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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.regionserver;</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.FileNotFoundException;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.io.IOException;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.ArrayList;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.Collection;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.util.Collections;</span> |
| <span class="source-line-no">025</span><span id="line-25">import java.util.List;</span> |
| <span class="source-line-no">026</span><span id="line-26">import java.util.Optional;</span> |
| <span class="source-line-no">027</span><span id="line-27">import java.util.PriorityQueue;</span> |
| <span class="source-line-no">028</span><span id="line-28">import java.util.concurrent.atomic.LongAdder;</span> |
| <span class="source-line-no">029</span><span id="line-29">import java.util.function.IntConsumer;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.fs.Path;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.hadoop.hbase.Cell;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.apache.hadoop.hbase.CellComparator;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.apache.hadoop.hbase.ExtendedCell;</span> |
| <span class="source-line-no">034</span><span id="line-34">import org.apache.hadoop.hbase.HBaseInterfaceAudience;</span> |
| <span class="source-line-no">035</span><span id="line-35">import org.apache.hadoop.hbase.HConstants;</span> |
| <span class="source-line-no">036</span><span id="line-36">import org.apache.hadoop.hbase.PrivateCellUtil;</span> |
| <span class="source-line-no">037</span><span id="line-37">import org.apache.hadoop.hbase.client.Scan;</span> |
| <span class="source-line-no">038</span><span id="line-38">import org.apache.hadoop.hbase.io.TimeRange;</span> |
| <span class="source-line-no">039</span><span id="line-39">import org.apache.hadoop.hbase.io.hfile.HFileScanner;</span> |
| <span class="source-line-no">040</span><span id="line-40">import org.apache.hadoop.hbase.regionserver.querymatcher.ScanQueryMatcher;</span> |
| <span class="source-line-no">041</span><span id="line-41">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">042</span><span id="line-42">import org.apache.yetus.audience.InterfaceStability;</span> |
| <span class="source-line-no">043</span><span id="line-43"></span> |
| <span class="source-line-no">044</span><span id="line-44">/**</span> |
| <span class="source-line-no">045</span><span id="line-45"> * KeyValueScanner adaptor over the Reader. It also provides hooks into bloom filter things.</span> |
| <span class="source-line-no">046</span><span id="line-46"> */</span> |
| <span class="source-line-no">047</span><span id="line-47">@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.PHOENIX)</span> |
| <span class="source-line-no">048</span><span id="line-48">@InterfaceStability.Evolving</span> |
| <span class="source-line-no">049</span><span id="line-49">public class StoreFileScanner implements KeyValueScanner {</span> |
| <span class="source-line-no">050</span><span id="line-50"> // the reader it comes from:</span> |
| <span class="source-line-no">051</span><span id="line-51"> private final StoreFileReader reader;</span> |
| <span class="source-line-no">052</span><span id="line-52"> private final HFileScanner hfs;</span> |
| <span class="source-line-no">053</span><span id="line-53"> private ExtendedCell cur = null;</span> |
| <span class="source-line-no">054</span><span id="line-54"> private boolean closed = false;</span> |
| <span class="source-line-no">055</span><span id="line-55"></span> |
| <span class="source-line-no">056</span><span id="line-56"> private boolean realSeekDone;</span> |
| <span class="source-line-no">057</span><span id="line-57"> private boolean delayedReseek;</span> |
| <span class="source-line-no">058</span><span id="line-58"> private ExtendedCell delayedSeekKV;</span> |
| <span class="source-line-no">059</span><span id="line-59"></span> |
| <span class="source-line-no">060</span><span id="line-60"> private final boolean enforceMVCC;</span> |
| <span class="source-line-no">061</span><span id="line-61"> private final boolean hasMVCCInfo;</span> |
| <span class="source-line-no">062</span><span id="line-62"> // A flag represents whether could stop skipping KeyValues for MVCC</span> |
| <span class="source-line-no">063</span><span id="line-63"> // if have encountered the next row. Only used for reversed scan</span> |
| <span class="source-line-no">064</span><span id="line-64"> private boolean stopSkippingKVsIfNextRow = false;</span> |
| <span class="source-line-no">065</span><span id="line-65"> // A Cell that represents the row before the most previously seeked to row in seekToPreviousRow</span> |
| <span class="source-line-no">066</span><span id="line-66"> private Cell previousRow = null;</span> |
| <span class="source-line-no">067</span><span id="line-67"> // Whether the underlying HFile is using a data block encoding that has lower cost for seeking to</span> |
| <span class="source-line-no">068</span><span id="line-68"> // a row from the beginning of a block (i.e. RIV1). If the data block encoding has a high cost for</span> |
| <span class="source-line-no">069</span><span id="line-69"> // seeks, then we can use a modified reverse scanning algorithm to reduce seeks from the beginning</span> |
| <span class="source-line-no">070</span><span id="line-70"> // of the block</span> |
| <span class="source-line-no">071</span><span id="line-71"> private final boolean isFastSeekingEncoding;</span> |
| <span class="source-line-no">072</span><span id="line-72"></span> |
| <span class="source-line-no">073</span><span id="line-73"> private static LongAdder seekCount;</span> |
| <span class="source-line-no">074</span><span id="line-74"></span> |
| <span class="source-line-no">075</span><span id="line-75"> private final boolean canOptimizeForNonNullColumn;</span> |
| <span class="source-line-no">076</span><span id="line-76"></span> |
| <span class="source-line-no">077</span><span id="line-77"> private final long readPt;</span> |
| <span class="source-line-no">078</span><span id="line-78"></span> |
| <span class="source-line-no">079</span><span id="line-79"> // Order of this scanner relative to other scanners when duplicate key-value is found.</span> |
| <span class="source-line-no">080</span><span id="line-80"> // Higher values means scanner has newer data.</span> |
| <span class="source-line-no">081</span><span id="line-81"> private final long scannerOrder;</span> |
| <span class="source-line-no">082</span><span id="line-82"></span> |
| <span class="source-line-no">083</span><span id="line-83"> /**</span> |
| <span class="source-line-no">084</span><span id="line-84"> * Implements a {@link KeyValueScanner} on top of the specified {@link HFileScanner}</span> |
| <span class="source-line-no">085</span><span id="line-85"> * @param useMVCC If true, scanner will filter out updates with MVCC larger</span> |
| <span class="source-line-no">086</span><span id="line-86"> * than {@code readPt}.</span> |
| <span class="source-line-no">087</span><span id="line-87"> * @param readPt MVCC value to use to filter out the updates newer than this</span> |
| <span class="source-line-no">088</span><span id="line-88"> * scanner.</span> |
| <span class="source-line-no">089</span><span id="line-89"> * @param hasMVCC Set to true if underlying store file reader has MVCC info.</span> |
| <span class="source-line-no">090</span><span id="line-90"> * @param scannerOrder Order of the scanner relative to other scanners. See</span> |
| <span class="source-line-no">091</span><span id="line-91"> * {@link KeyValueScanner#getScannerOrder()}.</span> |
| <span class="source-line-no">092</span><span id="line-92"> * @param canOptimizeForNonNullColumn {@code true} if we can make sure there is no null column,</span> |
| <span class="source-line-no">093</span><span id="line-93"> * otherwise {@code false}. This is a hint for optimization.</span> |
| <span class="source-line-no">094</span><span id="line-94"> * @param isFastSeekingEncoding {@code true} if the data block encoding can seek quickly</span> |
| <span class="source-line-no">095</span><span id="line-95"> * from the beginning of a block (i.e. RIV1), otherwise</span> |
| <span class="source-line-no">096</span><span id="line-96"> * {@code false}. This is a hint for optimization.</span> |
| <span class="source-line-no">097</span><span id="line-97"> */</span> |
| <span class="source-line-no">098</span><span id="line-98"> public StoreFileScanner(StoreFileReader reader, HFileScanner hfs, boolean useMVCC,</span> |
| <span class="source-line-no">099</span><span id="line-99"> boolean hasMVCC, long readPt, long scannerOrder, boolean canOptimizeForNonNullColumn,</span> |
| <span class="source-line-no">100</span><span id="line-100"> boolean isFastSeekingEncoding) {</span> |
| <span class="source-line-no">101</span><span id="line-101"> this.readPt = readPt;</span> |
