -<span class="sourceLineNo">118</span> private static final Log LOG = LogFactory.getLog(StochasticLoadBalancer.class);<a name="line.118"></a> -<span class="sourceLineNo">119</span><a name="line.119"></a> -<span class="sourceLineNo">120</span> Map<String, Deque<BalancerRegionLoad>> loads = new HashMap<>();<a name="line.120"></a> -<span class="sourceLineNo">121</span><a name="line.121"></a> -<span class="sourceLineNo">122</span> // values are defaults<a name="line.122"></a> -<span class="sourceLineNo">123</span> private int maxSteps = 1000000;<a name="line.123"></a> -<span class="sourceLineNo">124</span> private boolean runMaxSteps = false;<a name="line.124"></a> -<span class="sourceLineNo">125</span> private int stepsPerRegion = 800;<a name="line.125"></a> -<span class="sourceLineNo">126</span> private long maxRunningTime = 30 * 1000 * 1; // 30 seconds.<a name="line.126"></a> -<span class="sourceLineNo">127</span> private int numRegionLoadsToRemember = 15;<a name="line.127"></a> -<span class="sourceLineNo">128</span> private float minCostNeedBalance = 0.05f;<a name="line.128"></a> -<span class="sourceLineNo">129</span><a name="line.129"></a> -<span class="sourceLineNo">130</span> private List<CandidateGenerator> candidateGenerators;<a name="line.130"></a> -<span class="sourceLineNo">131</span> private CostFromRegionLoadFunction[] regionLoadFunctions;<a name="line.131"></a> -<span class="sourceLineNo">132</span> private CostFunction[] costFunctions; // FindBugs: Wants this protected; IS2_INCONSISTENT_SYNC<a name="line.132"></a> +<span class="sourceLineNo">072</span> * <p>Every cost function returns a number between 0 and 1 inclusive; where 0 is the lowest cost<a name="line.72"></a> +<span class="sourceLineNo">073</span> * best solution, and 1 is the highest possible cost and the worst solution. The computed costs are<a name="line.73"></a> +<span class="sourceLineNo">074</span> * scaled by their respective multipliers:</p><a name="line.74"></a> +<span class="sourceLineNo">075</span> *<a name="line.75"></a> +<span class="sourceLineNo">076</span> * <ul><a name="line.76"></a> +<span class="sourceLineNo">077</span> * <li>hbase.master.balancer.stochastic.regionLoadCost</li><a name="line.77"></a> +<span class="sourceLineNo">078</span> * <li>hbase.master.balancer.stochastic.moveCost</li><a name="line.78"></a> +<span class="sourceLineNo">079</span> * <li>hbase.master.balancer.stochastic.tableLoadCost</li><a name="line.79"></a> +<span class="sourceLineNo">080</span> * <li>hbase.master.balancer.stochastic.localityCost</li><a name="line.80"></a> +<span class="sourceLineNo">081</span> * <li>hbase.master.balancer.stochastic.memstoreSizeCost</li><a name="line.81"></a> +<span class="sourceLineNo">082</span> * <li>hbase.master.balancer.stochastic.storefileSizeCost</li><a name="line.82"></a> +<span class="sourceLineNo">083</span> * </ul><a name="line.83"></a> +<span class="sourceLineNo">084</span> *<a name="line.84"></a> +<span class="sourceLineNo">085</span> * <p>In addition to the above configurations, the balancer can be tuned by the following<a name="line.85"></a> +<span class="sourceLineNo">086</span> * configuration values:</p><a name="line.86"></a> +<span class="sourceLineNo">087</span> * <ul><a name="line.87"></a> +<span class="sourceLineNo">088</span> * <li>hbase.master.balancer.stochastic.maxMoveRegions which<a name="line.88"></a> +<span class="sourceLineNo">089</span> * controls what the max number of regions that can be moved in a single invocation of this<a name="line.89"></a> +<span class="sourceLineNo">090</span> * balancer.</li><a name="line.90"></a> +<span class="sourceLineNo">091</span> * <li>hbase.master.balancer.stochastic.stepsPerRegion is the coefficient by which the number of<a name="line.91"></a> +<span class="sourceLineNo">092</span> * regions is multiplied to try and get the number of times the balancer will<a name="line.92"></a> +<span class="sourceLineNo">093</span> * mutate all servers.</li><a name="line.93"></a> +<span class="sourceLineNo">094</span> * <li>hbase.master.balancer.stochastic.maxSteps which controls the maximum number of times that<a name="line.94"></a> +<span class="sourceLineNo">095</span> * the balancer will try and mutate all the servers. The balancer will use the minimum of this<a name="line.95"></a> +<span class="sourceLineNo">096</span> * value and the above computation.</li><a name="line.96"></a> +<span class="sourceLineNo">097</span> * </ul><a name="line.97"></a> +<span class="sourceLineNo">098</span> *<a name="line.98"></a> +<span class="sourceLineNo">099</span> * <p>This balancer is best used with hbase.master.loadbalance.bytable set to false<a name="line.99"></a> +<span class="sourceLineNo">100</span> * so that the balancer gets the full picture of all loads on the cluster.</p><a name="line.100"></a> +<span class="sourceLineNo">101</span> */<a name="line.101"></a> +<span class="sourceLineNo">102</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a name="line.102"></a> +<span class="sourceLineNo">103</span>@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="IS2_INCONSISTENT_SYNC",<a name="line.103"></a> +<span class="sourceLineNo">104</span> justification="Complaint is about costFunctions not being synchronized; not end of the world")<a name="line.104"></a> +<span class="sourceLineNo">105</span>public class StochasticLoadBalancer extends BaseLoadBalancer {<a name="line.105"></a> +<span class="sourceLineNo">106</span><a name="line.106"></a> +<span class="sourceLineNo">107</span> protected static final String STEPS_PER_REGION_KEY =<a name="line.107"></a> +<span class="sourceLineNo">108</span> "hbase.master.balancer.stochastic.stepsPerRegion";<a name="line.108"></a> +<span class="sourceLineNo">109</span> protected static final String MAX_STEPS_KEY =<a name="line.109"></a> +<span class="sourceLineNo">110</span> "hbase.master.balancer.stochastic.maxSteps";<a name="line.110"></a> +<span class="sourceLineNo">111</span> protected static final String RUN_MAX_STEPS_KEY =<a name="line.111"></a> +<span class="sourceLineNo">112</span> "hbase.master.balancer.stochastic.runMaxSteps";<a name="line.112"></a> +<span class="sourceLineNo">113</span> protected static final String MAX_RUNNING_TIME_KEY =<a name="line.113"></a> +<span class="sourceLineNo">114</span> "hbase.master.balancer.stochastic.maxRunningTime";<a name="line.114"></a> +<span class="sourceLineNo">115</span> protected static final String KEEP_REGION_LOADS =<a name="line.115"></a> +<span class="sourceLineNo">116</span> "hbase.master.balancer.stochastic.numRegionLoadsToRemember";<a name="line.116"></a> +<span class="sourceLineNo">117</span> private static final String TABLE_FUNCTION_SEP = "_";<a name="line.117"></a> +<span class="sourceLineNo">118</span> protected static final String MIN_COST_NEED_BALANCE_KEY =<a name="line.118"></a> +<span class="sourceLineNo">119</span> "hbase.master.balancer.stochastic.minCostNeedBalance";<a name="line.119"></a> +<span class="sourceLineNo">120</span><a name="line.120"></a> +<span class="sourceLineNo">121</span> protected static final Random RANDOM = new Random(System.currentTimeMillis());<a name="line.121"></a> +<span class="sourceLineNo">122</span> private static final Log LOG = LogFactory.getLog(StochasticLoadBalancer.class);<a name="line.122"></a> +<span class="sourceLineNo">123</span><a name="line.123"></a> +<span class="sourceLineNo">124</span> Map<String, Deque<BalancerRegionLoad>> loads = new HashMap<>();<a name="line.124"></a> +<span class="sourceLineNo">125</span><a name="line.125"></a> +<span class="sourceLineNo">126</span> // values are defaults<a name="line.126"></a> +<span class="sourceLineNo">127</span> private int maxSteps = 1000000;<a name="line.127"></a> +<span class="sourceLineNo">128</span> private boolean runMaxSteps = false;<a name="line.128"></a> +<span class="sourceLineNo">129</span> private int stepsPerRegion = 800;<a name="line.129"></a> +<span class="sourceLineNo">130</span> private long maxRunningTime = 30 * 1000 * 1; // 30 seconds.