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Posted to commits@hbase.apache.org by gi...@apache.org on 2018/05/10 14:48:27 UTC
[27/34] hbase-site git commit: Published site at
8ba2a7eeb967a80d04020e30b2fe8e8652ea1758.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/15a025c1/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileIOEngine.FileWriteAccessor.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileIOEngine.FileWriteAccessor.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileIOEngine.FileWriteAccessor.html
index 3647d12..25faf76 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileIOEngine.FileWriteAccessor.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileIOEngine.FileWriteAccessor.html
@@ -34,292 +34,308 @@
<span class="sourceLineNo">026</span>import java.nio.channels.ClosedChannelException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.nio.channels.FileChannel;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Arrays;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.io.hfile.Cacheable;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.30"></a>
-<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.io.hfile.CacheableDeserializer;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.hadoop.util.StringUtils;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.slf4j.Logger;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.slf4j.LoggerFactory;<a name="line.37"></a>
-<span class="sourceLineNo">038</span><a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;<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> * IO engine that stores data to a file on the local file system.<a name="line.43"></a>
-<span class="sourceLineNo">044</span> */<a name="line.44"></a>
-<span class="sourceLineNo">045</span>@InterfaceAudience.Private<a name="line.45"></a>
-<span class="sourceLineNo">046</span>public class FileIOEngine implements IOEngine {<a name="line.46"></a>
-<span class="sourceLineNo">047</span> private static final Logger LOG = LoggerFactory.getLogger(FileIOEngine.class);<a name="line.47"></a>
-<span class="sourceLineNo">048</span> public static final String FILE_DELIMITER = ",";<a name="line.48"></a>
-<span class="sourceLineNo">049</span> private final String[] filePaths;<a name="line.49"></a>
-<span class="sourceLineNo">050</span> private final FileChannel[] fileChannels;<a name="line.50"></a>
-<span class="sourceLineNo">051</span> private final RandomAccessFile[] rafs;<a name="line.51"></a>
-<span class="sourceLineNo">052</span><a name="line.52"></a>
-<span class="sourceLineNo">053</span> private final long sizePerFile;<a name="line.53"></a>
-<span class="sourceLineNo">054</span> private final long capacity;<a name="line.54"></a>
-<span class="sourceLineNo">055</span><a name="line.55"></a>
-<span class="sourceLineNo">056</span> private FileReadAccessor readAccessor = new FileReadAccessor();<a name="line.56"></a>
-<span class="sourceLineNo">057</span> private FileWriteAccessor writeAccessor = new FileWriteAccessor();<a name="line.57"></a>
-<span class="sourceLineNo">058</span><a name="line.58"></a>
-<span class="sourceLineNo">059</span> public FileIOEngine(long capacity, boolean maintainPersistence, String... filePaths)<a name="line.59"></a>
-<span class="sourceLineNo">060</span> throws IOException {<a name="line.60"></a>
-<span class="sourceLineNo">061</span> this.sizePerFile = capacity / filePaths.length;<a name="line.61"></a>
-<span class="sourceLineNo">062</span> this.capacity = this.sizePerFile * filePaths.length;<a name="line.62"></a>
-<span class="sourceLineNo">063</span> this.filePaths = filePaths;<a name="line.63"></a>
-<span class="sourceLineNo">064</span> this.fileChannels = new FileChannel[filePaths.length];<a name="line.64"></a>
-<span class="sourceLineNo">065</span> if (!maintainPersistence) {<a name="line.65"></a>
-<span class="sourceLineNo">066</span> for (String filePath : filePaths) {<a name="line.66"></a>
-<span class="sourceLineNo">067</span> File file = new File(filePath);<a name="line.67"></a>
-<span class="sourceLineNo">068</span> if (file.exists()) {<a name="line.68"></a>
-<span class="sourceLineNo">069</span> if (LOG.isDebugEnabled()) {<a name="line.69"></a>
-<span class="sourceLineNo">070</span> LOG.debug("File " + filePath + " already exists. Deleting!!");<a name="line.70"></a>