| <span class="source-line-no">102</span><span id="line-102"> this.reader = reader;</span> |
| <span class="source-line-no">103</span><span id="line-103"> this.hfs = hfs;</span> |
| <span class="source-line-no">104</span><span id="line-104"> this.enforceMVCC = useMVCC;</span> |
| <span class="source-line-no">105</span><span id="line-105"> this.hasMVCCInfo = hasMVCC;</span> |
| <span class="source-line-no">106</span><span id="line-106"> this.scannerOrder = scannerOrder;</span> |
| <span class="source-line-no">107</span><span id="line-107"> this.canOptimizeForNonNullColumn = canOptimizeForNonNullColumn;</span> |
| <span class="source-line-no">108</span><span id="line-108"> this.isFastSeekingEncoding = isFastSeekingEncoding;</span> |
| <span class="source-line-no">109</span><span id="line-109"> this.reader.incrementRefCount();</span> |
| <span class="source-line-no">110</span><span id="line-110"> }</span> |
| <span class="source-line-no">111</span><span id="line-111"></span> |
| <span class="source-line-no">112</span><span id="line-112"> /**</span> |
| <span class="source-line-no">113</span><span id="line-113"> * Return an array of scanners corresponding to the given set of store files.</span> |
| <span class="source-line-no">114</span><span id="line-114"> */</span> |
| <span class="source-line-no">115</span><span id="line-115"> public static List<StoreFileScanner> getScannersForStoreFiles(Collection<HStoreFile> files,</span> |
| <span class="source-line-no">116</span><span id="line-116"> boolean cacheBlocks, boolean usePread, boolean isCompaction, boolean useDropBehind, long readPt)</span> |
| <span class="source-line-no">117</span><span id="line-117"> throws IOException {</span> |
| <span class="source-line-no">118</span><span id="line-118"> return getScannersForStoreFiles(files, cacheBlocks, usePread, isCompaction, useDropBehind, null,</span> |
| <span class="source-line-no">119</span><span id="line-119"> readPt);</span> |
| <span class="source-line-no">120</span><span id="line-120"> }</span> |
| <span class="source-line-no">121</span><span id="line-121"></span> |
| <span class="source-line-no">122</span><span id="line-122"> /**</span> |
| <span class="source-line-no">123</span><span id="line-123"> * Return an array of scanners corresponding to the given set of store files, And set the</span> |
| <span class="source-line-no">124</span><span id="line-124"> * ScanQueryMatcher for each store file scanner for further optimization</span> |
| <span class="source-line-no">125</span><span id="line-125"> */</span> |
| <span class="source-line-no">126</span><span id="line-126"> public static List<StoreFileScanner> getScannersForStoreFiles(Collection<HStoreFile> files,</span> |
| <span class="source-line-no">127</span><span id="line-127"> boolean cacheBlocks, boolean usePread, boolean isCompaction, boolean canUseDrop,</span> |
| <span class="source-line-no">128</span><span id="line-128"> ScanQueryMatcher matcher, long readPt) throws IOException {</span> |
| <span class="source-line-no">129</span><span id="line-129"> if (files.isEmpty()) {</span> |
| <span class="source-line-no">130</span><span id="line-130"> return Collections.emptyList();</span> |
| <span class="source-line-no">131</span><span id="line-131"> }</span> |
| <span class="source-line-no">132</span><span id="line-132"> List<StoreFileScanner> scanners = new ArrayList<>(files.size());</span> |
| <span class="source-line-no">133</span><span id="line-133"> boolean canOptimizeForNonNullColumn = matcher != null ? !matcher.hasNullColumnInQuery() : false;</span> |
| <span class="source-line-no">134</span><span id="line-134"> PriorityQueue<HStoreFile> sortedFiles =</span> |
| <span class="source-line-no">135</span><span id="line-135"> new PriorityQueue<>(files.size(), StoreFileComparators.SEQ_ID);</span> |
| <span class="source-line-no">136</span><span id="line-136"> for (HStoreFile file : files) {</span> |
| <span class="source-line-no">137</span><span id="line-137"> // The sort function needs metadata so we need to open reader first before sorting the list.</span> |
| <span class="source-line-no">138</span><span id="line-138"> file.initReader();</span> |
| <span class="source-line-no">139</span><span id="line-139"> sortedFiles.add(file);</span> |
| <span class="source-line-no">140</span><span id="line-140"> }</span> |
| <span class="source-line-no">141</span><span id="line-141"> boolean succ = false;</span> |
| <span class="source-line-no">142</span><span id="line-142"> try {</span> |
| <span class="source-line-no">143</span><span id="line-143"> for (int i = 0, n = files.size(); i < n; i++) {</span> |
| <span class="source-line-no">144</span><span id="line-144"> HStoreFile sf = sortedFiles.remove();</span> |
| <span class="source-line-no">145</span><span id="line-145"> StoreFileScanner scanner;</span> |
| <span class="source-line-no">146</span><span id="line-146"> if (usePread) {</span> |
| <span class="source-line-no">147</span><span id="line-147"> scanner = sf.getPreadScanner(cacheBlocks, readPt, i, canOptimizeForNonNullColumn);</span> |
| <span class="source-line-no">148</span><span id="line-148"> } else {</span> |
| <span class="source-line-no">149</span><span id="line-149"> scanner = sf.getStreamScanner(canUseDrop, cacheBlocks, isCompaction, readPt, i,</span> |
| <span class="source-line-no">150</span><span id="line-150"> canOptimizeForNonNullColumn);</span> |
| <span class="source-line-no">151</span><span id="line-151"> }</span> |
| <span class="source-line-no">152</span><span id="line-152"> scanners.add(scanner);</span> |
| <span class="source-line-no">153</span><span id="line-153"> }</span> |
| <span class="source-line-no">154</span><span id="line-154"> succ = true;</span> |
| <span class="source-line-no">155</span><span id="line-155"> } finally {</span> |
| <span class="source-line-no">156</span><span id="line-156"> if (!succ) {</span> |
| <span class="source-line-no">157</span><span id="line-157"> for (StoreFileScanner scanner : scanners) {</span> |
| <span class="source-line-no">158</span><span id="line-158"> scanner.close();</span> |
| <span class="source-line-no">159</span><span id="line-159"> }</span> |
| <span class="source-line-no">160</span><span id="line-160"> }</span> |
| <span class="source-line-no">161</span><span id="line-161"> }</span> |
| <span class="source-line-no">162</span><span id="line-162"> return scanners;</span> |
| <span class="source-line-no">163</span><span id="line-163"> }</span> |
| <span class="source-line-no">164</span><span id="line-164"></span> |
| <span class="source-line-no">165</span><span id="line-165"> /**</span> |
| <span class="source-line-no">166</span><span id="line-166"> * Get scanners for compaction. We will create a separated reader for each store file to avoid</span> |
| <span class="source-line-no">167</span><span id="line-167"> * contention with normal read request.</span> |
| <span class="source-line-no">168</span><span id="line-168"> */</span> |
| <span class="source-line-no">169</span><span id="line-169"> public static List<StoreFileScanner> getScannersForCompaction(Collection<HStoreFile> files,</span> |
| <span class="source-line-no">170</span><span id="line-170"> boolean canUseDropBehind, long readPt) throws IOException {</span> |
| <span class="source-line-no">171</span><span id="line-171"> List<StoreFileScanner> scanners = new ArrayList<>(files.size());</span> |
| <span class="source-line-no">172</span><span id="line-172"> List<HStoreFile> sortedFiles = new ArrayList<>(files);</span> |
| <span class="source-line-no">173</span><span id="line-173"> Collections.sort(sortedFiles, StoreFileComparators.SEQ_ID);</span> |
| <span class="source-line-no">174</span><span id="line-174"> boolean succ = false;</span> |
| <span class="source-line-no">175</span><span id="line-175"> try {</span> |
| <span class="source-line-no">176</span><span id="line-176"> for (int i = 0, n = sortedFiles.size(); i < n; i++) {</span> |
| <span class="source-line-no">177</span><span id="line-177"> scanners.add(</span> |
| <span class="source-line-no">178</span><span id="line-178"> sortedFiles.get(i).getStreamScanner(canUseDropBehind, false, true, readPt, i, false));</span> |
| <span class="source-line-no">179</span><span id="line-179"> }</span> |
| <span class="source-line-no">180</span><span id="line-180"> succ = true;</span> |
| <span class="source-line-no">181</span><span id="line-181"> } finally {</span> |
| <span class="source-line-no">182</span><span id="line-182"> if (!succ) {</span> |
| <span class="source-line-no">183</span><span id="line-183"> for (StoreFileScanner scanner : scanners) {</span> |
| <span class="source-line-no">184</span><span id="line-184"> scanner.close();</span> |
| <span class="source-line-no">185</span><span id="line-185"> }</span> |
| <span class="source-line-no">186</span><span id="line-186"> }</span> |
| <span class="source-line-no">187</span><span id="line-187"> }</span> |
