You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@hbase.apache.org by mi...@apache.org on 2016/03/04 18:50:47 UTC
[03/51] [partial] hbase-site git commit: Published site at
7dabcf23e8dd53f563981e1e03f82336fc0a44da.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/3e48e84d/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockWritable.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockWritable.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockWritable.html
index 9a60dce..fcaf416 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockWritable.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockWritable.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> * <ul><a name="line.58"></a>
-<span class="sourceLineNo">059</span> * <li>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> * <li>In version 2 a block is structured as follows:<a name="line.65"></a>
-<span class="sourceLineNo">066</span> * <ul><a name="line.66"></a>
-<span class="sourceLineNo">067</span> * <li>header (see Writer#finishBlock())<a name="line.67"></a>
-<span class="sourceLineNo">068</span> * <ul><a name="line.68"></a>
-<span class="sourceLineNo">069</span> * <li>Magic record identifying the block type (8 bytes)<a name="line.69"></a>
-<span class="sourceLineNo">070</span> * <li>Compressed block size, excluding header, including checksum (4 bytes)<a name="line.70"></a>
-<span class="sourceLineNo">071</span> * <li>Uncompressed block size, excluding header, excluding checksum (4 bytes)<a name="line.71"></a>
-<span class="sourceLineNo">072</span> * <li>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> * <li>For minorVersions &gt;=1, the ordinal describing checksum type (1 byte)<a name="line.74"></a>
-<span class="sourceLineNo">075</span> * <li>For minorVersions &gt;=1, the number of data bytes/checksum chunk (4 bytes)<a name="line.75"></a>
-<span class="sourceLineNo">076</span> * <li>For minorVersions &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> * </ul><a name="line.78"></a>
-<span class="sourceLineNo">079</span> * </li><a name="line.79"></a>
-<span class="sourceLineNo">080</span> * <li>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> * <li>For minorVersions &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> * </ul><a name="line.85"></a>
-<span class="sourceLineNo">086</span> * </ul><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<Cacheable> blockDeserializer =<a name="line.124"></a>
-<span class="sourceLineNo">125</span> new CacheableDeserializer<Cacheable>() {<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> * <h3>HFileBlock: Version 1</h3><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> * <h3>HFileBlock: Version 2</h3><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> * <ul><a name="line.74"></a>
+<span class="sourceLineNo">075</span> * <li><b>Header:</b> See Writer#putHeader(); header total size is HFILEBLOCK_HEADER_SIZE)<a name="line.75"></a>
+<span class="sourceLineNo">076</span> * <ul><a name="line.76"></a>
+<span class="sourceLineNo">077</span> * <li>Magic record identifying the {@link BlockType} (8 bytes): e.g. <code>DATABLK*</code><a name="line.77"></a>
+<span class="sourceLineNo">078</span> * <li>Compressed -- a.k.a 'on disk' -- block size, excluding header, but including<a name="line.78"></a>
+<span class="sourceLineNo">079</span> * tailing checksum bytes (4 bytes)<a name="line.79"></a>
+<span class="sourceLineNo">080</span> * <li>Uncompressed block size, excluding header, and excluding checksum bytes (4 bytes)<a name="line.80"></a>
+<span class="sourceLineNo">081</span> * <li>The offset of the previous block of the same type (8 bytes). This is<a name="line.81"></a>
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+<span class="sourceLineNo">102</span><a name="line.102"></a>
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+<span class="sourceLineNo">105</span> * auto-reenabling hbase checksum verification.<a name="line.105"></a>
+<span class="sourceLineNo">106</span> */<a name="line.106"></a>
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+<span class="sourceLineNo">112</span><a name="line.112"></a>
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+<span class="sourceLineNo">116</span><a name="line.116"></a>
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+<span class="sourceLineNo">118</span> * See #blockDeserializer method for more info.<a name="line.118"></a>
+<span class="sourceLineNo">119</span> * 13 bytes of extra stuff stuck on the end of the HFileBlock that we pull in from HDFS (note,<a name="line.119"></a>
+<span class="sourceLineNo">120</span> * when we read from HDFS, we pull in an HFileBlock AND the header of the next block if one).<a name="line.120"></a>
+<span class="sourceLineNo">121</span> * The 13 bytes are: usesHBaseChecksum (1 byte) + offset of this block (long) +<a name="line.121"></a>
+<span class="sourceLineNo">122</span> * nextBlockOnDiskSizeWithHeader (int).<a name="line.122"></a>
+<span class="sourceLineNo">123</span> */<a name="line.123"></a>
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+<span class="sourceLineNo">125</span> Bytes.SIZEOF_BYTE + Bytes.SIZEOF_INT + Bytes.SIZEOF_LONG;<a name="line.125"></a>
+<span class="sourceLineNo">126</span><a name="line.126"></a>
+<span class="sourceLineNo">127</span> /**<a name="line.127"></a>
+<span class="sourceLineNo">128</span> * Each checksum value is an integer that can be stored in 4 bytes.<a name="line.128"></a>
