http://git-wip-us.apache.org/repos/asf/hbase-site/blob/8bb348c6/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/SimpleLoadBalancer.html
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@@ -54,402 +54,398 @@
<span class="sourceLineNo">046</span> * <p>Cluster-wide load balancing
will occur only when there are no regions in<a name="line.46"></a>
<span class="sourceLineNo">047</span> * transition and according to a fixed
period of a time using {@link #balanceCluster(Map)}.<a name="line.47"></a>
<span class="sourceLineNo">048</span> *<a name="line.48"></a>
-<span class="sourceLineNo">049</span> * <p>Inline region placement with
{@link #immediateAssignment} can be used when<a name="line.49"></a>
-<span class="sourceLineNo">050</span> * the Master needs to handle closed
regions that it currently does not have<a name="line.50"></a>
-<span class="sourceLineNo">051</span> * a destination set for. This can
happen during master failover.<a name="line.51"></a>
-<span class="sourceLineNo">052</span> *<a name="line.52"></a>
-<span class="sourceLineNo">053</span> * <p>On cluster startup, bulk
assignment can be used to determine<a name="line.53"></a>
-<span class="sourceLineNo">054</span> * locations for all Regions in a
cluster.<a name="line.54"></a>
-<span class="sourceLineNo">055</span> *<a name="line.55"></a>
-<span class="sourceLineNo">056</span> * <p>This classes produces plans
for the <a name="line.56"></a>
-<span class="sourceLineNo">057</span> * {@link
org.apache.hadoop.hbase.master.AssignmentManager} to execute.<a
name="line.57"></a>
-<span class="sourceLineNo">058</span> */<a name="line.58"></a>
-<span
class="sourceLineNo">059</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a
name="line.59"></a>
-<span class="sourceLineNo">060</span>public class SimpleLoadBalancer extends
BaseLoadBalancer {<a name="line.60"></a>
-<span class="sourceLineNo">061</span> private static final Log LOG =
LogFactory.getLog(SimpleLoadBalancer.class);<a name="line.61"></a>
-<span class="sourceLineNo">062</span> private static final Random RANDOM =
new Random(System.currentTimeMillis());<a name="line.62"></a>
+<span class="sourceLineNo">049</span> * <p>On cluster startup, bulk
assignment can be used to determine<a name="line.49"></a>
+<span class="sourceLineNo">050</span> * locations for all Regions in a
cluster.<a name="line.50"></a>
+<span class="sourceLineNo">051</span> *<a name="line.51"></a>
+<span class="sourceLineNo">052</span> * <p>This classes produces plans
for the<a name="line.52"></a>
+<span class="sourceLineNo">053</span> * {@link
org.apache.hadoop.hbase.master.AssignmentManager} to execute.<a
name="line.53"></a>
+<span class="sourceLineNo">054</span> */<a name="line.54"></a>
+<span
class="sourceLineNo">055</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a
name="line.55"></a>
+<span class="sourceLineNo">056</span>public class SimpleLoadBalancer extends
BaseLoadBalancer {<a name="line.56"></a>
+<span class="sourceLineNo">057</span> private static final Log LOG =
LogFactory.getLog(SimpleLoadBalancer.class);<a name="line.57"></a>
+<span class="sourceLineNo">058</span> private static final Random RANDOM =
new Random(System.currentTimeMillis());<a name="line.58"></a>
+<span class="sourceLineNo">059</span><a name="line.59"></a>
+<span class="sourceLineNo">060</span> private RegionInfoComparator
riComparator = new RegionInfoComparator();<a name="line.60"></a>
+<span class="sourceLineNo">061</span> private RegionPlan.RegionPlanComparator
rpComparator = new RegionPlan.RegionPlanComparator();<a name="line.61"></a>
+<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
-<span class="sourceLineNo">064</span> private RegionInfoComparator
riComparator = new RegionInfoComparator();<a name="line.64"></a>
-<span class="sourceLineNo">065</span> private RegionPlan.RegionPlanComparator
rpComparator = new RegionPlan.RegionPlanComparator();<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> /**<a name="line.68"></a>
-<span class="sourceLineNo">069</span> * Stores additional per-server
information about the regions added/removed<a name="line.69"></a>
-<span class="sourceLineNo">070</span> * during the run of the balancing
algorithm.<a name="line.70"></a>
-<span class="sourceLineNo">071</span> *<a name="line.71"></a>
-<span class="sourceLineNo">072</span> * For servers that shed regions, we
need to track which regions we have already<a name="line.72"></a>
-<span class="sourceLineNo">073</span> * shed.
