| <!DOCTYPE HTML> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (17) --> |
| <title>Source code</title> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <meta name="description" content="source: package: org.apache.hadoop.hbase.regionserver, class: SegmentScanner"> |
| <meta name="generator" content="javadoc/SourceToHTMLConverter"> |
| <link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> |
| </head> |
| <body class="source-page"> |
| <main role="main"> |
| <div class="source-container"> |
| <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.IOException;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.Iterator;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.SortedSet;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.function.IntConsumer;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.commons.lang3.NotImplementedException;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.fs.Path;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.Cell;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.ExtendedCell;</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.client.Scan;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">031</span><span id="line-31"></span> |
| <span class="source-line-no">032</span><span id="line-32">/**</span> |
| <span class="source-line-no">033</span><span id="line-33"> * A scanner of a single memstore segment.</span> |
| <span class="source-line-no">034</span><span id="line-34"> */</span> |
| <span class="source-line-no">035</span><span id="line-35">@InterfaceAudience.Private</span> |
| <span class="source-line-no">036</span><span id="line-36">public class SegmentScanner implements KeyValueScanner {</span> |
| <span class="source-line-no">037</span><span id="line-37"></span> |
| <span class="source-line-no">038</span><span id="line-38"> // the observed structure</span> |
| <span class="source-line-no">039</span><span id="line-39"> protected final Segment segment;</span> |
| <span class="source-line-no">040</span><span id="line-40"> // the highest relevant MVCC</span> |
| <span class="source-line-no">041</span><span id="line-41"> private long readPoint;</span> |
| <span class="source-line-no">042</span><span id="line-42"> // the current iterator that can be reinitialized by</span> |
| <span class="source-line-no">043</span><span id="line-43"> // seek(), backwardSeek(), or reseek()</span> |
| <span class="source-line-no">044</span><span id="line-44"> protected Iterator<ExtendedCell> iter;</span> |
| <span class="source-line-no">045</span><span id="line-45"> // the pre-calculated cell to be returned by peek()</span> |
| <span class="source-line-no">046</span><span id="line-46"> protected ExtendedCell current = null;</span> |
| <span class="source-line-no">047</span><span id="line-47"> // or next()</span> |
| <span class="source-line-no">048</span><span id="line-48"> // A flag represents whether could stop skipping KeyValues for MVCC</span> |
| <span class="source-line-no">049</span><span id="line-49"> // if have encountered the next row. Only used for reversed scan</span> |
| <span class="source-line-no">050</span><span id="line-50"> private boolean stopSkippingKVsIfNextRow = false;</span> |
| <span class="source-line-no">051</span><span id="line-51"> // Stop skipping KeyValues for MVCC if finish this row. Only used for reversed scan</span> |
| <span class="source-line-no">052</span><span id="line-52"> private ExtendedCell stopSkippingKVsRow;</span> |
| <span class="source-line-no">053</span><span id="line-53"> // last iterated KVs by seek (to restore the iterator state after reseek)</span> |
| <span class="source-line-no">054</span><span id="line-54"> private ExtendedCell last = null;</span> |
| <span class="source-line-no">055</span><span id="line-55"></span> |
| <span class="source-line-no">056</span><span id="line-56"> // flag to indicate if this scanner is closed</span> |
| <span class="source-line-no">057</span><span id="line-57"> protected boolean closed = false;</span> |
| <span class="source-line-no">058</span><span id="line-58"></span> |
| <span class="source-line-no">059</span><span id="line-59"> /**</span> |
| <span class="source-line-no">060</span><span id="line-60"> * Scanners are ordered from 0 (oldest) to newest in increasing order.</span> |