-<span class="sourceLineNo">071</span> }<a name="line.71"></a>
-<span class="sourceLineNo">072</span> file.delete();<a name="line.72"></a>
-<span class="sourceLineNo">073</span> // If deletion fails still we can manage with the writes<a name="line.73"></a>
-<span class="sourceLineNo">074</span> }<a name="line.74"></a>
-<span class="sourceLineNo">075</span> }<a name="line.75"></a>
-<span class="sourceLineNo">076</span> }<a name="line.76"></a>
-<span class="sourceLineNo">077</span> this.rafs = new RandomAccessFile[filePaths.length];<a name="line.77"></a>
-<span class="sourceLineNo">078</span> for (int i = 0; i < filePaths.length; i++) {<a name="line.78"></a>
-<span class="sourceLineNo">079</span> String filePath = filePaths[i];<a name="line.79"></a>
-<span class="sourceLineNo">080</span> try {<a name="line.80"></a>
-<span class="sourceLineNo">081</span> rafs[i] = new RandomAccessFile(filePath, "rw");<a name="line.81"></a>
-<span class="sourceLineNo">082</span> long totalSpace = new File(filePath).getTotalSpace();<a name="line.82"></a>
-<span class="sourceLineNo">083</span> if (totalSpace < sizePerFile) {<a name="line.83"></a>
-<span class="sourceLineNo">084</span> // The next setting length will throw exception,logging this message<a name="line.84"></a>
-<span class="sourceLineNo">085</span> // is just used for the detail reason of exception，<a name="line.85"></a>
-<span class="sourceLineNo">086</span> String msg = "Only " + StringUtils.byteDesc(totalSpace)<a name="line.86"></a>
-<span class="sourceLineNo">087</span> + " total space under " + filePath + ", not enough for requested "<a name="line.87"></a>
-<span class="sourceLineNo">088</span> + StringUtils.byteDesc(sizePerFile);<a name="line.88"></a>
-<span class="sourceLineNo">089</span> LOG.warn(msg);<a name="line.89"></a>
-<span class="sourceLineNo">090</span> }<a name="line.90"></a>
-<span class="sourceLineNo">091</span> rafs[i].setLength(sizePerFile);<a name="line.91"></a>
-<span class="sourceLineNo">092</span> fileChannels[i] = rafs[i].getChannel();<a name="line.92"></a>
-<span class="sourceLineNo">093</span> LOG.info("Allocating cache " + StringUtils.byteDesc(sizePerFile)<a name="line.93"></a>
-<span class="sourceLineNo">094</span> + ", on the path:" + filePath);<a name="line.94"></a>
-<span class="sourceLineNo">095</span> } catch (IOException fex) {<a name="line.95"></a>
-<span class="sourceLineNo">096</span> LOG.error("Failed allocating cache on " + filePath, fex);<a name="line.96"></a>
-<span class="sourceLineNo">097</span> shutdown();<a name="line.97"></a>
-<span class="sourceLineNo">098</span> throw fex;<a name="line.98"></a>
-<span class="sourceLineNo">099</span> }<a name="line.99"></a>
-<span class="sourceLineNo">100</span> }<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> @Override<a name="line.103"></a>
-<span class="sourceLineNo">104</span> public String toString() {<a name="line.104"></a>
-<span class="sourceLineNo">105</span> return "ioengine=" + this.getClass().getSimpleName() + ", paths="<a name="line.105"></a>
-<span class="sourceLineNo">106</span> + Arrays.asList(filePaths) + ", capacity=" + String.format("%,d", this.capacity);<a name="line.106"></a>
-<span class="sourceLineNo">107</span> }<a name="line.107"></a>
-<span class="sourceLineNo">108</span><a name="line.108"></a>
-<span class="sourceLineNo">109</span> /**<a name="line.109"></a>
-<span class="sourceLineNo">110</span> * File IO engine is always able to support persistent storage for the cache<a name="line.110"></a>
-<span class="sourceLineNo">111</span> * @return true<a name="line.111"></a>
-<span class="sourceLineNo">112</span> */<a name="line.112"></a>
-<span class="sourceLineNo">113</span> @Override<a name="line.113"></a>
-<span class="sourceLineNo">114</span> public boolean isPersistent() {<a name="line.114"></a>
-<span class="sourceLineNo">115</span> return true;<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> /**<a name="line.118"></a>
-<span class="sourceLineNo">119</span> * Transfers data from file to the given byte buffer<a name="line.119"></a>
-<span class="sourceLineNo">120</span> * @param offset The offset in the file where the first byte to be read<a name="line.120"></a>
-<span class="sourceLineNo">121</span> * @param length The length of buffer that should be allocated for reading<a name="line.121"></a>
