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Posted to commits@hbase.apache.org by mi...@apache.org on 2016/02/12 22:25:45 UTC
[20/51] [partial] hbase-site git commit: Published site at
85e1d9a109341c5f4aabb0e82c96ab52e99a6d72.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/526c7822/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/Segment.html
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html lang="en">
+<head>
+<title>Source code</title>
+<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
+</head>
+<body>
+<div class="sourceContainer">
+<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
+<span class="sourceLineNo">002</span> *<a name="line.2"></a>
+<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a>
+<span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a>
+<span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a>
+<span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a>
+<span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a>
+<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a>
+<span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a>
+<span class="sourceLineNo">010</span> *<a name="line.10"></a>
+<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a>
+<span class="sourceLineNo">012</span> *<a name="line.12"></a>
+<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a>
+<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a>
+<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a>
+<span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a>
+<span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a>
+<span class="sourceLineNo">018</span> */<a name="line.18"></a>
+<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a>
+<span class="sourceLineNo">020</span><a name="line.20"></a>
+<span class="sourceLineNo">021</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.21"></a>
+<span class="sourceLineNo">022</span><a name="line.22"></a>
+<span class="sourceLineNo">023</span>import org.apache.commons.logging.Log;<a name="line.23"></a>
+<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.Cell;<a name="line.24"></a>
+<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.KeyValue;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.KeyValueUtil;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.util.ByteRange;<a name="line.29"></a>
+<span class="sourceLineNo">030</span><a name="line.30"></a>
+<span class="sourceLineNo">031</span>/**<a name="line.31"></a>
+<span class="sourceLineNo">032</span> * This is an abstraction of a segment maintained in a memstore, e.g., the active<a name="line.32"></a>
+<span class="sourceLineNo">033</span> * cell set or its snapshot.<a name="line.33"></a>
+<span class="sourceLineNo">034</span> *<a name="line.34"></a>
+<span class="sourceLineNo">035</span> * This abstraction facilitates the management of the compaction pipeline and the shifts of these<a name="line.35"></a>
+<span class="sourceLineNo">036</span> * segments from active set to snapshot set in the default implementation.<a name="line.36"></a>
+<span class="sourceLineNo">037</span> */<a name="line.37"></a>
+<span class="sourceLineNo">038</span>@InterfaceAudience.Private<a name="line.38"></a>
+<span class="sourceLineNo">039</span>public abstract class Segment {<a name="line.39"></a>
+<span class="sourceLineNo">040</span><a name="line.40"></a>
+<span class="sourceLineNo">041</span> private volatile MemStoreLAB memStoreLAB;<a name="line.41"></a>
+<span class="sourceLineNo">042</span> private final AtomicLong size;<a name="line.42"></a>
+<span class="sourceLineNo">043</span> private final TimeRangeTracker timeRangeTracker;<a name="line.43"></a>
+<span class="sourceLineNo">044</span> protected volatile boolean tagsPresent;<a name="line.44"></a>
+<span class="sourceLineNo">045</span><a name="line.45"></a>
+<span class="sourceLineNo">046</span> protected Segment(MemStoreLAB memStoreLAB, long size) {<a name="line.46"></a>
+<span class="sourceLineNo">047</span> this.memStoreLAB = memStoreLAB;<a name="line.47"></a>
+<span class="sourceLineNo">048</span> this.size = new AtomicLong(size);<a name="line.48"></a>
+<span class="sourceLineNo">049</span> this.timeRangeTracker = new TimeRangeTracker();<a name="line.49"></a>
+<span class="sourceLineNo">050</span> this.tagsPresent = false;<a name="line.50"></a>
+<span class="sourceLineNo">051</span> }<a name="line.51"></a>
+<span class="sourceLineNo">052</span><a name="line.52"></a>
+<span class="sourceLineNo">053</span> protected Segment(Segment segment) {<a name="line.53"></a>
+<span class="sourceLineNo">054</span> this.memStoreLAB = segment.getMemStoreLAB();<a name="line.54"></a>
+<span class="sourceLineNo">055</span> this.size = new AtomicLong(segment.getSize());<a name="line.55"></a>
+<span class="sourceLineNo">056</span> this.timeRangeTracker = segment.getTimeRangeTracker();<a name="line.56"></a>
+<span class="sourceLineNo">057</span> this.tagsPresent = segment.isTagsPresent();<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> /**<a name="line.60"></a>