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+<span class="sourceLineNo">130</span> static final int CHECKSUM_SIZE = Bytes.SIZEOF_INT;<a name="line.130"></a>
+<span class="sourceLineNo">131</span><a name="line.131"></a>
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+<span class="sourceLineNo">133</span> new byte[HConstants.HFILEBLOCK_HEADER_SIZE_NO_CHECKSUM];<a name="line.133"></a>
+<span class="sourceLineNo">134</span><a name="line.134"></a>
+<span class="sourceLineNo">135</span> /**<a name="line.135"></a>
+<span class="sourceLineNo">136</span> * Used deserializing blocks from Cache.<a name="line.136"></a>
+<span class="sourceLineNo">137</span> *<a name="line.137"></a>
+<span class="sourceLineNo">138</span> * Serializing to cache is a little hard to follow. See Writer#finishBlock for where it is done.<a name="line.138"></a>
+<span class="sourceLineNo">139</span> * When we start to append to a new HFileBlock,<a name="line.139"></a>
+<span class="sourceLineNo">140</span> * we skip over where the header should go before we start adding Cells. When the block is<a name="line.140"></a>
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+<span class="sourceLineNo">142</span> * gets serialized into the blockcache is a byte array that contains an HFileBlock followed by<a name="line.142"></a>
+<span class="sourceLineNo">143</span> * its checksums and then the header of the next HFileBlock (needed to help navigate), followed<a name="line.143"></a>
+<span class="sourceLineNo">144</span> * again by an extra 13 bytes of meta info needed when time to recreate the HFileBlock from cache.<a name="line.144"></a>
+<span class="sourceLineNo">145</span> *<a name="line.145"></a>
+<span class="sourceLineNo">146</span> * ++++++++++++++<a name="line.146"></a>
+<span class="sourceLineNo">147</span> * + HFileBlock +<a name="line.147"></a>
+<span class="sourceLineNo">148</span> * ++++++++++++++<a name="line.148"></a>
+<span class="sourceLineNo">149</span> * + Checksums +<a name="line.149"></a>
+<span class="sourceLineNo">150</span> * ++++++++++++++<a name="line.150"></a>
+<span class="sourceLineNo">151</span> * + NextHeader +<a name="line.151"></a>
+<span class="sourceLineNo">152</span> * ++++++++++++++<a name="line.152"></a>
+<span class="sourceLineNo">153</span> * + ExtraMeta! +<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>
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+<span class="sourceLineNo">157</span> */<a name="line.157"></a>
+<span class="sourceLineNo">158</span> static final CacheableDeserializer<Cacheable> blockDeserializer =<a name="line.158"></a>
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+<span class="sourceLineNo">160</span> public HFileBlock deserialize(ByteBuff buf, boolean reuse, MemoryType memType)<a name="line.160"></a>
+<span class="sourceLineNo">161</span> throws IOException {<a name="line.161"></a>
+<span class="sourceLineNo">162</span> // Rewind to just before the EXTRA_SERIALIZATION_SPACE.<a name="line.162"></a>
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+<span class="sourceLineNo">165</span> ByteBuff newByteBuffer;<a name="line.165"></a>
+<span class="sourceLineNo">166</span> if (reuse) {<a name="line.166"></a>
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+<span class="sourceLineNo">171</span> newByteBuffer.put(0, buf, buf.position(), len);<a name="line.171"></a>
+<span class="sourceLineNo">172</span> }<a name="line.172"></a>
+<span class="sourceLineNo">173</span> // Read out the EXTRA_SERIALIZATION_SPACE content and shove into our HFileBlock.<a name="line.173"></a>
+<span class="sourceLineNo">174</span> buf.position(buf.limit());<a name="line.174"></a>
+<span class="sourceLineNo">175</span> buf.limit(buf.limit() + HFileBlock.EXTRA_SERIALIZATION_SPACE);<a name="line.175"></a>
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+<span class="sourceLineNo">177</span> HFileBlock hFileBlock = new HFileBlock(newByteBuffer, usesChecksum, memType);<a name="line.177"></a>
+<span class="sourceLineNo">178</span> hFileBlock.offset = buf.getLong();<a name="line.178"></a>
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+<span class="sourceLineNo">180</span> if (hFileBlock.hasNextBlockHeader()) {<a name="line.180"></a>
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+<span class="sourceLineNo">182</span> }<a name="line.182"></a>
+<span class="sourceLineNo">183</span> return hFileBlock;<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> @Override<a name="line.186"></a>
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-<span class="sourceLineNo">193</span> * convenience of access. This offset is not part of the block header.<a name="line.193"></a>
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-<span class="sourceLineNo">199</span> * peeking into the first {@link HConstants#HFILEBLOCK_HEADER_SIZE} bytes of the next block's<a name="line.199"></a>
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-<span class="sourceLineNo">201</span> */<a name="line.201"></a>
-<span class="sourceLineNo">202</span> private int nextBlockOnDiskSizeWithHeader = -1;<a name="line.202"></a>
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+<span class="sourceLineNo">192</span> public HFileBlock deserialize(ByteBuff b) throws IOException {<a name="line.192"></a>
+<span class="sourceLineNo">193</span> // Used only in tests<a name="line.193"></a>
