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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.IOException;</span>
<span class="source-line-no">021</span><span id="line-21">import org.apache.hadoop.hbase.Cell;</span>
<span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.hbase.CellComparator;</span>
<span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.hbase.CellUtil;</span>
<span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.ExtendedCell;</span>
<span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.util.ClassSize;</span>
<span class="source-line-no">026</span><span id="line-26">import org.apache.yetus.audience.InterfaceAudience;</span>
<span class="source-line-no">027</span><span id="line-27"></span>
<span class="source-line-no">028</span><span id="line-28">/**</span>
<span class="source-line-no">029</span><span id="line-29"> * CellArrayImmutableSegment extends the API supported by a {@link Segment}, and</span>
<span class="source-line-no">030</span><span id="line-30"> * {@link ImmutableSegment}. This immutable segment is working with CellSet with CellArrayMap</span>
<span class="source-line-no">031</span><span id="line-31"> * delegatee.</span>
<span class="source-line-no">032</span><span id="line-32"> */</span>
<span class="source-line-no">033</span><span id="line-33">@InterfaceAudience.Private</span>
<span class="source-line-no">034</span><span id="line-34">public class CellArrayImmutableSegment extends ImmutableSegment {</span>
<span class="source-line-no">035</span><span id="line-35"></span>
<span class="source-line-no">036</span><span id="line-36"> public static final long DEEP_OVERHEAD_CAM = DEEP_OVERHEAD + ClassSize.CELL_ARRAY_MAP;</span>
<span class="source-line-no">037</span><span id="line-37"></span>
<span class="source-line-no">038</span><span id="line-38"> ///////////////////// CONSTRUCTORS /////////////////////</span>
<span class="source-line-no">039</span><span id="line-39"> /**</span>
<span class="source-line-no">040</span><span id="line-40"> * ------------------------------------------------------------------------ C-tor to be used when</span>
<span class="source-line-no">041</span><span id="line-41"> * new CellArrayImmutableSegment is a result of compaction of a list of older ImmutableSegments.</span>
<span class="source-line-no">042</span><span id="line-42"> * The given iterator returns the Cells that "survived" the compaction.</span>
<span class="source-line-no">043</span><span id="line-43"> */</span>
<span class="source-line-no">044</span><span id="line-44"> protected CellArrayImmutableSegment(CellComparator comparator, MemStoreSegmentsIterator iterator,</span>
<span class="source-line-no">045</span><span id="line-45"> MemStoreLAB memStoreLAB, int numOfCells, MemStoreCompactionStrategy.Action action) {</span>
<span class="source-line-no">046</span><span id="line-46"> super(null, comparator, memStoreLAB); // initiailize the CellSet with NULL</span>
<span class="source-line-no">047</span><span id="line-47"> incMemStoreSize(0, DEEP_OVERHEAD_CAM, 0, 0); // CAM is always on-heap</span>
<span class="source-line-no">048</span><span id="line-48"> // build the new CellSet based on CellArrayMap and update the CellSet of the new Segment</span>
<span class="source-line-no">049</span><span id="line-49"> initializeCellSet(numOfCells, iterator, action);</span>
<span class="source-line-no">050</span><span id="line-50"> }</span>
<span class="source-line-no">051</span><span id="line-51"></span>
<span class="source-line-no">052</span><span id="line-52"> /**</span>
<span class="source-line-no">053</span><span id="line-53"> * ------------------------------------------------------------------------ C-tor to be used when</span>
<span class="source-line-no">054</span><span id="line-54"> * new CellChunkImmutableSegment is built as a result of flattening of CSLMImmutableSegment The</span>
