http://git-wip-us.apache.org/repos/asf/hbase-site/blob/6b4bae59/devapidocs/src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html
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diff --git
a/devapidocs/src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html
b/devapidocs/src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html
index b870884..30b3ad0 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html
@@ -28,346 +28,347 @@
<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>import java.nio.ByteBuffer;<a
name="line.22"></a>
-<span class="sourceLineNo">023</span><a name="line.23"></a>
-<span class="sourceLineNo">024</span>import org.apache.commons.logging.Log;<a
name="line.24"></a>
-<span class="sourceLineNo">025</span>import
org.apache.commons.logging.LogFactory;<a name="line.25"></a>
-<span class="sourceLineNo">026</span>import
org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import
org.apache.hadoop.conf.Configuration;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import org.apache.hadoop.fs.FileSystem;<a
name="line.28"></a>
-<span class="sourceLineNo">029</span>import org.apache.hadoop.fs.Path;<a
name="line.29"></a>
-<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.Cell;<a
name="line.30"></a>
-<span class="sourceLineNo">031</span>import
org.apache.hadoop.hbase.HConstants;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import
org.apache.hadoop.hbase.KeyValue;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import
org.apache.hadoop.hbase.client.Scan;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import
org.apache.hadoop.hbase.io.hfile.CacheConfig;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import
org.apache.hadoop.hbase.io.hfile.HFileScanner;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import
org.apache.hadoop.hbase.regionserver.StoreFileReader;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import
org.apache.hadoop.hbase.util.Bytes;<a name="line.37"></a>
-<span class="sourceLineNo">038</span><a name="line.38"></a>
-<span class="sourceLineNo">039</span>/**<a name="line.39"></a>
-<span class="sourceLineNo">040</span> * A facade for a {@link
org.apache.hadoop.hbase.io.hfile.HFile.Reader} that serves up<a
name="line.40"></a>
-<span class="sourceLineNo">041</span> * either the top or bottom half of a
HFile where 'bottom' is the first half<a name="line.41"></a>
-<span class="sourceLineNo">042</span> * of the file containing the keys that
sort lowest and 'top' is the second half<a name="line.42"></a>
-<span class="sourceLineNo">043</span> * of the file with keys that sort
greater than those of the bottom half.<a name="line.43"></a>
-<span class="sourceLineNo">044</span> * The top includes the split files
midkey, of the key that follows if it does<a name="line.44"></a>
-<span class="sourceLineNo">045</span> * not exist in the file.<a
name="line.45"></a>
-<span class="sourceLineNo">046</span> *<a name="line.46"></a>
-<span class="sourceLineNo">047</span> * <p>This type works in tandem
with the {@link Reference} type. This class<a name="line.47"></a>
-<span class="sourceLineNo">048</span> * is used reading while Reference is
used writing.<a name="line.48"></a>
-<span class="sourceLineNo">049</span> *<a name="line.49"></a>
-<span class="sourceLineNo">050</span> * <p>This file is not splitable.
Calls to {@link #midkey()} return null.<a name="line.50"></a>
-<span class="sourceLineNo">051</span> */<a name="line.51"></a>
-<span class="sourceLineNo">052</span>@InterfaceAudience.Private<a
name="line.52"></a>
-<span class="sourceLineNo">053</span>public class HalfStoreFileReader extends
StoreFileReader {<a name="line.53"></a>
-<span class="sourceLineNo">054</span> private static final Log LOG =
LogFactory.getLog(HalfStoreFileReader.class);<a name="line.54"></a>
-<span class="sourceLineNo">055</span> final boolean top;<a name="line.55"></a>
-<span class="sourceLineNo">056</span> // This is the key we split around.