| <span class="source-line-no">188</span><span id="line-188"> return scanners;</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"> @Override</span> |
| <span class="source-line-no">192</span><span id="line-192"> public String toString() {</span> |
| <span class="source-line-no">193</span><span id="line-193"> return "StoreFileScanner[" + hfs.toString() + ", cur=" + cur + "]";</span> |
| <span class="source-line-no">194</span><span id="line-194"> }</span> |
| <span class="source-line-no">195</span><span id="line-195"></span> |
| <span class="source-line-no">196</span><span id="line-196"> @Override</span> |
| <span class="source-line-no">197</span><span id="line-197"> public ExtendedCell peek() {</span> |
| <span class="source-line-no">198</span><span id="line-198"> return cur;</span> |
| <span class="source-line-no">199</span><span id="line-199"> }</span> |
| <span class="source-line-no">200</span><span id="line-200"></span> |
| <span class="source-line-no">201</span><span id="line-201"> @Override</span> |
| <span class="source-line-no">202</span><span id="line-202"> public ExtendedCell next() throws IOException {</span> |
| <span class="source-line-no">203</span><span id="line-203"> ExtendedCell retKey = cur;</span> |
| <span class="source-line-no">204</span><span id="line-204"></span> |
| <span class="source-line-no">205</span><span id="line-205"> try {</span> |
| <span class="source-line-no">206</span><span id="line-206"> // only seek if we aren't at the end. cur == null implies 'end'.</span> |
| <span class="source-line-no">207</span><span id="line-207"> if (cur != null) {</span> |
| <span class="source-line-no">208</span><span id="line-208"> hfs.next();</span> |
| <span class="source-line-no">209</span><span id="line-209"> setCurrentCell(hfs.getCell());</span> |
| <span class="source-line-no">210</span><span id="line-210"> if (hasMVCCInfo || this.reader.isBulkLoaded()) {</span> |
| <span class="source-line-no">211</span><span id="line-211"> skipKVsNewerThanReadpoint();</span> |
| <span class="source-line-no">212</span><span id="line-212"> }</span> |
| <span class="source-line-no">213</span><span id="line-213"> }</span> |
| <span class="source-line-no">214</span><span id="line-214"> } catch (FileNotFoundException e) {</span> |
| <span class="source-line-no">215</span><span id="line-215"> throw e;</span> |
| <span class="source-line-no">216</span><span id="line-216"> } catch (IOException e) {</span> |
| <span class="source-line-no">217</span><span id="line-217"> throw new IOException("Could not iterate " + this, e);</span> |
| <span class="source-line-no">218</span><span id="line-218"> }</span> |
| <span class="source-line-no">219</span><span id="line-219"> return retKey;</span> |
| <span class="source-line-no">220</span><span id="line-220"> }</span> |
| <span class="source-line-no">221</span><span id="line-221"></span> |
| <span class="source-line-no">222</span><span id="line-222"> @Override</span> |
| <span class="source-line-no">223</span><span id="line-223"> public boolean seek(ExtendedCell key) throws IOException {</span> |
| <span class="source-line-no">224</span><span id="line-224"> if (seekCount != null) seekCount.increment();</span> |
| <span class="source-line-no">225</span><span id="line-225"></span> |
| <span class="source-line-no">226</span><span id="line-226"> try {</span> |
| <span class="source-line-no">227</span><span id="line-227"> try {</span> |
| <span class="source-line-no">228</span><span id="line-228"> if (!seekAtOrAfter(hfs, key)) {</span> |
| <span class="source-line-no">229</span><span id="line-229"> this.cur = null;</span> |
| <span class="source-line-no">230</span><span id="line-230"> return false;</span> |
| <span class="source-line-no">231</span><span id="line-231"> }</span> |
| <span class="source-line-no">232</span><span id="line-232"></span> |
| <span class="source-line-no">233</span><span id="line-233"> setCurrentCell(hfs.getCell());</span> |
| <span class="source-line-no">234</span><span id="line-234"></span> |
| <span class="source-line-no">235</span><span id="line-235"> if (!hasMVCCInfo && this.reader.isBulkLoaded()) {</span> |
| <span class="source-line-no">236</span><span id="line-236"> return skipKVsNewerThanReadpoint();</span> |
| <span class="source-line-no">237</span><span id="line-237"> } else {</span> |
| <span class="source-line-no">238</span><span id="line-238"> return !hasMVCCInfo ? true : skipKVsNewerThanReadpoint();</span> |
| <span class="source-line-no">239</span><span id="line-239"> }</span> |
| <span class="source-line-no">240</span><span id="line-240"> } finally {</span> |
| <span class="source-line-no">241</span><span id="line-241"> realSeekDone = true;</span> |
| <span class="source-line-no">242</span><span id="line-242"> previousRow = null;</span> |
| <span class="source-line-no">243</span><span id="line-243"> }</span> |
| <span class="source-line-no">244</span><span id="line-244"> } catch (FileNotFoundException e) {</span> |
| <span class="source-line-no">245</span><span id="line-245"> throw e;</span> |
| <span class="source-line-no">246</span><span id="line-246"> } catch (IOException ioe) {</span> |
| <span class="source-line-no">247</span><span id="line-247"> throw new IOException("Could not seek " + this + " to key " + key, ioe);</span> |
| <span class="source-line-no">248</span><span id="line-248"> }</span> |
| <span class="source-line-no">249</span><span id="line-249"> }</span> |
| <span class="source-line-no">250</span><span id="line-250"></span> |
| <span class="source-line-no">251</span><span id="line-251"> @Override</span> |
| <span class="source-line-no">252</span><span id="line-252"> public boolean reseek(ExtendedCell key) throws IOException {</span> |
| <span class="source-line-no">253</span><span id="line-253"> if (seekCount != null) seekCount.increment();</span> |
| <span class="source-line-no">254</span><span id="line-254"></span> |
| <span class="source-line-no">255</span><span id="line-255"> try {</span> |
| <span class="source-line-no">256</span><span id="line-256"> try {</span> |
| <span class="source-line-no">257</span><span id="line-257"> if (!reseekAtOrAfter(hfs, key)) {</span> |
| <span class="source-line-no">258</span><span id="line-258"> this.cur = null;</span> |
| <span class="source-line-no">259</span><span id="line-259"> return false;</span> |
| <span class="source-line-no">260</span><span id="line-260"> }</span> |
| <span class="source-line-no">261</span><span id="line-261"> setCurrentCell(hfs.getCell());</span> |
| <span class="source-line-no">262</span><span id="line-262"></span> |
| <span class="source-line-no">263</span><span id="line-263"> if (!hasMVCCInfo && this.reader.isBulkLoaded()) {</span> |
| <span class="source-line-no">264</span><span id="line-264"> return skipKVsNewerThanReadpoint();</span> |
| <span class="source-line-no">265</span><span id="line-265"> } else {</span> |
| <span class="source-line-no">266</span><span id="line-266"> return !hasMVCCInfo ? true : skipKVsNewerThanReadpoint();</span> |
| <span class="source-line-no">267</span><span id="line-267"> }</span> |
| <span class="source-line-no">268</span><span id="line-268"> } finally {</span> |
| <span class="source-line-no">269</span><span id="line-269"> realSeekDone = true;</span> |
| <span class="source-line-no">270</span><span id="line-270"> previousRow = null;</span> |
| <span class="source-line-no">271</span><span id="line-271"> }</span> |
| <span class="source-line-no">272</span><span id="line-272"> } catch (FileNotFoundException e) {</span> |
| <span class="source-line-no">273</span><span id="line-273"> throw e;</span> |
| <span class="source-line-no">274</span><span id="line-274"> } catch (IOException ioe) {</span> |
| <span class="source-line-no">275</span><span id="line-275"> throw new IOException("Could not reseek " + this + " to key " + key, ioe);</span> |
| <span class="source-line-no">276</span><span id="line-276"> }</span> |
| <span class="source-line-no">277</span><span id="line-277"> }</span> |
| <span class="source-line-no">278</span><span id="line-278"></span> |
| <span class="source-line-no">279</span><span id="line-279"> protected void setCurrentCell(ExtendedCell newVal) throws IOException {</span> |
| <span class="source-line-no">280</span><span id="line-280"> this.cur = newVal;</span> |
| <span class="source-line-no">281</span><span id="line-281"> if (this.cur != null && this.reader.isBulkLoaded() && !this.reader.isSkipResetSeqId()) {</span> |
| <span class="source-line-no">282</span><span id="line-282"> PrivateCellUtil.setSequenceId(cur, this.reader.getSequenceID());</span> |
| <span class="source-line-no">283</span><span id="line-283"> }</span> |
| <span class="source-line-no">284</span><span id="line-284"> }</span> |
| <span class="source-line-no">285</span><span id="line-285"></span> |
| <span class="source-line-no">286</span><span id="line-286"> protected boolean skipKVsNewerThanReadpoint() throws IOException {</span> |
| <span class="source-line-no">287</span><span id="line-287"> // We want to ignore all key-values that are newer than our current</span> |