<span class="source-line-no">055</span><span id="line-55"> * given iterator returns the Cells that "survived" the compaction.</span>
<span class="source-line-no">056</span><span id="line-56"> */</span>
<span class="source-line-no">057</span><span id="line-57"> protected CellArrayImmutableSegment(CSLMImmutableSegment segment, MemStoreSizing mss,</span>
<span class="source-line-no">058</span><span id="line-58"> MemStoreCompactionStrategy.Action action) {</span>
<span class="source-line-no">059</span><span id="line-59"> super(segment); // initiailize the upper class</span>
<span class="source-line-no">060</span><span id="line-60"> long indexOverhead = DEEP_OVERHEAD_CAM - CSLMImmutableSegment.DEEP_OVERHEAD_CSLM;</span>
<span class="source-line-no">061</span><span id="line-61"> incMemStoreSize(0, indexOverhead, 0, 0); // CAM is always on-heap</span>
<span class="source-line-no">062</span><span id="line-62"> mss.incMemStoreSize(0, indexOverhead, 0, 0);</span>
<span class="source-line-no">063</span><span id="line-63"> int numOfCells = segment.getCellsCount();</span>
<span class="source-line-no">064</span><span id="line-64"> // build the new CellSet based on CellChunkMap and update the CellSet of this Segment</span>
<span class="source-line-no">065</span><span id="line-65"> reinitializeCellSet(numOfCells, segment.getScanner(Long.MAX_VALUE), segment.getCellSet(),</span>
<span class="source-line-no">066</span><span id="line-66"> action);</span>
<span class="source-line-no">067</span><span id="line-67"> // arrange the meta-data size, decrease all meta-data sizes related to SkipList;</span>
<span class="source-line-no">068</span><span id="line-68"> // add sizes of CellArrayMap entry (reinitializeCellSet doesn't take the care for the sizes)</span>
<span class="source-line-no">069</span><span id="line-69"> long newSegmentSizeDelta =</span>
<span class="source-line-no">070</span><span id="line-70"> numOfCells * (indexEntrySize() - ClassSize.CONCURRENT_SKIPLISTMAP_ENTRY);</span>
<span class="source-line-no">071</span><span id="line-71"> incMemStoreSize(0, newSegmentSizeDelta, 0, 0);</span>
<span class="source-line-no">072</span><span id="line-72"> mss.incMemStoreSize(0, newSegmentSizeDelta, 0, 0);</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"> @Override</span>
<span class="source-line-no">076</span><span id="line-76"> protected long indexEntrySize() {</span>
<span class="source-line-no">077</span><span id="line-77"> return ClassSize.CELL_ARRAY_MAP_ENTRY;</span>
<span class="source-line-no">078</span><span id="line-78"> }</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"> protected boolean canBeFlattened() {</span>
<span class="source-line-no">082</span><span id="line-82"> return false;</span>
<span class="source-line-no">083</span><span id="line-83"> }</span>
<span class="source-line-no">084</span><span id="line-84"></span>
<span class="source-line-no">085</span><span id="line-85"> ///////////////////// PRIVATE METHODS /////////////////////</span>
<span class="source-line-no">086</span><span id="line-86"> /*------------------------------------------------------------------------*/</span>
<span class="source-line-no">087</span><span id="line-87"> // Create CellSet based on CellArrayMap from compacting iterator</span>
<span class="source-line-no">088</span><span id="line-88"> private void initializeCellSet(int numOfCells, MemStoreSegmentsIterator iterator,</span>
<span class="source-line-no">089</span><span id="line-89"> MemStoreCompactionStrategy.Action action) {</span>
<span class="source-line-no">090</span><span id="line-90"> boolean merge = (action == MemStoreCompactionStrategy.Action.MERGE</span>
<span class="source-line-no">091</span><span id="line-91"> || action == MemStoreCompactionStrategy.Action.MERGE_COUNT_UNIQUE_KEYS);</span>
<span class="source-line-no">092</span><span id="line-92"> ExtendedCell[] cells = new ExtendedCell[numOfCells]; // build the Cell Array</span>