Its the first possible entry on a row:<a name="line.56"></a>
-<span class="sourceLineNo">057</span> // i.e. empty column and a timestamp of
LATEST_TIMESTAMP.<a name="line.57"></a>
-<span class="sourceLineNo">058</span> protected final byte [] splitkey;<a
name="line.58"></a>
-<span class="sourceLineNo">059</span><a name="line.59"></a>
-<span class="sourceLineNo">060</span> protected final Cell splitCell;<a
name="line.60"></a>
-<span class="sourceLineNo">061</span><a name="line.61"></a>
-<span class="sourceLineNo">062</span> private Cell firstKey = null;<a
name="line.62"></a>
-<span class="sourceLineNo">063</span><a name="line.63"></a>
-<span class="sourceLineNo">064</span> private boolean firstKeySeeked =
false;<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> * Creates a half file reader for a
normal hfile.<a name="line.67"></a>
-<span class="sourceLineNo">068</span> * @param fs fileystem to read from<a
name="line.68"></a>
-<span class="sourceLineNo">069</span> * @param p path to hfile<a
name="line.69"></a>
-<span class="sourceLineNo">070</span> * @param cacheConf<a
name="line.70"></a>
-<span class="sourceLineNo">071</span> * @param r original reference file
(contains top or bottom)<a name="line.71"></a>
-<span class="sourceLineNo">072</span> * @param conf Configuration<a
name="line.72"></a>
-<span class="sourceLineNo">073</span> * @throws IOException<a
name="line.73"></a>
-<span class="sourceLineNo">074</span> */<a name="line.74"></a>
-<span class="sourceLineNo">075</span> public HalfStoreFileReader(final
FileSystem fs, final Path p,<a name="line.75"></a>
-<span class="sourceLineNo">076</span> final CacheConfig cacheConf, final
Reference r, final Configuration conf)<a name="line.76"></a>
-<span class="sourceLineNo">077</span> throws IOException {<a
name="line.77"></a>
-<span class="sourceLineNo">078</span> super(fs, p, cacheConf, conf);<a
name="line.78"></a>
-<span class="sourceLineNo">079</span> // This is not actual midkey for this
half-file; its just border<a name="line.79"></a>
-<span class="sourceLineNo">080</span> // around which we split top and
bottom. Have to look in files to find<a name="line.80"></a>
-<span class="sourceLineNo">081</span> // actual last and first keys for
bottom and top halves. Half-files don't<a name="line.81"></a>
-<span class="sourceLineNo">082</span> // have an actual midkey themselves.
No midkey is how we indicate file is<a name="line.82"></a>
-<span class="sourceLineNo">083</span> // not splittable.<a
name="line.83"></a>
-<span class="sourceLineNo">084</span> this.splitkey = r.getSplitKey();<a
name="line.84"></a>
-<span class="sourceLineNo">085</span> this.splitCell = new
KeyValue.KeyOnlyKeyValue(this.splitkey, 0, this.splitkey.length);<a
name="line.85"></a>
-<span class="sourceLineNo">086</span> // Is it top or bottom half?<a
name="line.86"></a>
-<span class="sourceLineNo">087</span> this.top =
Reference.isTopFileRegion(r.getFileRegion());<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> /**<a name="line.90"></a>
-<span class="sourceLineNo">091</span> * Creates a half file reader for a
hfile referred to by an hfilelink.<a name="line.91"></a>
-<span class="sourceLineNo">092</span> * @param fs fileystem to read from<a
name="line.92"></a>
-<span class="sourceLineNo">093</span> * @param p path to hfile<a
name="line.93"></a>
-<span class="sourceLineNo">094</span> * @param in {@link
FSDataInputStreamWrapper}<a name="line.94"></a>
-<span class="sourceLineNo">095</span> * @param size Full size of the hfile
file<a name="line.95"></a>
-<span class="sourceLineNo">096</span> * @param cacheConf<a
name="line.96"></a>
-<span class="sourceLineNo">097</span> * @param r original reference file
(contains top or bottom)<a name="line.97"></a>
-<span class="sourceLineNo">098</span> * @param conf Configuration<a
name="line.98"></a>
-<span class="sourceLineNo">099</span> * @throws IOException<a
name="line.99"></a>
-<span class="sourceLineNo">100</span> */<a name="line.100"></a>
-<span class="sourceLineNo">101</span> public HalfStoreFileReader(final
FileSystem fs, final Path p, final FSDataInputStreamWrapper in,<a
name="line.101"></a>
-<span class="sourceLineNo">102</span> long size, final CacheConfig
cacheConf, final Reference r, final Configuration conf)<a name="line.102"></a>
-<span class="sourceLineNo">103</span> throws IOException {<a
name="line.103"></a>
-<span class="sourceLineNo">104</span> super(fs, p, in, size, cacheConf,
conf);<a name="line.104"></a>
-<span class="sourceLineNo">105</span> // This is not actual midkey for this
half-file; its just border<a name="line.105"></a>
-<span class="sourceLineNo">106</span> // around which we split top and
bottom. Have to look in files to find<a name="line.106"></a>
-<span class="sourceLineNo">107</span> // actual last and first keys for
bottom and top halves. Half-files don't<a name="line.107"></a>
-<span class="sourceLineNo">108</span> // have an actual midkey themselves.
