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From mi...@apache.org
Subject [04/51] [partial] hbase-site git commit: Published site at 7dabcf23e8dd53f563981e1e03f82336fc0a44da.
Date Fri, 04 Mar 2016 17:50:48 GMT
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/3e48e84d/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html
index 9a60dce..fcaf416 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html
@@ -34,1938 +34,1994 @@
 <span class="sourceLineNo">026</span>import java.util.concurrent.locks.Lock;<a name="line.26"></a>
 <span class="sourceLineNo">027</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.27"></a>
 <span class="sourceLineNo">028</span><a name="line.28"></a>
-<span class="sourceLineNo">029</span>import org.apache.hadoop.fs.FSDataInputStream;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import org.apache.hadoop.fs.FSDataOutputStream;<a name="line.30"></a>
-<span class="sourceLineNo">031</span>import org.apache.hadoop.fs.Path;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.Cell;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.HConstants;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.fs.HFileSystem;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.io.FSDataInputStreamWrapper;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.io.ByteArrayOutputStream;<a name="line.37"></a>
-<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.io.ByteBuffInputStream;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.io.ByteBufferSupportDataOutputStream;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.io.encoding.HFileBlockDecodingContext;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultDecodingContext;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultEncodingContext;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.io.encoding.HFileBlockEncodingContext;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.nio.MultiByteBuff;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.util.ChecksumType;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import org.apache.hadoop.io.IOUtils;<a name="line.51"></a>
-<span class="sourceLineNo">052</span><a name="line.52"></a>
-<span class="sourceLineNo">053</span>import com.google.common.annotations.VisibleForTesting;<a name="line.53"></a>
-<span class="sourceLineNo">054</span>import com.google.common.base.Preconditions;<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> * Reading {@link HFile} version 1 and 2 blocks, and writing version 2 blocks.<a name="line.57"></a>
-<span class="sourceLineNo">058</span> * &lt;ul&gt;<a name="line.58"></a>
-<span class="sourceLineNo">059</span> * &lt;li&gt;In version 1 all blocks are always compressed or uncompressed, as<a name="line.59"></a>
-<span class="sourceLineNo">060</span> * specified by the {@link HFile}'s compression algorithm, with a type-specific<a name="line.60"></a>
-<span class="sourceLineNo">061</span> * magic record stored in the beginning of the compressed data (i.e. one needs<a name="line.61"></a>
-<span class="sourceLineNo">062</span> * to uncompress the compressed block to determine the block type). There is<a name="line.62"></a>
-<span class="sourceLineNo">063</span> * only a single compression algorithm setting for all blocks. Offset and size<a name="line.63"></a>
-<span class="sourceLineNo">064</span> * information from the block index are required to read a block.<a name="line.64"></a>
-<span class="sourceLineNo">065</span> * &lt;li&gt;In version 2 a block is structured as follows:<a name="line.65"></a>
-<span class="sourceLineNo">066</span> * &lt;ul&gt;<a name="line.66"></a>
-<span class="sourceLineNo">067</span> * &lt;li&gt;header (see Writer#finishBlock())<a name="line.67"></a>
-<span class="sourceLineNo">068</span> * &lt;ul&gt;<a name="line.68"></a>
-<span class="sourceLineNo">069</span> * &lt;li&gt;Magic record identifying the block type (8 bytes)<a name="line.69"></a>
-<span class="sourceLineNo">070</span> * &lt;li&gt;Compressed block size, excluding header, including checksum (4 bytes)<a name="line.70"></a>