| <span class="source-line-no">288</span><span id="line-288"> // readPoint</span> |
| <span class="source-line-no">289</span><span id="line-289"> Cell startKV = cur;</span> |
| <span class="source-line-no">290</span><span id="line-290"> while (enforceMVCC && cur != null && (cur.getSequenceId() > readPt)) {</span> |
| <span class="source-line-no">291</span><span id="line-291"> boolean hasNext = hfs.next();</span> |
| <span class="source-line-no">292</span><span id="line-292"> setCurrentCell(hfs.getCell());</span> |
| <span class="source-line-no">293</span><span id="line-293"> if (</span> |
| <span class="source-line-no">294</span><span id="line-294"> hasNext && this.stopSkippingKVsIfNextRow && getComparator().compareRows(cur, startKV) > 0</span> |
| <span class="source-line-no">295</span><span id="line-295"> ) {</span> |
| <span class="source-line-no">296</span><span id="line-296"> return false;</span> |
| <span class="source-line-no">297</span><span id="line-297"> }</span> |
| <span class="source-line-no">298</span><span id="line-298"> }</span> |
| <span class="source-line-no">299</span><span id="line-299"></span> |
| <span class="source-line-no">300</span><span id="line-300"> if (cur == null) {</span> |
| <span class="source-line-no">301</span><span id="line-301"> return false;</span> |
| <span class="source-line-no">302</span><span id="line-302"> }</span> |
| <span class="source-line-no">303</span><span id="line-303"></span> |
| <span class="source-line-no">304</span><span id="line-304"> return true;</span> |
| <span class="source-line-no">305</span><span id="line-305"> }</span> |
| <span class="source-line-no">306</span><span id="line-306"></span> |
| <span class="source-line-no">307</span><span id="line-307"> @Override</span> |
| <span class="source-line-no">308</span><span id="line-308"> public void close() {</span> |
| <span class="source-line-no">309</span><span id="line-309"> if (closed) return;</span> |
| <span class="source-line-no">310</span><span id="line-310"> cur = null;</span> |
| <span class="source-line-no">311</span><span id="line-311"> this.hfs.close();</span> |
| <span class="source-line-no">312</span><span id="line-312"> if (this.reader != null) {</span> |
| <span class="source-line-no">313</span><span id="line-313"> this.reader.readCompleted();</span> |
| <span class="source-line-no">314</span><span id="line-314"> }</span> |
| <span class="source-line-no">315</span><span id="line-315"> closed = true;</span> |
| <span class="source-line-no">316</span><span id="line-316"> }</span> |
| <span class="source-line-no">317</span><span id="line-317"></span> |
| <span class="source-line-no">318</span><span id="line-318"> /** Returns false if not found or if k is after the end. */</span> |
| <span class="source-line-no">319</span><span id="line-319"> public static boolean seekAtOrAfter(HFileScanner s, ExtendedCell k) throws IOException {</span> |
| <span class="source-line-no">320</span><span id="line-320"> int result = s.seekTo(k);</span> |
| <span class="source-line-no">321</span><span id="line-321"> if (result < 0) {</span> |
| <span class="source-line-no">322</span><span id="line-322"> if (result == HConstants.INDEX_KEY_MAGIC) {</span> |
| <span class="source-line-no">323</span><span id="line-323"> // using faked key</span> |
| <span class="source-line-no">324</span><span id="line-324"> return true;</span> |
| <span class="source-line-no">325</span><span id="line-325"> }</span> |
| <span class="source-line-no">326</span><span id="line-326"> // Passed KV is smaller than first KV in file, work from start of file</span> |
| <span class="source-line-no">327</span><span id="line-327"> return s.seekTo();</span> |
| <span class="source-line-no">328</span><span id="line-328"> } else if (result > 0) {</span> |
| <span class="source-line-no">329</span><span id="line-329"> // Passed KV is larger than current KV in file, if there is a next</span> |
| <span class="source-line-no">330</span><span id="line-330"> // it is the "after", if not then this scanner is done.</span> |
| <span class="source-line-no">331</span><span id="line-331"> return s.next();</span> |
| <span class="source-line-no">332</span><span id="line-332"> }</span> |
| <span class="source-line-no">333</span><span id="line-333"> // Seeked to the exact key</span> |
| <span class="source-line-no">334</span><span id="line-334"> return true;</span> |
| <span class="source-line-no">335</span><span id="line-335"> }</span> |
| <span class="source-line-no">336</span><span id="line-336"></span> |
| <span class="source-line-no">337</span><span id="line-337"> static boolean reseekAtOrAfter(HFileScanner s, ExtendedCell k) throws IOException {</span> |
| <span class="source-line-no">338</span><span id="line-338"> // This function is similar to seekAtOrAfter function</span> |
| <span class="source-line-no">339</span><span id="line-339"> int result = s.reseekTo(k);</span> |
| <span class="source-line-no">340</span><span id="line-340"> if (result <= 0) {</span> |
| <span class="source-line-no">341</span><span id="line-341"> if (result == HConstants.INDEX_KEY_MAGIC) {</span> |
| <span class="source-line-no">342</span><span id="line-342"> // using faked key</span> |
| <span class="source-line-no">343</span><span id="line-343"> return true;</span> |
| <span class="source-line-no">344</span><span id="line-344"> }</span> |
| <span class="source-line-no">345</span><span id="line-345"> // If up to now scanner is not seeked yet, this means passed KV is smaller</span> |
| <span class="source-line-no">346</span><span id="line-346"> // than first KV in file, and it is the first time we seek on this file.</span> |
| <span class="source-line-no">347</span><span id="line-347"> // So we also need to work from the start of file.</span> |
| <span class="source-line-no">348</span><span id="line-348"> if (!s.isSeeked()) {</span> |
| <span class="source-line-no">349</span><span id="line-349"> return s.seekTo();</span> |
| <span class="source-line-no">350</span><span id="line-350"> }</span> |
| <span class="source-line-no">351</span><span id="line-351"> return true;</span> |
| <span class="source-line-no">352</span><span id="line-352"> }</span> |
| <span class="source-line-no">353</span><span id="line-353"> // passed KV is larger than current KV in file, if there is a next</span> |
| <span class="source-line-no">354</span><span id="line-354"> // it is after, if not then this scanner is done.</span> |
| <span class="source-line-no">355</span><span id="line-355"> return s.next();</span> |
| <span class="source-line-no">356</span><span id="line-356"> }</span> |
| <span class="source-line-no">357</span><span id="line-357"></span> |
| <span class="source-line-no">358</span><span id="line-358"> /**</span> |
| <span class="source-line-no">359</span><span id="line-359"> * @see KeyValueScanner#getScannerOrder()</span> |
| <span class="source-line-no">360</span><span id="line-360"> */</span> |
| <span class="source-line-no">361</span><span id="line-361"> @Override</span> |
| <span class="source-line-no">362</span><span id="line-362"> public long getScannerOrder() {</span> |
| <span class="source-line-no">363</span><span id="line-363"> return scannerOrder;</span> |
| <span class="source-line-no">364</span><span id="line-364"> }</span> |
| <span class="source-line-no">365</span><span id="line-365"></span> |
| <span class="source-line-no">366</span><span id="line-366"> /**</span> |
| <span class="source-line-no">367</span><span id="line-367"> * Pretend we have done a seek but don't do it yet, if possible. The hope is that we find</span> |
| <span class="source-line-no">368</span><span id="line-368"> * requested columns in more recent files and won't have to seek in older files. Creates a fake</span> |
| <span class="source-line-no">369</span><span id="line-369"> * key/value with the given row/column and the highest (most recent) possible timestamp we might</span> |
| <span class="source-line-no">370</span><span id="line-370"> * get from this file. When users of such "lazy scanner" need to know the next KV precisely (e.g.</span> |
| <span class="source-line-no">371</span><span id="line-371"> * when this scanner is at the top of the heap), they run {@link #enforceSeek()}.</span> |
| <span class="source-line-no">372</span><span id="line-372"> * <p></span> |
| <span class="source-line-no">373</span><span id="line-373"> * Note that this function does guarantee that the current KV of this scanner will be advanced to</span> |
| <span class="source-line-no">374</span><span id="line-374"> * at least the given KV. Because of this, it does have to do a real seek in cases when the seek</span> |
| <span class="source-line-no">375</span><span id="line-375"> * timestamp is older than the highest timestamp of the file, e.g. when we are trying to seek to</span> |
| <span class="source-line-no">376</span><span id="line-376"> * the next row/column and use OLDEST_TIMESTAMP in the seek key.</span> |
