| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html lang="en"> |
| <head> |
| <title>Source code</title> |
| <link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> |
| </head> |
| <body> |
| <div class="sourceContainer"> |
| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Copyright The Apache Software Foundation<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> *<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * work for additional information regarding copyright ownership. The ASF<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * licenses this file to you under the Apache License, Version 2.0 (the<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance with the License.<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * You may obtain a copy of the License at<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> *<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * License for the specific language governing permissions and limitations<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.List;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span><a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.Cell;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.HConstants;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.PrivateCellUtil;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.regionserver.HRegion.RegionScannerImpl;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span><a name="line.32"></a> |
| <span class="sourceLineNo">033</span>/**<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * ReversibleRegionScannerImpl extends from RegionScannerImpl, and is used to<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * support reversed scanning.<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> */<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>@InterfaceAudience.Private<a name="line.37"></a> |
| <span class="sourceLineNo">038</span>class ReversedRegionScannerImpl extends RegionScannerImpl {<a name="line.38"></a> |
| <span class="sourceLineNo">039</span><a name="line.39"></a> |
| <span class="sourceLineNo">040</span> /**<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * @param scan<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * @param additionalScanners<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * @param region<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * @throws IOException<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> */<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> ReversedRegionScannerImpl(Scan scan, List<KeyValueScanner> additionalScanners, HRegion region)<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> throws IOException {<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> region.super(scan, additionalScanners, region);<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> }<a name="line.49"></a> |
| <span class="sourceLineNo">050</span><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> @Override<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> protected void initializeKVHeap(List<KeyValueScanner> scanners,<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> List<KeyValueScanner> joinedScanners, HRegion region) throws IOException {<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> this.storeHeap = new ReversedKeyValueHeap(scanners, comparator);<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> if (!joinedScanners.isEmpty()) {<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> throw new DoNotRetryIOException("Reverse scan with loading CFs on demand is not supported");<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> }<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> }<a name="line.58"></a> |
| <span class="sourceLineNo">059</span><a name="line.59"></a> |
| <span class="sourceLineNo">060</span> @Override<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> protected boolean shouldStop(Cell currentRowCell) {<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> if (currentRowCell == null) {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> return true;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> }<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> if (stopRow == null || Bytes.equals(stopRow, HConstants.EMPTY_START_ROW)) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> return false;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> }<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> int c = comparator.compareRows(currentRowCell, stopRow, 0, stopRow.length);<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> return c < 0 || (c == 0 && !includeStopRow);<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> }<a name="line.70"></a> |
| <span class="sourceLineNo">071</span><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> @Override<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> protected boolean nextRow(ScannerContext scannerContext, Cell curRowCell)<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> throws IOException {<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> assert super.joinedContinuationRow == null : "Trying to go to next row during joinedHeap read.";<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> this.storeHeap.seekToPreviousRow(PrivateCellUtil.createFirstOnRow(curRowCell));<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> resetFilters();<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> // Calling the hook in CP which allows it to do a fast forward<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> if (this.region.getCoprocessorHost() != null) {<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> return this.region.getCoprocessorHost().postScannerFilterRow(this, curRowCell);<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> }<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> return true;<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span><a name="line.84"></a> |
| <span class="sourceLineNo">085</span>}<a name="line.85"></a> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| </pre> |
| </div> |
| </body> |
| </html> |