-<span class="sourceLineNo">071</span> * &lt;li&gt;Uncompressed block size, excluding header, excluding checksum (4 bytes)<a name="line.71"></a>
-<span class="sourceLineNo">072</span> * &lt;li&gt;The offset of the previous block of the same type (8 bytes). This is<a name="line.72"></a>
-<span class="sourceLineNo">073</span> * used to be able to navigate to the previous block without going to the block<a name="line.73"></a>
-<span class="sourceLineNo">074</span> * &lt;li&gt;For minorVersions &amp;gt;=1, the ordinal describing checksum type (1 byte)<a name="line.74"></a>
-<span class="sourceLineNo">075</span> * &lt;li&gt;For minorVersions &amp;gt;=1, the number of data bytes/checksum chunk (4 bytes)<a name="line.75"></a>
-<span class="sourceLineNo">076</span> * &lt;li&gt;For minorVersions &amp;gt;=1, the size of data on disk, including header,<a name="line.76"></a>
-<span class="sourceLineNo">077</span> * excluding checksums (4 bytes)<a name="line.77"></a>
-<span class="sourceLineNo">078</span> * &lt;/ul&gt;<a name="line.78"></a>
-<span class="sourceLineNo">079</span> * &lt;/li&gt;<a name="line.79"></a>
-<span class="sourceLineNo">080</span> * &lt;li&gt;Raw/Compressed/Encrypted/Encoded data. The compression algorithm is the<a name="line.80"></a>
-<span class="sourceLineNo">081</span> * same for all the blocks in the {@link HFile}, similarly to what was done in<a name="line.81"></a>
-<span class="sourceLineNo">082</span> * version 1.<a name="line.82"></a>
-<span class="sourceLineNo">083</span> * &lt;li&gt;For minorVersions &amp;gt;=1, a series of 4 byte checksums, one each for<a name="line.83"></a>
-<span class="sourceLineNo">084</span> * the number of bytes specified by bytesPerChecksum.<a name="line.84"></a>
-<span class="sourceLineNo">085</span> * &lt;/ul&gt;<a name="line.85"></a>
-<span class="sourceLineNo">086</span> * &lt;/ul&gt;<a name="line.86"></a>
-<span class="sourceLineNo">087</span> */<a name="line.87"></a>
-<span class="sourceLineNo">088</span>@InterfaceAudience.Private<a name="line.88"></a>
-<span class="sourceLineNo">089</span>public class HFileBlock implements Cacheable {<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>   * On a checksum failure on a Reader, these many suceeding read<a name="line.92"></a>
-<span class="sourceLineNo">093</span>   * requests switch back to using hdfs checksums before auto-reenabling<a name="line.93"></a>
-<span class="sourceLineNo">094</span>   * hbase checksum verification.<a name="line.94"></a>
-<span class="sourceLineNo">095</span>   */<a name="line.95"></a>
-<span class="sourceLineNo">096</span>  static final int CHECKSUM_VERIFICATION_NUM_IO_THRESHOLD = 3;<a name="line.96"></a>
-<span class="sourceLineNo">097</span><a name="line.97"></a>
-<span class="sourceLineNo">098</span>  public static final boolean FILL_HEADER = true;<a name="line.98"></a>
-<span class="sourceLineNo">099</span>  public static final boolean DONT_FILL_HEADER = false;<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>   * The size of block header when blockType is {@link BlockType#ENCODED_DATA}.<a name="line.102"></a>
-<span class="sourceLineNo">103</span>   * This extends normal header by adding the id of encoder.<a name="line.103"></a>
-<span class="sourceLineNo">104</span>   */<a name="line.104"></a>
-<span class="sourceLineNo">105</span>  public static final int ENCODED_HEADER_SIZE = HConstants.HFILEBLOCK_HEADER_SIZE<a name="line.105"></a>
-<span class="sourceLineNo">106</span>      + DataBlockEncoding.ID_SIZE;<a name="line.106"></a>
-<span class="sourceLineNo">107</span><a name="line.107"></a>
-<span class="sourceLineNo">108</span>  static final byte[] DUMMY_HEADER_NO_CHECKSUM =<a name="line.108"></a>
-<span class="sourceLineNo">109</span>     new byte[HConstants.HFILEBLOCK_HEADER_SIZE_NO_CHECKSUM];<a name="line.109"></a>
-<span class="sourceLineNo">110</span><a name="line.110"></a>
-<span class="sourceLineNo">111</span>  // How to get the estimate correctly? if it is a singleBB?<a name="line.111"></a>
-<span class="sourceLineNo">112</span>  public static final int MULTI_BYTE_BUFFER_HEAP_SIZE =<a name="line.112"></a>