<a name="line.130"></a> +<span class="sourceLineNo">131</span> private int numRegionLoadsToRemember = 15;<a name="line.131"></a> +<span class="sourceLineNo">132</span> private float minCostNeedBalance = 0.05f;<a name="line.132"></a> <span class="sourceLineNo">133</span><a name="line.133"></a> -<span class="sourceLineNo">134</span> // to save and report costs to JMX<a name="line.134"></a> -<span class="sourceLineNo">135</span> private Double curOverallCost = 0d;<a name="line.135"></a> -<span class="sourceLineNo">136</span> private Double[] tempFunctionCosts;<a name="line.136"></a> -<span class="sourceLineNo">137</span> private Double[] curFunctionCosts;<a name="line.137"></a> -<span class="sourceLineNo">138</span><a name="line.138"></a> -<span class="sourceLineNo">139</span> // Keep locality based picker and cost function to alert them<a name="line.139"></a> -<span class="sourceLineNo">140</span> // when new services are offered<a name="line.140"></a> -<span class="sourceLineNo">141</span> private LocalityBasedCandidateGenerator localityCandidateGenerator;<a name="line.141"></a> -<span class="sourceLineNo">142</span> private LocalityCostFunction localityCost;<a name="line.142"></a> -<span class="sourceLineNo">143</span> private RegionReplicaHostCostFunction regionReplicaHostCostFunction;<a name="line.143"></a> -<span class="sourceLineNo">144</span> private RegionReplicaRackCostFunction regionReplicaRackCostFunction;<a name="line.144"></a> -<span class="sourceLineNo">145</span> private boolean isByTable = false;<a name="line.145"></a> -<span class="sourceLineNo">146</span> private TableName tableName = null;<a name="line.146"></a> -<span class="sourceLineNo">147</span><a name="line.147"></a> -<span class="sourceLineNo">148</span> /**<a name="line.148"></a> -<span class="sourceLineNo">149</span> * The constructor that pass a MetricsStochasticBalancer to BaseLoadBalancer to replace its<a name="line.149"></a> -<span class="sourceLineNo">150</span> * default MetricsBalancer<a name="line.150"></a> -<span class="sourceLineNo">151</span> */<a name="line.151"></a> -<span class="sourceLineNo">152</span> public StochasticLoadBalancer() {<a name="line.152"></a> -<span class="sourceLineNo">153</span> super(new MetricsStochasticBalancer());<a name="line.153"></a> -<span class="sourceLineNo">154</span> }<a name="line.154"></a> -<span class="sourceLineNo">155</span><a name="line.155"></a> -<span class="sourceLineNo">156</span> @Override<a name="line.156"></a> -<span class="sourceLineNo">157</span> public void onConfigurationChange(Configuration conf) {<a name="line.157"></a> -<span class="sourceLineNo">158</span> setConf(conf);<a name="line.158"></a> +<span class="sourceLineNo">134</span> private List<CandidateGenerator> candidateGenerators;<a name="line.134"></a> +<span class="sourceLineNo">135</span> private CostFromRegionLoadFunction[] regionLoadFunctions;<a name="line.135"></a> +<span class="sourceLineNo">136</span> private CostFunction[] costFunctions; // FindBugs: Wants this protected; IS2_INCONSISTENT_SYNC<a name="line.136"></a> +<span class="sourceLineNo">137</span><a name="line.137"></a> +<span class="sourceLineNo">138</span> // to save and report costs to JMX<a name="line.138"></a> +<span class="sourceLineNo">139</span> private Double curOverallCost = 0d;<a name="line.139"></a> +<span class="sourceLineNo">140</span> private Double[] tempFunctionCosts;<a name="line.140"></a> +<span class="sourceLineNo">141</span> private Double[] curFunctionCosts;<a name="line.141"></a> +<span class="sourceLineNo">142</span><a name="line.142"></a> +<span class="sourceLineNo">143</span> // Keep locality based picker and cost function to alert them<a name="line.143"></a> +<span class="sourceLineNo">144</span> // when new services are offered<a name="line.144"></a> +<span class="sourceLineNo">145</span> private LocalityBasedCandidateGenerator localityCandidateGenerator;<a name="line.145"></a> +<span class="sourceLineNo">146</span> private ServerLocalityCostFunction localityCost;<a name="line.146"></a> +<span class="sourceLineNo">147</span> private RackLocalityCostFunction rackLocalityCost;<a name="line.147"></a> +<span class="sourceLineNo">148</span> private RegionReplicaHostCostFunction regionReplicaHostCostFunction;<a name="line.148"></a> +<span class="sourceLineNo">149</span> private RegionReplicaRackCostFunction regionReplicaRackCostFunction;<a name="line.149"></a> +<span class="sourceLineNo">150</span> private boolean isByTable = false;<a name="line.150"></a> +<span class="sourceLineNo">151</span> private TableName tableName = null;<a name="line.151"></a> +<span class="sourceLineNo">152</span><a name="line.152"></a> +<span class="sourceLineNo">153</span> /**<a name="line.153"></a> +<span class="sourceLineNo">154</span> * The constructor that pass a MetricsStochasticBalancer to BaseLoadBalancer to replace its<a name="line.154"></a> +<span class="sourceLineNo">155</span> * default MetricsBalancer<a name="line.155"></a> +<span class="sourceLineNo">156</span> */<a name="line.156"></a> +<span class="sourceLineNo">157</span> public StochasticLoadBalancer() {<a name="line.157"></a> +<span class="sourceLineNo">158</span> super(new MetricsStochasticBalancer());<a name="line.158"></a> <span class="sourceLineNo">159</span> }<a name="line.159"></a> <span class="sourceLineNo">160</span><a name="line.160"></a> <span class="sourceLineNo">161</span> @Override<a name="line.161"></a> -<span class="sourceLineNo">162</span> public synchronized void setConf(Configuration conf) {<a name="line.162"></a> -<span class="sourceLineNo">163</span> super.setConf(conf);<a name="line.163"></a> -<span class="sourceLineNo">164</span> maxSteps = conf.getInt(MAX_STEPS_KEY, maxSteps);<a name="line.164"></a> -<span class="sourceLineNo">165</span> stepsPerRegion = conf.getInt(STEPS_PER_REGION_KEY, stepsPerRegion);<a name="line.165"></a> -<span class="sourceLineNo">166</span> maxRunningTime = conf.getLong(MAX_RUNNING_TIME_KEY, maxRunningTime);<a name="line.166"></a> -<span class="sourceLineNo">167</span> runMaxSteps = conf.getBoolean(RUN_MAX_STEPS_KEY, runMaxSteps);<a name="line.167"></a> -<span class="sourceLineNo">168</span><a name="line.168"></a> -<span class="sourceLineNo">169</span> numRegionLoadsToRemember = conf.getInt(KEEP_REGION_LOADS, numRegionLoadsToRemember);<a name="line.169"></a> -<span class="sourceLineNo">170</span> isByTable = conf.getBoolean(HConstants.HBASE_MASTER_LOADBALANCE_BYTABLE, isByTable);<a name="line.170"></a> -<span class="sourceLineNo">171</span> minCostNeedBalance = conf.getFloat(MIN_COST_NEED_BALANCE_KEY, minCostNeedBalance);<a name="line.171"></a> -<span class="sourceLineNo">172</span> if (localityCandidateGenerator == null) {<a name="line.172"></a> -<span class="sourceLineNo">173</span> localityCandidateGenerator = new LocalityBasedCandidateGenerator(services);<a name="line.173"></a> -<span class="sourceLineNo">174</span> }<a name="line.174"></a> -<span class="sourceLineNo">175</span> localityCost = new LocalityCostFunction(conf, services);<a name="line.175"></a> -<span class="sourceLineNo">176</span><a name="line.176"></a> -<span class="sourceLineNo">177</span> if (this.candidateGenerators == null) {<a name="line.177"></a> -<span class="sourceLineNo">178</span> candidateGenerators = Lists.newArrayList();<a name="line.178"></a> -<span class="sourceLineNo">179</span> candidateGenerators.add(new RandomCandidateGenerator());<a name="line.179"></a> -<span class="sourceLineNo">180</span> candidateGenerators.add(new LoadCandidateGenerator());<a name="line.180"></a> -<span class="sourceLineNo">181</span> candidateGenerators.add(localityCandidateGenerator);<a name="line.181"></a> -<span class="sourceLineNo">182</span> candidateGenerators.add(new RegionReplicaRackCandidateGenerator());<a name="line.182"></a> -<span class="sourceLineNo">183</span> }<a name="line.183"></a> -<span class="sourceLineNo">184</span> regionLoadFunctions = new CostFromRegionLoadFunction[] {<a name="line.184"></a> -<span class="sourceLineNo">185</span> new ReadRequestCostFunction(conf),<a name="line.185"></a> -<span class="sourceLineNo">186</span> new WriteRequestCostFunction(conf),<a name="line.186"></a> -<span class="sourceLineNo">187</span> new MemstoreSizeCostFunction(conf),<a name="line.187"></a> -<span class="sourceLineNo">188</span> new StoreFileCostFunction(conf)<a name="line.188"></a> -<span class="sourceLineNo">189</span> };<a name="line.189"></a> -<span class="sourceLineNo">190</span> regionReplicaHostCostFunction = new RegionReplicaHostCostFunction(conf);<a name="line.190"></a> -<span class="sourceLineNo">191</span> regionReplicaRackCostFunction = new RegionReplicaRackCostFunction(conf);<a name="line.191"></a> -<span class="sourceLineNo">192</span> costFunctions = new CostFunction[]{<a name="line.192"></a> -<span class="sourceLineNo">193</span> new RegionCountSkewCostFunction(conf),<a name="line.193"></a> -<span class="sourceLineNo">194</span> new PrimaryRegionCountSkewCostFunction(conf),<a name="line.194"></a> -<span class="sourceLineNo">195</span> new MoveCostFunction(conf),<a name="line.195"></a> -<span class="sourceLineNo">196</span> localityCost,<a name="line.196"></a> -<span class="sourceLineNo">197</span> new TableSkewCostFunction(conf),<a name="line.197"></a> -<span class="sourceLineNo">198</span> regionReplicaHostCostFunction,<a name="line.198"></a> -<span class="sourceLineNo">199</span> regionReplicaRackCostFunction,<a name="line.199"></a> -<span class="sourceLineNo">200</span> regionLoadFunctions[0],<a name="line.200"></a> -<span class="sourceLineNo">201</span> regionLoadFunctions[1],<a name="line.201"></a> -<span class="sourceLineNo">202</span> regionLoadFunctions[2],<a name="line.202"></a> -<span class="sourceLineNo">203</span> regionLoadFunctions[3],<a name="line.203"></a> -<span class="sourceLineNo">204</span> };<a name="line.204"></a> -<span class="sourceLineNo">205</span> curFunctionCosts= new Double[costFunctions.length];<a name="line.205"></a> -<span class="sourceLineNo">206</span> tempFunctionCosts= new Double[costFunctions.length];<a name="line.206"></a> -<span class="sourceLineNo">207</span> LOG.info("Loaded config; maxSteps=" + maxSteps + ", stepsPerRegion=" + stepsPerRegion +<a name="line.207"></a> -<span class="sourceLineNo">208</span> ", maxRunningTime=" + maxRunningTime + ", isByTable=" + isByTable + ", etc.");<a name="line.208"></a> -<span class="sourceLineNo">209</span> }<a name="line.209"></a> -<span class="sourceLineNo">210</span><a name="line.210"></a> -<span class="sourceLineNo">211</span> protected void setCandidateGenerators(List<CandidateGenerator> customCandidateGenerators) {<a name="line.211"></a> -<span class="sourceLineNo">212</span> this.candidateGenerators = customCandidateGenerators;<a name="line.212"></a> -<span class="sourceLineNo">213</span> }<a name="line.213"></a> -<span class="sourceLineNo">214</span><a name="line.214"></a> -<span class="sourceLineNo">215</span> @Override<a name="line.215"></a> -<span class="sourceLineNo">216</span> protected void setSlop(Configuration conf) {<a 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class="sourceLineNo">228</span> // update metrics size<a name="line.228"></a> -<span class="sourceLineNo">229</span> try {<a name="line.229"></a> -<span class="sourceLineNo">230</span> // by-table or ensemble mode<a name="line.230"></a> -<span class="sourceLineNo">231</span> int tablesCount = isByTable ? services.getTableDescriptors().getAll().size() : 1;<a name="line.231"></a> -<span class="sourceLineNo">232</span> int functionsCount = getCostFunctionNames().length;<a name="line.232"></a> -<span class="sourceLineNo">233</span><a name="line.233"></a> -<span class="sourceLineNo">234</span> updateMetricsSize(tablesCount * (functionsCount + 1)); // +1 for overall<a name="line.234"></a> -<span class="sourceLineNo">235</span> } catch (Exception e) {<a name="line.235"></a> -<span class="sourceLineNo">236</span> LOG.error("failed to get the size of all tables", e);<a name="line.236"></a> -<span class="sourceLineNo">237</span> }<a name="line.237"></a> -<span class="sourceLineNo">238</span> }<a 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class="sourceLineNo">175</span> isByTable = conf.getBoolean(HConstants.HBASE_MASTER_LOADBALANCE_BYTABLE, isByTable);<a name="line.175"></a> +<span class="sourceLineNo">176</span> minCostNeedBalance = conf.getFloat(MIN_COST_NEED_BALANCE_KEY, minCostNeedBalance);<a name="line.176"></a> +<span class="sourceLineNo">177</span> if (localityCandidateGenerator == null) {<a name="line.177"></a> +<span class="sourceLineNo">178</span> localityCandidateGenerator = new LocalityBasedCandidateGenerator(services);<a name="line.178"></a> +<span class="sourceLineNo">179</span> }<a name="line.179"></a> +<span class="sourceLineNo">180</span> localityCost = new ServerLocalityCostFunction(conf, services);<a name="line.180"></a> +<span class="sourceLineNo">181</span> rackLocalityCost = new RackLocalityCostFunction(conf, services);<a name="line.181"></a> +<span class="sourceLineNo">182</span><a name="line.182"></a> +<span class="sourceLineNo">183</span> if (this.candidateGenerators == null) {<a name="line.183"></a> +<span class="sourceLineNo">184</span> candidateGenerators = Lists.newArrayList();<a name="line.184"></a> +<span class="sourceLineNo">185</span> candidateGenerators.add(new RandomCandidateGenerator());<a name="line.185"></a> +<span class="sourceLineNo">186</span> candidateGenerators.add(new LoadCandidateGenerator());<a name="line.186"></a> +<span class="sourceLineNo">187</span> candidateGenerators.add(localityCandidateGenerator);<a name="line.187"></a> +<span class="sourceLineNo">188</span> candidateGenerators.add(new RegionReplicaRackCandidateGenerator());<a name="line.188"></a> +<span class="sourceLineNo">189</span> }<a