<b>nextRegionForUnload</b> contains the index in the list of
regions on<a name="line.73"></a>
-<span class="sourceLineNo">074</span> * the server that is the next to be
shed.<a name="line.74"></a>
-<span class="sourceLineNo">075</span> */<a name="line.75"></a>
-<span class="sourceLineNo">076</span> static class BalanceInfo {<a
name="line.76"></a>
-<span class="sourceLineNo">077</span><a name="line.77"></a>
-<span class="sourceLineNo">078</span> private final int
nextRegionForUnload;<a name="line.78"></a>
-<span class="sourceLineNo">079</span> private int numRegionsAdded;<a
name="line.79"></a>
-<span class="sourceLineNo">080</span><a name="line.80"></a>
-<span class="sourceLineNo">081</span> public BalanceInfo(int
nextRegionForUnload, int numRegionsAdded) {<a name="line.81"></a>
-<span class="sourceLineNo">082</span> this.nextRegionForUnload =
nextRegionForUnload;<a name="line.82"></a>
-<span class="sourceLineNo">083</span> this.numRegionsAdded =
numRegionsAdded;<a name="line.83"></a>
+<span class="sourceLineNo">064</span> /**<a name="line.64"></a>
+<span class="sourceLineNo">065</span> * Stores additional per-server
information about the regions added/removed<a name="line.65"></a>
+<span class="sourceLineNo">066</span> * during the run of the balancing
algorithm.<a name="line.66"></a>
+<span class="sourceLineNo">067</span> *<a name="line.67"></a>
+<span class="sourceLineNo">068</span> * For servers that shed regions, we
need to track which regions we have already<a name="line.68"></a>
+<span class="sourceLineNo">069</span> * shed.
<b>nextRegionForUnload</b> contains the index in the list of
regions on<a name="line.69"></a>
+<span class="sourceLineNo">070</span> * the server that is the next to be
shed.<a name="line.70"></a>
+<span class="sourceLineNo">071</span> */<a name="line.71"></a>
+<span class="sourceLineNo">072</span> static class BalanceInfo {<a
name="line.72"></a>
+<span class="sourceLineNo">073</span><a name="line.73"></a>
+<span class="sourceLineNo">074</span> private final int
nextRegionForUnload;<a name="line.74"></a>
+<span class="sourceLineNo">075</span> private int numRegionsAdded;<a
name="line.75"></a>
+<span class="sourceLineNo">076</span><a name="line.76"></a>
+<span class="sourceLineNo">077</span> public BalanceInfo(int
nextRegionForUnload, int numRegionsAdded) {<a name="line.77"></a>
+<span class="sourceLineNo">078</span> this.nextRegionForUnload =
nextRegionForUnload;<a name="line.78"></a>
+<span class="sourceLineNo">079</span> this.numRegionsAdded =
numRegionsAdded;<a name="line.79"></a>
+<span class="sourceLineNo">080</span> }<a name="line.80"></a>
+<span class="sourceLineNo">081</span><a name="line.81"></a>
+<span class="sourceLineNo">082</span> int getNextRegionForUnload() {<a
name="line.82"></a>
+<span class="sourceLineNo">083</span> return nextRegionForUnload;<a
name="line.83"></a>
<span class="sourceLineNo">084</span> }<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
-<span class="sourceLineNo">086</span> int getNextRegionForUnload() {<a
name="line.86"></a>
-<span class="sourceLineNo">087</span> return nextRegionForUnload;<a
name="line.87"></a>
+<span class="sourceLineNo">086</span> int getNumRegionsAdded() {<a
name="line.86"></a>
+<span class="sourceLineNo">087</span> return numRegionsAdded;<a
name="line.87"></a>
<span class="sourceLineNo">088</span> }<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
-<span class="sourceLineNo">090</span> int getNumRegionsAdded() {<a
name="line.90"></a>
-<span class="sourceLineNo">091</span> return numRegionsAdded;<a
name="line.91"></a>
+<span class="sourceLineNo">090</span> void setNumRegionsAdded(int numAdded)
{<a name="line.90"></a>
+<span class="sourceLineNo">091</span> this.numRegionsAdded = numAdded;<a
name="line.91"></a>
<span class="sourceLineNo">092</span> }<a name="line.92"></a>
-<span class="sourceLineNo">093</span><a name="line.93"></a>
-<span class="sourceLineNo">094</span> void setNumRegionsAdded(int numAdded)
{<a name="line.94"></a>
-<span class="sourceLineNo">095</span> this.numRegionsAdded = numAdded;<a
name="line.95"></a>
-<span class="sourceLineNo">096</span> }<a name="line.96"></a>
-<span class="sourceLineNo">097</span> }<a name="line.97"></a>
-<span class="sourceLineNo">098</span><a name="line.98"></a>
-<span class="sourceLineNo">099</span> /**<a name="line.99"></a>