| <span class="source-line-no">061</span><span id="line-61"> */</span> |
| <span class="source-line-no">062</span><span id="line-62"> protected SegmentScanner(Segment segment, long readPoint) {</span> |
| <span class="source-line-no">063</span><span id="line-63"> this.segment = segment;</span> |
| <span class="source-line-no">064</span><span id="line-64"> this.readPoint = readPoint;</span> |
| <span class="source-line-no">065</span><span id="line-65"> // increase the reference count so the underlying structure will not be de-allocated</span> |
| <span class="source-line-no">066</span><span id="line-66"> this.segment.incScannerCount();</span> |
| <span class="source-line-no">067</span><span id="line-67"> iter = segment.iterator();</span> |
| <span class="source-line-no">068</span><span id="line-68"> // the initialization of the current is required for working with heap of SegmentScanners</span> |
| <span class="source-line-no">069</span><span id="line-69"> updateCurrent();</span> |
| <span class="source-line-no">070</span><span id="line-70"> if (current == null) {</span> |
| <span class="source-line-no">071</span><span id="line-71"> // nothing to fetch from this scanner</span> |
| <span class="source-line-no">072</span><span id="line-72"> close();</span> |
| <span class="source-line-no">073</span><span id="line-73"> }</span> |
| <span class="source-line-no">074</span><span id="line-74"> }</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> /**</span> |
| <span class="source-line-no">077</span><span id="line-77"> * Look at the next Cell in this scanner, but do not iterate the scanner</span> |
| <span class="source-line-no">078</span><span id="line-78"> * @return the currently observed Cell</span> |
| <span class="source-line-no">079</span><span id="line-79"> */</span> |
| <span class="source-line-no">080</span><span id="line-80"> @Override</span> |
| <span class="source-line-no">081</span><span id="line-81"> public ExtendedCell peek() { // sanity check, the current should be always valid</span> |
| <span class="source-line-no">082</span><span id="line-82"> if (closed) {</span> |
| <span class="source-line-no">083</span><span id="line-83"> return null;</span> |
| <span class="source-line-no">084</span><span id="line-84"> }</span> |
| <span class="source-line-no">085</span><span id="line-85"> if (current != null && current.getSequenceId() > readPoint) {</span> |
| <span class="source-line-no">086</span><span id="line-86"> throw new RuntimeException("current is invalid: read point is " + readPoint + ", "</span> |
| <span class="source-line-no">087</span><span id="line-87"> + "while current sequence id is " + current.getSequenceId());</span> |
| <span class="source-line-no">088</span><span id="line-88"> }</span> |
| <span class="source-line-no">089</span><span id="line-89"> return current;</span> |
| <span class="source-line-no">090</span><span id="line-90"> }</span> |
| <span class="source-line-no">091</span><span id="line-91"></span> |
| <span class="source-line-no">092</span><span id="line-92"> /**</span> |
| <span class="source-line-no">093</span><span id="line-93"> * Return the next Cell in this scanner, iterating the scanner</span> |
| <span class="source-line-no">094</span><span id="line-94"> * @return the next Cell or null if end of scanner</span> |
| <span class="source-line-no">095</span><span id="line-95"> */</span> |
| <span class="source-line-no">096</span><span id="line-96"> @Override</span> |
| <span class="source-line-no">097</span><span id="line-97"> public ExtendedCell next() throws IOException {</span> |
| <span class="source-line-no">098</span><span id="line-98"> if (closed) {</span> |
| <span class="source-line-no">099</span><span id="line-99"> return null;</span> |
| <span class="source-line-no">100</span><span id="line-100"> }</span> |
| <span class="source-line-no">101</span><span id="line-101"> ExtendedCell oldCurrent = current;</span> |
| <span class="source-line-no">102</span><span id="line-102"> updateCurrent(); // update the currently observed Cell</span> |
| <span class="source-line-no">103</span><span id="line-103"> return oldCurrent;</span> |
| <span class="source-line-no">104</span><span id="line-104"> }</span> |
| <span class="source-line-no">105</span><span id="line-105"></span> |
| <span class="source-line-no">106</span><span id="line-106"> /**</span> |