No midkey is how we indicate file is<a name="line.108"></a>
-<span class="sourceLineNo">109</span> // not splittable.<a
name="line.109"></a>
-<span class="sourceLineNo">110</span> this.splitkey = r.getSplitKey();<a
name="line.110"></a>
-<span class="sourceLineNo">111</span> this.splitCell = new
KeyValue.KeyOnlyKeyValue(this.splitkey, 0, this.splitkey.length);<a
name="line.111"></a>
-<span class="sourceLineNo">112</span> // Is it top or bottom half?<a
name="line.112"></a>
-<span class="sourceLineNo">113</span> this.top =
Reference.isTopFileRegion(r.getFileRegion());<a name="line.113"></a>
-<span class="sourceLineNo">114</span> }<a name="line.114"></a>
-<span class="sourceLineNo">115</span><a name="line.115"></a>
-<span class="sourceLineNo">116</span> protected boolean isTop() {<a
name="line.116"></a>
-<span class="sourceLineNo">117</span> return this.top;<a
name="line.117"></a>
-<span class="sourceLineNo">118</span> }<a name="line.118"></a>
-<span class="sourceLineNo">119</span><a name="line.119"></a>
-<span class="sourceLineNo">120</span> @Override<a name="line.120"></a>
-<span class="sourceLineNo">121</span> public HFileScanner getScanner(final
boolean cacheBlocks,<a name="line.121"></a>
-<span class="sourceLineNo">122</span> final boolean pread, final boolean
isCompaction) {<a name="line.122"></a>
-<span class="sourceLineNo">123</span> final HFileScanner s =
super.getScanner(cacheBlocks, pread, isCompaction);<a name="line.123"></a>
-<span class="sourceLineNo">124</span> return new HFileScanner() {<a
name="line.124"></a>
-<span class="sourceLineNo">125</span> final HFileScanner delegate = s;<a
name="line.125"></a>
-<span class="sourceLineNo">126</span> public boolean atEnd = false;<a
name="line.126"></a>
-<span class="sourceLineNo">127</span><a name="line.127"></a>
-<span class="sourceLineNo">128</span> public Cell getKey() {<a
name="line.128"></a>
-<span class="sourceLineNo">129</span> if (atEnd) return null;<a
name="line.129"></a>
-<span class="sourceLineNo">130</span> return delegate.getKey();<a
name="line.130"></a>
-<span class="sourceLineNo">131</span> }<a name="line.131"></a>
-<span class="sourceLineNo">132</span><a name="line.132"></a>
-<span class="sourceLineNo">133</span> public String getKeyString() {<a
name="line.133"></a>
-<span class="sourceLineNo">134</span> if (atEnd) return null;<a
name="line.134"></a>
-<span class="sourceLineNo">135</span><a name="line.135"></a>
-<span class="sourceLineNo">136</span> return delegate.getKeyString();<a
name="line.136"></a>
-<span class="sourceLineNo">137</span> }<a name="line.137"></a>
-<span class="sourceLineNo">138</span><a name="line.138"></a>
-<span class="sourceLineNo">139</span> public ByteBuffer getValue() {<a
name="line.139"></a>
-<span class="sourceLineNo">140</span> if (atEnd) return null;<a
name="line.140"></a>
-<span class="sourceLineNo">141</span><a name="line.141"></a>
-<span class="sourceLineNo">142</span> return delegate.getValue();<a
name="line.142"></a>
-<span class="sourceLineNo">143</span> }<a name="line.143"></a>
-<span class="sourceLineNo">144</span><a name="line.144"></a>
-<span class="sourceLineNo">145</span> public String getValueString() {<a
name="line.145"></a>
-<span class="sourceLineNo">146</span> if (atEnd) return null;<a
name="line.146"></a>
-<span class="sourceLineNo">147</span><a name="line.147"></a>
-<span class="sourceLineNo">148</span> return
delegate.getValueString();<a name="line.148"></a>
-<span class="sourceLineNo">149</span> }<a name="line.149"></a>
-<span class="sourceLineNo">150</span><a name="line.150"></a>
-<span class="sourceLineNo">151</span> public Cell getCell() {<a
name="line.151"></a>
-<span class="sourceLineNo">152</span> if (atEnd) return null;<a
name="line.152"></a>
-<span class="sourceLineNo">153</span><a name="line.153"></a>
-<span class="sourceLineNo">154</span> return delegate.getCell();<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> public boolean next() throws
IOException {<a name="line.157"></a>
-<span class="sourceLineNo">158</span> if (atEnd) return false;<a
name="line.158"></a>