-<span class="sourceLineNo">100</span> * Generate a global load balancing
plan according to the specified map of<a name="line.100"></a>
-<span class="sourceLineNo">101</span> * server information to the most
loaded regions of each server.<a name="line.101"></a>
-<span class="sourceLineNo">102</span> *<a name="line.102"></a>
-<span class="sourceLineNo">103</span> * The load balancing invariant is that
all servers are within 1 region of the<a name="line.103"></a>
-<span class="sourceLineNo">104</span> * average number of regions per
server. If the average is an integer number,<a name="line.104"></a>
-<span class="sourceLineNo">105</span> * all servers will be balanced to the
average. Otherwise, all servers will<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * have either floor(average) or
ceiling(average) regions.<a name="line.106"></a>
-<span class="sourceLineNo">107</span> *<a name="line.107"></a>
-<span class="sourceLineNo">108</span> * HBASE-3609 Modeled regionsToMove
using Guava's MinMaxPriorityQueue so that<a name="line.108"></a>
-<span class="sourceLineNo">109</span> * we can fetch from both ends of the
queue.<a name="line.109"></a>
-<span class="sourceLineNo">110</span> * At the beginning, we check whether
there was empty region server<a name="line.110"></a>
-<span class="sourceLineNo">111</span> * just discovered by Master. If so,
we alternately choose new / old<a name="line.111"></a>
-<span class="sourceLineNo">112</span> * regions from head / tail of
regionsToMove, respectively. This alternation<a name="line.112"></a>
-<span class="sourceLineNo">113</span> * avoids clustering young regions on
the newly discovered region server.<a name="line.113"></a>
-<span class="sourceLineNo">114</span> * Otherwise, we choose new regions
from head of regionsToMove.<a name="line.114"></a>
-<span class="sourceLineNo">115</span> *<a name="line.115"></a>
-<span class="sourceLineNo">116</span> * Another improvement from HBASE-3609
is that we assign regions from<a name="line.116"></a>
-<span class="sourceLineNo">117</span> * regionsToMove to underloaded
servers in round-robin fashion.<a name="line.117"></a>
-<span class="sourceLineNo">118</span> * Previously one underloaded server
would be filled before we move onto<a name="line.118"></a>
-<span class="sourceLineNo">119</span> * the next underloaded server,
leading to clustering of young regions.<a name="line.119"></a>
-<span class="sourceLineNo">120</span> *<a name="line.120"></a>
-<span class="sourceLineNo">121</span> * Finally, we randomly shuffle
underloaded servers so that they receive<a name="line.121"></a>
-<span class="sourceLineNo">122</span> * offloaded regions relatively
evenly across calls to balanceCluster().<a name="line.122"></a>
-<span class="sourceLineNo">123</span> *<a name="line.123"></a>
-<span class="sourceLineNo">124</span> * The algorithm is currently
implemented as such:<a name="line.124"></a>
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+<span class="sourceLineNo">094</span><a name="line.94"></a>
+<span class="sourceLineNo">095</span> /**<a name="line.95"></a>
+<span class="sourceLineNo">096</span> * Generate a global load balancing
plan according to the specified map of<a name="line.96"></a>
+<span class="sourceLineNo">097</span> * server information to the most
loaded regions of each server.<a name="line.97"></a>
+<span class="sourceLineNo">098</span> *<a name="line.98"></a>
+<span class="sourceLineNo">099</span> * The load balancing invariant is that
all servers are within 1 region of the<a name="line.99"></a>
+<span class="sourceLineNo">100</span> * average number of regions per
server. If the average is an integer number,<a name="line.100"></a>
+<span class="sourceLineNo">101</span> * all servers will be balanced to the
average. Otherwise, all servers will<a name="line.101"></a>
+<span class="sourceLineNo">102</span> * have either floor(average) or
ceiling(average) regions.<a name="line.102"></a>
+<span class="sourceLineNo">103</span> *<a name="line.103"></a>
+<span class="sourceLineNo">104</span> * HBASE-3609 Modeled regionsToMove
using Guava's MinMaxPriorityQueue so that<a name="line.104"></a>
+<span class="sourceLineNo">105</span> * we can fetch from both ends of the
queue.<a name="line.105"></a>