-<span class="sourceLineNo">122</span> * from the file channel<a name="line.122"></a>
-<span class="sourceLineNo">123</span> * @return number of bytes read<a name="line.123"></a>
-<span class="sourceLineNo">124</span> * @throws IOException<a name="line.124"></a>
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-<span class="sourceLineNo">126</span> @Override<a name="line.126"></a>
-<span class="sourceLineNo">127</span> public Cacheable read(long offset, int length, CacheableDeserializer<Cacheable> deserializer)<a name="line.127"></a>
-<span class="sourceLineNo">128</span> throws IOException {<a name="line.128"></a>
-<span class="sourceLineNo">129</span> Preconditions.checkArgument(length >= 0, "Length of read can not be less than 0.");<a name="line.129"></a>
-<span class="sourceLineNo">130</span> ByteBuffer dstBuffer = ByteBuffer.allocate(length);<a name="line.130"></a>
-<span class="sourceLineNo">131</span> if (length != 0) {<a name="line.131"></a>
-<span class="sourceLineNo">132</span> accessFile(readAccessor, dstBuffer, offset);<a name="line.132"></a>
-<span class="sourceLineNo">133</span> // The buffer created out of the fileChannel is formed by copying the data from the file<a name="line.133"></a>
-<span class="sourceLineNo">134</span> // Hence in this case there is no shared memory that we point to. Even if the BucketCache evicts<a name="line.134"></a>
-<span class="sourceLineNo">135</span> // this buffer from the file the data is already copied and there is no need to ensure that<a name="line.135"></a>
-<span class="sourceLineNo">136</span> // the results are not corrupted before consuming them.<a name="line.136"></a>
-<span class="sourceLineNo">137</span> if (dstBuffer.limit() != length) {<a name="line.137"></a>
-<span class="sourceLineNo">138</span> throw new RuntimeException("Only " + dstBuffer.limit() + " bytes read, " + length<a name="line.138"></a>
-<span class="sourceLineNo">139</span> + " expected");<a name="line.139"></a>
-<span class="sourceLineNo">140</span> }<a name="line.140"></a>
-<span class="sourceLineNo">141</span> }<a name="line.141"></a>
-<span class="sourceLineNo">142</span> return deserializer.deserialize(new SingleByteBuff(dstBuffer), true, MemoryType.EXCLUSIVE);<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> @VisibleForTesting<a name="line.145"></a>
-<span class="sourceLineNo">146</span> void closeFileChannels() {<a name="line.146"></a>
-<span class="sourceLineNo">147</span> for (FileChannel fileChannel: fileChannels) {<a name="line.147"></a>
-<span class="sourceLineNo">148</span> try {<a name="line.148"></a>
-<span class="sourceLineNo">149</span> fileChannel.close();<a name="line.149"></a>
-<span class="sourceLineNo">150</span> } catch (IOException e) {<a name="line.150"></a>
-<span class="sourceLineNo">151</span> LOG.warn("Failed to close FileChannel", e);<a name="line.151"></a>
-<span class="sourceLineNo">152</span> }<a name="line.152"></a>
-<span class="sourceLineNo">153</span> }<a name="line.153"></a>
-<span class="sourceLineNo">154</span> }<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> * Transfers data from the given byte buffer to file<a name="line.157"></a>
-<span class="sourceLineNo">158</span> * @param srcBuffer the given byte buffer from which bytes are to be read<a name="line.158"></a>
-<span class="sourceLineNo">159</span> * @param offset The offset in the file where the first byte to be written<a name="line.159"></a>
-<span class="sourceLineNo">160</span> * @throws IOException<a name="line.160"></a>
-<span class="sourceLineNo">161</span> */<a name="line.161"></a>
-<span class="sourceLineNo">162</span> @Override<a name="line.162"></a>
-<span class="sourceLineNo">163</span> public void write(ByteBuffer srcBuffer, long offset) throws IOException {<a name="line.163"></a>
-<span class="sourceLineNo">164</span> if (!srcBuffer.hasRemaining()) {<a name="line.164"></a>
-<span class="sourceLineNo">165</span> return;<a name="line.165"></a>
-<span class="sourceLineNo">166</span> }<a name="line.166"></a>
-<span class="sourceLineNo">167</span> accessFile(writeAccessor, srcBuffer, offset);<a name="line.167"></a>
-<span class="sourceLineNo">168</span> }<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> * Sync the data to file after writing<a name="line.171"></a>