<span class="source-line-no">093</span><span id="line-93"> int i = 0;</span>
<span class="source-line-no">094</span><span id="line-94"> int numUniqueKeys = 0;</span>
<span class="source-line-no">095</span><span id="line-95"> Cell prev = null;</span>
<span class="source-line-no">096</span><span id="line-96"> while (iterator.hasNext()) {</span>
<span class="source-line-no">097</span><span id="line-97"> ExtendedCell c = iterator.next();</span>
<span class="source-line-no">098</span><span id="line-98"> // The scanner behind the iterator is doing all the elimination logic</span>
<span class="source-line-no">099</span><span id="line-99"> if (merge) {</span>
<span class="source-line-no">100</span><span id="line-100"> // if this is merge we just move the Cell object without copying MSLAB</span>
<span class="source-line-no">101</span><span id="line-101"> // the sizes still need to be updated in the new segment</span>
<span class="source-line-no">102</span><span id="line-102"> cells[i] = c;</span>
<span class="source-line-no">103</span><span id="line-103"> } else {</span>
<span class="source-line-no">104</span><span id="line-104"> // now we just copy it to the new segment (also MSLAB copy)</span>
<span class="source-line-no">105</span><span id="line-105"> cells[i] = maybeCloneWithAllocator(c, false);</span>
<span class="source-line-no">106</span><span id="line-106"> }</span>
<span class="source-line-no">107</span><span id="line-107"> // second parameter true, because in compaction/merge the addition of the cell to new segment</span>
<span class="source-line-no">108</span><span id="line-108"> // is always successful</span>
<span class="source-line-no">109</span><span id="line-109"> updateMetaInfo(cells[i], true, null); // updates the size per cell</span>
<span class="source-line-no">110</span><span id="line-110"> if (action == MemStoreCompactionStrategy.Action.MERGE_COUNT_UNIQUE_KEYS) {</span>
<span class="source-line-no">111</span><span id="line-111"> // counting number of unique keys</span>
<span class="source-line-no">112</span><span id="line-112"> if (prev != null) {</span>
<span class="source-line-no">113</span><span id="line-113"> if (!CellUtil.matchingRowColumnBytes(prev, c)) {</span>
<span class="source-line-no">114</span><span id="line-114"> numUniqueKeys++;</span>
<span class="source-line-no">115</span><span id="line-115"> }</span>
<span class="source-line-no">116</span><span id="line-116"> } else {</span>
<span class="source-line-no">117</span><span id="line-117"> numUniqueKeys++;</span>
<span class="source-line-no">118</span><span id="line-118"> }</span>
<span class="source-line-no">119</span><span id="line-119"> }</span>
<span class="source-line-no">120</span><span id="line-120"> prev = c;</span>
<span class="source-line-no">121</span><span id="line-121"> i++;</span>
<span class="source-line-no">122</span><span id="line-122"> }</span>
<span class="source-line-no">123</span><span id="line-123"> if (action == MemStoreCompactionStrategy.Action.COMPACT) {</span>
<span class="source-line-no">124</span><span id="line-124"> numUniqueKeys = numOfCells;</span>
<span class="source-line-no">125</span><span id="line-125"> } else if (action != MemStoreCompactionStrategy.Action.MERGE_COUNT_UNIQUE_KEYS) {</span>
<span class="source-line-no">126</span><span id="line-126"> numUniqueKeys = CellSet.UNKNOWN_NUM_UNIQUES;</span>
<span class="source-line-no">127</span><span id="line-127"> }</span>
<span class="source-line-no">128</span><span id="line-128"> // build the immutable CellSet</span>
<span class="source-line-no">129</span><span id="line-129"> CellArrayMap&lt;ExtendedCell&gt; cam = new CellArrayMap&lt;&gt;(getComparator(), cells, 0, i, false);</span>
<span class="source-line-no">130</span><span id="line-130"> this.setCellSet(null, new CellSet&lt;&gt;(cam, numUniqueKeys)); // update the CellSet of this Segment</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"> /*------------------------------------------------------------------------*/</span>