+<span class="sourceLineNo">106</span> * At the beginning, we check whether
there was empty region server<a name="line.106"></a>
+<span class="sourceLineNo">107</span> * just discovered by Master. If so,
we alternately choose new / old<a name="line.107"></a>
+<span class="sourceLineNo">108</span> * regions from head / tail of
regionsToMove, respectively. This alternation<a name="line.108"></a>
+<span class="sourceLineNo">109</span> * avoids clustering young regions on
the newly discovered region server.<a name="line.109"></a>
+<span class="sourceLineNo">110</span> * Otherwise, we choose new regions
from head of regionsToMove.<a name="line.110"></a>
+<span class="sourceLineNo">111</span> *<a name="line.111"></a>
+<span class="sourceLineNo">112</span> * Another improvement from HBASE-3609
is that we assign regions from<a name="line.112"></a>
+<span class="sourceLineNo">113</span> * regionsToMove to underloaded
servers in round-robin fashion.<a name="line.113"></a>
+<span class="sourceLineNo">114</span> * Previously one underloaded server
would be filled before we move onto<a name="line.114"></a>
+<span class="sourceLineNo">115</span> * the next underloaded server,
leading to clustering of young regions.<a name="line.115"></a>
+<span class="sourceLineNo">116</span> *<a name="line.116"></a>
+<span class="sourceLineNo">117</span> * Finally, we randomly shuffle
underloaded servers so that they receive<a name="line.117"></a>
+<span class="sourceLineNo">118</span> * offloaded regions relatively
evenly across calls to balanceCluster().<a name="line.118"></a>
+<span class="sourceLineNo">119</span> *<a name="line.119"></a>
+<span class="sourceLineNo">120</span> * The algorithm is currently
implemented as such:<a name="line.120"></a>
+<span class="sourceLineNo">121</span> *<a name="line.121"></a>
+<span class="sourceLineNo">122</span> * <ol><a name="line.122"></a>
+<span class="sourceLineNo">123</span> * <li>Determine the two valid
numbers of regions each server should have,<a name="line.123"></a>
+<span class="sourceLineNo">124</span> *
<b>MIN</b>=floor(average) and
<b>MAX</b>=ceiling(average).<a name="line.124"></a>
<span class="sourceLineNo">125</span> *<a name="line.125"></a>
-<span class="sourceLineNo">126</span> * <ol><a name="line.126"></a>
-<span class="sourceLineNo">127</span> * <li>Determine the two valid
numbers of regions each server should have,<a name="line.127"></a>
-<span class="sourceLineNo">128</span> *
<b>MIN</b>=floor(average) and
<b>MAX</b>=ceiling(average).<a name="line.128"></a>
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-<span class="sourceLineNo">130</span> * <li>Iterate down the most
loaded servers, shedding regions from each so<a name="line.130"></a>
-<span class="sourceLineNo">131</span> * each server hosts exactly
<b>MAX</b> regions. Stop once you reach a<a name="line.131"></a>
-<span class="sourceLineNo">132</span> * server that already has
&lt;= <b>MAX</b> regions.<a name="line.132"></a>
-<span class="sourceLineNo">133</span> * <p><a name="line.133"></a>
-<span class="sourceLineNo">134</span> * Order the regions to move from
most recent to least.<a name="line.134"></a>
+<span class="sourceLineNo">126</span> * <li>Iterate down the most
loaded servers, shedding regions from each so<a name="line.126"></a>
+<span class="sourceLineNo">127</span> * each server hosts exactly
<b>MAX</b> regions. Stop once you reach a<a name="line.127"></a>
+<span class="sourceLineNo">128</span> * server that already has
&lt;= <b>MAX</b> regions.<a name="line.128"></a>
+<span class="sourceLineNo">129</span> * <p><a name="line.129"></a>
+<span class="sourceLineNo">130</span> * Order the regions to move from
most recent to least.<a name="line.130"></a>
+<span class="sourceLineNo">131</span> *<a name="line.131"></a>
+<span class="sourceLineNo">132</span> * <li>Iterate down the least
loaded servers, assigning regions so each server<a name="line.132"></a>
+<span class="sourceLineNo">133</span> * has exactly
<b>MIN</b> regions. Stop once you reach a server that<a
name="line.133"></a>
+<span class="sourceLineNo">134</span> * already has &gt;=
<b>MIN</b> regions.<a name="line.134"></a>
<span class="sourceLineNo">135</span> *<a name="line.135"></a>
-<span class="sourceLineNo">136</span> * <li>Iterate down the least
loaded servers, assigning regions so each server<a name="line.136"></a>