+<span class="sourceLineNo">061</span> * Creates the scanner that is able to scan the concrete segment<a name="line.61"></a>
+<span class="sourceLineNo">062</span> * @return a scanner for the given read point<a name="line.62"></a>
+<span class="sourceLineNo">063</span> */<a name="line.63"></a>
+<span class="sourceLineNo">064</span> public abstract SegmentScanner getSegmentScanner(long readPoint);<a name="line.64"></a>
+<span class="sourceLineNo">065</span><a name="line.65"></a>
+<span class="sourceLineNo">066</span> /**<a name="line.66"></a>
+<span class="sourceLineNo">067</span> * Returns whether the segment has any cells<a name="line.67"></a>
+<span class="sourceLineNo">068</span> * @return whether the segment has any cells<a name="line.68"></a>
+<span class="sourceLineNo">069</span> */<a name="line.69"></a>
+<span class="sourceLineNo">070</span> public abstract boolean isEmpty();<a name="line.70"></a>
+<span class="sourceLineNo">071</span><a name="line.71"></a>
+<span class="sourceLineNo">072</span> /**<a name="line.72"></a>
+<span class="sourceLineNo">073</span> * Returns number of cells in segment<a name="line.73"></a>
+<span class="sourceLineNo">074</span> * @return number of cells in segment<a name="line.74"></a>
+<span class="sourceLineNo">075</span> */<a name="line.75"></a>
+<span class="sourceLineNo">076</span> public abstract int getCellsCount();<a name="line.76"></a>
+<span class="sourceLineNo">077</span><a name="line.77"></a>
+<span class="sourceLineNo">078</span> /**<a name="line.78"></a>
+<span class="sourceLineNo">079</span> * Adds the given cell into the segment<a name="line.79"></a>
+<span class="sourceLineNo">080</span> * @return the change in the heap size<a name="line.80"></a>
+<span class="sourceLineNo">081</span> */<a name="line.81"></a>
+<span class="sourceLineNo">082</span> public abstract long add(Cell cell);<a name="line.82"></a>
+<span class="sourceLineNo">083</span><a name="line.83"></a>
+<span class="sourceLineNo">084</span> /**<a name="line.84"></a>
+<span class="sourceLineNo">085</span> * Removes the given cell from the segment<a name="line.85"></a>
+<span class="sourceLineNo">086</span> * @return the change in the heap size<a name="line.86"></a>
+<span class="sourceLineNo">087</span> */<a name="line.87"></a>
+<span class="sourceLineNo">088</span> public abstract long rollback(Cell cell);<a name="line.88"></a>
+<span class="sourceLineNo">089</span><a name="line.89"></a>
+<span class="sourceLineNo">090</span> /**<a name="line.90"></a>
+<span class="sourceLineNo">091</span> * Returns the first cell in the segment that has equal or greater key than the given cell<a name="line.91"></a>
+<span class="sourceLineNo">092</span> * @return the first cell in the segment that has equal or greater key than the given cell<a name="line.92"></a>
+<span class="sourceLineNo">093</span> */<a name="line.93"></a>
+<span class="sourceLineNo">094</span> public abstract Cell getFirstAfter(Cell cell);<a name="line.94"></a>
+<span class="sourceLineNo">095</span><a name="line.95"></a>
+<span class="sourceLineNo">096</span> /**<a name="line.96"></a>
+<span class="sourceLineNo">097</span> * Returns a set of all cells in the segment<a name="line.97"></a>
+<span class="sourceLineNo">098</span> * @return a set of all cells in the segment<a name="line.98"></a>
+<span class="sourceLineNo">099</span> */<a name="line.99"></a>
+<span class="sourceLineNo">100</span> public abstract CellSet getCellSet();<a name="line.100"></a>
+<span class="sourceLineNo">101</span><a name="line.101"></a>
+<span class="sourceLineNo">102</span> /**<a name="line.102"></a>
+<span class="sourceLineNo">103</span> * Closing a segment before it is being discarded<a name="line.103"></a>
+<span class="sourceLineNo">104</span> */<a name="line.104"></a>
+<span class="sourceLineNo">105</span> public void close() {<a name="line.105"></a>
+<span class="sourceLineNo">106</span> MemStoreLAB mslab = getMemStoreLAB();<a name="line.106"></a>
+<span class="sourceLineNo">107</span> if(mslab != null) {<a name="line.107"></a>
+<span class="sourceLineNo">108</span> mslab.close();<a name="line.108"></a>
+<span class="sourceLineNo">109</span> }<a name="line.109"></a>
+<span class="sourceLineNo">110</span> // do not set MSLab to null as scanners may still be reading the data here and need to decrease<a name="line.110"></a>
+<span class="sourceLineNo">111</span> // the counter when they finish<a name="line.111"></a>
+<span class="sourceLineNo">112</span> }<a name="line.112"></a>
+<span class="sourceLineNo">113</span><a name="line.113"></a>
+<span class="sourceLineNo">114</span> /**<a name="line.114"></a>
+<span class="sourceLineNo">115</span> * If the segment has a memory allocator the cell is being cloned to this space, and returned;<a name="line.115"></a>
+<span class="sourceLineNo">116</span> * otherwise the given cell is returned<a name="line.116"></a>
+<span class="sourceLineNo">117</span> * @return either the given cell or its clone<a name="line.117"></a>
+<span class="sourceLineNo">118</span> */<a name="line.118"></a>
+<span class="sourceLineNo">119</span> public Cell maybeCloneWithAllocator(Cell cell) {<a name="line.119"></a>