| <span class="source-line-no">107</span><span id="line-107"> * Seek the scanner at or after the specified Cell.</span> |
| <span class="source-line-no">108</span><span id="line-108"> * @param cell seek value</span> |
| <span class="source-line-no">109</span><span id="line-109"> * @return true if scanner has values left, false if end of scanner</span> |
| <span class="source-line-no">110</span><span id="line-110"> */</span> |
| <span class="source-line-no">111</span><span id="line-111"> @Override</span> |
| <span class="source-line-no">112</span><span id="line-112"> public boolean seek(ExtendedCell cell) throws IOException {</span> |
| <span class="source-line-no">113</span><span id="line-113"> if (closed) {</span> |
| <span class="source-line-no">114</span><span id="line-114"> return false;</span> |
| <span class="source-line-no">115</span><span id="line-115"> }</span> |
| <span class="source-line-no">116</span><span id="line-116"> if (cell == null) {</span> |
| <span class="source-line-no">117</span><span id="line-117"> close();</span> |
| <span class="source-line-no">118</span><span id="line-118"> return false;</span> |
| <span class="source-line-no">119</span><span id="line-119"> }</span> |
| <span class="source-line-no">120</span><span id="line-120"> // restart the iterator from new key</span> |
| <span class="source-line-no">121</span><span id="line-121"> iter = getIterator(cell);</span> |
| <span class="source-line-no">122</span><span id="line-122"> // last is going to be reinitialized in the next getNext() call</span> |
| <span class="source-line-no">123</span><span id="line-123"> last = null;</span> |
| <span class="source-line-no">124</span><span id="line-124"> updateCurrent();</span> |
| <span class="source-line-no">125</span><span id="line-125"> return (current != null);</span> |
| <span class="source-line-no">126</span><span id="line-126"> }</span> |
| <span class="source-line-no">127</span><span id="line-127"></span> |
| <span class="source-line-no">128</span><span id="line-128"> protected Iterator<ExtendedCell> getIterator(ExtendedCell cell) {</span> |
| <span class="source-line-no">129</span><span id="line-129"> return segment.tailSet(cell).iterator();</span> |
| <span class="source-line-no">130</span><span id="line-130"> }</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"> * Reseek the scanner at or after the specified KeyValue. This method is guaranteed to seek at or</span> |
| <span class="source-line-no">134</span><span id="line-134"> * after the required key only if the key comes after the current position of the scanner. Should</span> |
| <span class="source-line-no">135</span><span id="line-135"> * not be used to seek to a key which may come before the current position.</span> |
| <span class="source-line-no">136</span><span id="line-136"> * @param cell seek value (should be non-null)</span> |
| <span class="source-line-no">137</span><span id="line-137"> * @return true if scanner has values left, false if end of scanner</span> |
| <span class="source-line-no">138</span><span id="line-138"> */</span> |
| <span class="source-line-no">139</span><span id="line-139"> @Override</span> |
| <span class="source-line-no">140</span><span id="line-140"> public boolean reseek(ExtendedCell cell) throws IOException {</span> |
| <span class="source-line-no">141</span><span id="line-141"> if (closed) {</span> |
| <span class="source-line-no">142</span><span id="line-142"> return false;</span> |
| <span class="source-line-no">143</span><span id="line-143"> }</span> |
| <span class="source-line-no">144</span><span id="line-144"> /*</span> |
| <span class="source-line-no">145</span><span id="line-145"> * See HBASE-4195 & HBASE-3855 & HBASE-6591 for the background on this implementation. This code</span> |
| <span class="source-line-no">146</span><span id="line-146"> * is executed concurrently with flush and puts, without locks. The ideal implementation for</span> |
| <span class="source-line-no">147</span><span id="line-147"> * performance would use the sub skip list implicitly pointed by the iterator. Unfortunately the</span> |
| <span class="source-line-no">148</span><span id="line-148"> * Java API does not offer a method to get it. So we remember the last keys we iterated to and</span> |