-<span class="sourceLineNo">137</span> * has exactly
<b>MIN</b> regions. Stop once you reach a server that<a
name="line.137"></a>
-<span class="sourceLineNo">138</span> * already has &gt;=
<b>MIN</b> regions.<a name="line.138"></a>
-<span class="sourceLineNo">139</span> *<a name="line.139"></a>
-<span class="sourceLineNo">140</span> * Regions being assigned to
underloaded servers are those that were shed<a name="line.140"></a>
-<span class="sourceLineNo">141</span> * in the previous step. It is
possible that there were not enough<a name="line.141"></a>
-<span class="sourceLineNo">142</span> * regions shed to fill each
underloaded server to <b>MIN</b>. If so we<a name="line.142"></a>
-<span class="sourceLineNo">143</span> * end up with a number of regions
required to do so, <b>neededRegions</b>.<a name="line.143"></a>
+<span class="sourceLineNo">136</span> * Regions being assigned to
underloaded servers are those that were shed<a name="line.136"></a>
+<span class="sourceLineNo">137</span> * in the previous step. It is
possible that there were not enough<a name="line.137"></a>
+<span class="sourceLineNo">138</span> * regions shed to fill each
underloaded server to <b>MIN</b>. If so we<a name="line.138"></a>
+<span class="sourceLineNo">139</span> * end up with a number of regions
required to do so, <b>neededRegions</b>.<a name="line.139"></a>
+<span class="sourceLineNo">140</span> *<a name="line.140"></a>
+<span class="sourceLineNo">141</span> * It is also possible that we were
able to fill each underloaded but ended<a name="line.141"></a>
+<span class="sourceLineNo">142</span> * up with regions that were
unassigned from overloaded servers but that<a name="line.142"></a>
+<span class="sourceLineNo">143</span> * still do not have assignment.<a
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<span class="sourceLineNo">144</span> *<a name="line.144"></a>
-<span class="sourceLineNo">145</span> * It is also possible that we were
able to fill each underloaded but ended<a name="line.145"></a>
-<span class="sourceLineNo">146</span> * up with regions that were
unassigned from overloaded servers but that<a name="line.146"></a>
-<span class="sourceLineNo">147</span> * still do not have assignment.<a
name="line.147"></a>
+<span class="sourceLineNo">145</span> * If neither of these conditions
hold (no regions needed to fill the<a name="line.145"></a>
+<span class="sourceLineNo">146</span> * underloaded servers, no regions
leftover from overloaded servers),<a name="line.146"></a>
+<span class="sourceLineNo">147</span> * we are done and return.
Otherwise we handle these cases below.<a name="line.147"></a>
<span class="sourceLineNo">148</span> *<a name="line.148"></a>
-<span class="sourceLineNo">149</span> * If neither of these conditions
hold (no regions needed to fill the<a name="line.149"></a>
-<span class="sourceLineNo">150</span> * underloaded servers, no regions
leftover from overloaded servers),<a name="line.150"></a>
-<span class="sourceLineNo">151</span> * we are done and return.
Otherwise we handle these cases below.<a name="line.151"></a>
-<span class="sourceLineNo">152</span> *<a name="line.152"></a>
-<span class="sourceLineNo">153</span> * <li>If
<b>neededRegions</b> is non-zero (still have underloaded
servers),<a name="line.153"></a>
-<span class="sourceLineNo">154</span> * we iterate the most loaded
servers again, shedding a single server from<a name="line.154"></a>
-<span class="sourceLineNo">155</span> * each (this brings them from
having <b>MAX</b> regions to having<a name="line.155"></a>
-<span class="sourceLineNo">156</span> * <b>MIN</b>
regions).<a name="line.156"></a>
+<span class="sourceLineNo">149</span> * <li>If
<b>neededRegions</b> is non-zero (still have underloaded
servers),<a name="line.149"></a>
+<span class="sourceLineNo">150</span> * we iterate the most loaded
servers again, shedding a single server from<a name="line.150"></a>
+<span class="sourceLineNo">151</span> * each (this brings them from
having <b>MAX</b> regions to having<a name="line.151"></a>
+<span class="sourceLineNo">152</span> * <b>MIN</b>
regions).<a name="line.152"></a>
+<span class="sourceLineNo">153</span> *<a name="line.153"></a>
+<span class="sourceLineNo">154</span> * <li>We now definitely have