name="line.189"></a> +<span class="sourceLineNo">190</span> regionLoadFunctions = new CostFromRegionLoadFunction[] {<a name="line.190"></a> +<span class="sourceLineNo">191</span> new ReadRequestCostFunction(conf),<a name="line.191"></a> +<span class="sourceLineNo">192</span> new WriteRequestCostFunction(conf),<a name="line.192"></a> +<span class="sourceLineNo">193</span> new MemstoreSizeCostFunction(conf),<a name="line.193"></a> +<span class="sourceLineNo">194</span> new StoreFileCostFunction(conf)<a name="line.194"></a> +<span class="sourceLineNo">195</span> };<a name="line.195"></a> +<span class="sourceLineNo">196</span> regionReplicaHostCostFunction = new RegionReplicaHostCostFunction(conf);<a name="line.196"></a> +<span class="sourceLineNo">197</span> regionReplicaRackCostFunction = new RegionReplicaRackCostFunction(conf);<a name="line.197"></a> +<span class="sourceLineNo">198</span> costFunctions = new CostFunction[]{<a name="line.198"></a> +<span class="sourceLineNo">199</span> new RegionCountSkewCostFunction(conf),<a name="line.199"></a> +<span class="sourceLineNo">200</span> new PrimaryRegionCountSkewCostFunction(conf),<a name="line.200"></a> +<span class="sourceLineNo">201</span> new MoveCostFunction(conf),<a name="line.201"></a> +<span class="sourceLineNo">202</span> localityCost,<a name="line.202"></a> +<span class="sourceLineNo">203</span> rackLocalityCost,<a name="line.203"></a> +<span class="sourceLineNo">204</span> new TableSkewCostFunction(conf),<a name="line.204"></a> +<span class="sourceLineNo">205</span> regionReplicaHostCostFunction,<a name="line.205"></a> +<span class="sourceLineNo">206</span> regionReplicaRackCostFunction,<a name="line.206"></a> +<span class="sourceLineNo">207</span> regionLoadFunctions[0],<a name="line.207"></a> +<span class="sourceLineNo">208</span> regionLoadFunctions[1],<a name="line.208"></a> +<span class="sourceLineNo">209</span> regionLoadFunctions[2],<a name="line.209"></a> +<span class="sourceLineNo">210</span> regionLoadFunctions[3],<a name="line.210"></a> +<span class="sourceLineNo">211</span> };<a name="line.211"></a> +<span class="sourceLineNo">212</span> curFunctionCosts= new Double[costFunctions.length];<a name="line.212"></a> +<span class="sourceLineNo">213</span> tempFunctionCosts= new Double[costFunctions.length];<a name="line.213"></a> +<span class="sourceLineNo">214</span> LOG.info("Loaded config; maxSteps=" + maxSteps + ", stepsPerRegion=" + stepsPerRegion +<a name="line.214"></a> +<span class="sourceLineNo">215</span> ", maxRunningTime=" + maxRunningTime + ", isByTable=" + isByTable + ", etc.");<a name="line.215"></a> +<span class="sourceLineNo">216</span> }<a name="line.216"></a> +<span class="sourceLineNo">217</span><a name="line.217"></a> +<span class="sourceLineNo">218</span> protected void setCandidateGenerators(List<CandidateGenerator> customCandidateGenerators) {<a name="line.218"></a> +<span class="sourceLineNo">219</span> this.candidateGenerators = customCandidateGenerators;<a name="line.219"></a> +<span class="sourceLineNo">220</span> }<a name="line.220"></a> +<span class="sourceLineNo">221</span><a name="line.221"></a> +<span class="sourceLineNo">222</span> @Override<a name="line.222"></a> +<span class="sourceLineNo">223</span> protected void setSlop(Configuration conf) {<a name="line.223"></a> +<span class="sourceLineNo">224</span> this.slop = conf.getFloat("hbase.regions.slop", 0.001F);<a name="line.224"></a> +<span class="sourceLineNo">225</span> }<a name="line.225"></a> +<span class="sourceLineNo">226</span><a name="line.226"></a> +<span class="sourceLineNo">227</span> @Override<a name="line.227"></a> +<span class="sourceLineNo">228</span> public synchronized void setClusterStatus(ClusterStatus st) {<a name="line.228"></a> +<span class="sourceLineNo">229</span> super.setClusterStatus(st);<a name="line.229"></a> +<span class="sourceLineNo">230</span> updateRegionLoad();<a name="line.230"></a> +<span class="sourceLineNo">231</span> for(CostFromRegionLoadFunction cost : regionLoadFunctions) {<a name="line.231"></a> +<span class="sourceLineNo">232</span> cost.setClusterStatus(st);<a name="line.232"></a> +<span class="sourceLineNo">233</span> }<a name="line.233"></a> +<span class="sourceLineNo">234</span><a name="line.234"></a> +<span class="sourceLineNo">235</span> // update metrics size<a name="line.235"></a> +<span class="sourceLineNo">236</span> try {<a name="line.236"></a> +<span class="sourceLineNo">237</span> // by-table or ensemble mode<a name="line.237"></a> +<span class="sourceLineNo">238</span> int tablesCount = isByTable ? services.getTableDescriptors().getAll().size() : 1;<a name="line.238"></a> +<span class="sourceLineNo">239</span> int functionsCount = getCostFunctionNames().length;<a name="line.239"></a> +<span class="sourceLineNo">240</span><a name="line.240"></a> +<span class="sourceLineNo">241</span> updateMetricsSize(tablesCount * (functionsCount + 1)); // +1 for overall<a name="line.241"></a> +<span class="sourceLineNo">242</span> } catch (Exception e) {<a name="line.242"></a> +<span class="sourceLineNo">243</span> LOG.error("failed to get the size of all tables", e);<a name="line.243"></a> +<span class="sourceLineNo">244</span> }<a name="line.244"></a> +<span class="sourceLineNo">245</span> }<a name="line.245"></a> +<span class="sourceLineNo">246</span><a name="line.246"></a> +<span class="sourceLineNo">247</span> /**<a name="line.247"></a> +<span class="sourceLineNo">248</span> * Update the number of metrics that are reported to JMX<a name="line.248"></a> +<span class="sourceLineNo">249</span> */<a name="line.249"></a> +<span class="sourceLineNo">250</span> public void updateMetricsSize(int size) {<a name="line.250"></a> +<span class="sourceLineNo">251</span> if (metricsBalancer instanceof MetricsStochasticBalancer) {<a name="line.251"></a> +<span class="sourceLineNo">252</span> ((MetricsStochasticBalancer) metricsBalancer).updateMetricsSize(size);<a name="line.252"></a> +<span class="sourceLineNo">253</span> }<a name="line.253"></a> +<span class="sourceLineNo">254</span> }<a name="line.254"></a> +<span class="sourceLineNo">255</span><a name="line.255"></a> +<span class="sourceLineNo">256</span> @Override<a name="line.256"></a> +<span class="sourceLineNo">257</span> public synchronized void setMasterServices(MasterServices masterServices) {<a name="line.257"></a> +<span class="sourceLineNo">258</span> super.setMasterServices(masterServices);<a name="line.258"></a> +<span class="sourceLineNo">259</span> this.localityCost.setServices(masterServices);<a name="line.259"></a> +<span class="sourceLineNo">260</span> this.rackLocalityCost.setServices(masterServices);<a name="line.260"></a> +<span class="sourceLineNo">261</span> this.localityCandidateGenerator.setServices(masterServices);<a name="line.261"></a> +<span class="sourceLineNo">262</span> }<a name="line.262"></a> +<span class="sourceLineNo">263</span><a name="line.263"></a> +<span class="sourceLineNo">264</span> @Override<a name="line.264"></a> +<span class="sourceLineNo">265</span> protected synchronized boolean areSomeRegionReplicasColocated(Cluster c) {<a name="line.265"></a> +<span class="sourceLineNo">266</span> regionReplicaHostCostFunction.init(c);<a name="line.266"></a> +<span