| <span class="source-line-no">149</span><span id="line-149"> * restore the reseeked set to at least that point.</span> |
| <span class="source-line-no">150</span><span id="line-150"> */</span> |
| <span class="source-line-no">151</span><span id="line-151"> iter = getIterator(getHighest(cell, last));</span> |
| <span class="source-line-no">152</span><span id="line-152"> updateCurrent();</span> |
| <span class="source-line-no">153</span><span id="line-153"> return (current != null);</span> |
| <span class="source-line-no">154</span><span id="line-154"> }</span> |
| <span class="source-line-no">155</span><span id="line-155"></span> |
| <span class="source-line-no">156</span><span id="line-156"> /**</span> |
| <span class="source-line-no">157</span><span id="line-157"> * Seek the scanner at or before the row of specified Cell, it firstly tries to seek the scanner</span> |
| <span class="source-line-no">158</span><span id="line-158"> * at or after the specified Cell, return if peek KeyValue of scanner has the same row with</span> |
| <span class="source-line-no">159</span><span id="line-159"> * specified Cell, otherwise seek the scanner at the first Cell of the row which is the previous</span> |
| <span class="source-line-no">160</span><span id="line-160"> * row of specified KeyValue</span> |
| <span class="source-line-no">161</span><span id="line-161"> * @param key seek Cell</span> |
| <span class="source-line-no">162</span><span id="line-162"> * @return true if the scanner is at the valid KeyValue, false if such Cell does not exist</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 boolean backwardSeek(ExtendedCell key) throws IOException {</span> |
| <span class="source-line-no">166</span><span id="line-166"> if (closed) {</span> |
| <span class="source-line-no">167</span><span id="line-167"> return false;</span> |
| <span class="source-line-no">168</span><span id="line-168"> }</span> |
| <span class="source-line-no">169</span><span id="line-169"> seek(key); // seek forward then go backward</span> |
| <span class="source-line-no">170</span><span id="line-170"> if (peek() == null || segment.compareRows(peek(), key) > 0) {</span> |
| <span class="source-line-no">171</span><span id="line-171"> return seekToPreviousRow(key);</span> |
| <span class="source-line-no">172</span><span id="line-172"> }</span> |
| <span class="source-line-no">173</span><span id="line-173"> return true;</span> |
| <span class="source-line-no">174</span><span id="line-174"> }</span> |
| <span class="source-line-no">175</span><span id="line-175"></span> |
| <span class="source-line-no">176</span><span id="line-176"> /**</span> |
| <span class="source-line-no">177</span><span id="line-177"> * Seek the scanner at the first Cell of the row which is the previous row of specified key</span> |
| <span class="source-line-no">178</span><span id="line-178"> * @param cell seek value</span> |
| <span class="source-line-no">179</span><span id="line-179"> * @return true if the scanner at the first valid Cell of previous row, false if not existing such</span> |
| <span class="source-line-no">180</span><span id="line-180"> * Cell</span> |
| <span class="source-line-no">181</span><span id="line-181"> */</span> |
| <span class="source-line-no">182</span><span id="line-182"> @Override</span> |
| <span class="source-line-no">183</span><span id="line-183"> public boolean seekToPreviousRow(ExtendedCell cell) throws IOException {</span> |
| <span class="source-line-no">184</span><span id="line-184"> if (closed) {</span> |
| <span class="source-line-no">185</span><span id="line-185"> return false;</span> |
| <span class="source-line-no">186</span><span id="line-186"> }</span> |
| <span class="source-line-no">187</span><span id="line-187"> boolean keepSeeking;</span> |
| <span class="source-line-no">188</span><span id="line-188"> Cell key = cell;</span> |
| <span class="source-line-no">189</span><span id="line-189"> do {</span> |
| <span class="source-line-no">190</span><span id="line-190"> ExtendedCell firstKeyOnRow = PrivateCellUtil.createFirstOnRow(key);</span> |
| <span class="source-line-no">191</span><span id="line-191"> SortedSet<ExtendedCell> cellHead = segment.headSet(firstKeyOnRow);</span> |
| <span class="source-line-no">192</span><span id="line-192"> Cell lastCellBeforeRow = cellHead.isEmpty() ? null : cellHead.last();</span> |
