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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.mob;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.io.Closeable;<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 org.apache.hadoop.hbase.Cell;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.ExtendedCell;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.regionserver.StoreFileScanner;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span><a name="line.26"></a> |
| <span class="sourceLineNo">027</span>/**<a name="line.27"></a> |
| <span class="sourceLineNo">028</span> * The MobCell will maintain a {@link Cell} and a {@link StoreFileScanner} inside. Now, the mob cell<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * is backend by NIO ByteBuffers which are allocated from ByteBuffAllocator, so we cannot just read<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * the cell and close the MOB file scanner because the MOB file scanner closing will deallocate the<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * NIO ByteBuffers, which resulting memory leak.<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * <p><a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * Actually, the right solution is: <br><a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * 1. Read the normal cell; <br><a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * 2. Parse the value of normal cell and get MOB fileName,offset,length; <br><a name="line.35"></a> |
| <span class="sourceLineNo">036</span> * 3. Open scanner to read the mob value; <br><a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * 4. Construct the response cell whose key is from the normal cell and value is from the mob cell.<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * <br><a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * 5. Ship the response cell to HBase client. <br><a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * 6. Release both normal cell's block and mob cell's block. <br><a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * <p><a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * For mob cell, the block releasing just means closing the the mob scanner, so here we need to keep<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * the {@link StoreFileScanner} inside and close only when we're ensure that the MobCell has been<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * shipped to RPC client.<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> */<a name="line.45"></a> |
| <span class="sourceLineNo">046</span>@InterfaceAudience.Private<a name="line.46"></a> |
| <span class="sourceLineNo">047</span>public class MobCell implements Closeable {<a name="line.47"></a> |
| <span class="sourceLineNo">048</span><a name="line.48"></a> |
| <span class="sourceLineNo">049</span> private final ExtendedCell cell;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> private final StoreFileScanner sfScanner;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span><a name="line.51"></a> |
| <span class="sourceLineNo">052</span> public MobCell(ExtendedCell cell) {<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> this.cell = cell;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> this.sfScanner = null;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> }<a name="line.55"></a> |
| <span class="sourceLineNo">056</span><a name="line.56"></a> |
| <span class="sourceLineNo">057</span> public MobCell(ExtendedCell cell, StoreFileScanner sfScanner) {<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> this.cell = cell;<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> this.sfScanner = sfScanner;<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> }<a name="line.60"></a> |
| <span class="sourceLineNo">061</span><a name="line.61"></a> |
| <span class="sourceLineNo">062</span> public ExtendedCell getCell() {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> return cell;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> }<a name="line.64"></a> |
| <span class="sourceLineNo">065</span><a name="line.65"></a> |
| <span class="sourceLineNo">066</span> @Override<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> public void close() throws IOException {<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> if (this.sfScanner != null) {<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> this.sfScanner.close();<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>}<a name="line.72"></a> |
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