class="sourceLineNo">267</span> if (regionReplicaHostCostFunction.cost() > 0) return true;<a name="line.267"></a> +<span class="sourceLineNo">268</span> regionReplicaRackCostFunction.init(c);<a name="line.268"></a> +<span class="sourceLineNo">269</span> if (regionReplicaRackCostFunction.cost() > 0) return true;<a name="line.269"></a> +<span class="sourceLineNo">270</span> return false;<a name="line.270"></a> +<span class="sourceLineNo">271</span> }<a name="line.271"></a> +<span class="sourceLineNo">272</span><a name="line.272"></a> +<span class="sourceLineNo">273</span> @Override<a name="line.273"></a> +<span class="sourceLineNo">274</span> protected boolean needsBalance(Cluster cluster) {<a name="line.274"></a> +<span class="sourceLineNo">275</span> ClusterLoadState cs = new ClusterLoadState(cluster.clusterState);<a name="line.275"></a> +<span class="sourceLineNo">276</span> if (cs.getNumServers() < MIN_SERVER_BALANCE) {<a name="line.276"></a> +<span class="sourceLineNo">277</span> if (LOG.isDebugEnabled()) {<a name="line.277"></a> +<span class="sourceLineNo">278</span> LOG.debug("Not running balancer because only " + cs.getNumServers()<a name="line.278"></a> +<span class="sourceLineNo">279</span> + " active regionserver(s)");<a name="line.279"></a> +<span class="sourceLineNo">280</span> }<a name="line.280"></a> +<span class="sourceLineNo">281</span> return false;<a name="line.281"></a> +<span class="sourceLineNo">282</span> }<a name="line.282"></a> +<span class="sourceLineNo">283</span> if (areSomeRegionReplicasColocated(cluster)) {<a name="line.283"></a> +<span class="sourceLineNo">284</span> return true;<a name="line.284"></a> +<span class="sourceLineNo">285</span> }<a name="line.285"></a> +<span class="sourceLineNo">286</span><a name="line.286"></a> +<span class="sourceLineNo">287</span> double total = 0.0;<a name="line.287"></a> +<span class="sourceLineNo">288</span> float sumMultiplier = 0.0f;<a name="line.288"></a> +<span class="sourceLineNo">289</span> for (CostFunction c : costFunctions) {<a name="line.289"></a> +<span class="sourceLineNo">290</span> float multiplier = c.getMultiplier();<a name="line.290"></a> +<span class="sourceLineNo">291</span> if (multiplier <= 0) {<a name="line.291"></a> +<span class="sourceLineNo">292</span> continue;<a name="line.292"></a> +<span class="sourceLineNo">293</span> }<a name="line.293"></a> +<span class="sourceLineNo">294</span> if (!c.isNeeded()) {<a name="line.294"></a> +<span class="sourceLineNo">295</span> LOG.debug(c.getClass().getName() + " indicated that its cost should not be considered");<a name="line.295"></a> +<span class="sourceLineNo">296</span> continue;<a name="line.296"></a> +<span class="sourceLineNo">297</span> }<a name="line.297"></a> +<span class="sourceLineNo">298</span> sumMultiplier += multiplier;<a name="line.298"></a> +<span class="sourceLineNo">299</span> total += c.cost() * multiplier;<a name="line.299"></a> +<span class="sourceLineNo">300</span> }<a name="line.300"></a> +<span class="sourceLineNo">301</span><a name="line.301"></a> +<span class="sourceLineNo">302</span> if (total <= 0 || sumMultiplier <= 0<a name="line.302"></a> +<span class="sourceLineNo">303</span> || (sumMultiplier > 0 && (total / sumMultiplier) < minCostNeedBalance)) {<a name="line.303"></a> +<span class="sourceLineNo">304</span> if (LOG.isTraceEnabled()) {<a name="line.304"></a> +<span class="sourceLineNo">305</span> LOG.trace("Skipping load balancing because balanced cluster; " + "total cost is " + total<a name="line.305"></a> +<span class="sourceLineNo">306</span> + ", sum multiplier is " + sumMultiplier + " min cost which need balance is "<a name="line.306"></a> +<span class="sourceLineNo">307</span> + minCostNeedBalance);<a name="line.307"></a> +<span class="sourceLineNo">308</span> }<a name="line.308"></a> +<span class="sourceLineNo">309</span> return false;<a name="line.309"></a> +<span class="sourceLineNo">310</span> }<a name="line.310"></a> +<span class="sourceLineNo">311</span> return true;<a name="line.311"></a> <span class="sourceLineNo">312</span> }<a name="line.312"></a> <span class="sourceLineNo">313</span><a name="line.313"></a> -<span class="sourceLineNo">314</span> /**<a name="line.314"></a> -<span class="sourceLineNo">315</span> * Given the cluster state this will try and approach an optimal balance. This<a name="line.315"></a> -<span class="sourceLineNo">316</span> * should always approach the optimal state given enough steps.<a name="line.316"></a> -<span class="sourceLineNo">317</span> */<a name="line.317"></a> -<span class="sourceLineNo">318</span> @Override<a name="line.318"></a> -<span class="sourceLineNo">319</span> public synchronized List<RegionPlan> balanceCluster(Map<ServerName,<a name="line.319"></a> -<span class="sourceLineNo">320</span> List<HRegionInfo>> clusterState) {<a name="line.320"></a> -<span class="sourceLineNo">321</span> List<RegionPlan> plans = balanceMasterRegions(clusterState);<a name="line.321"></a> -<span class="sourceLineNo">322</span> if (plans != null || clusterState == null || clusterState.size() <= 1) {<a name="line.322"></a> -<span class="sourceLineNo">323</span> return plans;<a name="line.323"></a> -<span class="sourceLineNo">324</span> }<a name="line.324"></a> -<span class="sourceLineNo">325</span><a name="line.325"></a> -<span class="sourceLineNo">326</span> if (masterServerName != null && clusterState.containsKey(masterServerName)) {<a name="line.326"></a> -<span class="sourceLineNo">327</span> if (clusterState.size() <= 2) {<a name="line.327"></a> -<span class="sourceLineNo">328</span> return null;<a name="line.328"></a> -<span class="sourceLineNo">329</span> }<a name="line.329"></a> -<span class="sourceLineNo">330</span> clusterState = new HashMap<>(clusterState);<a name="line.330"></a> -<span class="sourceLineNo">331</span> clusterState.remove(masterServerName);<a name="line.331"></a> -<span class="sourceLineNo">332</span> }<a name="line.332"></a> -<span class="sourceLineNo">333</span><a name="line.333"></a> -<span class="sourceLineNo">334</span> // On clusters with lots of HFileLinks or lots of reference files,<a name="line.334"></a> -<span class="sourceLineNo">335</span> // instantiating the storefile infos can be quite expensive.<a name="line.335"></a> -<span class="sourceLineNo">336</span> // Allow turning this feature off if the locality cost is not going to<a name="line.336"></a> -<span class="sourceLineNo">337</span> // be used in any computations.<a name="line.337"></a> -<span class="sourceLineNo">338</span> RegionLocationFinder finder = null;<a name="line.338"></a> -<span class="sourceLineNo">339</span> if (this.localityCost != null && this.localityCost.getMultiplier() > 0) {<a name="line.339"></a> -<span class="sourceLineNo">340</span> finder = this.regionFinder;<a name="line.340"></a> -<span class="sourceLineNo">341</span> }<a name="line.341"></a> -<span class="sourceLineNo">342</span><a name="line.342"></a> -<span class="sourceLineNo">343</span> //The clusterState that is given to this method contains the state<a name="line.343"></a> -<span class="sourceLineNo">344</span> //of all the regions in the table(s) (that's true today)<a name="line.344"></a> -<span class="sourceLineNo">345</span> // Keep track of servers to iterate through them.