more regions that need assignment, either from<a name="line.154"></a>
+<span class="sourceLineNo">155</span> * the previous step or from the
original shedding from overloaded servers.<a name="line.155"></a>
+<span class="sourceLineNo">156</span> * Iterate the least loaded servers
filling each to <b>MIN</b>.<a name="line.156"></a>
<span class="sourceLineNo">157</span> *<a name="line.157"></a>
-<span class="sourceLineNo">158</span> * <li>We now definitely have
more regions that need assignment, either from<a name="line.158"></a>
-<span class="sourceLineNo">159</span> * the previous step or from the
original shedding from overloaded servers.<a name="line.159"></a>
-<span class="sourceLineNo">160</span> * Iterate the least loaded servers
filling each to <b>MIN</b>.<a name="line.160"></a>
+<span class="sourceLineNo">158</span> * <li>If we still have more
regions that need assignment, again iterate the<a name="line.158"></a>
+<span class="sourceLineNo">159</span> * least loaded servers, this time
giving each one (filling them to<a name="line.159"></a>
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Arrays.asList(underloadedServers.keySet().toArray(new
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bi.setNumRegionsAdded(bi.getNumRegionsAdded()+1);<a name="line.311"></a>
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name="line.267"></a>
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name="line.269"></a>
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server.getKey().getLoad();<a name="line.271"></a>
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name="line.276"></a>
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name="line.278"></a>
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underloadedServers.put(server.getKey().getServerName(), regionsToPut);<a
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Arrays.asList(underloadedServers.keySet().toArray(new
ServerName[serversUnderloaded]));<a name="line.287"></a>
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underloadedServers.size(); i += incr) {<a name="line.292"></a>
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bi);<a name="line.305"></a>
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bi.setNumRegionsAdded(bi.getNumRegionsAdded()+1);<a name="line.307"></a>
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sb.append(e.getKey().toString());<a name="line.411"></a>
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name="line.413"></a>
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regionsToMove.isEmpty()) {<a name="line.320"></a>
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name="line.326"></a>
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+<span class="sourceLineNo">329</span> // Need to do a second pass.<a
name="line.329"></a>
+<span class="sourceLineNo">330</span> // Either more regions to assign out
or servers that are still underloaded<a name="line.330"></a>
+<span class="sourceLineNo">331</span><a name="line.331"></a>
+<span class="sourceLineNo">332</span> // If we need more to fill min, grab
one from each most loaded until enough<a name="line.332"></a>
+<span class="sourceLineNo">333</span> if (neededRegions != 0) {<a
name="line.333"></a>
+<span class="sourceLineNo">334</span> // Walk down most loaded, grabbing
one from each until we get enough<a name="line.334"></a>
+<span class="sourceLineNo">335</span> for (Map.Entry<ServerAndLoad,
List<HRegionInfo>> server :<a name="line.335"></a>
+<span class="sourceLineNo">336</span>
serversByLoad.descendingMap().entrySet()) {<a name="line.336"></a>
+<span class="sourceLineNo">337</span> BalanceInfo balanceInfo =<a
name="line.337"></a>
+<span class="sourceLineNo">338</span>
serverBalanceInfo.get(server.getKey().getServerName());<a name="line.338"></a>
+<span class="sourceLineNo">339</span> int idx =<a name="line.339"></a>
+<span class="sourceLineNo">340</span> balanceInfo == null ? 0 :
balanceInfo.getNextRegionForUnload();<a name="line.340"></a>
+<span class="sourceLineNo">341</span> if (idx >=
server.getValue().size()) break;<a name="line.341"></a>
+<span class="sourceLineNo">342</span> HRegionInfo region =
server.getValue().get(idx);<a name="line.342"></a>
+<span class="sourceLineNo">343</span> if (region.isMetaRegion())
continue; // Don't move meta regions.<a name="line.343"></a>
