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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.io.encoding;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.io.DataInputStream;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.io.DataOutput;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.io.DataOutputStream;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.io.IOException;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.nio.ByteBuffer;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.ExtendedCell;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.KeyValue;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.KeyValueUtil;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.PrivateCellUtil;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.hbase.nio.ByteBuff;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.util.ByteBufferUtils;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">033</span><span id="line-33"></span> |
| <span class="source-line-no">034</span><span id="line-34">/**</span> |
| <span class="source-line-no">035</span><span id="line-35"> * Compress key by storing size of common prefix with previous KeyValue and storing raw size of</span> |
| <span class="source-line-no">036</span><span id="line-36"> * rest. Format: 1-5 bytes: compressed key length minus prefix (7-bit encoding) 1-5 bytes:</span> |
| <span class="source-line-no">037</span><span id="line-37"> * compressed value length (7-bit encoding) 1-3 bytes: compressed length of common key prefix ...</span> |
| <span class="source-line-no">038</span><span id="line-38"> * bytes: rest of key (including timestamp) ... bytes: value In a worst case compressed KeyValue</span> |
| <span class="source-line-no">039</span><span id="line-39"> * will be three bytes longer than original.</span> |
| <span class="source-line-no">040</span><span id="line-40"> */</span> |
| <span class="source-line-no">041</span><span id="line-41">@InterfaceAudience.Private</span> |
| <span class="source-line-no">042</span><span id="line-42">public class PrefixKeyDeltaEncoder extends BufferedDataBlockEncoder {</span> |
| <span class="source-line-no">043</span><span id="line-43"></span> |
| <span class="source-line-no">044</span><span id="line-44"> @Override</span> |
| <span class="source-line-no">045</span><span id="line-45"> public int internalEncode(ExtendedCell cell, HFileBlockDefaultEncodingContext encodingContext,</span> |
| <span class="source-line-no">046</span><span id="line-46"> DataOutputStream out) throws IOException {</span> |
| <span class="source-line-no">047</span><span id="line-47"> int klength = KeyValueUtil.keyLength(cell);</span> |
| <span class="source-line-no">048</span><span id="line-48"> int vlength = cell.getValueLength();</span> |
| <span class="source-line-no">049</span><span id="line-49"> EncodingState state = encodingContext.getEncodingState();</span> |
| <span class="source-line-no">050</span><span id="line-50"> if (state.prevCell == null) {</span> |
| <span class="source-line-no">051</span><span id="line-51"> // copy the key, there is no common prefix with none</span> |
| <span class="source-line-no">052</span><span id="line-52"> ByteBufferUtils.putCompressedInt(out, klength);</span> |
| <span class="source-line-no">053</span><span id="line-53"> ByteBufferUtils.putCompressedInt(out, vlength);</span> |
| <span class="source-line-no">054</span><span id="line-54"> ByteBufferUtils.putCompressedInt(out, 0);</span> |
| <span class="source-line-no">055</span><span id="line-55"> PrivateCellUtil.writeFlatKey(cell, (DataOutput) out);</span> |
| <span class="source-line-no">056</span><span id="line-56"> } else {</span> |
| <span class="source-line-no">057</span><span id="line-57"> // find a common prefix and skip it</span> |
| <span class="source-line-no">058</span><span id="line-58"> int common = PrivateCellUtil.findCommonPrefixInFlatKey(cell, state.prevCell, true, true);</span> |
| <span class="source-line-no">059</span><span id="line-59"> ByteBufferUtils.putCompressedInt(out, klength - common);</span> |
| <span class="source-line-no">060</span><span id="line-60"> ByteBufferUtils.putCompressedInt(out, vlength);</span> |
| <span class="source-line-no">061</span><span id="line-61"> ByteBufferUtils.putCompressedInt(out, common);</span> |