-<span class="sourceLineNo">113</span>      (int)ClassSize.estimateBase(MultiByteBuff.class, false);<a name="line.113"></a>
-<span class="sourceLineNo">114</span><a name="line.114"></a>
-<span class="sourceLineNo">115</span>  // meta.usesHBaseChecksum+offset+nextBlockOnDiskSizeWithHeader<a name="line.115"></a>
-<span class="sourceLineNo">116</span>  public static final int EXTRA_SERIALIZATION_SPACE = Bytes.SIZEOF_BYTE + Bytes.SIZEOF_INT<a name="line.116"></a>
-<span class="sourceLineNo">117</span>      + Bytes.SIZEOF_LONG;<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>   * Each checksum value is an integer that can be stored in 4 bytes.<a name="line.120"></a>
-<span class="sourceLineNo">121</span>   */<a name="line.121"></a>
-<span class="sourceLineNo">122</span>  static final int CHECKSUM_SIZE = Bytes.SIZEOF_INT;<a name="line.122"></a>
-<span class="sourceLineNo">123</span><a name="line.123"></a>
-<span class="sourceLineNo">124</span>  static final CacheableDeserializer&lt;Cacheable&gt; blockDeserializer =<a name="line.124"></a>
-<span class="sourceLineNo">125</span>      new CacheableDeserializer&lt;Cacheable&gt;() {<a name="line.125"></a>
-<span class="sourceLineNo">126</span>        public HFileBlock deserialize(ByteBuff buf, boolean reuse, MemoryType memType)<a name="line.126"></a>
-<span class="sourceLineNo">127</span>            throws IOException {<a name="line.127"></a>
-<span class="sourceLineNo">128</span>          buf.limit(buf.limit() - HFileBlock.EXTRA_SERIALIZATION_SPACE).rewind();<a name="line.128"></a>
-<span class="sourceLineNo">129</span>          ByteBuff newByteBuffer;<a name="line.129"></a>
-<span class="sourceLineNo">130</span>          if (reuse) {<a name="line.130"></a>
-<span class="sourceLineNo">131</span>            newByteBuffer = buf.slice();<a name="line.131"></a>
-<span class="sourceLineNo">132</span>          } else {<a name="line.132"></a>
-<span class="sourceLineNo">133</span>            // Used only in tests<a name="line.133"></a>
-<span class="sourceLineNo">134</span>            int len = buf.limit();<a name="line.134"></a>
-<span class="sourceLineNo">135</span>            newByteBuffer = new SingleByteBuff(ByteBuffer.allocate(len));<a name="line.135"></a>
-<span class="sourceLineNo">136</span>            newByteBuffer.put(0, buf, buf.position(), len);<a name="line.136"></a>
-<span class="sourceLineNo">137</span>          }<a name="line.137"></a>
-<span class="sourceLineNo">138</span>          buf.position(buf.limit());<a name="line.138"></a>
-<span class="sourceLineNo">139</span>          buf.limit(buf.limit() + HFileBlock.EXTRA_SERIALIZATION_SPACE);<a name="line.139"></a>
-<span class="sourceLineNo">140</span>          boolean usesChecksum = buf.get() == (byte)1;<a name="line.140"></a>
-<span class="sourceLineNo">141</span>          HFileBlock hFileBlock = new HFileBlock(newByteBuffer, usesChecksum, memType);<a name="line.141"></a>
-<span class="sourceLineNo">142</span>          hFileBlock.offset = buf.getLong();<a name="line.142"></a>
-<span class="sourceLineNo">143</span>          hFileBlock.nextBlockOnDiskSizeWithHeader = buf.getInt();<a name="line.143"></a>
-<span class="sourceLineNo">144</span>          if (hFileBlock.hasNextBlockHeader()) {<a name="line.144"></a>
-<span class="sourceLineNo">145</span>            hFileBlock.buf.limit(hFileBlock.buf.limit() - hFileBlock.headerSize());<a name="line.145"></a>
-<span class="sourceLineNo">146</span>          }<a name="line.146"></a>
-<span class="sourceLineNo">147</span>          return hFileBlock;<a name="line.147"></a>
-<span class="sourceLineNo">148</span>        }<a name="line.148"></a>
-<span class="sourceLineNo">149</span><a name="line.149"></a>
-<span class="sourceLineNo">150</span>        @Override<a name="line.150"></a>
-<span class="sourceLineNo">151</span>        public int getDeserialiserIdentifier() {<a name="line.151"></a>
-<span class="sourceLineNo">152</span>          return deserializerIdentifier;<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>        @Override<a name="line.155"></a>