+<span class="sourceLineNo">120</span> if (getMemStoreLAB() == null) {<a name="line.120"></a>
+<span class="sourceLineNo">121</span> return cell;<a name="line.121"></a>
+<span class="sourceLineNo">122</span> }<a name="line.122"></a>
+<span class="sourceLineNo">123</span><a name="line.123"></a>
+<span class="sourceLineNo">124</span> int len = KeyValueUtil.length(cell);<a name="line.124"></a>
+<span class="sourceLineNo">125</span> ByteRange alloc = getMemStoreLAB().allocateBytes(len);<a name="line.125"></a>
+<span class="sourceLineNo">126</span> if (alloc == null) {<a name="line.126"></a>
+<span class="sourceLineNo">127</span> // The allocation was too large, allocator decided<a name="line.127"></a>
+<span class="sourceLineNo">128</span> // not to do anything with it.<a name="line.128"></a>
+<span class="sourceLineNo">129</span> return cell;<a name="line.129"></a>
+<span class="sourceLineNo">130</span> }<a name="line.130"></a>
+<span class="sourceLineNo">131</span> assert alloc.getBytes() != null;<a name="line.131"></a>
+<span class="sourceLineNo">132</span> KeyValueUtil.appendToByteArray(cell, alloc.getBytes(), alloc.getOffset());<a name="line.132"></a>
+<span class="sourceLineNo">133</span> KeyValue newKv = new KeyValue(alloc.getBytes(), alloc.getOffset(), len);<a name="line.133"></a>
+<span class="sourceLineNo">134</span> newKv.setSequenceId(cell.getSequenceId());<a name="line.134"></a>
+<span class="sourceLineNo">135</span> return newKv;<a name="line.135"></a>
+<span class="sourceLineNo">136</span> }<a name="line.136"></a>
+<span class="sourceLineNo">137</span><a name="line.137"></a>
+<span class="sourceLineNo">138</span> public boolean shouldSeek(Scan scan, long oldestUnexpiredTS) {<a name="line.138"></a>
+<span class="sourceLineNo">139</span> return (getTimeRangeTracker().includesTimeRange(scan.getTimeRange())<a name="line.139"></a>
+<span class="sourceLineNo">140</span> && (getTimeRangeTracker().getMaximumTimestamp() >=<a name="line.140"></a>
+<span class="sourceLineNo">141</span> oldestUnexpiredTS));<a name="line.141"></a>
+<span class="sourceLineNo">142</span> }<a name="line.142"></a>
+<span class="sourceLineNo">143</span><a name="line.143"></a>
+<span class="sourceLineNo">144</span> public long getMinTimestamp() {<a name="line.144"></a>
+<span class="sourceLineNo">145</span> return getTimeRangeTracker().getMinimumTimestamp();<a name="line.145"></a>
+<span class="sourceLineNo">146</span> }<a name="line.146"></a>
+<span class="sourceLineNo">147</span><a name="line.147"></a>
+<span class="sourceLineNo">148</span> public boolean isTagsPresent() {<a name="line.148"></a>
+<span class="sourceLineNo">149</span> return tagsPresent;<a name="line.149"></a>
+<span class="sourceLineNo">150</span> }<a name="line.150"></a>
+<span class="sourceLineNo">151</span><a name="line.151"></a>
+<span class="sourceLineNo">152</span> public void incScannerCount() {<a name="line.152"></a>
+<span class="sourceLineNo">153</span> if(getMemStoreLAB() != null) {<a name="line.153"></a>
+<span class="sourceLineNo">154</span> getMemStoreLAB().incScannerCount();<a name="line.154"></a>
+<span class="sourceLineNo">155</span> }<a name="line.155"></a>
+<span class="sourceLineNo">156</span> }<a name="line.156"></a>
+<span class="sourceLineNo">157</span><a name="line.157"></a>
+<span class="sourceLineNo">158</span> public void decScannerCount() {<a name="line.158"></a>
+<span class="sourceLineNo">159</span> if(getMemStoreLAB() != null) {<a name="line.159"></a>
+<span class="sourceLineNo">160</span> getMemStoreLAB().decScannerCount();<a name="line.160"></a>
+<span class="sourceLineNo">161</span> }<a name="line.161"></a>
+<span class="sourceLineNo">162</span> }<a name="line.162"></a>
+<span class="sourceLineNo">163</span><a name="line.163"></a>
+<span class="sourceLineNo">164</span> /**<a name="line.164"></a>
+<span class="sourceLineNo">165</span> * Setting the heap size of the segment - used to account for different class overheads<a name="line.165"></a>
+<span class="sourceLineNo">166</span> * @return this object<a name="line.166"></a>
+<span class="sourceLineNo">167</span> */<a name="line.167"></a>
+<span class="sourceLineNo">168</span><a name="line.168"></a>
+<span class="sourceLineNo">169</span> public Segment setSize(long size) {<a name="line.169"></a>
+<span class="sourceLineNo">170</span> this.size.set(size);<a name="line.170"></a>
+<span class="sourceLineNo">171</span> return this;<a name="line.171"></a>
+<span class="sourceLineNo">172</span> }<a name="line.172"></a>
+<span class="sourceLineNo">173</span><a name="line.173"></a>
+<span class="sourceLineNo">174</span> /**<a name="line.174"></a>
+<span class="sourceLineNo">175</span> * Returns the heap size of the segment<a name="line.175"></a>
+<span class="sourceLineNo">176</span> * @return the heap size of the segment<a name="line.176"></a>
+<span class="sourceLineNo">177</span> */<a name="line.177"></a>
+<span class="sourceLineNo">178</span> public long getSize() {<a name="line.178"></a>
+<span class="sourceLineNo">179</span> return size.get();<a name="line.179"></a>