| <span class="source-line-no">062</span><span id="line-62"> writeKeyExcludingCommon(cell, common, out);</span> |
| <span class="source-line-no">063</span><span id="line-63"> }</span> |
| <span class="source-line-no">064</span><span id="line-64"> // Write the value part</span> |
| <span class="source-line-no">065</span><span id="line-65"> PrivateCellUtil.writeValue(out, cell, vlength);</span> |
| <span class="source-line-no">066</span><span id="line-66"> int size = klength + vlength + KeyValue.KEYVALUE_INFRASTRUCTURE_SIZE;</span> |
| <span class="source-line-no">067</span><span id="line-67"> size += afterEncodingKeyValue(cell, out, encodingContext);</span> |
| <span class="source-line-no">068</span><span id="line-68"> state.prevCell = cell;</span> |
| <span class="source-line-no">069</span><span id="line-69"> return size;</span> |
| <span class="source-line-no">070</span><span id="line-70"> }</span> |
| <span class="source-line-no">071</span><span id="line-71"></span> |
| <span class="source-line-no">072</span><span id="line-72"> private void writeKeyExcludingCommon(ExtendedCell cell, int commonPrefix, DataOutputStream out)</span> |
| <span class="source-line-no">073</span><span id="line-73"> throws IOException {</span> |
| <span class="source-line-no">074</span><span id="line-74"> short rLen = cell.getRowLength();</span> |
| <span class="source-line-no">075</span><span id="line-75"> if (commonPrefix < rLen + KeyValue.ROW_LENGTH_SIZE) {</span> |
| <span class="source-line-no">076</span><span id="line-76"> // Previous and current rows are different. Need to write the differing part followed by</span> |
| <span class="source-line-no">077</span><span id="line-77"> // cf,q,ts and type</span> |
| <span class="source-line-no">078</span><span id="line-78"> PrivateCellUtil.writeRowKeyExcludingCommon(cell, rLen, commonPrefix, out);</span> |
| <span class="source-line-no">079</span><span id="line-79"> byte fLen = cell.getFamilyLength();</span> |
| <span class="source-line-no">080</span><span id="line-80"> out.writeByte(fLen);</span> |
| <span class="source-line-no">081</span><span id="line-81"> PrivateCellUtil.writeFamily(out, cell, fLen);</span> |
| <span class="source-line-no">082</span><span id="line-82"> PrivateCellUtil.writeQualifier(out, cell, cell.getQualifierLength());</span> |
| <span class="source-line-no">083</span><span id="line-83"> out.writeLong(cell.getTimestamp());</span> |
| <span class="source-line-no">084</span><span id="line-84"> out.writeByte(cell.getTypeByte());</span> |
| <span class="source-line-no">085</span><span id="line-85"> } else {</span> |
| <span class="source-line-no">086</span><span id="line-86"> // The full row key part is common. CF part will be common for sure as we deal with Cells in</span> |
| <span class="source-line-no">087</span><span id="line-87"> // same family. Just need write the differing part in q, ts and type</span> |
| <span class="source-line-no">088</span><span id="line-88"> commonPrefix = commonPrefix - (rLen + KeyValue.ROW_LENGTH_SIZE)</span> |
| <span class="source-line-no">089</span><span id="line-89"> - (cell.getFamilyLength() + KeyValue.FAMILY_LENGTH_SIZE);</span> |
| <span class="source-line-no">090</span><span id="line-90"> int qLen = cell.getQualifierLength();</span> |
| <span class="source-line-no">091</span><span id="line-91"> int commonQualPrefix = Math.min(commonPrefix, qLen);</span> |
| <span class="source-line-no">092</span><span id="line-92"> int qualPartLenToWrite = qLen - commonQualPrefix;</span> |
| <span class="source-line-no">093</span><span id="line-93"> if (qualPartLenToWrite > 0) {</span> |
| <span class="source-line-no">094</span><span id="line-94"> PrivateCellUtil.writeQualifierSkippingBytes(out, cell, qLen, commonQualPrefix);</span> |
| <span class="source-line-no">095</span><span id="line-95"> }</span> |
| <span class="source-line-no">096</span><span id="line-96"> commonPrefix -= commonQualPrefix;</span> |
| <span class="source-line-no">097</span><span id="line-97"> // Common part in TS also?</span> |
| <span class="source-line-no">098</span><span id="line-98"> if (commonPrefix > 0) {</span> |
| <span class="source-line-no">099</span><span id="line-99"> int commonTimestampPrefix = Math.min(commonPrefix, KeyValue.TIMESTAMP_SIZE);</span> |