| <span class="source-line-no">377</span><span id="line-377"> */</span> |
| <span class="source-line-no">378</span><span id="line-378"> @Override</span> |
| <span class="source-line-no">379</span><span id="line-379"> public boolean requestSeek(ExtendedCell kv, boolean forward, boolean useBloom)</span> |
| <span class="source-line-no">380</span><span id="line-380"> throws IOException {</span> |
| <span class="source-line-no">381</span><span id="line-381"> if (kv.getFamilyLength() == 0) {</span> |
| <span class="source-line-no">382</span><span id="line-382"> useBloom = false;</span> |
| <span class="source-line-no">383</span><span id="line-383"> }</span> |
| <span class="source-line-no">384</span><span id="line-384"></span> |
| <span class="source-line-no">385</span><span id="line-385"> boolean haveToSeek = true;</span> |
| <span class="source-line-no">386</span><span id="line-386"> if (useBloom) {</span> |
| <span class="source-line-no">387</span><span id="line-387"> // check ROWCOL Bloom filter first.</span> |
| <span class="source-line-no">388</span><span id="line-388"> if (reader.getBloomFilterType() == BloomType.ROWCOL) {</span> |
| <span class="source-line-no">389</span><span id="line-389"> haveToSeek = reader.passesGeneralRowColBloomFilter(kv);</span> |
| <span class="source-line-no">390</span><span id="line-390"> } else if (</span> |
| <span class="source-line-no">391</span><span id="line-391"> canOptimizeForNonNullColumn</span> |
| <span class="source-line-no">392</span><span id="line-392"> && ((PrivateCellUtil.isDeleteFamily(kv) || PrivateCellUtil.isDeleteFamilyVersion(kv)))</span> |
| <span class="source-line-no">393</span><span id="line-393"> ) {</span> |
| <span class="source-line-no">394</span><span id="line-394"> // if there is no such delete family kv in the store file,</span> |
| <span class="source-line-no">395</span><span id="line-395"> // then no need to seek.</span> |
| <span class="source-line-no">396</span><span id="line-396"> haveToSeek = reader.passesDeleteFamilyBloomFilter(kv.getRowArray(), kv.getRowOffset(),</span> |
| <span class="source-line-no">397</span><span id="line-397"> kv.getRowLength());</span> |
| <span class="source-line-no">398</span><span id="line-398"> }</span> |
| <span class="source-line-no">399</span><span id="line-399"> }</span> |
| <span class="source-line-no">400</span><span id="line-400"></span> |
| <span class="source-line-no">401</span><span id="line-401"> delayedReseek = forward;</span> |
| <span class="source-line-no">402</span><span id="line-402"> delayedSeekKV = kv;</span> |
| <span class="source-line-no">403</span><span id="line-403"></span> |
| <span class="source-line-no">404</span><span id="line-404"> if (haveToSeek) {</span> |
| <span class="source-line-no">405</span><span id="line-405"> // This row/column might be in this store file (or we did not use the</span> |
| <span class="source-line-no">406</span><span id="line-406"> // Bloom filter), so we still need to seek.</span> |
| <span class="source-line-no">407</span><span id="line-407"> realSeekDone = false;</span> |
| <span class="source-line-no">408</span><span id="line-408"> long maxTimestampInFile = reader.getMaxTimestamp();</span> |
| <span class="source-line-no">409</span><span id="line-409"> long seekTimestamp = kv.getTimestamp();</span> |
| <span class="source-line-no">410</span><span id="line-410"> if (seekTimestamp > maxTimestampInFile) {</span> |
| <span class="source-line-no">411</span><span id="line-411"> // Create a fake key that is not greater than the real next key.</span> |
| <span class="source-line-no">412</span><span id="line-412"> // (Lower timestamps correspond to higher KVs.)</span> |
| <span class="source-line-no">413</span><span id="line-413"> // To understand this better, consider that we are asked to seek to</span> |
| <span class="source-line-no">414</span><span id="line-414"> // a higher timestamp than the max timestamp in this file. We know that</span> |
| <span class="source-line-no">415</span><span id="line-415"> // the next point when we have to consider this file again is when we</span> |
| <span class="source-line-no">416</span><span id="line-416"> // pass the max timestamp of this file (with the same row/column).</span> |
| <span class="source-line-no">417</span><span id="line-417"> setCurrentCell(PrivateCellUtil.createFirstOnRowColTS(kv, maxTimestampInFile));</span> |
| <span class="source-line-no">418</span><span id="line-418"> } else {</span> |
| <span class="source-line-no">419</span><span id="line-419"> // This will be the case e.g. when we need to seek to the next</span> |
| <span class="source-line-no">420</span><span id="line-420"> // row/column, and we don't know exactly what they are, so we set the</span> |
| <span class="source-line-no">421</span><span id="line-421"> // seek key's timestamp to OLDEST_TIMESTAMP to skip the rest of this</span> |
| <span class="source-line-no">422</span><span id="line-422"> // row/column.</span> |
| <span class="source-line-no">423</span><span id="line-423"> enforceSeek();</span> |
| <span class="source-line-no">424</span><span id="line-424"> }</span> |
| <span class="source-line-no">425</span><span id="line-425"> return cur != null;</span> |
| <span class="source-line-no">426</span><span id="line-426"> }</span> |
| <span class="source-line-no">427</span><span id="line-427"></span> |
| <span class="source-line-no">428</span><span id="line-428"> // Multi-column Bloom filter optimization.</span> |
| <span class="source-line-no">429</span><span id="line-429"> // Create a fake key/value, so that this scanner only bubbles up to the top</span> |
| <span class="source-line-no">430</span><span id="line-430"> // of the KeyValueHeap in StoreScanner after we scanned this row/column in</span> |
| <span class="source-line-no">431</span><span id="line-431"> // all other store files. The query matcher will then just skip this fake</span> |
| <span class="source-line-no">432</span><span id="line-432"> // key/value and the store scanner will progress to the next column. This</span> |
| <span class="source-line-no">433</span><span id="line-433"> // is obviously not a "real real" seek, but unlike the fake KV earlier in</span> |
| <span class="source-line-no">434</span><span id="line-434"> // this method, we want this to be propagated to ScanQueryMatcher.</span> |
| <span class="source-line-no">435</span><span id="line-435"> setCurrentCell(PrivateCellUtil.createLastOnRowCol(kv));</span> |
| <span class="source-line-no">436</span><span id="line-436"></span> |
| <span class="source-line-no">437</span><span id="line-437"> realSeekDone = true;</span> |
| <span class="source-line-no">438</span><span id="line-438"> return true;</span> |
| <span class="source-line-no">439</span><span id="line-439"> }</span> |
| <span class="source-line-no">440</span><span id="line-440"></span> |
| <span class="source-line-no">441</span><span id="line-441"> StoreFileReader getReader() {</span> |
| <span class="source-line-no">442</span><span id="line-442"> return reader;</span> |
| <span class="source-line-no">443</span><span id="line-443"> }</span> |
| <span class="source-line-no">444</span><span id="line-444"></span> |
| <span class="source-line-no">445</span><span id="line-445"> CellComparator getComparator() {</span> |
| <span class="source-line-no">446</span><span id="line-446"> return reader.getComparator();</span> |
| <span class="source-line-no">447</span><span id="line-447"> }</span> |
| <span class="source-line-no">448</span><span id="line-448"></span> |
| <span class="source-line-no">449</span><span id="line-449"> @Override</span> |
| <span class="source-line-no">450</span><span id="line-450"> public boolean realSeekDone() {</span> |
| <span class="source-line-no">451</span><span id="line-451"> return realSeekDone;</span> |
| <span class="source-line-no">452</span><span id="line-452"> }</span> |
| <span class="source-line-no">453</span><span id="line-453"></span> |
| <span class="source-line-no">454</span><span id="line-454"> @Override</span> |
| <span class="source-line-no">455</span><span id="line-455"> public void enforceSeek() throws IOException {</span> |
| <span class="source-line-no">456</span><span id="line-456"> if (realSeekDone) return;</span> |
| <span class="source-line-no">457</span><span id="line-457"></span> |
| <span class="source-line-no">458</span><span id="line-458"> if (delayedReseek) {</span> |
| <span class="source-line-no">459</span><span id="line-459"> reseek(delayedSeekKV);</span> |
| <span class="source-line-no">460</span><span id="line-460"> } else {</span> |
| <span class="source-line-no">461</span><span id="line-461"> seek(delayedSeekKV);</span> |
| <span class="source-line-no">462</span><span id="line-462"> }</span> |
| <span class="source-line-no">463</span><span id="line-463"> }</span> |
| <span class="source-line-no">464</span><span id="line-464"></span> |
| <span class="source-line-no">465</span><span id="line-465"> @Override</span> |