+<span class="sourceLineNo">180</span> }<a name="line.180"></a>
+<span class="sourceLineNo">181</span><a name="line.181"></a>
+<span class="sourceLineNo">182</span> /**<a name="line.182"></a>
+<span class="sourceLineNo">183</span> * Increases the heap size counter of the segment by the given delta<a name="line.183"></a>
+<span class="sourceLineNo">184</span> */<a name="line.184"></a>
+<span class="sourceLineNo">185</span> public void incSize(long delta) {<a name="line.185"></a>
+<span class="sourceLineNo">186</span> size.addAndGet(delta);<a name="line.186"></a>
+<span class="sourceLineNo">187</span> }<a name="line.187"></a>
+<span class="sourceLineNo">188</span><a name="line.188"></a>
+<span class="sourceLineNo">189</span> public TimeRangeTracker getTimeRangeTracker() {<a name="line.189"></a>
+<span class="sourceLineNo">190</span> return timeRangeTracker;<a name="line.190"></a>
+<span class="sourceLineNo">191</span> }<a name="line.191"></a>
+<span class="sourceLineNo">192</span><a name="line.192"></a>
+<span class="sourceLineNo">193</span> protected void updateMetaInfo(Cell toAdd, long s) {<a name="line.193"></a>
+<span class="sourceLineNo">194</span> getTimeRangeTracker().includeTimestamp(toAdd);<a name="line.194"></a>
+<span class="sourceLineNo">195</span> size.addAndGet(s);<a name="line.195"></a>
+<span class="sourceLineNo">196</span> }<a name="line.196"></a>
+<span class="sourceLineNo">197</span><a name="line.197"></a>
+<span class="sourceLineNo">198</span> private MemStoreLAB getMemStoreLAB() {<a name="line.198"></a>
+<span class="sourceLineNo">199</span> return memStoreLAB;<a name="line.199"></a>
+<span class="sourceLineNo">200</span> }<a name="line.200"></a>
+<span class="sourceLineNo">201</span><a name="line.201"></a>
+<span class="sourceLineNo">202</span> // Debug methods<a name="line.202"></a>
+<span class="sourceLineNo">203</span> /**<a name="line.203"></a>
+<span class="sourceLineNo">204</span> * Dumps all cells of the segment into the given log<a name="line.204"></a>
+<span class="sourceLineNo">205</span> */<a name="line.205"></a>
+<span class="sourceLineNo">206</span> public abstract void dump(Log log);<a name="line.206"></a>
+<span class="sourceLineNo">207</span><a name="line.207"></a>
+<span class="sourceLineNo">208</span> @Override<a name="line.208"></a>
+<span class="sourceLineNo">209</span> public String toString() {<a name="line.209"></a>
+<span class="sourceLineNo">210</span> String res = "Store segment of type "+this.getClass().getName()+"; ";<a name="line.210"></a>
+<span class="sourceLineNo">211</span> res += "isEmpty "+(isEmpty()?"yes":"no")+"; ";<a name="line.211"></a>
+<span class="sourceLineNo">212</span> res += "cellCount "+getCellsCount()+"; ";<a name="line.212"></a>
+<span class="sourceLineNo">213</span> res += "size "+getSize()+"; ";<a name="line.213"></a>
+<span class="sourceLineNo">214</span> res += "Min ts "+getMinTimestamp()+"; ";<a name="line.214"></a>
+<span class="sourceLineNo">215</span> return res;<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>}<a name="line.218"></a>
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+</pre>
+</div>
+</body>
+</html>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/526c7822/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/SegmentFactory.html
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diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/SegmentFactory.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/SegmentFactory.html
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html lang="en">
+<head>
+<title>Source code</title>
+<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
+</head>
+<body>
+<div class="sourceContainer">
+<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
+<span class="sourceLineNo">002</span> *<a name="line.2"></a>
+<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a>
+<span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a>
+<span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a>
+<span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a>
+<span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a>
+<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a>
+<span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a>
+<span class="sourceLineNo">010</span> *<a name="line.10"></a>
+<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a>
+<span class="sourceLineNo">012</span> *<a name="line.12"></a>
+<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a>
+<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a>
+<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a>
+<span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a>
+<span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a>
+<span class="sourceLineNo">018</span> */<a name="line.18"></a>
+<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a>
+<span class="sourceLineNo">020</span><a name="line.20"></a>
+<span class="sourceLineNo">021</span>import org.apache.hadoop.conf.Configuration;<a name="line.21"></a>