| <span class="source-line-no">100</span><span id="line-100"> if (commonTimestampPrefix < KeyValue.TIMESTAMP_SIZE) {</span> |
| <span class="source-line-no">101</span><span id="line-101"> byte[] curTsBuf = Bytes.toBytes(cell.getTimestamp());</span> |
| <span class="source-line-no">102</span><span id="line-102"> out.write(curTsBuf, commonTimestampPrefix,</span> |
| <span class="source-line-no">103</span><span id="line-103"> KeyValue.TIMESTAMP_SIZE - commonTimestampPrefix);</span> |
| <span class="source-line-no">104</span><span id="line-104"> }</span> |
| <span class="source-line-no">105</span><span id="line-105"> commonPrefix -= commonTimestampPrefix;</span> |
| <span class="source-line-no">106</span><span id="line-106"> if (commonPrefix == 0) {</span> |
| <span class="source-line-no">107</span><span id="line-107"> out.writeByte(cell.getTypeByte());</span> |
| <span class="source-line-no">108</span><span id="line-108"> }</span> |
| <span class="source-line-no">109</span><span id="line-109"> } else {</span> |
| <span class="source-line-no">110</span><span id="line-110"> out.writeLong(cell.getTimestamp());</span> |
| <span class="source-line-no">111</span><span id="line-111"> out.writeByte(cell.getTypeByte());</span> |
| <span class="source-line-no">112</span><span id="line-112"> }</span> |
| <span class="source-line-no">113</span><span id="line-113"> }</span> |
| <span class="source-line-no">114</span><span id="line-114"> }</span> |
| <span class="source-line-no">115</span><span id="line-115"></span> |
| <span class="source-line-no">116</span><span id="line-116"> @Override</span> |
| <span class="source-line-no">117</span><span id="line-117"> protected ByteBuffer internalDecodeKeyValues(DataInputStream source, int allocateHeaderLength,</span> |
| <span class="source-line-no">118</span><span id="line-118"> int skipLastBytes, HFileBlockDefaultDecodingContext decodingCtx) throws IOException {</span> |
| <span class="source-line-no">119</span><span id="line-119"> int decompressedSize = source.readInt();</span> |
| <span class="source-line-no">120</span><span id="line-120"> ByteBuffer buffer = ByteBuffer.allocate(decompressedSize + allocateHeaderLength);</span> |
| <span class="source-line-no">121</span><span id="line-121"> buffer.position(allocateHeaderLength);</span> |
| <span class="source-line-no">122</span><span id="line-122"> int prevKeyOffset = 0;</span> |
| <span class="source-line-no">123</span><span id="line-123"></span> |
| <span class="source-line-no">124</span><span id="line-124"> while (source.available() > skipLastBytes) {</span> |
| <span class="source-line-no">125</span><span id="line-125"> prevKeyOffset = decodeKeyValue(source, buffer, prevKeyOffset);</span> |
| <span class="source-line-no">126</span><span id="line-126"> afterDecodingKeyValue(source, buffer, decodingCtx);</span> |
| <span class="source-line-no">127</span><span id="line-127"> }</span> |
| <span class="source-line-no">128</span><span id="line-128"></span> |
| <span class="source-line-no">129</span><span id="line-129"> if (source.available() != skipLastBytes) {</span> |
| <span class="source-line-no">130</span><span id="line-130"> throw new IllegalStateException("Read too many bytes.");</span> |
| <span class="source-line-no">131</span><span id="line-131"> }</span> |
| <span class="source-line-no">132</span><span id="line-132"></span> |
| <span class="source-line-no">133</span><span id="line-133"> buffer.limit(buffer.position());</span> |
| <span class="source-line-no">134</span><span id="line-134"> return buffer;</span> |
| <span class="source-line-no">135</span><span id="line-135"> }</span> |
| <span class="source-line-no">136</span><span id="line-136"></span> |
| <span class="source-line-no">137</span><span id="line-137"> private int decodeKeyValue(DataInputStream source, ByteBuffer buffer, int prevKeyOffset)</span> |
| <span class="source-line-no">138</span><span id="line-138"> throws IOException, EncoderBufferTooSmallException {</span> |
| <span class="source-line-no">139</span><span id="line-139"> int keyLength = ByteBufferUtils.readCompressedInt(source);</span> |
| <span class="source-line-no">140</span><span id="line-140"> int valueLength = ByteBufferUtils.readCompressedInt(source);</span> |