-<span class="sourceLineNo">172</span> * @throws IOException<a name="line.172"></a>
-<span class="sourceLineNo">173</span> */<a name="line.173"></a>
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-<span class="sourceLineNo">177</span> try {<a name="line.177"></a>
-<span class="sourceLineNo">178</span> if (fileChannels[i] != null) {<a name="line.178"></a>
-<span class="sourceLineNo">179</span> fileChannels[i].force(true);<a name="line.179"></a>
-<span class="sourceLineNo">180</span> }<a name="line.180"></a>
-<span class="sourceLineNo">181</span> } catch (IOException ie) {<a name="line.181"></a>
-<span class="sourceLineNo">182</span> LOG.warn("Failed syncing data to " + this.filePaths[i]);<a name="line.182"></a>
-<span class="sourceLineNo">183</span> throw ie;<a name="line.183"></a>
-<span class="sourceLineNo">184</span> }<a name="line.184"></a>
-<span class="sourceLineNo">185</span> }<a name="line.185"></a>
-<span class="sourceLineNo">186</span> }<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> * Close the file<a name="line.189"></a>
-<span class="sourceLineNo">190</span> */<a name="line.190"></a>
-<span class="sourceLineNo">191</span> @Override<a name="line.191"></a>
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-<span class="sourceLineNo">194</span> try {<a name="line.194"></a>
-<span class="sourceLineNo">195</span> if (fileChannels[i] != null) {<a name="line.195"></a>
-<span class="sourceLineNo">196</span> fileChannels[i].close();<a name="line.196"></a>
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-<span class="sourceLineNo">199</span> rafs[i].close();<a name="line.199"></a>
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-<span class="sourceLineNo">202</span> LOG.error("Failed closing " + filePaths[i] + " when shudown the IOEngine", ex);<a name="line.202"></a>
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-<span class="sourceLineNo">204</span> }<a name="line.204"></a>
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-<span class="sourceLineNo">209</span> // When caching block into BucketCache there will be single buffer backing for this HFileBlock.<a name="line.209"></a>
-<span class="sourceLineNo">210</span> assert srcBuffer.hasArray();<a name="line.210"></a>
-<span class="sourceLineNo">211</span> write(ByteBuffer.wrap(srcBuffer.array(), srcBuffer.arrayOffset(),<a name="line.211"></a>
-<span class="sourceLineNo">212</span> srcBuffer.remaining()), offset);<a name="line.212"></a>
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-<span class="sourceLineNo">217</span> int startFileNum = getFileNum(globalOffset);<a name="line.217"></a>
-<span class="sourceLineNo">218</span> int remainingAccessDataLen = buffer.remaining();<a name="line.218"></a>
-<span class="sourceLineNo">219</span> int endFileNum = getFileNum(globalOffset + remainingAccessDataLen - 1);<a name="line.219"></a>
-<span class="sourceLineNo">220</span> int accessFileNum = startFileNum;<a name="line.220"></a>
-<span class="sourceLineNo">221</span> long accessOffset = getAbsoluteOffsetInFile(accessFileNum, globalOffset);<a name="line.221"></a>
-<span class="sourceLineNo">222</span> int bufLimit = buffer.limit();<a name="line.222"></a>
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-<span class="sourceLineNo">224</span> FileChannel fileChannel = fileChannels[accessFileNum];<a name="line.224"></a>
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-<span class="sourceLineNo">226</span> if (endFileNum > accessFileNum) {<a name="line.226"></a>
-<span class="sourceLineNo">227</span> // short the limit;<a name="line.227"></a>
-<span class="sourceLineNo">228</span> buffer.limit((int) (buffer.limit() - remainingAccessDataLen<a name="line.228"></a>
-<span class="sourceLineNo">229</span> + sizePerFile - accessOffset));<a name="line.229"></a>
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-<span class="sourceLineNo">251</span> + " exceed the engine's capacity " + StringUtils.byteDesc(capacity) + " where offset="<a name="line.251"></a>
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-<span class="sourceLineNo">256</span><a name="line.256"></a>
-<span class="sourceLineNo">257</span> /**<a name="line.257"></a>
-<span class="sourceLineNo">258</span> * Get the absolute offset in given file with the relative global offset.<a name="line.258"></a>