+<span class="sourceLineNo">022</span>import org.apache.hadoop.hbase.CellComparator;<a name="line.22"></a>
+<span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.23"></a>
+<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.util.ReflectionUtils;<a name="line.24"></a>
+<span class="sourceLineNo">025</span><a name="line.25"></a>
+<span class="sourceLineNo">026</span>/**<a name="line.26"></a>
+<span class="sourceLineNo">027</span> * A singleton store segment factory.<a name="line.27"></a>
+<span class="sourceLineNo">028</span> * Generate concrete store segments.<a name="line.28"></a>
+<span class="sourceLineNo">029</span> */<a name="line.29"></a>
+<span class="sourceLineNo">030</span>@InterfaceAudience.Private<a name="line.30"></a>
+<span class="sourceLineNo">031</span>public final class SegmentFactory {<a name="line.31"></a>
+<span class="sourceLineNo">032</span><a name="line.32"></a>
+<span class="sourceLineNo">033</span> static final String USEMSLAB_KEY = "hbase.hregion.memstore.mslab.enabled";<a name="line.33"></a>
+<span class="sourceLineNo">034</span> static final boolean USEMSLAB_DEFAULT = true;<a name="line.34"></a>
+<span class="sourceLineNo">035</span> static final String MSLAB_CLASS_NAME = "hbase.regionserver.mslab.class";<a name="line.35"></a>
+<span class="sourceLineNo">036</span><a name="line.36"></a>
+<span class="sourceLineNo">037</span> private SegmentFactory() {}<a name="line.37"></a>
+<span class="sourceLineNo">038</span> private static SegmentFactory instance = new SegmentFactory();<a name="line.38"></a>
+<span class="sourceLineNo">039</span> public static SegmentFactory instance() {<a name="line.39"></a>
+<span class="sourceLineNo">040</span> return instance;<a name="line.40"></a>
+<span class="sourceLineNo">041</span> }<a name="line.41"></a>
+<span class="sourceLineNo">042</span><a name="line.42"></a>
+<span class="sourceLineNo">043</span> public ImmutableSegment createImmutableSegment(final Configuration conf,<a name="line.43"></a>
+<span class="sourceLineNo">044</span> final CellComparator comparator, long size) {<a name="line.44"></a>
+<span class="sourceLineNo">045</span> MemStoreLAB memStoreLAB = getMemStoreLAB(conf);<a name="line.45"></a>
+<span class="sourceLineNo">046</span> MutableSegment segment = generateMutableSegment(conf, comparator, memStoreLAB, size);<a name="line.46"></a>
+<span class="sourceLineNo">047</span> return createImmutableSegment(conf, segment);<a name="line.47"></a>
+<span class="sourceLineNo">048</span> }<a name="line.48"></a>
+<span class="sourceLineNo">049</span><a name="line.49"></a>
+<span class="sourceLineNo">050</span> public ImmutableSegment createImmutableSegment(CellComparator comparator,<a name="line.50"></a>
+<span class="sourceLineNo">051</span> long size) {<a name="line.51"></a>
+<span class="sourceLineNo">052</span> MutableSegment segment = generateMutableSegment(null, comparator, null, size);<a name="line.52"></a>
+<span class="sourceLineNo">053</span> return createImmutableSegment(null, segment);<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> public ImmutableSegment createImmutableSegment(final Configuration conf, MutableSegment segment) {<a name="line.56"></a>
+<span class="sourceLineNo">057</span> return generateImmutableSegment(conf, segment);<a name="line.57"></a>
+<span class="sourceLineNo">058</span> }<a name="line.58"></a>
+<span class="sourceLineNo">059</span> public MutableSegment createMutableSegment(final Configuration conf,<a name="line.59"></a>
+<span class="sourceLineNo">060</span> CellComparator comparator, long size) {<a name="line.60"></a>
+<span class="sourceLineNo">061</span> MemStoreLAB memStoreLAB = getMemStoreLAB(conf);<a name="line.61"></a>
+<span class="sourceLineNo">062</span> return generateMutableSegment(conf, comparator, memStoreLAB, size);<a name="line.62"></a>
+<span class="sourceLineNo">063</span> }<a name="line.63"></a>
+<span class="sourceLineNo">064</span><a name="line.64"></a>
+<span class="sourceLineNo">065</span> //****** private methods to instantiate concrete store segments **********//<a name="line.65"></a>
+<span class="sourceLineNo">066</span><a name="line.66"></a>
+<span class="sourceLineNo">067</span> private ImmutableSegment generateImmutableSegment(final Configuration conf,<a name="line.67"></a>
+<span class="sourceLineNo">068</span> MutableSegment segment) {<a name="line.68"></a>
+<span class="sourceLineNo">069</span> // TBD use configuration to set type of segment<a name="line.69"></a>
+<span class="sourceLineNo">070</span> return new ImmutableSegmentAdapter(segment);<a name="line.70"></a>
+<span class="sourceLineNo">071</span> }<a name="line.71"></a>
+<span class="sourceLineNo">072</span> private MutableSegment generateMutableSegment(<a name="line.72"></a>
+<span class="sourceLineNo">073</span> final Configuration conf, CellComparator comparator, MemStoreLAB memStoreLAB, long size) {<a name="line.73"></a>
+<span class="sourceLineNo">074</span> // TBD use configuration to set type of segment<a name="line.74"></a>
+<span class="sourceLineNo">075</span> CellSet set = new CellSet(comparator);<a name="line.75"></a>