-<span class="sourceLineNo">159</span><a name="line.159"></a>
-<span class="sourceLineNo">160</span> boolean b = delegate.next();<a
name="line.160"></a>
-<span class="sourceLineNo">161</span> if (!b) {<a name="line.161"></a>
-<span class="sourceLineNo">162</span> return b;<a name="line.162"></a>
-<span class="sourceLineNo">163</span> }<a name="line.163"></a>
-<span class="sourceLineNo">164</span> // constrain the bottom.<a
name="line.164"></a>
-<span class="sourceLineNo">165</span> if (!top) {<a name="line.165"></a>
-<span class="sourceLineNo">166</span> if
(getComparator().compare(splitCell, getKey()) <= 0) {<a name="line.166"></a>
-<span class="sourceLineNo">167</span> atEnd = true;<a
name="line.167"></a>
-<span class="sourceLineNo">168</span> return false;<a
name="line.168"></a>
-<span class="sourceLineNo">169</span> }<a name="line.169"></a>
-<span class="sourceLineNo">170</span> }<a name="line.170"></a>
-<span class="sourceLineNo">171</span> return true;<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> @Override<a name="line.174"></a>
-<span class="sourceLineNo">175</span> public boolean seekTo() throws
IOException {<a name="line.175"></a>
-<span class="sourceLineNo">176</span> if (top) {<a name="line.176"></a>
-<span class="sourceLineNo">177</span> int r =
this.delegate.seekTo(splitCell);<a name="line.177"></a>
-<span class="sourceLineNo">178</span> if (r ==
HConstants.INDEX_KEY_MAGIC) {<a name="line.178"></a>
-<span class="sourceLineNo">179</span> return true;<a
name="line.179"></a>
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-<span class="sourceLineNo">181</span> if (r < 0) {<a
name="line.181"></a>
-<span class="sourceLineNo">182</span> // midkey is < first key
in file<a name="line.182"></a>
-<span class="sourceLineNo">183</span> return
this.delegate.seekTo();<a name="line.183"></a>
-<span class="sourceLineNo">184</span> }<a name="line.184"></a>
-<span class="sourceLineNo">185</span> if (r > 0) {<a
name="line.185"></a>
-<span class="sourceLineNo">186</span> return
this.delegate.next();<a name="line.186"></a>
-<span class="sourceLineNo">187</span> }<a name="line.187"></a>
-<span class="sourceLineNo">188</span> return true;<a
name="line.188"></a>
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-<span class="sourceLineNo">190</span><a name="line.190"></a>
-<span class="sourceLineNo">191</span> boolean b = delegate.seekTo();<a
name="line.191"></a>
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-<span class="sourceLineNo">193</span> return b;<a name="line.193"></a>
-<span class="sourceLineNo">194</span> }<a name="line.194"></a>
-<span class="sourceLineNo">195</span> // Check key.<a
name="line.195"></a>
-<span class="sourceLineNo">196</span> return
(this.delegate.getReader().getComparator().compare(splitCell, getKey())) >
0;<a name="line.196"></a>
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-<span class="sourceLineNo">198</span><a name="line.198"></a>
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org.apache.hadoop.hbase.io.hfile.HFile.Reader getReader() {<a
name="line.199"></a>
-<span class="sourceLineNo">200</span> return
this.delegate.getReader();<a name="line.200"></a>
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name="line.203"></a>
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this.delegate.isSeeked();<a name="line.204"></a>
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IOException {<a name="line.208"></a>
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-<span class="sourceLineNo">210</span> if
(getComparator().compareKeyIgnoresMvcc(key, splitCell) < 0) {<a
name="line.210"></a>
-<span class="sourceLineNo">211</span> return -1;<a
name="line.211"></a>
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(getComparator().compareKeyIgnoresMvcc(key, splitCell) >= 0) {<a
name="line.214"></a>
-<span class="sourceLineNo">215</span> // we would place the scanner
in the second half.<a name="line.215"></a>
-<span class="sourceLineNo">216</span> // it might be an error to
return false here ever...<a name="line.216"></a>