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-<span class="sourceLineNo">261</span> * @return the absolute offset<a name="line.261"></a>
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-<span class="sourceLineNo">273</span> throw new RuntimeException("Not expected offset " + offset<a name="line.273"></a>
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-<span class="sourceLineNo">312</span> }<a name="line.312"></a>
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+<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.io.hfile.Cacheable;<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.io.hfile.CacheableDeserializer;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import org.apache.hadoop.util.StringUtils;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.36"></a>
+<span class="sourceLineNo">037</span>import org.slf4j.Logger;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import org.slf4j.LoggerFactory;<a name="line.38"></a>
+<span class="sourceLineNo">039</span><a name="line.39"></a>
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+<span class="sourceLineNo">041</span>import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;<a name="line.41"></a>
+<span class="sourceLineNo">042</span><a name="line.42"></a>
+<span class="sourceLineNo">043</span>/**<a name="line.43"></a>
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+<span class="sourceLineNo">046</span>@InterfaceAudience.Private<a name="line.46"></a>
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+<span class="sourceLineNo">059</span> private FileWriteAccessor writeAccessor = new FileWriteAccessor();<a name="line.59"></a>
+<span class="sourceLineNo">060</span><a name="line.60"></a>
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+<span class="sourceLineNo">064</span> this.capacity = this.sizePerFile * filePaths.length;<a name="line.64"></a>
+<span class="sourceLineNo">065</span> this.filePaths = filePaths;<a name="line.65"></a>
+<span class="sourceLineNo">066</span> this.fileChannels = new FileChannel[filePaths.length];<a name="line.66"></a>
+<span class="sourceLineNo">067</span> if (!maintainPersistence) {<a name="line.67"></a>
+<span class="sourceLineNo">068</span> for (String filePath : filePaths) {<a name="line.68"></a>
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+<span class="sourceLineNo">070</span> if (file.exists()) {<a name="line.70"></a>
+<span class="sourceLineNo">071</span> if (LOG.isDebugEnabled()) {<a name="line.71"></a>
+<span class="sourceLineNo">072</span> LOG.debug("File " + filePath + " already exists. Deleting!!");<a name="line.72"></a>
+<span class="sourceLineNo">073</span> }<a name="line.73"></a>
+<span class="sourceLineNo">074</span> file.delete();<a name="line.74"></a>
+<span class="sourceLineNo">075</span> // If deletion fails still we can manage with the writes<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.rafs = new RandomAccessFile[filePaths.length];<a name="line.79"></a>
+<span class="sourceLineNo">080</span> this.channelLocks = new ReentrantLock[filePaths.length];<a name="line.80"></a>
+<span class="sourceLineNo">081</span> for (int i = 0; i < filePaths.length; i++) {<a name="line.81"></a>
+<span class="sourceLineNo">082</span> String filePath = filePaths[i];<a name="line.82"></a>
+<span class="sourceLineNo">083</span> try {<a name="line.83"></a>
+<span class="sourceLineNo">084</span> rafs[i] = new RandomAccessFile(filePath, "rw");<a name="line.84"></a>
+<span class="sourceLineNo">085</span> long totalSpace = new File(filePath).getTotalSpace();<a name="line.85"></a>
+<span class="sourceLineNo">086</span> if (totalSpace < sizePerFile) {<a name="line.86"></a>
+<span class="sourceLineNo">087</span> // The next setting length will throw exception,logging this message<a name="line.87"></a>
+<span class="sourceLineNo">088</span> // is just used for the detail reason of exception，<a name="line.88"></a>
+<span class="sourceLineNo">089</span> String msg = "Only " + StringUtils.byteDesc(totalSpace)<a name="line.89"></a>
+<span class="sourceLineNo">090</span> + " total space under " + filePath + ", not enough for requested "<a name="line.90"></a>
+<span class="sourceLineNo">091</span> + StringUtils.byteDesc(sizePerFile);<a name="line.91"></a>
+<span class="sourceLineNo">092</span> LOG.warn(msg);<a name="line.92"></a>