<a name="line.345"></a> -<span class="sourceLineNo">346</span> Cluster cluster = new Cluster(clusterState, loads, finder, rackManager);<a name="line.346"></a> -<span class="sourceLineNo">347</span><a name="line.347"></a> -<span class="sourceLineNo">348</span> long startTime = EnvironmentEdgeManager.currentTime();<a name="line.348"></a> -<span class="sourceLineNo">349</span><a name="line.349"></a> -<span class="sourceLineNo">350</span> initCosts(cluster);<a name="line.350"></a> -<span class="sourceLineNo">351</span><a name="line.351"></a> -<span class="sourceLineNo">352</span> if (!needsBalance(cluster)) {<a name="line.352"></a> -<span class="sourceLineNo">353</span> return null;<a name="line.353"></a> -<span class="sourceLineNo">354</span> }<a name="line.354"></a> +<span class="sourceLineNo">314</span> @Override<a name="line.314"></a> +<span class="sourceLineNo">315</span> public synchronized List<RegionPlan> balanceCluster(TableName tableName, Map<ServerName,<a name="line.315"></a> +<span class="sourceLineNo">316</span> List<HRegionInfo>> clusterState) {<a name="line.316"></a> +<span class="sourceLineNo">317</span> this.tableName = tableName;<a name="line.317"></a> +<span class="sourceLineNo">318</span> return balanceCluster(clusterState);<a name="line.318"></a> +<span class="sourceLineNo">319</span> }<a name="line.319"></a> +<span class="sourceLineNo">320</span><a name="line.320"></a> +<span class="sourceLineNo">321</span> /**<a name="line.321"></a> +<span class="sourceLineNo">322</span> * Given the cluster state this will try and approach an optimal balance. This<a name="line.322"></a> +<span class="sourceLineNo">323</span> * should always approach the optimal state given enough steps.<a name="line.323"></a> +<span class="sourceLineNo">324</span> */<a name="line.324"></a> +<span class="sourceLineNo">325</span> @Override<a name="line.325"></a> +<span class="sourceLineNo">326</span> public synchronized List<RegionPlan> balanceCluster(Map<ServerName,<a name="line.326"></a> +<span class="sourceLineNo">327</span> List<HRegionInfo>> clusterState) {<a name="line.327"></a> +<span class="sourceLineNo">328</span> List<RegionPlan> plans = balanceMasterRegions(clusterState);<a name="line.328"></a> +<span class="sourceLineNo">329</span> if (plans != null || clusterState == null || clusterState.size() <= 1) {<a name="line.329"></a> +<span class="sourceLineNo">330</span> return plans;<a name="line.330"></a> +<span class="sourceLineNo">331</span> }<a name="line.331"></a> +<span class="sourceLineNo">332</span><a name="line.332"></a> +<span class="sourceLineNo">333</span> if (masterServerName != null && clusterState.containsKey(masterServerName)) {<a name="line.333"></a> +<span class="sourceLineNo">334</span> if (clusterState.size() <= 2) {<a name="line.334"></a> +<span class="sourceLineNo">335</span> return null;<a name="line.335"></a> +<span class="sourceLineNo">336</span> }<a name="line.336"></a> +<span class="sourceLineNo">337</span> clusterState = new HashMap<>(clusterState);<a name="line.337"></a> +<span class="sourceLineNo">338</span> clusterState.remove(masterServerName);<a name="line.338"></a> +<span class="sourceLineNo">339</span> }<a name="line.339"></a> +<span class="sourceLineNo">340</span><a name="line.340"></a> +<span class="sourceLineNo">341</span> // On clusters with lots of HFileLinks or lots of reference files,<a name="line.341"></a> +<span class="sourceLineNo">342</span> // instantiating the storefile infos can be quite expensive.<a name="line.342"></a> +<span class="sourceLineNo">343</span> // Allow turning this feature off if the locality cost is not going to<a name="line.343"></a> +<span class="sourceLineNo">344</span> // be used in any computations.<a name="line.344"></a> +<span class="sourceLineNo">345</span> RegionLocationFinder finder = null;<a name="line.345"></a> +<span class="sourceLineNo">346</span> if (this.localityCost != null && this.localityCost.getMultiplier() > 0<a name="line.346"></a> +<span class="sourceLineNo">347</span> || this.rackLocalityCost != null && this.rackLocalityCost.getMultiplier() > 0) {<a name="line.347"></a> +<span class="sourceLineNo">348</span> finder = this.regionFinder;<a name="line.348"></a> +<span class="sourceLineNo">349</span> }<a name="line.349"></a> +<span class="sourceLineNo">350</span><a name="line.350"></a> +<span class="sourceLineNo">351</span> //The clusterState that is given to this method contains the state<a name="line.351"></a> +<span class="sourceLineNo">352</span> //of all the regions in the table(s) (that's true today)<a name="line.352"></a> +<span class="sourceLineNo">353</span> // Keep track of servers to iterate through them.<a name="line.353"></a> +<span class="sourceLineNo">354</span> Cluster cluster = new Cluster(clusterState, loads, finder, rackManager);<a name="line.354"></a> <span class="sourceLineNo">355</span><a name="line.355"></a> -<span class="sourceLineNo">356</span> double currentCost = computeCost(cluster, Double.MAX_VALUE);<a name="line.356"></a> -<span class="sourceLineNo">357</span> curOverallCost = currentCost;<a name="line.357"></a> -<span class="sourceLineNo">358</span> for (int i = 0; i < this.curFunctionCosts.length; i++) {<a name="line.358"></a> -<span class="sourceLineNo">359</span> curFunctionCosts[i] = tempFunctionCosts[i];<a name="line.359"></a> -<span class="sourceLineNo">360</span> }<a name="line.360"></a> -<span class="sourceLineNo">361</span> LOG.info("start StochasticLoadBalancer.balancer, initCost=" + currentCost + ", functionCost="<a name="line.361"></a> -<span class="sourceLineNo">362</span> + functionCost());<a name="line.362"></a> +<span class="sourceLineNo">356</span> long startTime = EnvironmentEdgeManager.currentTime();<a name="line.356"></a> +<span class="sourceLineNo">357</span><a name="line.357"></a> +<span class="sourceLineNo">358</span> initCosts(cluster);<a name="line.358"></a> +<span class="sourceLineNo">359</span><a name="line.359"></a> +<span class="sourceLineNo">360</span> if (!needsBalance(cluster)) {<a name="line.360"></a> +<span class="sourceLineNo">361</span> return null;<a name="line.361"></a> +<span class="sourceLineNo">362</span> }<a name="line.362"></a> <span class="sourceLineNo">363</span><a name="line.363"></a> -<span class="sourceLineNo">364</span> double initCost = currentCost;<a name="line.364"></a> -<span class="sourceLineNo">365</span> double newCost = currentCost;<a name="line.365"></a> -<span class="sourceLineNo">366</span><a name="line.366"></a> -<span class="sourceLineNo">367</span> long computedMaxSteps;<a name="line.367"></a> -<span class="sourceLineNo">368</span> if (runMaxSteps) {<a name="line.368"></a> -<span class="sourceLineNo">369</span> computedMaxSteps = Math.max(this.maxSteps,<a name="line.369"></a> -<span class="sourceLineNo">370</span> ((long)cluster.numRegions * (long)this.stepsPerRegion * (long)cluster.numServers));<a name="line.370"></a> -<span class="sourceLineNo">371</span> } else {<a name="line.371"></a> -<span class="sourceLineNo">372</span> computedMaxSteps = Math.min(this.maxSteps,<a name="line.372"></a> -<span class="sourceLineNo">373</span> ((long)cluster.numRegions * (long)this.stepsPerRegion * (long)cluster.numServers));<a name="line.373"></a> -<span class="sourceLineNo">374</span> }<a name="line.374"></a> -<span class="sourceLineNo">375</span> // Perform a stochastic walk to see if we can get a good fit.