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delegate.seekBefore(splitCell);<a name="line.217"></a>
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name="line.218"></a>
-<span class="sourceLineNo">219</span> throw new IOException(<a
name="line.219"></a>
-<span class="sourceLineNo">220</span> "Seeking for a key in
bottom of file, but key exists in top of file, " +<a name="line.220"></a>
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seekBefore(midkey)");<a name="line.221"></a>
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name="line.223"></a>
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name="line.226"></a>
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throws IOException {<a name="line.230"></a>
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the corresponding seekTo function<a name="line.231"></a>
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seekTo) on the delegate.<a name="line.233"></a>
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(getComparator().compareKeyIgnoresMvcc(key, splitCell) < 0) {<a
name="line.235"></a>
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(getComparator().compareKeyIgnoresMvcc(key, splitCell) >= 0) {<a
name="line.239"></a>
-<span class="sourceLineNo">240</span> // we would place the scanner
in the second half.<a name="line.240"></a>
-<span class="sourceLineNo">241</span> // it might be an error to
return false here ever...<a name="line.241"></a>
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delegate.seekBefore(splitCell);<a name="line.242"></a>
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name="line.243"></a>
-<span class="sourceLineNo">244</span> throw new
IOException("Seeking for a key in bottom of file, but"<a name="line.244"></a>
-<span class="sourceLineNo">245</span> + " key exists in top
of file, failed on seekBefore(midkey)");<a name="line.245"></a>
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name="line.250"></a>
-<span class="sourceLineNo">251</span> // skip the 'reseek' and just
return 1.<a name="line.251"></a>
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IOException {<a name="line.293"></a>
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name="line.307"></a>
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block and that uses pread.<a name="line.309"></a>
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getScanner(true, true);<a name="line.310"></a>
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-<span class="sourceLineNo">312</span> if
(scanner.seekBefore(this.splitCell)) {<a name="line.312"></a>
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name="line.313"></a>
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-<span class="sourceLineNo">315</span> } catch (IOException e) {<a
name="line.315"></a>
-<span class="sourceLineNo">316</span> LOG.warn("Failed seekBefore " +
Bytes.toStringBinary(this.splitkey), e);<a name="line.316"></a>
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-<span class="sourceLineNo">318</span> if (scanner != null) {<a
name="line.318"></a>
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{<a name="line.326"></a>
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not splitable.<a name="line.327"></a>
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name="line.332"></a>
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name="line.333"></a>
-<span class="sourceLineNo">334</span> HFileScanner scanner =
getScanner(true, true, false);<a name="line.334"></a>
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-<span class="sourceLineNo">336</span> if (scanner.seekTo()) {<a
name="line.336"></a>
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scanner.getKey();<a name="line.337"></a>
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name="line.339"></a>
-<span class="sourceLineNo">340</span> } catch (IOException e) {<a
name="line.340"></a>
-<span class="sourceLineNo">341</span> LOG.warn("Failed seekTo first KV
in the file", e);<a name="line.341"></a>