+<span class="sourceLineNo">076</span> return new MutableCellSetSegment(set, memStoreLAB, size, comparator);<a name="line.76"></a>
+<span class="sourceLineNo">077</span> }<a name="line.77"></a>
+<span class="sourceLineNo">078</span><a name="line.78"></a>
+<span class="sourceLineNo">079</span> private MemStoreLAB getMemStoreLAB(Configuration conf) {<a name="line.79"></a>
+<span class="sourceLineNo">080</span> MemStoreLAB memStoreLAB = null;<a name="line.80"></a>
+<span class="sourceLineNo">081</span> if (conf.getBoolean(USEMSLAB_KEY, USEMSLAB_DEFAULT)) {<a name="line.81"></a>
+<span class="sourceLineNo">082</span> String className = conf.get(MSLAB_CLASS_NAME, HeapMemStoreLAB.class.getName());<a name="line.82"></a>
+<span class="sourceLineNo">083</span> memStoreLAB = ReflectionUtils.instantiateWithCustomCtor(className,<a name="line.83"></a>
+<span class="sourceLineNo">084</span> new Class[] { Configuration.class }, new Object[] { conf });<a name="line.84"></a>
+<span class="sourceLineNo">085</span> }<a name="line.85"></a>
+<span class="sourceLineNo">086</span> return memStoreLAB;<a name="line.86"></a>
+<span class="sourceLineNo">087</span> }<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>
+
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+</pre>
+</div>
+</body>
+</html>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/526c7822/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/SegmentScanner.html
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diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/SegmentScanner.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/SegmentScanner.html
new file mode 100644
index 0000000..ce4890c
--- /dev/null
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/SegmentScanner.html
@@ -0,0 +1,224 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html lang="en">
+<head>
+<title>Source code</title>
+<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
+</head>
+<body>
+<div class="sourceContainer">
+<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
+<span class="sourceLineNo">002</span> *<a name="line.2"></a>
+<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a>
+<span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a>
+<span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a>
+<span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a>
+<span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a>
+<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a>
+<span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a>
+<span class="sourceLineNo">010</span> *<a name="line.10"></a>
+<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a>
+<span class="sourceLineNo">012</span> *<a name="line.12"></a>
+<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a>
+<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a>
+<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a>
+<span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a>
+<span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a>
+<span class="sourceLineNo">018</span> */<a name="line.18"></a>
+<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a>
+<span class="sourceLineNo">020</span><a name="line.20"></a>
+<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
+<span class="sourceLineNo">022</span><a name="line.22"></a>
+<span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.Cell;<a name="line.23"></a>
+<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.24"></a>
+<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.25"></a>
+<span class="sourceLineNo">026</span><a name="line.26"></a>
+<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
+<span class="sourceLineNo">028</span> * An abstraction for store segment scanner.<a name="line.28"></a>
+<span class="sourceLineNo">029</span> */<a name="line.29"></a>
+<span class="sourceLineNo">030</span>@InterfaceAudience.Private<a name="line.30"></a>
+<span class="sourceLineNo">031</span>public abstract class SegmentScanner implements KeyValueScanner {<a name="line.31"></a>
+<span class="sourceLineNo">032</span><a name="line.32"></a>
+<span class="sourceLineNo">033</span> private long sequenceID = Long.MAX_VALUE;<a name="line.33"></a>
+<span class="sourceLineNo">034</span><a name="line.34"></a>
+<span class="sourceLineNo">035</span> protected abstract Segment getSegment();<a name="line.35"></a>
+<span class="sourceLineNo">036</span><a name="line.36"></a>
+<span class="sourceLineNo">037</span> /**<a name="line.37"></a>
+<span class="sourceLineNo">038</span> * Get the sequence id associated with this KeyValueScanner. This is required<a name="line.38"></a>
+<span class="sourceLineNo">039</span> * for comparing multiple files (or memstore segments) scanners to find out<a name="line.39"></a>
+<span class="sourceLineNo">040</span> * which one has the latest data.<a name="line.40"></a>
+<span class="sourceLineNo">041</span> *<a name="line.41"></a>
+<span class="sourceLineNo">042</span> */<a name="line.42"></a>
+<span class="sourceLineNo">043</span> @Override<a name="line.43"></a>
+<span class="sourceLineNo">044</span> public long getSequenceID() {<a name="line.44"></a>