| <span class="source-line-no">466</span><span id="line-466"> public boolean isFileScanner() {</span> |
| <span class="source-line-no">467</span><span id="line-467"> return true;</span> |
| <span class="source-line-no">468</span><span id="line-468"> }</span> |
| <span class="source-line-no">469</span><span id="line-469"></span> |
| <span class="source-line-no">470</span><span id="line-470"> @Override</span> |
| <span class="source-line-no">471</span><span id="line-471"> public void recordBlockSize(IntConsumer blockSizeConsumer) {</span> |
| <span class="source-line-no">472</span><span id="line-472"> hfs.recordBlockSize(blockSizeConsumer);</span> |
| <span class="source-line-no">473</span><span id="line-473"> }</span> |
| <span class="source-line-no">474</span><span id="line-474"></span> |
| <span class="source-line-no">475</span><span id="line-475"> @Override</span> |
| <span class="source-line-no">476</span><span id="line-476"> public Path getFilePath() {</span> |
| <span class="source-line-no">477</span><span id="line-477"> return reader.getHFileReader().getPath();</span> |
| <span class="source-line-no">478</span><span id="line-478"> }</span> |
| <span class="source-line-no">479</span><span id="line-479"></span> |
| <span class="source-line-no">480</span><span id="line-480"> // Test methods</span> |
| <span class="source-line-no">481</span><span id="line-481"> static final long getSeekCount() {</span> |
| <span class="source-line-no">482</span><span id="line-482"> return seekCount.sum();</span> |
| <span class="source-line-no">483</span><span id="line-483"> }</span> |
| <span class="source-line-no">484</span><span id="line-484"></span> |
| <span class="source-line-no">485</span><span id="line-485"> static final void instrument() {</span> |
| <span class="source-line-no">486</span><span id="line-486"> seekCount = new LongAdder();</span> |
| <span class="source-line-no">487</span><span id="line-487"> }</span> |
| <span class="source-line-no">488</span><span id="line-488"></span> |
| <span class="source-line-no">489</span><span id="line-489"> @Override</span> |
| <span class="source-line-no">490</span><span id="line-490"> public boolean shouldUseScanner(Scan scan, HStore store, long oldestUnexpiredTS) {</span> |
| <span class="source-line-no">491</span><span id="line-491"> // if the file has no entries, no need to validate or create a scanner.</span> |
| <span class="source-line-no">492</span><span id="line-492"> byte[] cf = store.getColumnFamilyDescriptor().getName();</span> |
| <span class="source-line-no">493</span><span id="line-493"> TimeRange timeRange = scan.getColumnFamilyTimeRange().get(cf);</span> |
| <span class="source-line-no">494</span><span id="line-494"> if (timeRange == null) {</span> |
| <span class="source-line-no">495</span><span id="line-495"> timeRange = scan.getTimeRange();</span> |
| <span class="source-line-no">496</span><span id="line-496"> }</span> |
| <span class="source-line-no">497</span><span id="line-497"> return reader.passesTimerangeFilter(timeRange, oldestUnexpiredTS)</span> |
| <span class="source-line-no">498</span><span id="line-498"> && reader.passesKeyRangeFilter(scan)</span> |
| <span class="source-line-no">499</span><span id="line-499"> && reader.passesBloomFilter(scan, scan.getFamilyMap().get(cf));</span> |
| <span class="source-line-no">500</span><span id="line-500"> }</span> |
| <span class="source-line-no">501</span><span id="line-501"></span> |
| <span class="source-line-no">502</span><span id="line-502"> @Override</span> |
| <span class="source-line-no">503</span><span id="line-503"> public boolean seekToPreviousRow(ExtendedCell originalKey) throws IOException {</span> |
| <span class="source-line-no">504</span><span id="line-504"> try {</span> |
| <span class="source-line-no">505</span><span id="line-505"> if (isFastSeekingEncoding) {</span> |
| <span class="source-line-no">506</span><span id="line-506"> return seekToPreviousRowStateless(originalKey);</span> |
| <span class="source-line-no">507</span><span id="line-507"> } else if (previousRow == null || getComparator().compareRows(previousRow, originalKey) > 0) {</span> |
| <span class="source-line-no">508</span><span id="line-508"> return seekToPreviousRowWithoutHint(originalKey);</span> |
| <span class="source-line-no">509</span><span id="line-509"> } else {</span> |
| <span class="source-line-no">510</span><span id="line-510"> return seekToPreviousRowWithHint();</span> |
| <span class="source-line-no">511</span><span id="line-511"> }</span> |
| <span class="source-line-no">512</span><span id="line-512"> } catch (FileNotFoundException e) {</span> |
| <span class="source-line-no">513</span><span id="line-513"> throw e;</span> |
| <span class="source-line-no">514</span><span id="line-514"> } catch (IOException ioe) {</span> |
| <span class="source-line-no">515</span><span id="line-515"> throw new IOException("Could not seekToPreviousRow " + this + " to key " + originalKey, ioe);</span> |
| <span class="source-line-no">516</span><span id="line-516"> } finally {</span> |
| <span class="source-line-no">517</span><span id="line-517"> this.realSeekDone = true;</span> |
| <span class="source-line-no">518</span><span id="line-518"> }</span> |
| <span class="source-line-no">519</span><span id="line-519"> }</span> |
| <span class="source-line-no">520</span><span id="line-520"></span> |
| <span class="source-line-no">521</span><span id="line-521"> /**</span> |
| <span class="source-line-no">522</span><span id="line-522"> * This variant of the {@link StoreFileScanner#seekToPreviousRow(Cell)} method requires one seek</span> |
| <span class="source-line-no">523</span><span id="line-523"> * and one reseek. This method maintains state in {@link StoreFileScanner#previousRow} which only</span> |
| <span class="source-line-no">524</span><span id="line-524"> * makes sense in the context of a sequential row-by-row reverse scan.</span> |
| <span class="source-line-no">525</span><span id="line-525"> * {@link StoreFileScanner#previousRow} should be reset if that is not the case. The reasoning for</span> |
| <span class="source-line-no">526</span><span id="line-526"> * why this method is faster than {@link StoreFileScanner#seekToPreviousRowStateless(Cell)} is</span> |
| <span class="source-line-no">527</span><span id="line-527"> * that seeks are slower as they need to start from the beginning of the file, while reseeks go</span> |
| <span class="source-line-no">528</span><span id="line-528"> * forward from the current position.</span> |
| <span class="source-line-no">529</span><span id="line-529"> */</span> |
| <span class="source-line-no">530</span><span id="line-530"> private boolean seekToPreviousRowWithHint() throws IOException {</span> |
| <span class="source-line-no">531</span><span id="line-531"> do {</span> |
| <span class="source-line-no">532</span><span id="line-532"> // Using our existing seek hint, set our next seek hint</span> |
| <span class="source-line-no">533</span><span id="line-533"> ExtendedCell firstKeyOfPreviousRow = PrivateCellUtil.createFirstOnRow(previousRow);</span> |
| <span class="source-line-no">534</span><span id="line-534"> seekBeforeAndSaveKeyToPreviousRow(firstKeyOfPreviousRow);</span> |
| <span class="source-line-no">535</span><span id="line-535"></span> |
| <span class="source-line-no">536</span><span id="line-536"> // Reseek back to our initial seek hint (i.e. what we think is the start of the</span> |
| <span class="source-line-no">537</span><span id="line-537"> // previous row)</span> |
| <span class="source-line-no">538</span><span id="line-538"> if (!reseekAtOrAfter(firstKeyOfPreviousRow)) {</span> |
| <span class="source-line-no">539</span><span id="line-539"> return false;</span> |
| <span class="source-line-no">540</span><span id="line-540"> }</span> |
| <span class="source-line-no">541</span><span id="line-541"></span> |
| <span class="source-line-no">542</span><span id="line-542"> // If after skipping newer Kvs, we're still in our seek hint row, then we're finished</span> |
| <span class="source-line-no">543</span><span id="line-543"> if (isStillAtSeekTargetAfterSkippingNewerKvs(firstKeyOfPreviousRow)) {</span> |
| <span class="source-line-no">544</span><span id="line-544"> return true;</span> |
| <span class="source-line-no">545</span><span id="line-545"> }</span> |
| <span class="source-line-no">546</span><span id="line-546"></span> |
| <span class="source-line-no">547</span><span id="line-547"> // If the previousRow seek hint is missing, that means that we're at row after the first row</span> |
| <span class="source-line-no">548</span><span id="line-548"> // in the storefile. Use the without-hint seek path to process the final row</span> |
| <span class="source-line-no">549</span><span id="line-549"> if (previousRow == null) {</span> |
| <span class="source-line-no">550</span><span id="line-550"> return seekToPreviousRowWithoutHint(firstKeyOfPreviousRow);</span> |
| <span class="source-line-no">551</span><span id="line-551"> }</span> |