+<span class="sourceLineNo">093</span> }<a name="line.93"></a>
+<span class="sourceLineNo">094</span> rafs[i].setLength(sizePerFile);<a name="line.94"></a>
+<span class="sourceLineNo">095</span> fileChannels[i] = rafs[i].getChannel();<a name="line.95"></a>
+<span class="sourceLineNo">096</span> channelLocks[i] = new ReentrantLock();<a name="line.96"></a>
+<span class="sourceLineNo">097</span> LOG.info("Allocating cache " + StringUtils.byteDesc(sizePerFile)<a name="line.97"></a>
+<span class="sourceLineNo">098</span> + ", on the path:" + filePath);<a name="line.98"></a>
+<span class="sourceLineNo">099</span> } catch (IOException fex) {<a name="line.99"></a>
+<span class="sourceLineNo">100</span> LOG.error("Failed allocating cache on " + filePath, fex);<a name="line.100"></a>
+<span class="sourceLineNo">101</span> shutdown();<a name="line.101"></a>
+<span class="sourceLineNo">102</span> throw fex;<a name="line.102"></a>
+<span class="sourceLineNo">103</span> }<a name="line.103"></a>
+<span class="sourceLineNo">104</span> }<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> @Override<a name="line.107"></a>
+<span class="sourceLineNo">108</span> public String toString() {<a name="line.108"></a>
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+<span class="sourceLineNo">110</span> + Arrays.asList(filePaths) + ", capacity=" + String.format("%,d", this.capacity);<a name="line.110"></a>
+<span class="sourceLineNo">111</span> }<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> * File IO engine is always able to support persistent storage for the cache<a name="line.114"></a>
+<span class="sourceLineNo">115</span> * @return true<a name="line.115"></a>
+<span class="sourceLineNo">116</span> */<a name="line.116"></a>
+<span class="sourceLineNo">117</span> @Override<a name="line.117"></a>
+<span class="sourceLineNo">118</span> public boolean isPersistent() {<a name="line.118"></a>
+<span class="sourceLineNo">119</span> return true;<a name="line.119"></a>
+<span class="sourceLineNo">120</span> }<a name="line.120"></a>
+<span class="sourceLineNo">121</span><a name="line.121"></a>
+<span class="sourceLineNo">122</span> /**<a name="line.122"></a>
+<span class="sourceLineNo">123</span> * Transfers data from file to the given byte buffer<a name="line.123"></a>
+<span class="sourceLineNo">124</span> * @param offset The offset in the file where the first byte to be read<a name="line.124"></a>
+<span class="sourceLineNo">125</span> * @param length The length of buffer that should be allocated for reading<a name="line.125"></a>
+<span class="sourceLineNo">126</span> * from the file channel<a name="line.126"></a>
+<span class="sourceLineNo">127</span> * @return number of bytes read<a name="line.127"></a>
+<span class="sourceLineNo">128</span> * @throws IOException<a name="line.128"></a>
+<span class="sourceLineNo">129</span> */<a name="line.129"></a>
+<span class="sourceLineNo">130</span> @Override<a name="line.130"></a>
+<span class="sourceLineNo">131</span> public Cacheable read(long offset, int length, CacheableDeserializer<Cacheable> deserializer)<a name="line.131"></a>
+<span class="sourceLineNo">132</span> throws IOException {<a name="line.132"></a>
+<span class="sourceLineNo">133</span> Preconditions.checkArgument(length >= 0, "Length of read can not be less than 0.");<a name="line.133"></a>
+<span class="sourceLineNo">134</span> ByteBuffer dstBuffer = ByteBuffer.allocate(length);<a name="line.134"></a>
+<span class="sourceLineNo">135</span> if (length != 0) {<a name="line.135"></a>
+<span class="sourceLineNo">136</span> accessFile(readAccessor, dstBuffer, offset);<a name="line.136"></a>
+<span class="sourceLineNo">137</span> // The buffer created out of the fileChannel is formed by copying the data from the file<a name="line.137"></a>
+<span class="sourceLineNo">138</span> // Hence in this case there is no shared memory that we point to. Even if the BucketCache evicts<a name="line.138"></a>
+<span class="sourceLineNo">139</span> // this buffer from the file the data is already copied and there is no need to ensure that<a name="line.139"></a>
+<span class="sourceLineNo">140</span> // the results are not corrupted before consuming them.<a name="line.140"></a>
+<span class="sourceLineNo">141</span> if (dstBuffer.limit() != length) {<a name="line.141"></a>