| <span class="source-line-no">193</span><span id="line-193"> if (lastCellBeforeRow == null) {</span> |
| <span class="source-line-no">194</span><span id="line-194"> current = null;</span> |
| <span class="source-line-no">195</span><span id="line-195"> return false;</span> |
| <span class="source-line-no">196</span><span id="line-196"> }</span> |
| <span class="source-line-no">197</span><span id="line-197"> ExtendedCell firstKeyOnPreviousRow = PrivateCellUtil.createFirstOnRow(lastCellBeforeRow);</span> |
| <span class="source-line-no">198</span><span id="line-198"> this.stopSkippingKVsIfNextRow = true;</span> |
| <span class="source-line-no">199</span><span id="line-199"> this.stopSkippingKVsRow = firstKeyOnPreviousRow;</span> |
| <span class="source-line-no">200</span><span id="line-200"> seek(firstKeyOnPreviousRow);</span> |
| <span class="source-line-no">201</span><span id="line-201"> this.stopSkippingKVsIfNextRow = false;</span> |
| <span class="source-line-no">202</span><span id="line-202"> if (</span> |
| <span class="source-line-no">203</span><span id="line-203"> peek() == null || segment.getComparator().compareRows(peek(), firstKeyOnPreviousRow) > 0</span> |
| <span class="source-line-no">204</span><span id="line-204"> ) {</span> |
| <span class="source-line-no">205</span><span id="line-205"> keepSeeking = true;</span> |
| <span class="source-line-no">206</span><span id="line-206"> key = firstKeyOnPreviousRow;</span> |
| <span class="source-line-no">207</span><span id="line-207"> continue;</span> |
| <span class="source-line-no">208</span><span id="line-208"> } else {</span> |
| <span class="source-line-no">209</span><span id="line-209"> keepSeeking = false;</span> |
| <span class="source-line-no">210</span><span id="line-210"> }</span> |
| <span class="source-line-no">211</span><span id="line-211"> } while (keepSeeking);</span> |
| <span class="source-line-no">212</span><span id="line-212"> return true;</span> |
| <span class="source-line-no">213</span><span id="line-213"> }</span> |
| <span class="source-line-no">214</span><span id="line-214"></span> |
| <span class="source-line-no">215</span><span id="line-215"> /**</span> |
| <span class="source-line-no">216</span><span id="line-216"> * Seek the scanner at the first KeyValue of last row</span> |
| <span class="source-line-no">217</span><span id="line-217"> * @return true if scanner has values left, false if the underlying data is empty</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"> public boolean seekToLastRow() throws IOException {</span> |
| <span class="source-line-no">221</span><span id="line-221"> if (closed) {</span> |
| <span class="source-line-no">222</span><span id="line-222"> return false;</span> |
| <span class="source-line-no">223</span><span id="line-223"> }</span> |
| <span class="source-line-no">224</span><span id="line-224"> ExtendedCell higherCell = segment.isEmpty() ? null : segment.last();</span> |
| <span class="source-line-no">225</span><span id="line-225"> if (higherCell == null) {</span> |
| <span class="source-line-no">226</span><span id="line-226"> return false;</span> |
| <span class="source-line-no">227</span><span id="line-227"> }</span> |
| <span class="source-line-no">228</span><span id="line-228"></span> |
| <span class="source-line-no">229</span><span id="line-229"> ExtendedCell firstCellOnLastRow = PrivateCellUtil.createFirstOnRow(higherCell);</span> |
| <span class="source-line-no">230</span><span id="line-230"></span> |
| <span class="source-line-no">231</span><span id="line-231"> if (seek(firstCellOnLastRow)) {</span> |
| <span class="source-line-no">232</span><span id="line-232"> return true;</span> |
| <span class="source-line-no">233</span><span id="line-233"> } else {</span> |
| <span class="source-line-no">234</span><span id="line-234"> return seekToPreviousRow(higherCell);</span> |
| <span class="source-line-no">235</span><span id="line-235"> }</span> |
| <span class="source-line-no">236</span><span id="line-236"> }</span> |
| <span class="source-line-no">237</span><span id="line-237"></span> |
| <span class="source-line-no">238</span><span id="line-238"> /**</span> |
| <span class="source-line-no">239</span><span id="line-239"> * Close the KeyValue scanner.</span> |
