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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 java.util.List;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.hbase.Cell;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.hbase.DoNotRetryIOException;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.HConstants;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.PrivateCellUtil;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.client.Scan;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">029</span><span id="line-29"></span> |
| <span class="source-line-no">030</span><span id="line-30">/**</span> |
| <span class="source-line-no">031</span><span id="line-31"> * ReversibleRegionScannerImpl extends from RegionScannerImpl, and is used to support reversed</span> |
| <span class="source-line-no">032</span><span id="line-32"> * scanning.</span> |
| <span class="source-line-no">033</span><span id="line-33"> */</span> |
| <span class="source-line-no">034</span><span id="line-34">@InterfaceAudience.Private</span> |
| <span class="source-line-no">035</span><span id="line-35">class ReversedRegionScannerImpl extends RegionScannerImpl {</span> |
| <span class="source-line-no">036</span><span id="line-36"></span> |
| <span class="source-line-no">037</span><span id="line-37"> ReversedRegionScannerImpl(Scan scan, List<KeyValueScanner> additionalScanners, HRegion region,</span> |
| <span class="source-line-no">038</span><span id="line-38"> long nonceGroup, long nonce) throws IOException {</span> |
| <span class="source-line-no">039</span><span id="line-39"> super(scan, additionalScanners, region, nonceGroup, nonce);</span> |
| <span class="source-line-no">040</span><span id="line-40"> }</span> |
| <span class="source-line-no">041</span><span id="line-41"></span> |
| <span class="source-line-no">042</span><span id="line-42"> @Override</span> |
| <span class="source-line-no">043</span><span id="line-43"> protected void initializeKVHeap(List<KeyValueScanner> scanners,</span> |
| <span class="source-line-no">044</span><span id="line-44"> List<KeyValueScanner> joinedScanners, HRegion region) throws IOException {</span> |
| <span class="source-line-no">045</span><span id="line-45"> this.storeHeap = new ReversedKeyValueHeap(scanners, comparator);</span> |
| <span class="source-line-no">046</span><span id="line-46"> if (!joinedScanners.isEmpty()) {</span> |
| <span class="source-line-no">047</span><span id="line-47"> throw new DoNotRetryIOException("Reverse scan with loading CFs on demand is not supported");</span> |
| <span class="source-line-no">048</span><span id="line-48"> }</span> |
| <span class="source-line-no">049</span><span id="line-49"> }</span> |
| <span class="source-line-no">050</span><span id="line-50"></span> |
| <span class="source-line-no">051</span><span id="line-51"> @Override</span> |
| <span class="source-line-no">052</span><span id="line-52"> protected boolean shouldStop(Cell currentRowCell) {</span> |
| <span class="source-line-no">053</span><span id="line-53"> if (currentRowCell == null) {</span> |
| <span class="source-line-no">054</span><span id="line-54"> return true;</span> |
| <span class="source-line-no">055</span><span id="line-55"> }</span> |
| <span class="source-line-no">056</span><span id="line-56"> if (stopRow == null || Bytes.equals(stopRow, HConstants.EMPTY_START_ROW)) {</span> |
| <span class="source-line-no">057</span><span id="line-57"> return 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"> int c = comparator.compareRows(currentRowCell, stopRow, 0, stopRow.length);</span> |
| <span class="source-line-no">060</span><span id="line-60"> return c < 0 || (c == 0 && !includeStopRow);</span> |
| <span class="source-line-no">061</span><span id="line-61"> }</span> |
| <span class="source-line-no">062</span><span id="line-62"></span> |
| <span class="source-line-no">063</span><span id="line-63"> @Override</span> |
| <span class="source-line-no">064</span><span id="line-64"> protected boolean nextRow(ScannerContext scannerContext, Cell curRowCell) throws IOException {</span> |
| <span class="source-line-no">065</span><span id="line-65"> assert super.joinedContinuationRow == null : "Trying to go to next row during joinedHeap read.";</span> |
| <span class="source-line-no">066</span><span id="line-66"> this.storeHeap.seekToPreviousRow(PrivateCellUtil.createFirstOnRow(curRowCell));</span> |
| <span class="source-line-no">067</span><span id="line-67"> resetFilters();</span> |
| <span class="source-line-no">068</span><span id="line-68"> // Calling the hook in CP which allows it to do a fast forward</span> |
| <span class="source-line-no">069</span><span id="line-69"> if (this.region.getCoprocessorHost() != null) {</span> |
| <span class="source-line-no">070</span><span id="line-70"> return this.region.getCoprocessorHost().postScannerFilterRow(this, curRowCell);</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"> return true;</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> |
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