+<span class="sourceLineNo">142</span> throw new RuntimeException("Only " + dstBuffer.limit() + " bytes read, " + length<a name="line.142"></a>
+<span class="sourceLineNo">143</span> + " expected");<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>
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+<span class="sourceLineNo">147</span> }<a name="line.147"></a>
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+<span class="sourceLineNo">149</span> @VisibleForTesting<a name="line.149"></a>
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+<span class="sourceLineNo">151</span> for (FileChannel fileChannel: fileChannels) {<a name="line.151"></a>
+<span class="sourceLineNo">152</span> try {<a name="line.152"></a>
+<span class="sourceLineNo">153</span> fileChannel.close();<a name="line.153"></a>
+<span class="sourceLineNo">154</span> } catch (IOException e) {<a name="line.154"></a>
+<span class="sourceLineNo">155</span> LOG.warn("Failed to close FileChannel", e);<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> }<a name="line.158"></a>
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+<span class="sourceLineNo">160</span> /**<a name="line.160"></a>
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+<span class="sourceLineNo">164</span> * @throws IOException<a name="line.164"></a>
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+<span class="sourceLineNo">173</span><a name="line.173"></a>
+<span class="sourceLineNo">174</span> /**<a name="line.174"></a>
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+<span class="sourceLineNo">176</span> * @throws IOException<a name="line.176"></a>
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+<span class="sourceLineNo">178</span> @Override<a name="line.178"></a>
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+<span class="sourceLineNo">181</span> try {<a name="line.181"></a>
+<span class="sourceLineNo">182</span> if (fileChannels[i] != null) {<a name="line.182"></a>
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+<span class="sourceLineNo">185</span> } catch (IOException ie) {<a name="line.185"></a>
+<span class="sourceLineNo">186</span> LOG.warn("Failed syncing data to " + this.filePaths[i]);<a name="line.186"></a>
+<span class="sourceLineNo">187</span> throw ie;<a name="line.187"></a>
+<span class="sourceLineNo">188</span> }<a name="line.188"></a>
+<span class="sourceLineNo">189</span> }<a name="line.189"></a>
+<span class="sourceLineNo">190</span> }<a name="line.190"></a>
+<span class="sourceLineNo">191</span><a name="line.191"></a>
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+<span class="sourceLineNo">195</span> @Override<a name="line.195"></a>
+<span class="sourceLineNo">196</span> public void shutdown() {<a name="line.196"></a>
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+<span class="sourceLineNo">198</span> try {<a name="line.198"></a>
+<span class="sourceLineNo">199</span> if (fileChannels[i] != null) {<a name="line.199"></a>
+<span class="sourceLineNo">200</span> fileChannels[i].close();<a name="line.200"></a>
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+<span class="sourceLineNo">202</span> if (rafs[i] != null) {<a name="line.202"></a>
+<span class="sourceLineNo">203</span> rafs[i].close();<a name="line.203"></a>
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+<span class="sourceLineNo">205</span> } catch (IOException ex) {<a name="line.205"></a>
+<span class="sourceLineNo">206</span> LOG.error("Failed closing " + filePaths[i] + " when shudown the IOEngine", ex);<a name="line.206"></a>
+<span class="sourceLineNo">207</span> }<a name="line.207"></a>
+<span class="sourceLineNo">208</span> }<a name="line.208"></a>
+<span class="sourceLineNo">209</span> }<a name="line.209"></a>
+<span class="sourceLineNo">210</span><a name="line.210"></a>
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+<span class="sourceLineNo">212</span> public void write(ByteBuff srcBuffer, long offset) throws IOException {<a name="line.212"></a>
+<span class="sourceLineNo">213</span> // When caching block into BucketCache there will be single buffer backing for this HFileBlock.<a name="line.213"></a>
+<span class="sourceLineNo">214</span> assert srcBuffer.hasArray();<a name="line.214"></a>