| <span class="source-line-no">240</span><span id="line-240"> */</span> |
| <span class="source-line-no">241</span><span id="line-241"> @Override</span> |
| <span class="source-line-no">242</span><span id="line-242"> public void close() {</span> |
| <span class="source-line-no">243</span><span id="line-243"> if (closed) {</span> |
| <span class="source-line-no">244</span><span id="line-244"> return;</span> |
| <span class="source-line-no">245</span><span id="line-245"> }</span> |
| <span class="source-line-no">246</span><span id="line-246"> getSegment().decScannerCount();</span> |
| <span class="source-line-no">247</span><span id="line-247"> closed = true;</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"> * This functionality should be resolved in the higher level which is MemStoreScanner, currently</span> |
| <span class="source-line-no">252</span><span id="line-252"> * returns true as default. Doesn't throw IllegalStateException in order not to change the</span> |
| <span class="source-line-no">253</span><span id="line-253"> * signature of the overridden method</span> |
| <span class="source-line-no">254</span><span id="line-254"> */</span> |
| <span class="source-line-no">255</span><span id="line-255"> @Override</span> |
| <span class="source-line-no">256</span><span id="line-256"> public boolean shouldUseScanner(Scan scan, HStore store, long oldestUnexpiredTS) {</span> |
| <span class="source-line-no">257</span><span id="line-257"> return getSegment().shouldSeek(scan.getColumnFamilyTimeRange().getOrDefault(</span> |
| <span class="source-line-no">258</span><span id="line-258"> store.getColumnFamilyDescriptor().getName(), scan.getTimeRange()), oldestUnexpiredTS);</span> |
| <span class="source-line-no">259</span><span id="line-259"> }</span> |
| <span class="source-line-no">260</span><span id="line-260"></span> |
| <span class="source-line-no">261</span><span id="line-261"> @Override</span> |
| <span class="source-line-no">262</span><span id="line-262"> public boolean requestSeek(ExtendedCell c, boolean forward, boolean useBloom) throws IOException {</span> |
| <span class="source-line-no">263</span><span id="line-263"> return NonLazyKeyValueScanner.doRealSeek(this, c, forward);</span> |
| <span class="source-line-no">264</span><span id="line-264"> }</span> |
| <span class="source-line-no">265</span><span id="line-265"></span> |
| <span class="source-line-no">266</span><span id="line-266"> /**</span> |
| <span class="source-line-no">267</span><span id="line-267"> * This scanner is working solely on the in-memory MemStore and doesn't work on store files,</span> |
| <span class="source-line-no">268</span><span id="line-268"> * MutableCellSetSegmentScanner always does the seek, therefore always returning true.</span> |
| <span class="source-line-no">269</span><span id="line-269"> */</span> |
| <span class="source-line-no">270</span><span id="line-270"> @Override</span> |
| <span class="source-line-no">271</span><span id="line-271"> public boolean realSeekDone() {</span> |
| <span class="source-line-no">272</span><span id="line-272"> return true;</span> |
| <span class="source-line-no">273</span><span id="line-273"> }</span> |
| <span class="source-line-no">274</span><span id="line-274"></span> |
| <span class="source-line-no">275</span><span id="line-275"> /**</span> |
| <span class="source-line-no">276</span><span id="line-276"> * This function should be never called on scanners that always do real seek operations (i.e. most</span> |
| <span class="source-line-no">277</span><span id="line-277"> * of the scanners and also this one). The easiest way to achieve this is to call</span> |
| <span class="source-line-no">278</span><span id="line-278"> * {@link #realSeekDone()} first.</span> |
| <span class="source-line-no">279</span><span id="line-279"> */</span> |
| <span class="source-line-no">280</span><span id="line-280"> @Override</span> |
| <span class="source-line-no">281</span><span id="line-281"> public void enforceSeek() throws IOException {</span> |
| <span class="source-line-no">282</span><span id="line-282"> throw new NotImplementedException("enforceSeek cannot be called on a SegmentScanner");</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"> /** Returns true if this is a file scanner. Otherwise a memory scanner is assumed. */</span> |