-<span class="sourceLineNo">156</span>        public HFileBlock deserialize(ByteBuff b) throws IOException {<a name="line.156"></a>
-<span class="sourceLineNo">157</span>          // Used only in tests<a name="line.157"></a>
-<span class="sourceLineNo">158</span>          return deserialize(b, false, MemoryType.EXCLUSIVE);<a name="line.158"></a>
-<span class="sourceLineNo">159</span>        }<a name="line.159"></a>
-<span class="sourceLineNo">160</span>      };<a name="line.160"></a>
-<span class="sourceLineNo">161</span>  private static final int deserializerIdentifier;<a name="line.161"></a>
-<span class="sourceLineNo">162</span>  static {<a name="line.162"></a>
-<span class="sourceLineNo">163</span>    deserializerIdentifier = CacheableDeserializerIdManager<a name="line.163"></a>
-<span class="sourceLineNo">164</span>        .registerDeserializer(blockDeserializer);<a name="line.164"></a>
-<span class="sourceLineNo">165</span>  }<a name="line.165"></a>
-<span class="sourceLineNo">166</span><a name="line.166"></a>
-<span class="sourceLineNo">167</span>  /** Type of block. Header field 0. */<a name="line.167"></a>
-<span class="sourceLineNo">168</span>  private BlockType blockType;<a name="line.168"></a>
-<span class="sourceLineNo">169</span><a name="line.169"></a>
-<span class="sourceLineNo">170</span>  /** Size on disk excluding header, including checksum. Header field 1. */<a name="line.170"></a>
-<span class="sourceLineNo">171</span>  private int onDiskSizeWithoutHeader;<a name="line.171"></a>
-<span class="sourceLineNo">172</span><a name="line.172"></a>
-<span class="sourceLineNo">173</span>  /** Size of pure data. Does not include header or checksums. Header field 2. */<a name="line.173"></a>
-<span class="sourceLineNo">174</span>  private final int uncompressedSizeWithoutHeader;<a name="line.174"></a>
-<span class="sourceLineNo">175</span><a name="line.175"></a>
-<span class="sourceLineNo">176</span>  /** The offset of the previous block on disk. Header field 3. */<a name="line.176"></a>
-<span class="sourceLineNo">177</span>  private final long prevBlockOffset;<a name="line.177"></a>
-<span class="sourceLineNo">178</span><a name="line.178"></a>
-<span class="sourceLineNo">179</span>  /**<a name="line.179"></a>
-<span class="sourceLineNo">180</span>   * Size on disk of header + data. Excludes checksum. Header field 6,<a name="line.180"></a>
-<span class="sourceLineNo">181</span>   * OR calculated from {@link #onDiskSizeWithoutHeader} when using HDFS checksum.<a name="line.181"></a>
-<span class="sourceLineNo">182</span>   */<a name="line.182"></a>
-<span class="sourceLineNo">183</span>  private final int onDiskDataSizeWithHeader;<a name="line.183"></a>
-<span class="sourceLineNo">184</span><a name="line.184"></a>
-<span class="sourceLineNo">185</span>  /** The in-memory representation of the hfile block */<a name="line.185"></a>
-<span class="sourceLineNo">186</span>  private ByteBuff buf;<a name="line.186"></a>
-<span class="sourceLineNo">187</span><a name="line.187"></a>
-<span class="sourceLineNo">188</span>  /** Meta data that holds meta information on the hfileblock */<a name="line.188"></a>
-<span class="sourceLineNo">189</span>  private HFileContext fileContext;<a name="line.189"></a>
+<span class="sourceLineNo">029</span>import org.apache.commons.logging.Log;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import org.apache.commons.logging.LogFactory;<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import org.apache.hadoop.fs.FSDataInputStream;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import org.apache.hadoop.fs.FSDataOutputStream;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import org.apache.hadoop.fs.Path;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.Cell;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.HConstants;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.36"></a>
+<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.fs.HFileSystem;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.io.FSDataInputStreamWrapper;<a name="line.38"></a>