<span class="source-line-no">134</span><span id="line-134"> // Create CellSet based on CellChunkMap from current ConcurrentSkipListMap based CellSet</span>
<span class="source-line-no">135</span><span id="line-135"> // (without compacting iterator)</span>
<span class="source-line-no">136</span><span id="line-136"> // We do not consider cells bigger than chunks!</span>
<span class="source-line-no">137</span><span id="line-137"> private void reinitializeCellSet(int numOfCells, KeyValueScanner segmentScanner,</span>
<span class="source-line-no">138</span><span id="line-138"> CellSet&lt;ExtendedCell&gt; oldCellSet, MemStoreCompactionStrategy.Action action) {</span>
<span class="source-line-no">139</span><span id="line-139"> ExtendedCell[] cells = new ExtendedCell[numOfCells]; // build the Cell Array</span>
<span class="source-line-no">140</span><span id="line-140"> ExtendedCell curCell;</span>
<span class="source-line-no">141</span><span id="line-141"> int idx = 0;</span>
<span class="source-line-no">142</span><span id="line-142"> int numUniqueKeys = 0;</span>
<span class="source-line-no">143</span><span id="line-143"> ExtendedCell prev = null;</span>
<span class="source-line-no">144</span><span id="line-144"> try {</span>
<span class="source-line-no">145</span><span id="line-145"> while ((curCell = segmentScanner.next()) != null) {</span>
<span class="source-line-no">146</span><span id="line-146"> cells[idx++] = curCell;</span>
<span class="source-line-no">147</span><span id="line-147"> if (action == MemStoreCompactionStrategy.Action.FLATTEN_COUNT_UNIQUE_KEYS) {</span>
<span class="source-line-no">148</span><span id="line-148"> // counting number of unique keys</span>
<span class="source-line-no">149</span><span id="line-149"> if (prev != null) {</span>
<span class="source-line-no">150</span><span id="line-150"> if (!CellUtil.matchingRowColumn(prev, curCell)) {</span>
<span class="source-line-no">151</span><span id="line-151"> numUniqueKeys++;</span>
<span class="source-line-no">152</span><span id="line-152"> }</span>
<span class="source-line-no">153</span><span id="line-153"> } else {</span>
<span class="source-line-no">154</span><span id="line-154"> numUniqueKeys++;</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"> prev = curCell;</span>
<span class="source-line-no">158</span><span id="line-158"> }</span>
<span class="source-line-no">159</span><span id="line-159"> } catch (IOException ie) {</span>
<span class="source-line-no">160</span><span id="line-160"> throw new IllegalStateException(ie);</span>
<span class="source-line-no">161</span><span id="line-161"> } finally {</span>
<span class="source-line-no">162</span><span id="line-162"> segmentScanner.close();</span>
<span class="source-line-no">163</span><span id="line-163"> }</span>
<span class="source-line-no">164</span><span id="line-164"> if (action != MemStoreCompactionStrategy.Action.FLATTEN_COUNT_UNIQUE_KEYS) {</span>
<span class="source-line-no">165</span><span id="line-165"> numUniqueKeys = CellSet.UNKNOWN_NUM_UNIQUES;</span>
<span class="source-line-no">166</span><span id="line-166"> }</span>
<span class="source-line-no">167</span><span id="line-167"> // build the immutable CellSet</span>
<span class="source-line-no">168</span><span id="line-168"> CellArrayMap&lt;ExtendedCell&gt; cam = new CellArrayMap&lt;&gt;(getComparator(), cells, 0, idx, false);</span>
<span class="source-line-no">169</span><span id="line-169"> // update the CellSet of this Segment</span>
<span class="source-line-no">170</span><span id="line-170"> this.setCellSet(oldCellSet, new CellSet&lt;&gt;(cam, numUniqueKeys));</span>
<span class="source-line-no">171</span><span id="line-171"> }</span>
<span class="source-line-no">172</span><span id="line-172"></span>
<span class="source-line-no">173</span><span id="line-173">}</span>
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