| <span class="source-line-no">552</span><span id="line-552"></span> |
| <span class="source-line-no">553</span><span id="line-553"> // Otherwise, use the previousRow seek hint to continue traversing backwards</span> |
| <span class="source-line-no">554</span><span id="line-554"> } while (true);</span> |
| <span class="source-line-no">555</span><span id="line-555"> }</span> |
| <span class="source-line-no">556</span><span id="line-556"></span> |
| <span class="source-line-no">557</span><span id="line-557"> /**</span> |
| <span class="source-line-no">558</span><span id="line-558"> * This variant of the {@link StoreFileScanner#seekToPreviousRow(Cell)} method requires two seeks</span> |
| <span class="source-line-no">559</span><span id="line-559"> * and one reseek. The extra expense/seek is with the intent of speeding up subsequent calls by</span> |
| <span class="source-line-no">560</span><span id="line-560"> * using the {@link StoreFileScanner#seekToPreviousRowWithHint} which this method seeds the state</span> |
| <span class="source-line-no">561</span><span id="line-561"> * for by setting {@link StoreFileScanner#previousRow}</span> |
| <span class="source-line-no">562</span><span id="line-562"> */</span> |
| <span class="source-line-no">563</span><span id="line-563"> private boolean seekToPreviousRowWithoutHint(Cell originalKey) throws IOException {</span> |
| <span class="source-line-no">564</span><span id="line-564"> // Rewind to the cell before the beginning of this row</span> |
| <span class="source-line-no">565</span><span id="line-565"> ExtendedCell keyAtBeginningOfRow = PrivateCellUtil.createFirstOnRow(originalKey);</span> |
| <span class="source-line-no">566</span><span id="line-566"> if (!seekBefore(keyAtBeginningOfRow)) {</span> |
| <span class="source-line-no">567</span><span id="line-567"> return false;</span> |
| <span class="source-line-no">568</span><span id="line-568"> }</span> |
| <span class="source-line-no">569</span><span id="line-569"></span> |
| <span class="source-line-no">570</span><span id="line-570"> // Rewind before this row and save what we find as a seek hint</span> |
| <span class="source-line-no">571</span><span id="line-571"> ExtendedCell firstKeyOfPreviousRow = PrivateCellUtil.createFirstOnRow(hfs.getCell());</span> |
| <span class="source-line-no">572</span><span id="line-572"> seekBeforeAndSaveKeyToPreviousRow(firstKeyOfPreviousRow);</span> |
| <span class="source-line-no">573</span><span id="line-573"></span> |
| <span class="source-line-no">574</span><span id="line-574"> // Seek back to the start of the previous row</span> |
| <span class="source-line-no">575</span><span id="line-575"> if (!reseekAtOrAfter(firstKeyOfPreviousRow)) {</span> |
| <span class="source-line-no">576</span><span id="line-576"> return false;</span> |
| <span class="source-line-no">577</span><span id="line-577"> }</span> |
| <span class="source-line-no">578</span><span id="line-578"></span> |
| <span class="source-line-no">579</span><span id="line-579"> // If after skipping newer Kvs, we're still in what we thought was the previous</span> |
| <span class="source-line-no">580</span><span id="line-580"> // row, then we can exit</span> |
| <span class="source-line-no">581</span><span id="line-581"> if (isStillAtSeekTargetAfterSkippingNewerKvs(firstKeyOfPreviousRow)) {</span> |
| <span class="source-line-no">582</span><span id="line-582"> return true;</span> |
| <span class="source-line-no">583</span><span id="line-583"> }</span> |
| <span class="source-line-no">584</span><span id="line-584"></span> |
| <span class="source-line-no">585</span><span id="line-585"> // Skipping newer kvs resulted in skipping the entire row that we thought was the</span> |
| <span class="source-line-no">586</span><span id="line-586"> // previous row. If we've set a seek hint, then we can use that to go backwards</span> |
| <span class="source-line-no">587</span><span id="line-587"> // further</span> |
| <span class="source-line-no">588</span><span id="line-588"> if (previousRow != null) {</span> |
| <span class="source-line-no">589</span><span id="line-589"> return seekToPreviousRowWithHint();</span> |
| <span class="source-line-no">590</span><span id="line-590"> }</span> |
| <span class="source-line-no">591</span><span id="line-591"></span> |
| <span class="source-line-no">592</span><span id="line-592"> // If we've made it here, then we weren't able to set a seek hint. This can happen</span> |
| <span class="source-line-no">593</span><span id="line-593"> // only if we're at the beginning of the storefile i.e. there is no row before this</span> |
| <span class="source-line-no">594</span><span id="line-594"> // one</span> |
| <span class="source-line-no">595</span><span id="line-595"> return false;</span> |
| <span class="source-line-no">596</span><span id="line-596"> }</span> |
| <span class="source-line-no">597</span><span id="line-597"></span> |
| <span class="source-line-no">598</span><span id="line-598"> /**</span> |
| <span class="source-line-no">599</span><span id="line-599"> * This variant of the {@link StoreFileScanner#seekToPreviousRow(Cell)} method requires two seeks.</span> |
| <span class="source-line-no">600</span><span id="line-600"> * It should be used if the cost for seeking is lower i.e. when using a fast seeking data block</span> |
| <span class="source-line-no">601</span><span id="line-601"> * encoding like RIV1.</span> |
| <span class="source-line-no">602</span><span id="line-602"> */</span> |
| <span class="source-line-no">603</span><span id="line-603"> private boolean seekToPreviousRowStateless(ExtendedCell originalKey) throws IOException {</span> |
| <span class="source-line-no">604</span><span id="line-604"> ExtendedCell key = originalKey;</span> |
| <span class="source-line-no">605</span><span id="line-605"> do {</span> |
| <span class="source-line-no">606</span><span id="line-606"> ExtendedCell keyAtBeginningOfRow = PrivateCellUtil.createFirstOnRow(key);</span> |
| <span class="source-line-no">607</span><span id="line-607"> if (!seekBefore(keyAtBeginningOfRow)) {</span> |
| <span class="source-line-no">608</span><span id="line-608"> return false;</span> |
| <span class="source-line-no">609</span><span id="line-609"> }</span> |
| <span class="source-line-no">610</span><span id="line-610"></span> |
| <span class="source-line-no">611</span><span id="line-611"> ExtendedCell firstKeyOfPreviousRow = PrivateCellUtil.createFirstOnRow(hfs.getCell());</span> |
| <span class="source-line-no">612</span><span id="line-612"> if (!seekAtOrAfter(firstKeyOfPreviousRow)) {</span> |
| <span class="source-line-no">613</span><span id="line-613"> return false;</span> |
| <span class="source-line-no">614</span><span id="line-614"> }</span> |
| <span class="source-line-no">615</span><span id="line-615"></span> |
| <span class="source-line-no">616</span><span id="line-616"> if (isStillAtSeekTargetAfterSkippingNewerKvs(firstKeyOfPreviousRow)) {</span> |
| <span class="source-line-no">617</span><span id="line-617"> return true;</span> |
| <span class="source-line-no">618</span><span id="line-618"> }</span> |
| <span class="source-line-no">619</span><span id="line-619"> key = firstKeyOfPreviousRow;</span> |
| <span class="source-line-no">620</span><span id="line-620"> } while (true);</span> |
| <span class="source-line-no">621</span><span id="line-621"> }</span> |
| <span class="source-line-no">622</span><span id="line-622"></span> |
| <span class="source-line-no">623</span><span id="line-623"> private boolean seekBefore(ExtendedCell seekKey) throws IOException {</span> |
| <span class="source-line-no">624</span><span id="line-624"> if (seekCount != null) {</span> |
| <span class="source-line-no">625</span><span id="line-625"> seekCount.increment();</span> |
| <span class="source-line-no">626</span><span id="line-626"> }</span> |
| <span class="source-line-no">627</span><span id="line-627"> if (!hfs.seekBefore(seekKey)) {</span> |
| <span class="source-line-no">628</span><span id="line-628"> this.cur = null;</span> |
| <span class="source-line-no">629</span><span id="line-629"> return false;</span> |
| <span class="source-line-no">630</span><span id="line-630"> }</span> |
| <span class="source-line-no">631</span><span id="line-631"></span> |
| <span class="source-line-no">632</span><span id="line-632"> return true;</span> |
| <span class="source-line-no">633</span><span id="line-633"> }</span> |
| <span class="source-line-no">634</span><span id="line-634"></span> |
| <span class="source-line-no">635</span><span id="line-635"> /**</span> |
| <span class="source-line-no">636</span><span id="line-636"> * Seeks before the seek target cell and saves the location to {@link #previousRow}. If there</span> |
| <span class="source-line-no">637</span><span id="line-637"> * doesn't exist a KV in this file before the seek target cell, reposition the scanner at the</span> |
| <span class="source-line-no">638</span><span id="line-638"> * beginning of the storefile (in preparation to a reseek at or after the seek key) and set the</span> |