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name="line.343"></a>
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name="line.352"></a>
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half the original file; this may be wildly inaccurate.<a name="line.353"></a>
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name="line.358"></a>
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half the original file; this may be wildly inaccurate.<a name="line.359"></a>
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2;<a name="line.360"></a>
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-<span class="sourceLineNo">362</span>}<a name="line.362"></a>
+<span class="sourceLineNo">023</span>import
java.util.concurrent.atomic.AtomicInteger;<a name="line.23"></a>
+<span class="sourceLineNo">024</span><a name="line.24"></a>
+<span class="sourceLineNo">025</span>import org.apache.commons.logging.Log;<a
name="line.25"></a>
+<span class="sourceLineNo">026</span>import
org.apache.commons.logging.LogFactory;<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.conf.Configuration;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import org.apache.hadoop.fs.FileSystem;<a
name="line.29"></a>
+<span class="sourceLineNo">030</span>import org.apache.hadoop.fs.Path;<a
name="line.30"></a>
+<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.Cell;<a
name="line.31"></a>
+<span class="sourceLineNo">032</span>import
org.apache.hadoop.hbase.HConstants;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import
org.apache.hadoop.hbase.KeyValue;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import
org.apache.hadoop.hbase.client.Scan;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import
org.apache.hadoop.hbase.io.hfile.CacheConfig;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import
org.apache.hadoop.hbase.io.hfile.HFileScanner;<a name="line.36"></a>
+<span class="sourceLineNo">037</span>import
org.apache.hadoop.hbase.regionserver.StoreFileReader;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import
org.apache.hadoop.hbase.util.Bytes;<a name="line.38"></a>
+<span class="sourceLineNo">039</span><a name="line.39"></a>
+<span class="sourceLineNo">040</span>/**<a name="line.40"></a>
+<span class="sourceLineNo">041</span> * A facade for a {@link
org.apache.hadoop.hbase.io.hfile.HFile.Reader} that serves up<a
name="line.41"></a>
+<span class="sourceLineNo">042</span> * either the top or bottom half of a
HFile where 'bottom' is the first half<a name="line.42"></a>
+<span class="sourceLineNo">043</span> * of the file containing the keys that
sort lowest and 'top' is the second half<a name="line.43"></a>
+<span class="sourceLineNo">044</span> * of the file with keys that sort
greater than those of the bottom half.<a name="line.44"></a>
+<span class="sourceLineNo">045</span> * The top includes the split files
midkey, of the key that follows if it does<a name="line.45"></a>
+<span class="sourceLineNo">046</span> * not exist in the file.<a
name="line.46"></a>
+<span class="sourceLineNo">047</span> *<a name="line.47"></a>
+<span class="sourceLineNo">048</span> * <p>This type works in tandem
with the {@link Reference} type. This class<a name="line.48"></a>
+<span class="sourceLineNo">049</span> * is used reading while Reference is
used writing.<a name="line.49"></a>
+<span class="sourceLineNo">050</span> *<a name="line.50"></a>
+<span class="sourceLineNo">051</span> * <p>This file is not splitable.
Calls to {@link #midkey()} return null.<a name="line.51"></a>
+<span class="sourceLineNo">052</span> */<a name="line.52"></a>
+<span class="sourceLineNo">053</span>@InterfaceAudience.Private<a
name="line.53"></a>
+<span class="sourceLineNo">054</span>public class HalfStoreFileReader extends
StoreFileReader {<a name="line.54"></a>
+<span class="sourceLineNo">055</span> private static final Log LOG =
LogFactory.getLog(HalfStoreFileReader.class);<a name="line.55"></a>
+<span class="sourceLineNo">056</span> final boolean top;<a name="line.56"></a>
+<span class="sourceLineNo">057</span> // This is the key we split around.