+<span class="sourceLineNo">344</span> regionsToMove.add(new
RegionPlan(region, server.getKey().getServerName(), null));<a
name="line.344"></a>
+<span class="sourceLineNo">345</span> totalNumMoved++;<a
name="line.345"></a>
+<span class="sourceLineNo">346</span> if (--neededRegions == 0) {<a
name="line.346"></a>
+<span class="sourceLineNo">347</span> // No more regions needed, done
shedding<a name="line.347"></a>
+<span class="sourceLineNo">348</span> break;<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> }<a name="line.351"></a>
+<span class="sourceLineNo">352</span><a name="line.352"></a>
+<span class="sourceLineNo">353</span> // Now we have a set of regions that
must be all assigned out<a name="line.353"></a>
+<span class="sourceLineNo">354</span> // Assign each underloaded up to the
min, then if leftovers, assign to max<a name="line.354"></a>
+<span class="sourceLineNo">355</span><a name="line.355"></a>
+<span class="sourceLineNo">356</span> // Walk down least loaded, assigning
to each to fill up to min<a name="line.356"></a>
+<span class="sourceLineNo">357</span> for (Map.Entry<ServerAndLoad,
List<HRegionInfo>> server :<a name="line.357"></a>
+<span class="sourceLineNo">358</span> serversByLoad.entrySet()) {<a
name="line.358"></a>
+<span class="sourceLineNo">359</span> int regionCount =
server.getKey().getLoad();<a name="line.359"></a>
+<span class="sourceLineNo">360</span> if (regionCount >= min) break;<a
name="line.360"></a>
+<span class="sourceLineNo">361</span> BalanceInfo balanceInfo =
serverBalanceInfo.get(server.getKey().getServerName());<a name="line.361"></a>
+<span class="sourceLineNo">362</span> if(balanceInfo != null) {<a
name="line.362"></a>
+<span class="sourceLineNo">363</span> regionCount +=
balanceInfo.getNumRegionsAdded();<a name="line.363"></a>
+<span class="sourceLineNo">364</span> }<a name="line.364"></a>
+<span class="sourceLineNo">365</span> if(regionCount >= min) {<a
name="line.365"></a>
+<span class="sourceLineNo">366</span> continue;<a name="line.366"></a>
+<span class="sourceLineNo">367</span> }<a name="line.367"></a>
+<span class="sourceLineNo">368</span> int numToTake = min -
regionCount;<a name="line.368"></a>
+<span class="sourceLineNo">369</span> int numTaken = 0;<a
name="line.369"></a>
+<span class="sourceLineNo">370</span> while(numTaken < numToTake
&& 0 < regionsToMove.size()) {<a name="line.370"></a>
+<span class="sourceLineNo">371</span> addRegionPlan(regionsToMove,
fetchFromTail,<a name="line.371"></a>
+<span class="sourceLineNo">372</span>
server.getKey().getServerName(), regionsToReturn);<a name="line.372"></a>
+<span class="sourceLineNo">373</span> numTaken++;<a name="line.373"></a>
+<span class="sourceLineNo">374</span> }<a name="line.374"></a>
+<span class="sourceLineNo">375</span> }<a name="line.375"></a>
+<span class="sourceLineNo">376</span><a name="line.376"></a>
+<span class="sourceLineNo">377</span> // If we still have regions to dish
out, assign underloaded to max<a name="line.377"></a>
+<span class="sourceLineNo">378</span> if (0 < regionsToMove.size()) {<a
name="line.378"></a>
+<span class="sourceLineNo">379</span> for (Map.Entry<ServerAndLoad,
List<HRegionInfo>> server :<a name="line.379"></a>
+<span class="sourceLineNo">380</span> serversByLoad.entrySet()) {<a
name="line.380"></a>
+<span class="sourceLineNo">381</span> int regionCount =
server.getKey().getLoad();<a name="line.381"></a>
+<span class="sourceLineNo">382</span> BalanceInfo balanceInfo =
serverBalanceInfo.get(server.getKey().getServerName());<a name="line.382"></a>
+<span class="sourceLineNo">383</span> if(balanceInfo != null) {<a
name="line.383"></a>
+<span class="sourceLineNo">384</span> regionCount +=
balanceInfo.getNumRegionsAdded();<a name="line.384"></a>
+<span class="sourceLineNo">385</span> }<a name="line.385"></a>
+<span class="sourceLineNo">386</span> if(regionCount >= max) {<a
name="line.386"></a>
+<span class="sourceLineNo">387</span> break;<a name="line.387"></a>
+<span class="sourceLineNo">388</span> }<a name="line.388"></a>
+<span class="sourceLineNo">389</span> addRegionPlan(regionsToMove,
fetchFromTail,<a name="line.389"></a>
+<span class="sourceLineNo">390</span>
server.getKey().getServerName(), regionsToReturn);<a name="line.390"></a>
+<span class="sourceLineNo">391</span> if (regionsToMove.isEmpty()) {<a