| <span class="source-line-no">141</span><span id="line-141"> int commonLength = ByteBufferUtils.readCompressedInt(source);</span> |
| <span class="source-line-no">142</span><span id="line-142"> int keyOffset;</span> |
| <span class="source-line-no">143</span><span id="line-143"> keyLength += commonLength;</span> |
| <span class="source-line-no">144</span><span id="line-144"></span> |
| <span class="source-line-no">145</span><span id="line-145"> ensureSpace(buffer, keyLength + valueLength + KeyValue.ROW_OFFSET);</span> |
| <span class="source-line-no">146</span><span id="line-146"></span> |
| <span class="source-line-no">147</span><span id="line-147"> buffer.putInt(keyLength);</span> |
| <span class="source-line-no">148</span><span id="line-148"> buffer.putInt(valueLength);</span> |
| <span class="source-line-no">149</span><span id="line-149"></span> |
| <span class="source-line-no">150</span><span id="line-150"> // copy the prefix</span> |
| <span class="source-line-no">151</span><span id="line-151"> if (commonLength > 0) {</span> |
| <span class="source-line-no">152</span><span id="line-152"> keyOffset = buffer.position();</span> |
| <span class="source-line-no">153</span><span id="line-153"> ByteBufferUtils.copyFromBufferToBuffer(buffer, buffer, prevKeyOffset, commonLength);</span> |
| <span class="source-line-no">154</span><span id="line-154"> } else {</span> |
| <span class="source-line-no">155</span><span id="line-155"> keyOffset = buffer.position();</span> |
| <span class="source-line-no">156</span><span id="line-156"> }</span> |
| <span class="source-line-no">157</span><span id="line-157"></span> |
| <span class="source-line-no">158</span><span id="line-158"> // copy rest of the key and value</span> |
| <span class="source-line-no">159</span><span id="line-159"> int len = keyLength - commonLength + valueLength;</span> |
| <span class="source-line-no">160</span><span id="line-160"> ByteBufferUtils.copyFromStreamToBuffer(buffer, source, len);</span> |
| <span class="source-line-no">161</span><span id="line-161"> return keyOffset;</span> |
| <span class="source-line-no">162</span><span id="line-162"> }</span> |
| <span class="source-line-no">163</span><span id="line-163"></span> |
| <span class="source-line-no">164</span><span id="line-164"> @Override</span> |
| <span class="source-line-no">165</span><span id="line-165"> public ExtendedCell getFirstKeyCellInBlock(ByteBuff block) {</span> |
| <span class="source-line-no">166</span><span id="line-166"> block.mark();</span> |
| <span class="source-line-no">167</span><span id="line-167"> block.position(Bytes.SIZEOF_INT);</span> |
| <span class="source-line-no">168</span><span id="line-168"> int keyLength = ByteBuff.readCompressedInt(block);</span> |
| <span class="source-line-no">169</span><span id="line-169"> // TODO : See if we can avoid these reads as the read values are not getting used</span> |
| <span class="source-line-no">170</span><span id="line-170"> ByteBuff.readCompressedInt(block);</span> |
| <span class="source-line-no">171</span><span id="line-171"> int commonLength = ByteBuff.readCompressedInt(block);</span> |
| <span class="source-line-no">172</span><span id="line-172"> if (commonLength != 0) {</span> |
| <span class="source-line-no">173</span><span id="line-173"> throw new AssertionError(</span> |
| <span class="source-line-no">174</span><span id="line-174"> "Nonzero common length in the first key in " + "block: " + commonLength);</span> |
| <span class="source-line-no">175</span><span id="line-175"> }</span> |
| <span class="source-line-no">176</span><span id="line-176"> ByteBuffer key = block.asSubByteBuffer(keyLength).duplicate();</span> |
| <span class="source-line-no">177</span><span id="line-177"> block.reset();</span> |
| <span class="source-line-no">178</span><span id="line-178"> return createFirstKeyCell(key, keyLength);</span> |
| <span class="source-line-no">179</span><span id="line-179"> }</span> |
| <span class="source-line-no">180</span><span id="line-180"></span> |
| <span class="source-line-no">181</span><span id="line-181"> @Override</span> |
| <span class="source-line-no">182</span><span id="line-182"> public String toString() {</span> |