| <span class="source-line-no">286</span><span id="line-286"> @Override</span> |
| <span class="source-line-no">287</span><span id="line-287"> public boolean isFileScanner() {</span> |
| <span class="source-line-no">288</span><span id="line-288"> return false;</span> |
| <span class="source-line-no">289</span><span id="line-289"> }</span> |
| <span class="source-line-no">290</span><span id="line-290"></span> |
| <span class="source-line-no">291</span><span id="line-291"> @Override</span> |
| <span class="source-line-no">292</span><span id="line-292"> public void recordBlockSize(IntConsumer blockSizeConsumer) {</span> |
| <span class="source-line-no">293</span><span id="line-293"> // do nothing</span> |
| <span class="source-line-no">294</span><span id="line-294"> }</span> |
| <span class="source-line-no">295</span><span id="line-295"></span> |
| <span class="source-line-no">296</span><span id="line-296"> @Override</span> |
| <span class="source-line-no">297</span><span id="line-297"> public Path getFilePath() {</span> |
| <span class="source-line-no">298</span><span id="line-298"> return null;</span> |
| <span class="source-line-no">299</span><span id="line-299"> }</span> |
| <span class="source-line-no">300</span><span id="line-300"></span> |
| <span class="source-line-no">301</span><span id="line-301"> /**</span> |
| <span class="source-line-no">302</span><span id="line-302"> * @return the next key in the index (the key to seek to the next block) if known, or null</span> |
| <span class="source-line-no">303</span><span id="line-303"> * otherwise Not relevant for in-memory scanner</span> |
| <span class="source-line-no">304</span><span id="line-304"> */</span> |
| <span class="source-line-no">305</span><span id="line-305"> @Override</span> |
| <span class="source-line-no">306</span><span id="line-306"> public ExtendedCell getNextIndexedKey() {</span> |
| <span class="source-line-no">307</span><span id="line-307"> return null;</span> |
| <span class="source-line-no">308</span><span id="line-308"> }</span> |
| <span class="source-line-no">309</span><span id="line-309"></span> |
| <span class="source-line-no">310</span><span id="line-310"> /**</span> |
| <span class="source-line-no">311</span><span id="line-311"> * Called after a batch of rows scanned (RPC) and set to be returned to client. Any in between</span> |
| <span class="source-line-no">312</span><span id="line-312"> * cleanup can be done here. Nothing to be done for MutableCellSetSegmentScanner.</span> |
| <span class="source-line-no">313</span><span id="line-313"> */</span> |
| <span class="source-line-no">314</span><span id="line-314"> @Override</span> |
| <span class="source-line-no">315</span><span id="line-315"> public void shipped() throws IOException {</span> |
| <span class="source-line-no">316</span><span id="line-316"> // do nothing</span> |
| <span class="source-line-no">317</span><span id="line-317"> }</span> |
| <span class="source-line-no">318</span><span id="line-318"></span> |
| <span class="source-line-no">319</span><span id="line-319"> // debug method</span> |
| <span class="source-line-no">320</span><span id="line-320"> @Override</span> |
| <span class="source-line-no">321</span><span id="line-321"> public String toString() {</span> |
| <span class="source-line-no">322</span><span id="line-322"> String res = "Store segment scanner of type " + this.getClass().getName() + "; ";</span> |
| <span class="source-line-no">323</span><span id="line-323"> res += "Scanner order " + getScannerOrder() + "; ";</span> |
| <span class="source-line-no">324</span><span id="line-324"> res += getSegment().toString();</span> |
| <span class="source-line-no">325</span><span id="line-325"> return res;</span> |
| <span class="source-line-no">326</span><span id="line-326"> }</span> |
| <span class="source-line-no">327</span><span id="line-327"></span> |
| <span class="source-line-no">328</span><span id="line-328"> /********************* Private Methods **********************/</span> |
| <span class="source-line-no">329</span><span id="line-329"></span> |
| <span class="source-line-no">330</span><span id="line-330"> private Segment getSegment() {</span> |
| <span class="source-line-no">331</span><span id="line-331"> return segment;</span> |
| <span class="source-line-no">332</span><span id="line-332"> }</span> |