| <span class="source-line-no">639</span><span id="line-639"> * {@link #previousRow} to null. If {@link #previousRow} is ever non-null and then transitions to</span> |
| <span class="source-line-no">640</span><span id="line-640"> * being null again via this method, that's because there doesn't exist a row before the seek</span> |
| <span class="source-line-no">641</span><span id="line-641"> * target in the storefile (i.e. we're at the beginning of the storefile)</span> |
| <span class="source-line-no">642</span><span id="line-642"> */</span> |
| <span class="source-line-no">643</span><span id="line-643"> private void seekBeforeAndSaveKeyToPreviousRow(ExtendedCell seekKey) throws IOException {</span> |
| <span class="source-line-no">644</span><span id="line-644"> if (seekCount != null) {</span> |
| <span class="source-line-no">645</span><span id="line-645"> seekCount.increment();</span> |
| <span class="source-line-no">646</span><span id="line-646"> }</span> |
| <span class="source-line-no">647</span><span id="line-647"> if (!hfs.seekBefore(seekKey)) {</span> |
| <span class="source-line-no">648</span><span id="line-648"> // Since the above seek failed, we need to position ourselves back at the start of the</span> |
| <span class="source-line-no">649</span><span id="line-649"> // block or else our reseek might fail. seekTo() cannot return false here as at least</span> |
| <span class="source-line-no">650</span><span id="line-650"> // one seekBefore will have returned true by the time we get here</span> |
| <span class="source-line-no">651</span><span id="line-651"> hfs.seekTo();</span> |
| <span class="source-line-no">652</span><span id="line-652"> this.previousRow = null;</span> |
| <span class="source-line-no">653</span><span id="line-653"> } else {</span> |
| <span class="source-line-no">654</span><span id="line-654"> this.previousRow = hfs.getCell();</span> |
| <span class="source-line-no">655</span><span id="line-655"> }</span> |
| <span class="source-line-no">656</span><span id="line-656"> }</span> |
| <span class="source-line-no">657</span><span id="line-657"></span> |
| <span class="source-line-no">658</span><span id="line-658"> private boolean seekAtOrAfter(ExtendedCell seekKey) throws IOException {</span> |
| <span class="source-line-no">659</span><span id="line-659"> if (seekCount != null) {</span> |
| <span class="source-line-no">660</span><span id="line-660"> seekCount.increment();</span> |
| <span class="source-line-no">661</span><span id="line-661"> }</span> |
| <span class="source-line-no">662</span><span id="line-662"> if (!seekAtOrAfter(hfs, seekKey)) {</span> |
| <span class="source-line-no">663</span><span id="line-663"> this.cur = null;</span> |
| <span class="source-line-no">664</span><span id="line-664"> return false;</span> |
| <span class="source-line-no">665</span><span id="line-665"> }</span> |
| <span class="source-line-no">666</span><span id="line-666"></span> |
| <span class="source-line-no">667</span><span id="line-667"> return true;</span> |
| <span class="source-line-no">668</span><span id="line-668"> }</span> |
| <span class="source-line-no">669</span><span id="line-669"></span> |
| <span class="source-line-no">670</span><span id="line-670"> private boolean reseekAtOrAfter(ExtendedCell seekKey) throws IOException {</span> |
| <span class="source-line-no">671</span><span id="line-671"> if (seekCount != null) {</span> |
| <span class="source-line-no">672</span><span id="line-672"> seekCount.increment();</span> |
| <span class="source-line-no">673</span><span id="line-673"> }</span> |
| <span class="source-line-no">674</span><span id="line-674"> if (!reseekAtOrAfter(hfs, seekKey)) {</span> |
| <span class="source-line-no">675</span><span id="line-675"> this.cur = null;</span> |
| <span class="source-line-no">676</span><span id="line-676"> return false;</span> |
| <span class="source-line-no">677</span><span id="line-677"> }</span> |
| <span class="source-line-no">678</span><span id="line-678"></span> |
| <span class="source-line-no">679</span><span id="line-679"> return true;</span> |
| <span class="source-line-no">680</span><span id="line-680"> }</span> |
| <span class="source-line-no">681</span><span id="line-681"></span> |
| <span class="source-line-no">682</span><span id="line-682"> private boolean isStillAtSeekTargetAfterSkippingNewerKvs(Cell seekKey) throws IOException {</span> |
| <span class="source-line-no">683</span><span id="line-683"> setCurrentCell(hfs.getCell());</span> |
| <span class="source-line-no">684</span><span id="line-684"> return skipKvsNewerThanReadpointReversed() && getComparator().compareRows(cur, seekKey) <= 0;</span> |
| <span class="source-line-no">685</span><span id="line-685"> }</span> |
| <span class="source-line-no">686</span><span id="line-686"></span> |
| <span class="source-line-no">687</span><span id="line-687"> private boolean skipKvsNewerThanReadpointReversed() throws IOException {</span> |
| <span class="source-line-no">688</span><span id="line-688"> this.stopSkippingKVsIfNextRow = true;</span> |
| <span class="source-line-no">689</span><span id="line-689"> boolean resultOfSkipKVs;</span> |
| <span class="source-line-no">690</span><span id="line-690"> try {</span> |
| <span class="source-line-no">691</span><span id="line-691"> resultOfSkipKVs = skipKVsNewerThanReadpoint();</span> |
| <span class="source-line-no">692</span><span id="line-692"> } finally {</span> |
| <span class="source-line-no">693</span><span id="line-693"> this.stopSkippingKVsIfNextRow = false;</span> |
| <span class="source-line-no">694</span><span id="line-694"> }</span> |
| <span class="source-line-no">695</span><span id="line-695"></span> |
| <span class="source-line-no">696</span><span id="line-696"> return resultOfSkipKVs;</span> |
| <span class="source-line-no">697</span><span id="line-697"> }</span> |
| <span class="source-line-no">698</span><span id="line-698"></span> |
| <span class="source-line-no">699</span><span id="line-699"> @Override</span> |
| <span class="source-line-no">700</span><span id="line-700"> public boolean seekToLastRow() throws IOException {</span> |
| <span class="source-line-no">701</span><span id="line-701"> Optional<byte[]> lastRow = reader.getLastRowKey();</span> |
| <span class="source-line-no">702</span><span id="line-702"> if (!lastRow.isPresent()) {</span> |
| <span class="source-line-no">703</span><span id="line-703"> return false;</span> |
| <span class="source-line-no">704</span><span id="line-704"> }</span> |
| <span class="source-line-no">705</span><span id="line-705"> ExtendedCell seekKey = PrivateCellUtil.createFirstOnRow(lastRow.get());</span> |
| <span class="source-line-no">706</span><span id="line-706"> if (seek(seekKey)) {</span> |
| <span class="source-line-no">707</span><span id="line-707"> return true;</span> |
| <span class="source-line-no">708</span><span id="line-708"> } else {</span> |
| <span class="source-line-no">709</span><span id="line-709"> return seekToPreviousRow(seekKey);</span> |
| <span class="source-line-no">710</span><span id="line-710"> }</span> |
| <span class="source-line-no">711</span><span id="line-711"> }</span> |
| <span class="source-line-no">712</span><span id="line-712"></span> |
| <span class="source-line-no">713</span><span id="line-713"> @Override</span> |
| <span class="source-line-no">714</span><span id="line-714"> public boolean backwardSeek(ExtendedCell key) throws IOException {</span> |
| <span class="source-line-no">715</span><span id="line-715"> seek(key);</span> |
| <span class="source-line-no">716</span><span id="line-716"> if (cur == null || getComparator().compareRows(cur, key) > 0) {</span> |
| <span class="source-line-no">717</span><span id="line-717"> return seekToPreviousRow(key);</span> |
| <span class="source-line-no">718</span><span id="line-718"> }</span> |
| <span class="source-line-no">719</span><span id="line-719"> return true;</span> |
| <span class="source-line-no">720</span><span id="line-720"> }</span> |
| <span class="source-line-no">721</span><span id="line-721"></span> |
| <span class="source-line-no">722</span><span id="line-722"> @Override</span> |
| <span class="source-line-no">723</span><span id="line-723"> public ExtendedCell getNextIndexedKey() {</span> |
| <span class="source-line-no">724</span><span id="line-724"> return hfs.getNextIndexedKey();</span> |
| <span class="source-line-no">725</span><span id="line-725"> }</span> |
| <span class="source-line-no">726</span><span id="line-726"></span> |
| <span class="source-line-no">727</span><span id="line-727"> @Override</span> |
| <span class="source-line-no">728</span><span id="line-728"> public void shipped() throws IOException {</span> |
| <span class="source-line-no">729</span><span id="line-729"> this.hfs.shipped();</span> |
| <span class="source-line-no">730</span><span id="line-730"> }</span> |
| <span class="source-line-no">731</span><span id="line-731">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