| <span class="source-line-no">183</span><span id="line-183"> return PrefixKeyDeltaEncoder.class.getSimpleName();</span> |
| <span class="source-line-no">184</span><span id="line-184"> }</span> |
| <span class="source-line-no">185</span><span id="line-185"></span> |
| <span class="source-line-no">186</span><span id="line-186"> @Override</span> |
| <span class="source-line-no">187</span><span id="line-187"> public EncodedSeeker createSeeker(final HFileBlockDecodingContext decodingCtx) {</span> |
| <span class="source-line-no">188</span><span id="line-188"> return new SeekerStateBufferedEncodedSeeker(decodingCtx);</span> |
| <span class="source-line-no">189</span><span id="line-189"> }</span> |
| <span class="source-line-no">190</span><span id="line-190"></span> |
| <span class="source-line-no">191</span><span id="line-191"> private static class SeekerStateBufferedEncodedSeeker extends BufferedEncodedSeeker<SeekerState> {</span> |
| <span class="source-line-no">192</span><span id="line-192"></span> |
| <span class="source-line-no">193</span><span id="line-193"> private SeekerStateBufferedEncodedSeeker(HFileBlockDecodingContext decodingCtx) {</span> |
| <span class="source-line-no">194</span><span id="line-194"> super(decodingCtx);</span> |
| <span class="source-line-no">195</span><span id="line-195"> }</span> |
| <span class="source-line-no">196</span><span id="line-196"></span> |
| <span class="source-line-no">197</span><span id="line-197"> @Override</span> |
| <span class="source-line-no">198</span><span id="line-198"> protected void decodeNext() {</span> |
| <span class="source-line-no">199</span><span id="line-199"> current.keyLength = ByteBuff.readCompressedInt(currentBuffer);</span> |
| <span class="source-line-no">200</span><span id="line-200"> current.valueLength = ByteBuff.readCompressedInt(currentBuffer);</span> |
| <span class="source-line-no">201</span><span id="line-201"> current.lastCommonPrefix = ByteBuff.readCompressedInt(currentBuffer);</span> |
| <span class="source-line-no">202</span><span id="line-202"> current.keyLength += current.lastCommonPrefix;</span> |
| <span class="source-line-no">203</span><span id="line-203"> current.ensureSpaceForKey();</span> |
| <span class="source-line-no">204</span><span id="line-204"> currentBuffer.get(current.keyBuffer, current.lastCommonPrefix,</span> |
| <span class="source-line-no">205</span><span id="line-205"> current.keyLength - current.lastCommonPrefix);</span> |
| <span class="source-line-no">206</span><span id="line-206"> current.valueOffset = currentBuffer.position();</span> |
| <span class="source-line-no">207</span><span id="line-207"> currentBuffer.skip(current.valueLength);</span> |
| <span class="source-line-no">208</span><span id="line-208"> if (includesTags()) {</span> |
| <span class="source-line-no">209</span><span id="line-209"> decodeTags();</span> |
| <span class="source-line-no">210</span><span id="line-210"> }</span> |
| <span class="source-line-no">211</span><span id="line-211"> if (includesMvcc()) {</span> |
| <span class="source-line-no">212</span><span id="line-212"> current.memstoreTS = ByteBufferUtils.readVLong(currentBuffer);</span> |
| <span class="source-line-no">213</span><span id="line-213"> } else {</span> |
| <span class="source-line-no">214</span><span id="line-214"> current.memstoreTS = 0;</span> |
| <span class="source-line-no">215</span><span id="line-215"> }</span> |
| <span class="source-line-no">216</span><span id="line-216"> current.nextKvOffset = currentBuffer.position();</span> |
| <span class="source-line-no">217</span><span id="line-217"> }</span> |
| <span class="source-line-no">218</span><span id="line-218"></span> |
| <span class="source-line-no">219</span><span id="line-219"> @Override</span> |
| <span class="source-line-no">220</span><span id="line-220"> protected void decodeFirst() {</span> |
| <span class="source-line-no">221</span><span id="line-221"> currentBuffer.skip(Bytes.SIZEOF_INT);</span> |
| <span class="source-line-no">222</span><span id="line-222"> decodeNext();</span> |
| <span class="source-line-no">223</span><span id="line-223"> }</span> |
| <span class="source-line-no">224</span><span id="line-224"> }</span> |
| <span class="source-line-no">225</span><span id="line-225">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