Its the first possible entry on a row:<a name="line.57"></a>
+<span class="sourceLineNo">058</span> // i.e. empty column and a timestamp of
LATEST_TIMESTAMP.<a name="line.58"></a>
+<span class="sourceLineNo">059</span> protected final byte [] splitkey;<a
name="line.59"></a>
+<span class="sourceLineNo">060</span><a name="line.60"></a>
+<span class="sourceLineNo">061</span> protected final Cell splitCell;<a
name="line.61"></a>
+<span class="sourceLineNo">062</span><a name="line.62"></a>
+<span class="sourceLineNo">063</span> private Cell firstKey = null;<a
name="line.63"></a>
+<span class="sourceLineNo">064</span><a name="line.64"></a>
+<span class="sourceLineNo">065</span> private boolean firstKeySeeked =
false;<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> * Creates a half file reader for a
normal hfile.<a name="line.68"></a>
+<span class="sourceLineNo">069</span> * @param fs fileystem to read from<a
name="line.69"></a>
+<span class="sourceLineNo">070</span> * @param p path to hfile<a
name="line.70"></a>
+<span class="sourceLineNo">071</span> * @param cacheConf<a
name="line.71"></a>
+<span class="sourceLineNo">072</span> * @param r original reference file
(contains top or bottom)<a name="line.72"></a>
+<span class="sourceLineNo">073</span> * @param conf Configuration<a
name="line.73"></a>
+<span class="sourceLineNo">074</span> * @throws IOException<a
name="line.74"></a>
+<span class="sourceLineNo">075</span> */<a name="line.75"></a>
+<span class="sourceLineNo">076</span> public HalfStoreFileReader(FileSystem
fs, Path p, CacheConfig cacheConf, Reference r,<a name="line.76"></a>
+<span class="sourceLineNo">077</span> boolean isPrimaryReplicaStoreFile,
AtomicInteger refCount, boolean shared, Configuration conf)<a
name="line.77"></a>
+<span class="sourceLineNo">078</span> throws IOException {<a
name="line.78"></a>
+<span class="sourceLineNo">079</span> super(fs, p, cacheConf,
isPrimaryReplicaStoreFile, refCount, shared, conf);<a name="line.79"></a>
+<span class="sourceLineNo">080</span> // This is not actual midkey for this
half-file; its just border<a name="line.80"></a>
+<span class="sourceLineNo">081</span> // around which we split top and
bottom. Have to look in files to find<a name="line.81"></a>
+<span class="sourceLineNo">082</span> // actual last and first keys for
bottom and top halves. Half-files don't<a name="line.82"></a>
+<span class="sourceLineNo">083</span> // have an actual midkey themselves.
No midkey is how we indicate file is<a name="line.83"></a>
+<span class="sourceLineNo">084</span> // not splittable.<a
name="line.84"></a>
+<span class="sourceLineNo">085</span> this.splitkey = r.getSplitKey();<a
name="line.85"></a>
+<span class="sourceLineNo">086</span> this.splitCell = new
KeyValue.KeyOnlyKeyValue(this.splitkey, 0, this.splitkey.length);<a
name="line.86"></a>
+<span class="sourceLineNo">087</span> // Is it top or bottom half?<a
name="line.87"></a>
+<span class="sourceLineNo">088</span> this.top =
Reference.isTopFileRegion(r.getFileRegion());<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> /**<a name="line.91"></a>
+<span class="sourceLineNo">092</span> * Creates a half file reader for a
hfile referred to by an hfilelink.<a name="line.92"></a>
+<span class="sourceLineNo">093</span> * @param fs fileystem to read from<a
name="line.93"></a>
+<span class="sourceLineNo">094</span> * @param p path to hfile<a
name="line.94"></a>
+<span class="sourceLineNo">095</span> * @param in {@link
FSDataInputStreamWrapper}<a name="line.95"></a>
+<span class="sourceLineNo">096</span> * @param size Full size of the hfile
file<a name="line.96"></a>
+<span class="sourceLineNo">097</span> * @param cacheConf<a
name="line.97"></a>
+<span class="sourceLineNo">098</span> * @param r original reference file
(contains top or bottom)<a name="line.98"></a>
+<span class="sourceLineNo">099</span> * @param conf Configuration<a
name="line.99"></a>
+<span class="sourceLineNo">100</span> * @throws IOException<a
name="line.100"></a>
+<span class="sourceLineNo">101</span> */<a name="line.101"></a>
+<span class="sourceLineNo">102</span> public HalfStoreFileReader(final
FileSystem fs, final Path p, final FSDataInputStreamWrapper in,<a
name="line.102"></a>
+<span class="sourceLineNo">103</span> long size, final CacheConfig
cacheConf, final Reference r, boolean isPrimaryReplicaStoreFile,<a
name="line.103"></a>
+<span class="sourceLineNo">104</span> AtomicInteger refCount, boolean
shared, final Configuration conf) throws IOException {<a name="line.104"></a>
+<span class="sourceLineNo">105</span> super(fs, p, in, size, cacheConf,
isPrimaryReplicaStoreFile, refCount, shared, conf);<a name="line.105"></a>
+<span class="sourceLineNo">106</span> // This is not actual midkey for this
half-file; its just border<a name="line.106"></a>
+<span class="sourceLineNo">107</span> // around which we split top and
bottom. Have to look in files to find<a name="line.107"></a>
+<span class="sourceLineNo">108</span> // actual last and first keys for
bottom and top halves. Half-files don't<a name="line.108"></a>
+<span class="sourceLineNo">109</span> // have an actual midkey themselves.