+<span class="sourceLineNo">045</span> return sequenceID;<a name="line.45"></a>
+<span class="sourceLineNo">046</span> }<a name="line.46"></a>
+<span class="sourceLineNo">047</span><a name="line.47"></a>
+<span class="sourceLineNo">048</span> /**<a name="line.48"></a>
+<span class="sourceLineNo">049</span> * Close the KeyValue scanner.<a name="line.49"></a>
+<span class="sourceLineNo">050</span> */<a name="line.50"></a>
+<span class="sourceLineNo">051</span> @Override<a name="line.51"></a>
+<span class="sourceLineNo">052</span> public void close() {<a name="line.52"></a>
+<span class="sourceLineNo">053</span> getSegment().decScannerCount();<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> /**<a name="line.56"></a>
+<span class="sourceLineNo">057</span> * This functionality should be resolved in the higher level which is<a name="line.57"></a>
+<span class="sourceLineNo">058</span> * MemStoreScanner, currently returns true as default. Doesn't throw<a name="line.58"></a>
+<span class="sourceLineNo">059</span> * IllegalStateException in order not to change the signature of the<a name="line.59"></a>
+<span class="sourceLineNo">060</span> * overridden method<a name="line.60"></a>
+<span class="sourceLineNo">061</span> */<a name="line.61"></a>
+<span class="sourceLineNo">062</span> @Override<a name="line.62"></a>
+<span class="sourceLineNo">063</span> public boolean shouldUseScanner(Scan scan, Store store, long oldestUnexpiredTS) {<a name="line.63"></a>
+<span class="sourceLineNo">064</span> return true;<a name="line.64"></a>
+<span class="sourceLineNo">065</span> }<a name="line.65"></a>
+<span class="sourceLineNo">066</span> /**<a name="line.66"></a>
+<span class="sourceLineNo">067</span> * This scanner is working solely on the in-memory MemStore therefore this<a name="line.67"></a>
+<span class="sourceLineNo">068</span> * interface is not relevant.<a name="line.68"></a>
+<span class="sourceLineNo">069</span> */<a name="line.69"></a>
+<span class="sourceLineNo">070</span> @Override<a name="line.70"></a>
+<span class="sourceLineNo">071</span> public boolean requestSeek(Cell c, boolean forward, boolean useBloom)<a name="line.71"></a>
+<span class="sourceLineNo">072</span> throws IOException {<a name="line.72"></a>
+<span class="sourceLineNo">073</span><a name="line.73"></a>
+<span class="sourceLineNo">074</span> throw new IllegalStateException(<a name="line.74"></a>
+<span class="sourceLineNo">075</span> "requestSeek cannot be called on MutableCellSetSegmentScanner");<a name="line.75"></a>
+<span class="sourceLineNo">076</span> }<a name="line.76"></a>
+<span class="sourceLineNo">077</span><a name="line.77"></a>
+<span class="sourceLineNo">078</span> /**<a name="line.78"></a>
+<span class="sourceLineNo">079</span> * This scanner is working solely on the in-memory MemStore and doesn't work on<a name="line.79"></a>
+<span class="sourceLineNo">080</span> * store files, MutableCellSetSegmentScanner always does the seek,<a name="line.80"></a>
+<span class="sourceLineNo">081</span> * therefore always returning true.<a name="line.81"></a>
+<span class="sourceLineNo">082</span> */<a name="line.82"></a>
+<span class="sourceLineNo">083</span> @Override<a name="line.83"></a>
+<span class="sourceLineNo">084</span> public boolean realSeekDone() {<a name="line.84"></a>
+<span class="sourceLineNo">085</span> return true;<a name="line.85"></a>
+<span class="sourceLineNo">086</span> }<a name="line.86"></a>
+<span class="sourceLineNo">087</span><a name="line.87"></a>
+<span class="sourceLineNo">088</span> /**<a name="line.88"></a>
+<span class="sourceLineNo">089</span> * This function should be never called on scanners that always do real seek operations (i.e. most<a name="line.89"></a>
+<span class="sourceLineNo">090</span> * of the scanners and also this one). The easiest way to achieve this is to call<a name="line.90"></a>
+<span class="sourceLineNo">091</span> * {@link #realSeekDone()} first.<a name="line.91"></a>
+<span class="sourceLineNo">092</span> */<a name="line.92"></a>
+<span class="sourceLineNo">093</span> @Override<a name="line.93"></a>
+<span class="sourceLineNo">094</span> public void enforceSeek() throws IOException {<a name="line.94"></a>
+<span class="sourceLineNo">095</span> throw new IllegalStateException(<a name="line.95"></a>
+<span class="sourceLineNo">096</span> "enforceSeek cannot be called on MutableCellSetSegmentScanner");<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> * @return true if this is a file scanner. Otherwise a memory scanner is assumed.<a name="line.100"></a>
+<span class="sourceLineNo">101</span> */<a name="line.101"></a>
+<span class="sourceLineNo">102</span> @Override<a name="line.102"></a>
+<span class="sourceLineNo">103</span> public boolean isFileScanner() {<a name="line.103"></a>
+<span class="sourceLineNo">104</span> return false;<a name="line.104"></a>
+<span class="sourceLineNo">105</span> }<a name="line.105"></a>
+<span class="sourceLineNo">106</span><a name="line.106"></a>
+<span class="sourceLineNo">107</span> /**<a name="line.107"></a>