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+<span class="sourceLineNo">216</span> srcBuffer.remaining()), offset);<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>
+<span class="sourceLineNo">219</span> private void accessFile(FileAccessor accessor, ByteBuffer buffer,<a name="line.219"></a>
+<span class="sourceLineNo">220</span> long globalOffset) throws IOException {<a name="line.220"></a>
+<span class="sourceLineNo">221</span> int startFileNum = getFileNum(globalOffset);<a name="line.221"></a>
+<span class="sourceLineNo">222</span> int remainingAccessDataLen = buffer.remaining();<a name="line.222"></a>
+<span class="sourceLineNo">223</span> int endFileNum = getFileNum(globalOffset + remainingAccessDataLen - 1);<a name="line.223"></a>
+<span class="sourceLineNo">224</span> int accessFileNum = startFileNum;<a name="line.224"></a>
+<span class="sourceLineNo">225</span> long accessOffset = getAbsoluteOffsetInFile(accessFileNum, globalOffset);<a name="line.225"></a>
+<span class="sourceLineNo">226</span> int bufLimit = buffer.limit();<a name="line.226"></a>
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+<span class="sourceLineNo">243</span> // recover the limit<a name="line.243"></a>
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+<span class="sourceLineNo">260</span> /**<a name="line.260"></a>
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+<span class="sourceLineNo">269</span><a name="line.269"></a>
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+<span class="sourceLineNo">276</span> throw new RuntimeException("Not expected offset " + offset<a name="line.276"></a>
+<span class="sourceLineNo">277</span> + " where capacity=" + capacity);<a name="line.277"></a>
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+<span class="sourceLineNo">281</span><a name="line.281"></a>
+<span class="sourceLineNo">282</span> @VisibleForTesting<a name="line.282"></a>
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+<span class="sourceLineNo">286</span><a name="line.286"></a>
+<span class="sourceLineNo">287</span> @VisibleForTesting<a name="line.287"></a>
+<span class="sourceLineNo">288</span> void refreshFileConnection(int accessFileNum, IOException ioe) throws IOException {<a name="line.288"></a>
+<span class="sourceLineNo">289</span> ReentrantLock channelLock = channelLocks[accessFileNum];<a name="line.289"></a>
+<span class="sourceLineNo">290</span> channelLock.lock();<a name="line.290"></a>
+<span class="sourceLineNo">291</span> try {<a name="line.291"></a>
+<span class="sourceLineNo">292</span> FileChannel fileChannel = fileChannels[accessFileNum];<a name="line.292"></a>
+<span class="sourceLineNo">293</span> if (fileChannel != null) {<a name="line.293"></a>
+<span class="sourceLineNo">294</span> // Don't re-open a channel if we were waiting on another<a name="line.294"></a>
+<span class="sourceLineNo">295</span> // thread to re-open the channel and it is now open.<a name="line.295"></a>
+<span class="sourceLineNo">296</span> if (fileChannel.isOpen()) {<a name="line.296"></a>
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+<span class="sourceLineNo">299</span> fileChannel.close();<a name="line.299"></a>
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+<span class="sourceLineNo">302</span> + filePaths[accessFileNum], ioe);<a name="line.302"></a>
+<span class="sourceLineNo">303</span> rafs[accessFileNum] = new RandomAccessFile(filePaths[accessFileNum], "rw");<a name="line.303"></a>
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+<span class="sourceLineNo">308</span> }<a name="line.308"></a>
+<span class="sourceLineNo">309</span><a name="line.309"></a>
+<span class="sourceLineNo">310</span> private static interface FileAccessor {<a name="line.310"></a>
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+<span class="sourceLineNo">314</span><a name="line.314"></a>
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+<span class="sourceLineNo">321</span> }<a name="line.321"></a>
+<span class="sourceLineNo">322</span><a name="line.322"></a>
+<span class="sourceLineNo">323</span> private static class FileWriteAccessor implements FileAccessor {<a name="line.323"></a>
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+<span class="sourceLineNo">329</span> }<a name="line.329"></a>
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