No midkey is how we indicate file is<a name="line.109"></a>
+<span class="sourceLineNo">110</span> // not splittable.<a
name="line.110"></a>
+<span class="sourceLineNo">111</span> this.splitkey = r.getSplitKey();<a
name="line.111"></a>
+<span class="sourceLineNo">112</span> this.splitCell = new
KeyValue.KeyOnlyKeyValue(this.splitkey, 0, this.splitkey.length);<a
name="line.112"></a>
+<span class="sourceLineNo">113</span> // Is it top or bottom half?<a
name="line.113"></a>
+<span class="sourceLineNo">114</span> this.top =
Reference.isTopFileRegion(r.getFileRegion());<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> protected boolean isTop() {<a
name="line.117"></a>
+<span class="sourceLineNo">118</span> return this.top;<a
name="line.118"></a>
+<span class="sourceLineNo">119</span> }<a name="line.119"></a>
+<span class="sourceLineNo">120</span><a name="line.120"></a>
+<span class="sourceLineNo">121</span> @Override<a name="line.121"></a>
+<span class="sourceLineNo">122</span> public HFileScanner getScanner(final
boolean cacheBlocks,<a name="line.122"></a>
+<span class="sourceLineNo">123</span> final boolean pread, final boolean
isCompaction) {<a name="line.123"></a>
+<span class="sourceLineNo">124</span> final HFileScanner s =
super.getScanner(cacheBlocks, pread, isCompaction);<a name="line.124"></a>
+<span class="sourceLineNo">125</span> return new HFileScanner() {<a
name="line.125"></a>
+<span class="sourceLineNo">126</span> final HFileScanner delegate = s;<a
name="line.126"></a>
+<span class="sourceLineNo">127</span> public boolean atEnd = false;<a
name="line.127"></a>
+<span class="sourceLineNo">128</span><a name="line.128"></a>
+<span class="sourceLineNo">129</span> public Cell getKey() {<a
name="line.129"></a>
+<span class="sourceLineNo">130</span> if (atEnd) return null;<a
name="line.130"></a>
+<span class="sourceLineNo">131</span> return delegate.getKey();<a
name="line.131"></a>
+<span class="sourceLineNo">132</span> }<a name="line.132"></a>
+<span class="sourceLineNo">133</span><a name="line.133"></a>
+<span class="sourceLineNo">134</span> public String getKeyString() {<a
name="line.134"></a>
+<span class="sourceLineNo">135</span> if (atEnd) return null;<a
name="line.135"></a>
+<span class="sourceLineNo">136</span><a name="line.136"></a>
+<span class="sourceLineNo">137</span> return delegate.getKeyString();<a
name="line.137"></a>
+<span class="sourceLineNo">138</span> }<a name="line.138"></a>
+<span class="sourceLineNo">139</span><a name="line.139"></a>
+<span class="sourceLineNo">140</span> public ByteBuffer getValue() {<a
name="line.140"></a>
+<span class="sourceLineNo">141</span> if (atEnd) return null;<a
name="line.141"></a>
+<span class="sourceLineNo">142</span><a name="line.142"></a>
+<span class="sourceLineNo">143</span> return delegate.getValue();<a
name="line.143"></a>
+<span class="sourceLineNo">144</span> }<a name="line.144"></a>
+<span class="sourceLineNo">145</span><a name="line.145"></a>
+<span class="sourceLineNo">146</span> public String getValueString() {<a
name="line.146"></a>
+<span class="sourceLineNo">147</span> if (atEnd) return null;<a
name="line.147"></a>
+<span class="sourceLineNo">148</span><a name="line.148"></a>
+<span class="sourceLineNo">149</span> return
delegate.getValueString();<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 Cell getCell() {<a
name="line.152"></a>
+<span class="sourceLineNo">153</span> if (atEnd) return null;<a
name="line.153"></a>
+<span class="sourceLineNo">154</span><a name="line.154"></a>
+<span class="sourceLineNo">155</span> return delegate.getCell();<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 boolean next() throws
IOException {<a name="line.158"></a>
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