+<span class="sourceLineNo">108</span> * @return the next key in the index (the key to seek to the next block)<a name="line.108"></a>
+<span class="sourceLineNo">109</span> * if known, or null otherwise<a name="line.109"></a>
+<span class="sourceLineNo">110</span> * Not relevant for in-memory scanner<a name="line.110"></a>
+<span class="sourceLineNo">111</span> */<a name="line.111"></a>
+<span class="sourceLineNo">112</span> @Override<a name="line.112"></a>
+<span class="sourceLineNo">113</span> public Cell getNextIndexedKey() {<a name="line.113"></a>
+<span class="sourceLineNo">114</span> return null;<a name="line.114"></a>
+<span class="sourceLineNo">115</span> }<a name="line.115"></a>
+<span class="sourceLineNo">116</span><a name="line.116"></a>
+<span class="sourceLineNo">117</span> /**<a name="line.117"></a>
+<span class="sourceLineNo">118</span> * Called after a batch of rows scanned (RPC) and set to be returned to client. Any in between<a name="line.118"></a>
+<span class="sourceLineNo">119</span> * cleanup can be done here. Nothing to be done for MutableCellSetSegmentScanner.<a name="line.119"></a>
+<span class="sourceLineNo">120</span> */<a name="line.120"></a>
+<span class="sourceLineNo">121</span> @Override<a name="line.121"></a>
+<span class="sourceLineNo">122</span> public void shipped() throws IOException {<a name="line.122"></a>
+<span class="sourceLineNo">123</span> // do nothing<a name="line.123"></a>
+<span class="sourceLineNo">124</span> }<a name="line.124"></a>
+<span class="sourceLineNo">125</span><a name="line.125"></a>
+<span class="sourceLineNo">126</span> /**<a name="line.126"></a>
+<span class="sourceLineNo">127</span> * Set the sequence id of the scanner.<a name="line.127"></a>
+<span class="sourceLineNo">128</span> * This is used to determine an order between memory segment scanners.<a name="line.128"></a>
+<span class="sourceLineNo">129</span> * @param x a unique sequence id<a name="line.129"></a>
+<span class="sourceLineNo">130</span> */<a name="line.130"></a>
+<span class="sourceLineNo">131</span> public void setSequenceID(long x) {<a name="line.131"></a>
+<span class="sourceLineNo">132</span> sequenceID = x;<a name="line.132"></a>
+<span class="sourceLineNo">133</span> }<a name="line.133"></a>
+<span class="sourceLineNo">134</span><a name="line.134"></a>
+<span class="sourceLineNo">135</span> /**<a name="line.135"></a>
+<span class="sourceLineNo">136</span> * Returns whether the given scan should seek in this segment<a name="line.136"></a>
+<span class="sourceLineNo">137</span> * @return whether the given scan should seek in this segment<a name="line.137"></a>
+<span class="sourceLineNo">138</span> */<a name="line.138"></a>
+<span class="sourceLineNo">139</span> public boolean shouldSeek(Scan scan, long oldestUnexpiredTS) {<a name="line.139"></a>
+<span class="sourceLineNo">140</span> return getSegment().shouldSeek(scan,oldestUnexpiredTS);<a name="line.140"></a>
+<span class="sourceLineNo">141</span> }<a name="line.141"></a>
+<span class="sourceLineNo">142</span><a name="line.142"></a>
+<span class="sourceLineNo">143</span> //debug method<a name="line.143"></a>
+<span class="sourceLineNo">144</span> @Override<a name="line.144"></a>
+<span class="sourceLineNo">145</span> public String toString() {<a name="line.145"></a>
+<span class="sourceLineNo">146</span> String res = "Store segment scanner of type "+this.getClass().getName()+"; ";<a name="line.146"></a>
+<span class="sourceLineNo">147</span> res += "sequence id "+getSequenceID()+"; ";<a name="line.147"></a>
+<span class="sourceLineNo">148</span> res += getSegment().toString();<a name="line.148"></a>
+<span class="sourceLineNo">149</span> return res;<a name="line.149"></a>
+<span class="sourceLineNo">150</span> }<a name="line.150"></a>
+<span class="sourceLineNo">151</span><a name="line.151"></a>
+<span class="sourceLineNo">152</span>}<a name="line.152"></a>
+
+
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+
+
+</pre>
+</div>
+</body>
+</html>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/526c7822/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreFlushContext.html
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diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreFlushContext.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreFlushContext.html
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--- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreFlushContext.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreFlushContext.html
@@ -29,8 +29,8 @@
<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.List;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
-<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.24"></a>
-<span class="sourceLineNo">025</span>import org.apache.hadoop.fs.Path;<a name="line.25"></a>
+<span class="sourceLineNo">024</span>import org.apache.hadoop.fs.Path;<a name="line.24"></a>
+<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.monitoring.MonitoredTask;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>/**<a name="line.28"></a>