+<span class="sourceLineNo">194</span> return deserialize(b, false, MemoryType.EXCLUSIVE);<a name="line.194"></a>
+<span class="sourceLineNo">195</span> }<a name="line.195"></a>
+<span class="sourceLineNo">196</span> };<a name="line.196"></a>
+<span class="sourceLineNo">197</span><a name="line.197"></a>
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+<span class="sourceLineNo">200</span> deserializerIdentifier = CacheableDeserializerIdManager<a name="line.200"></a>
+<span class="sourceLineNo">201</span> .registerDeserializer(blockDeserializer);<a name="line.201"></a>
+<span class="sourceLineNo">202</span> }<a name="line.202"></a>
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-<span class="sourceLineNo">204</span> private MemoryType memType = MemoryType.EXCLUSIVE;<a name="line.204"></a>
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-<span class="sourceLineNo">209</span> * and is sitting in a byte buffer.<a name="line.209"></a>
-<span class="sourceLineNo">210</span> *<a name="line.210"></a>
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-<span class="sourceLineNo">214</span> * @param prevBlockOffset see {@link #prevBlockOffset}<a name="line.214"></a>
-<span class="sourceLineNo">215</span> * @param buf block header ({@link HConstants#HFILEBLOCK_HEADER_SIZE} bytes) followed by<a name="line.215"></a>
-<span class="sourceLineNo">216</span> * uncompressed data. This<a name="line.216"></a>
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-<span class="sourceLineNo">218</span> * @param offset the file offset the block was read from<a name="line.218"></a>
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-<span class="sourceLineNo">220</span> * @param fileContext HFile meta data<a name="line.220"></a>
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-<span class="sourceLineNo">228</span> this.prevBlockOffset = prevBlockOffset;<a name="line.228"></a>
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-<span class="sourceLineNo">230</span> this.offset = offset;<a name="line.230"></a>
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+<span class="sourceLineNo">204</span> /** Type of block. Header field 0. */<a name="line.204"></a>
+<span class="sourceLineNo">205</span> private BlockType blockType;<a name="line.205"></a>
+<span class="sourceLineNo">206</span><a name="line.206"></a>
+<span class="sourceLineNo">207</span> /**<a name="line.207"></a>
+<span class="sourceLineNo">208</span> * Size on disk excluding header, including checksum. Header field 1.<a name="line.208"></a>
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+<span class="sourceLineNo">210</span> */<a name="line.210"></a>
+<span class="sourceLineNo">211</span> private int onDiskSizeWithoutHeader;<a name="line.211"></a>
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+<span class="sourceLineNo">213</span> /**<a name="line.213"></a>
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+<span class="sourceLineNo">215</span> * @see Writer#putHeader(byte[], int, int, int, int)<a name="line.215"></a>
+<span class="sourceLineNo">216</span> */<a name="line.216"></a>
+<span class="sourceLineNo">217</span> private final int uncompressedSizeWithoutHeader;<a name="line.217"></a>
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+<span class="sourceLineNo">219</span> /**<a name="line.219"></a>
+<span class="sourceLineNo">220</span> * The offset of the previous block on disk. Header field 3.<a name="line.220"></a>
+<span class="sourceLineNo">221</span> * @see Writer#putHeader(byte[], int, int, int, int)<a name="line.221"></a>
+<span class="sourceLineNo">222</span> */<a name="line.222"></a>
+<span class="sourceLineNo">223</span> private final long prevBlockOffset;<a name="line.223"></a>
+<span class="sourceLineNo">224</span><a name="line.224"></a>
+<span class="sourceLineNo">225</span> /**<a name="line.225"></a>
+<span class="sourceLineNo">226</span> * Size on disk of header + data. Excludes checksum. Header field 6,<a name="line.226"></a>
+<span class="sourceLineNo">227</span> * OR calculated from {@link #onDiskSizeWithoutHeader} when using HDFS checksum.<a name="line.227"></a>
+<span class="sourceLineNo">228</span> * @see Writer#putHeader(byte[], int, int, int, int)<a name="line.228"></a>
+<span class="sourceLineNo">229</span> */<a name="line.229"></a>
+<span class="sourceLineNo">230</span> private final int onDiskDataSizeWithHeader;<a name="line.230"></a>
+<span class="sourceLineNo">231</span><a name="line.231"></a>
+<span class="sourceLineNo">232</span> /** The in-memory representation of the hfile block */<a name="line.232"></a>
+<span class="sourceLineNo">233</span> private ByteBuff buf;<a name="line.233"></a>
+<span class="sourceLineNo">234</span><a name="line.234"></a>
+<span class="sourceLineNo">235</span> /** Meta data that holds meta information on the hfileblock */<a name="line.235"></a>
+<span class="sourceLineNo">236</span> private HFileContext fileContext;<a name="line.236"></a>
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-<span class="sourceLineNo">245</span> /**<a name="line.245"></a>
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-<span class="sourceLineNo">251</span> this.uncompressedSizeWithoutHeader = that.uncompressedSizeWithoutHeader;<a name="line.251"></a>
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-<span class="sourceLineNo">254</span> this.offset = that.offset;<a name="line.254"></a>
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