| <span class="source-line-no">333</span><span id="line-333"></span> |
| <span class="source-line-no">334</span><span id="line-334"> /**</span> |
| <span class="source-line-no">335</span><span id="line-335"> * Private internal method for iterating over the segment, skipping the cells with irrelevant MVCC</span> |
| <span class="source-line-no">336</span><span id="line-336"> */</span> |
| <span class="source-line-no">337</span><span id="line-337"> protected void updateCurrent() {</span> |
| <span class="source-line-no">338</span><span id="line-338"> ExtendedCell next = null;</span> |
| <span class="source-line-no">339</span><span id="line-339"></span> |
| <span class="source-line-no">340</span><span id="line-340"> try {</span> |
| <span class="source-line-no">341</span><span id="line-341"> while (iter.hasNext()) {</span> |
| <span class="source-line-no">342</span><span id="line-342"> next = iter.next();</span> |
| <span class="source-line-no">343</span><span id="line-343"> if (next.getSequenceId() <= this.readPoint) {</span> |
| <span class="source-line-no">344</span><span id="line-344"> current = next;</span> |
| <span class="source-line-no">345</span><span id="line-345"> return;// skip irrelevant versions</span> |
| <span class="source-line-no">346</span><span id="line-346"> }</span> |
| <span class="source-line-no">347</span><span id="line-347"> // for backwardSeek() stay in the boundaries of a single row</span> |
| <span class="source-line-no">348</span><span id="line-348"> if (stopSkippingKVsIfNextRow && segment.compareRows(next, stopSkippingKVsRow) > 0) {</span> |
| <span class="source-line-no">349</span><span id="line-349"> current = null;</span> |
| <span class="source-line-no">350</span><span id="line-350"> return;</span> |
| <span class="source-line-no">351</span><span id="line-351"> }</span> |
| <span class="source-line-no">352</span><span id="line-352"> } // end of while</span> |
| <span class="source-line-no">353</span><span id="line-353"></span> |
| <span class="source-line-no">354</span><span id="line-354"> current = null; // nothing found</span> |
| <span class="source-line-no">355</span><span id="line-355"> } finally {</span> |
| <span class="source-line-no">356</span><span id="line-356"> if (next != null) {</span> |
| <span class="source-line-no">357</span><span id="line-357"> // in all cases, remember the last KV we iterated to, needed for reseek()</span> |
| <span class="source-line-no">358</span><span id="line-358"> last = next;</span> |
| <span class="source-line-no">359</span><span id="line-359"> }</span> |
| <span class="source-line-no">360</span><span id="line-360"> }</span> |
| <span class="source-line-no">361</span><span id="line-361"> }</span> |
| <span class="source-line-no">362</span><span id="line-362"></span> |
| <span class="source-line-no">363</span><span id="line-363"> /**</span> |
| <span class="source-line-no">364</span><span id="line-364"> * Private internal method that returns the higher of the two key values, or null if they are both</span> |
| <span class="source-line-no">365</span><span id="line-365"> * null</span> |
| <span class="source-line-no">366</span><span id="line-366"> */</span> |
| <span class="source-line-no">367</span><span id="line-367"> private ExtendedCell getHighest(ExtendedCell first, ExtendedCell second) {</span> |
| <span class="source-line-no">368</span><span id="line-368"> if (first == null && second == null) {</span> |
| <span class="source-line-no">369</span><span id="line-369"> return null;</span> |
| <span class="source-line-no">370</span><span id="line-370"> }</span> |
| <span class="source-line-no">371</span><span id="line-371"> if (first != null && second != null) {</span> |
| <span class="source-line-no">372</span><span id="line-372"> int compare = segment.compare(first, second);</span> |
| <span class="source-line-no">373</span><span id="line-373"> return (compare > 0 ? first : second);</span> |
| <span class="source-line-no">374</span><span id="line-374"> }</span> |
| <span class="source-line-no">375</span><span id="line-375"> return (first != null ? first : second);</span> |
| <span class="source-line-no">376</span><span id="line-376"> }</span> |
| <span class="source-line-no">377</span><span id="line-377">}</span> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