<a name="line.375"></a> -<span class="sourceLineNo">376</span> long step;<a name="line.376"></a> -<span class="sourceLineNo">377</span><a name="line.377"></a> -<span class="sourceLineNo">378</span> for (step = 0; step < computedMaxSteps; step++) {<a name="line.378"></a> -<span class="sourceLineNo">379</span> int generatorIdx = RANDOM.nextInt(candidateGenerators.size());<a name="line.379"></a> -<span class="sourceLineNo">380</span> CandidateGenerator p = candidateGenerators.get(generatorIdx);<a name="line.380"></a> -<span class="sourceLineNo">381</span> Cluster.Action action = p.generate(cluster);<a name="line.381"></a> -<span class="sourceLineNo">382</span><a name="line.382"></a> -<span class="sourceLineNo">383</span> if (action.type == Type.NULL) {<a name="line.383"></a> -<span class="sourceLineNo">384</span> continue;<a name="line.384"></a> -<span class="sourceLineNo">385</span> }<a name="line.385"></a> -<span class="sourceLineNo">386</span><a name="line.386"></a> -<span class="sourceLineNo">387</span> cluster.doAction(action);<a name="line.387"></a> -<span class="sourceLineNo">388</span> updateCostsWithAction(cluster, action);<a name="line.388"></a> -<span class="sourceLineNo">389</span><a name="line.389"></a> -<span class="sourceLineNo">390</span> newCost = computeCost(cluster, currentCost);<a name="line.390"></a> -<span class="sourceLineNo">391</span><a name="line.391"></a> -<span class="sourceLineNo">392</span> // Should this be kept?<a name="line.392"></a> -<span class="sourceLineNo">393</span> if (newCost < currentCost) {<a name="line.393"></a> -<span class="sourceLineNo">394</span> currentCost = newCost;<a name="line.394"></a> -<span class="sourceLineNo">395</span><a name="line.395"></a> -<span class="sourceLineNo">396</span> // save for JMX<a name="line.396"></a> -<span class="sourceLineNo">397</span> curOverallCost = currentCost;<a name="line.397"></a> -<span class="sourceLineNo">398</span> for (int i = 0; i < this.curFunctionCosts.length; i++) {<a name="line.398"></a> -<span class="sourceLineNo">399</span> curFunctionCosts[i] = tempFunctionCosts[i];<a name="line.399"></a> -<span class="sourceLineNo">400</span> }<a name="line.400"></a> -<span class="sourceLineNo">401</span> } else {<a name="line.401"></a> -<span class="sourceLineNo">402</span> // Put things back the way they were before.<a name="line.402"></a> -<span class="sourceLineNo">403</span> // TODO: undo by remembering old values<a name="line.403"></a> -<span class="sourceLineNo">404</span> Action undoAction = action.undoAction();<a name="line.404"></a> -<span class="sourceLineNo">405</span> cluster.doAction(undoAction);<a name="line.405"></a> -<span class="sourceLineNo">406</span> updateCostsWithAction(cluster, undoAction);<a name="line.406"></a> -<span class="sourceLineNo">407</span> }<a name="line.407"></a> -<span class="sourceLineNo">408</span><a name="line.408"></a> -<span class="sourceLineNo">409</span> if (EnvironmentEdgeManager.currentTime() - startTime ><a name="line.409"></a> -<span class="sourceLineNo">410</span> maxRunningTime) {<a name="line.410"></a> -<span class="sourceLineNo">411</span> break;<a name="line.411"></a> -<span class="sourceLineNo">412</span> }<a name="line.412"></a> -<span class="sourceLineNo">413</span> }<a name="line.413"></a> -<span class="sourceLineNo">414</span> long endTime = EnvironmentEdgeManager.currentTime();<a name="line.414"></a> -<span class="sourceLineNo">415</span><a name="line.415"></a> -<span class="sourceLineNo">416</span> metricsBalancer.balanceCluster(endTime - startTime);<a name="line.416"></a> -<span class="sourceLineNo">417</span><a name="line.417"></a> -<span class="sourceLineNo">418</span> // update costs metrics<a name="line.418"></a> -<span class="sourceLineNo">419</span> updateStochasticCosts(tableName, curOverallCost, curFunctionCosts);<a name="line.419"></a> -<span class="sourceLineNo">420</span> if (initCost > currentCost) {<a name="line.420"></a> -<span class="sourceLineNo">421</span> plans = createRegionPlans(cluster);<a name="line.421"></a> -<span class="sourceLineNo">422</span> if (LOG.isDebugEnabled()) {<a name="line.422"></a> -<span class="sourceLineNo">423</span> LOG.debug("Finished computing new load balance plan. Computation took "<a name="line.423"></a> -<span class="sourceLineNo">424</span> + (endTime - startTime) + "ms to try " + step<a name="line.424"></a> -<span class="sourceLineNo">425</span> + " different iterations. Found a solution that moves "<a name="line.425"></a> -<span class="sourceLineNo">426</span> + plans.size() + " regions; Going from a computed cost of "<a name="line.426"></a> -<span class="sourceLineNo">427</span> + initCost + " to a new cost of " + currentCost);<a name="line.427"></a> -<span class="sourceLineNo">428</span> }<a name="line.428"></a> -<span class="sourceLineNo">429</span><a name="line.429"></a> -<span class="sourceLineNo">430</span> return plans;<a name="line.430"></a> -<span class="sourceLineNo">431</span> }<a name="line.431"></a> -<span class="sourceLineNo">432</span> if (LOG.isDebugEnabled()) {<a name="line.432"></a> -<span class="sourceLineNo">433</span> LOG.debug("Could not find a better load balance plan. Tried "<a name="line.433"></a> -<span class="sourceLineNo">434</span> + step + " different configurations in " + (endTime - startTime)<a name="line.434"></a> -<span class="sourceLineNo">435</span> + "ms, and did not find anything with a computed cost less than " + initCost);<a name="line.435"></a> -<span class="sourceLineNo">436</span> }<a name="line.436"></a> -<span class="sourceLineNo">437</span> return null;<a name="line.437"></a> -<span class="sourceLineNo">438</span> }<a name="line.438"></a> -<span class="sourceLineNo">439</span><a name="line.439"></a> -<span class="sourceLineNo">440</span> /**<a name="line.440"></a> -<span class="sourceLineNo">441</span> * update costs to JMX<a name="line.441"></a> -<span class="sourceLineNo">442</span> */<a name="line.442"></a> -<span class="sourceLineNo">443</span> private void updateStochasticCosts(TableName tableName, Double overall, Double[] subCosts) {<a name="line.443"></a> -<span class="sourceLineNo">444</span> if (tableName == null) return;<a name="line.444"></a> -<span class="sourceLineNo">445</span><a name="line.445"></a> -<span class="sourceLineNo">446</span> // check if the metricsBalancer is MetricsStochasticBalancer before casting<a name="line.446"></a> -<span class="sourceLineNo">447</span> if (metricsBalancer instanceof MetricsStochasticBalancer) {<a name="line.447"></a> -<span class="sourceLineNo">448</span> MetricsStochasticBalancer balancer = (MetricsStochasticBalancer) metricsBalancer;<a name="line.448"></a> -<span class="sourceLineNo">449</span> // overall cost<a name="line.449"></a> -<span class="sourceLineNo">450</span> balancer.updateStochasticCost(tableName.getNameAsString(),<a name="line.450"></a> -<span class="sourceLineNo">451</span> "Overall", "Overall cost", overall);<a name="line.451"></a> -<span class="sourceLineNo">452</span><a name="line.452"></a> -<span class="sourceLineNo">453</span> // each cost function<a name="line.453"></a> -<span class="sourceLineNo">454</span> for (int i = 0; i < costFunctions.length; i++) {<a name="line.454"></a> -<span class="sourceLineNo">455</span> CostFunction costFunction = costFunctions[i];<a name="line.455"></a> -<span class="sourceLineNo">456</span> String costFunctionName = costFunction.getClass().getSimpleName();<a name="line.456"></a> -<span class="sourceLineNo">457</span> Double costPercent = (overall == 0) ? 