+<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.io.ByteArrayOutputStream;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.io.ByteBuffInputStream;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.io.ByteBufferSupportDataOutputStream;<a name="line.41"></a>
+<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;<a name="line.42"></a>
+<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.io.encoding.HFileBlockDecodingContext;<a name="line.43"></a>
+<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultDecodingContext;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultEncodingContext;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.io.encoding.HFileBlockEncodingContext;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.nio.MultiByteBuff;<a name="line.48"></a>
+<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.49"></a>
+<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.50"></a>
+<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.util.ChecksumType;<a name="line.51"></a>
+<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.52"></a>
+<span class="sourceLineNo">053</span>import org.apache.hadoop.io.IOUtils;<a name="line.53"></a>
+<span class="sourceLineNo">054</span><a name="line.54"></a>
+<span class="sourceLineNo">055</span>import com.google.common.annotations.VisibleForTesting;<a name="line.55"></a>
+<span class="sourceLineNo">056</span>import com.google.common.base.Preconditions;<a name="line.56"></a>
+<span class="sourceLineNo">057</span><a name="line.57"></a>
+<span class="sourceLineNo">058</span>/**<a name="line.58"></a>
+<span class="sourceLineNo">059</span> * Reads {@link HFile} version 1 and version 2 blocks but writes version 2 blocks only.<a name="line.59"></a>
+<span class="sourceLineNo">060</span> * Version 2 was introduced in hbase-0.92.0. Does read and write out to the filesystem but also<a name="line.60"></a>
+<span class="sourceLineNo">061</span> * the read and write to Cache.<a name="line.61"></a>
+<span class="sourceLineNo">062</span> *<a name="line.62"></a>
+<span class="sourceLineNo">063</span> * &lt;h3&gt;HFileBlock: Version 1&lt;/h3&gt;<a name="line.63"></a>
+<span class="sourceLineNo">064</span> * As of this writing, there should be no more version 1 blocks found out in the wild. Version 2<a name="line.64"></a>
+<span class="sourceLineNo">065</span> * as introduced in hbase-0.92.0.<a name="line.65"></a>
+<span class="sourceLineNo">066</span> * In version 1 all blocks are always compressed or uncompressed, as<a name="line.66"></a>
+<span class="sourceLineNo">067</span> * specified by the {@link HFile}'s compression algorithm, with a type-specific<a name="line.67"></a>
+<span class="sourceLineNo">068</span> * magic record stored in the beginning of the compressed data (i.e. one needs<a name="line.68"></a>
+<span class="sourceLineNo">069</span> * to uncompress the compressed block to determine the block type). There is<a name="line.69"></a>
+<span class="sourceLineNo">070</span> * only a single compression algorithm setting for all blocks. Offset and size<a name="line.70"></a>
+<span class="sourceLineNo">071</span> * information from the block index are required to read a block.<a name="line.71"></a>
+<span class="sourceLineNo">072</span> * &lt;h3&gt;HFileBlock: Version 2&lt;/h3&gt;<a name="line.72"></a>
+<span class="sourceLineNo">073</span> * In version 2, a block is structured as follows:<a name="line.73"></a>
+<span class="sourceLineNo">074</span> * &lt;ul&gt;<a name="line.74"></a>
+<span class="sourceLineNo">075</span> * &lt;li&gt;&lt;b&gt;Header:&lt;/b&gt; See Writer#putHeader(); header total size is HFILEBLOCK_HEADER_SIZE)<a name="line.75"></a>
+<span class="sourceLineNo">076</span> * &lt;ul&gt;<a name="line.76"></a>
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+<span class="sourceLineNo">118</span>   * See #blockDeserializer method for more info.<a name="line.118"></a>
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+<span class="sourceLineNo">146</span>   * ++++++++++++++<a name="line.146"></a>
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