name="line.391"></a>
+<span class="sourceLineNo">392</span> break;<a name="line.392"></a>
+<span class="sourceLineNo">393</span> }<a name="line.393"></a>
+<span class="sourceLineNo">394</span> }<a name="line.394"></a>
+<span class="sourceLineNo">395</span> }<a name="line.395"></a>
+<span class="sourceLineNo">396</span><a name="line.396"></a>
+<span class="sourceLineNo">397</span> long endTime =
System.currentTimeMillis();<a name="line.397"></a>
+<span class="sourceLineNo">398</span><a name="line.398"></a>
+<span class="sourceLineNo">399</span> if (!regionsToMove.isEmpty() ||
neededRegions != 0) {<a name="line.399"></a>
+<span class="sourceLineNo">400</span> // Emit data so can diagnose how
balancer went astray.<a name="line.400"></a>
+<span class="sourceLineNo">401</span> LOG.warn("regionsToMove=" +
totalNumMoved +<a name="line.401"></a>
+<span class="sourceLineNo">402</span> ", numServers=" + numServers + ",
serversOverloaded=" + serversOverloaded +<a name="line.402"></a>
+<span class="sourceLineNo">403</span> ", serversUnderloaded=" +
serversUnderloaded);<a name="line.403"></a>
+<span class="sourceLineNo">404</span> StringBuilder sb = new
StringBuilder();<a name="line.404"></a>
+<span class="sourceLineNo">405</span> for (Map.Entry<ServerName,
List<HRegionInfo>> e: clusterMap.entrySet()) {<a name="line.405"></a>
+<span class="sourceLineNo">406</span> if (sb.length() > 0)
sb.append(", ");<a name="line.406"></a>
+<span class="sourceLineNo">407</span>
sb.append(e.getKey().toString());<a name="line.407"></a>
+<span class="sourceLineNo">408</span> sb.append(" ");<a
name="line.408"></a>
+<span class="sourceLineNo">409</span> sb.append(e.getValue().size());<a
name="line.409"></a>
+<span class="sourceLineNo">410</span> }<a name="line.410"></a>
+<span class="sourceLineNo">411</span> LOG.warn("Input " +
sb.toString());<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> // All done!<a name="line.414"></a>
+<span class="sourceLineNo">415</span> LOG.info("Done. Calculated a load
balance in " + (endTime-startTime) + "ms. " +<a name="line.415"></a>
+<span class="sourceLineNo">416</span> "Moving " + totalNumMoved + "
regions off of " +<a name="line.416"></a>
+<span class="sourceLineNo">417</span> serversOverloaded + " overloaded
servers onto " +<a name="line.417"></a>
+<span class="sourceLineNo">418</span> serversUnderloaded + " less
loaded servers");<a name="line.418"></a>
+<span class="sourceLineNo">419</span><a name="line.419"></a>
+<span class="sourceLineNo">420</span> return regionsToReturn;<a
name="line.420"></a>
+<span class="sourceLineNo">421</span> }<a name="line.421"></a>
+<span class="sourceLineNo">422</span><a name="line.422"></a>
+<span class="sourceLineNo">423</span> /**<a name="line.423"></a>
+<span class="sourceLineNo">424</span> * Add a region from the head or tail
to the List of regions to return.<a name="line.424"></a>
+<span class="sourceLineNo">425</span> */<a name="line.425"></a>
+<span class="sourceLineNo">426</span> private void addRegionPlan(final
MinMaxPriorityQueue<RegionPlan> regionsToMove,<a name="line.426"></a>
+<span class="sourceLineNo">427</span> final boolean fetchFromTail, final
ServerName sn, List<RegionPlan> regionsToReturn) {<a name="line.427"></a>
+<span class="sourceLineNo">428</span> RegionPlan rp = null;<a
name="line.428"></a>
+<span class="sourceLineNo">429</span> if (!fetchFromTail) rp =
regionsToMove.remove();<a name="line.429"></a>
+<span class="sourceLineNo">430</span> else rp =
regionsToMove.removeLast();<a name="line.430"></a>
+<span class="sourceLineNo">431</span> rp.setDestination(sn);<a
name="line.431"></a>
+<span class="sourceLineNo">432</span> regionsToReturn.add(rp);<a
name="line.432"></a>
+<span class="sourceLineNo">433</span> }<a name="line.433"></a>
+<span class="sourceLineNo">434</span><a name="line.434"></a>
+<span class="sourceLineNo">435</span> @Override<a name="line.435"></a>
+<span class="sourceLineNo">436</span> public List<RegionPlan>
balanceCluster(TableName tableName,<a name="line.436"></a>
+<span class="sourceLineNo">437</span> Map<ServerName,
List<HRegionInfo>> clusterState) throws HBaseIOException {<a
name="line.437"></a>
+<span class="sourceLineNo">438</span> return
balanceCluster(clusterState);<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>