0 : (subCosts[i] / overall);<a name="line.457"></a> -<span class="sourceLineNo">458</span> // TODO: cost function may need a specific description<a name="line.458"></a> -<span class="sourceLineNo">459</span> balancer.updateStochasticCost(tableName.getNameAsString(), costFunctionName,<a name="line.459"></a> -<span class="sourceLineNo">460</span> "The percent of " + costFunctionName, costPercent);<a name="line.460"></a> -<span class="sourceLineNo">461</span> }<a name="line.461"></a> -<span class="sourceLineNo">462</span> }<a name="line.462"></a> -<span class="sourceLineNo">463</span> }<a name="line.463"></a> -<span class="sourceLineNo">464</span><a name="line.464"></a> -<span class="sourceLineNo">465</span> private String functionCost() {<a name="line.465"></a> -<span class="sourceLineNo">466</span> StringBuilder builder = new StringBuilder();<a name="line.466"></a> -<span class="sourceLineNo">467</span> for (CostFunction c:costFunctions) {<a name="line.467"></a> -<span class="sourceLineNo">468</span> builder.append(c.getClass().getSimpleName());<a name="line.468"></a> -<span class="sourceLineNo">469</span> builder.append(" : (");<a name="line.469"></a> -<span class="sourceLineNo">470</span> builder.append(c.getMultiplier());<a name="line.470"></a> -<span class="sourceLineNo">471</span> builder.append(", ");<a name="line.471"></a> -<span class="sourceLineNo">472</span> builder.append(c.cost());<a name="line.472"></a> -<span class="sourceLineNo">473</span> builder.append("); ");<a name="line.473"></a> -<span class="sourceLineNo">474</span> }<a name="line.474"></a> -<span class="sourceLineNo">475</span> return builder.toString();<a name="line.475"></a> -<span class="sourceLineNo">476</span> }<a name="line.476"></a> -<span class="sourceLineNo">477</span><a name="line.477"></a> -<span class="sourceLineNo">478</span> /**<a name="line.478"></a> -<span class="sourceLineNo">479</span> * Create all of the RegionPlan's needed to move from the initial cluster state to the desired<a name="line.479"></a> -<span class="sourceLineNo">480</span> * state.<a name="line.480"></a> -<span class="sourceLineNo">481</span> *<a name="line.481"></a> -<span class="sourceLineNo">482</span> * @param cluster The state of the cluster<a name="line.482"></a> -<span class="sourceLineNo">483</span> * @return List of RegionPlan's that represent the moves needed to get to desired final state.<a name="line.483"></a> -<span class="sourceLineNo">484</span> */<a name="line.484"></a> -<span class="sourceLineNo">485</span> private List<RegionPlan> createRegionPlans(Cluster cluster) {<a 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cluster.servers[initialServerIndex];<a name="line.494"></a> -<span class="sourceLineNo">495</span> ServerName newServer = cluster.servers[newServerIndex];<a name="line.495"></a> -<span class="sourceLineNo">496</span><a name="line.496"></a> -<span class="sourceLineNo">497</span> if (LOG.isTraceEnabled()) {<a name="line.497"></a> -<span class="sourceLineNo">498</span> LOG.trace("Moving Region " + region.getEncodedName() + " from server "<a name="line.498"></a> -<span class="sourceLineNo">499</span> + initialServer.getHostname() + " to " + newServer.getHostname());<a name="line.499"></a> -<span class="sourceLineNo">500</span> }<a name="line.500"></a> -<span class="sourceLineNo">501</span> RegionPlan rp = new RegionPlan(region, initialServer, newServer);<a name="line.501"></a> -<span class="sourceLineNo">502</span> plans.add(rp);<a name="line.502"></a> -<span class="sourceLineNo">503</span> }<a name="line.503"></a> -<span class="sourceLineNo">504</span> }<a name="line.504"></a> -<span class="sourceLineNo">505</span> return plans;<a name="line.505"></a> -<span class="sourceLineNo">506</span> }<a name="line.506"></a> -<span class="sourceLineNo">507</span><a name="line.507"></a> -<span class="sourceLineNo">508</span> /**<a name="line.508"></a> -<span class="sourceLineNo">509</span> * Store the current region loads.<a name="line.509"></a> -<span class="sourceLineNo">510</span> */<a name="line.510"></a> -<span class="sourceLineNo">511</span> private synchronized void updateRegionLoad() {<a name="line.511"></a> -<span class="sourceLineNo">512</span> // We create a new hashmap so that regions that are no longer there are removed.<a name="line.512"></a> -<span class="sourceLineNo">513</span> // However we temporarily need the old loads so we can use them to keep the rolling average.<a name="line.513"></a> -<span class="sourceLineNo">514</span> Map<String, Deque<BalancerRegionLoad>> oldLoads = loads;<a name="line.514"></a> -<span class="sourceLineNo">515</span> loads = new HashMap<>();<a name="line.515"></a> -<span class="sourceLineNo">516</span><a name="line.516"></a> -<span class="sourceLineNo">517</span> for (ServerName sn : clusterStatus.getServers()) {<a name="line.517"></a> -<span class="sourceLineNo">518</span> ServerLoad sl = clusterStatus.getLoad(sn);<a name="line.518"></a> -<span class="sourceLineNo">519</span> if (sl == null) {<a name="line.519"></a> -<span class="sourceLineNo">520</span> continue;<a name="line.520"></a> -<span class="sourceLineNo">521</span> }<a name="line.521"></a> -<span class="sourceLineNo">522</span> for (Entry<byte[], RegionLoad> entry : sl.getRegionsLoad().entrySet()) {<a name="line.522"></a> -<span class="sourceLineNo">523</span> Deque<BalancerRegionLoad> rLoads = oldLoads.get(Bytes.toString(entry.getKey()));<a name="line.523"></a> -<span class="sourceLineNo">524</span> if (rLoads == null) {<a name="line.524"></a> -<span class="sourceLineNo">525</span> // There was nothing there<a name="line.525"></a> -<span 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class="sourceLineNo">549</span> }<a name="line.549"></a> -<span class="sourceLineNo">550</span> }<a name="line.550"></a> -<span class="sourceLineNo">551</span><a name="line.551"></a> -<span class="sourceLineNo">552</span> /**<a name="line.552"></a> -<span class="sourceLineNo">553</span> * Get the names of the cost functions<a name="line.553"></a> -<span class="sourceLineNo">554</span> */<a name="line.554"></a> -<span class="sourceLineNo">555</span> public String[] getCostFunctionNames() {<a name="line.555"></a> -<span class="sourceLineNo">556</span> if (costFunctions == null) return null;<a name="line.556"></a> -<span class="sourceLineNo">557</span> String[] ret = new String[costFunctions.length];<a name="line.557"></a> -<span class="sourceLineNo">558</span> for (int i = 0; i < costFunctions.length; i++) {<a name="line.558"></a> -<span class="sourceLineNo">559</span> CostFunction c = costFunctions[i];<a name="line.559"></a> -<span class="sourceLineNo">560</span> ret[i] = c.getClass().getSimpleName();<a name="line.560"></a> -<span class="sourceLineNo">561</span> }<a name="line.561"></a> -<span class="sourceLineNo">562</span><a name="line.562"></a> -<span class="sourceLineNo">563</span> retu
<TRUNCATED>
