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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.mob;</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.Closeable;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.io.IOException;</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.ExtendedCell;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.regionserver.StoreFileScanner;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">026</span><span id="line-26"></span> |
| <span class="source-line-no">027</span><span id="line-27">/**</span> |
| <span class="source-line-no">028</span><span id="line-28"> * The MobCell will maintain a {@link Cell} and a {@link StoreFileScanner} inside. Now, the mob cell</span> |
| <span class="source-line-no">029</span><span id="line-29"> * is backend by NIO ByteBuffers which are allocated from ByteBuffAllocator, so we cannot just read</span> |
| <span class="source-line-no">030</span><span id="line-30"> * the cell and close the MOB file scanner because the MOB file scanner closing will deallocate the</span> |
| <span class="source-line-no">031</span><span id="line-31"> * NIO ByteBuffers, which resulting memory leak.</span> |
| <span class="source-line-no">032</span><span id="line-32"> * <p></span> |
| <span class="source-line-no">033</span><span id="line-33"> * Actually, the right solution is: <br></span> |
| <span class="source-line-no">034</span><span id="line-34"> * 1. Read the normal cell; <br></span> |
| <span class="source-line-no">035</span><span id="line-35"> * 2. Parse the value of normal cell and get MOB fileName,offset,length; <br></span> |
| <span class="source-line-no">036</span><span id="line-36"> * 3. Open scanner to read the mob value; <br></span> |
| <span class="source-line-no">037</span><span id="line-37"> * 4. Construct the response cell whose key is from the normal cell and value is from the mob cell.</span> |
| <span class="source-line-no">038</span><span id="line-38"> * <br></span> |
| <span class="source-line-no">039</span><span id="line-39"> * 5. Ship the response cell to HBase client. <br></span> |
| <span class="source-line-no">040</span><span id="line-40"> * 6. Release both normal cell's block and mob cell's block. <br></span> |
| <span class="source-line-no">041</span><span id="line-41"> * <p></span> |
| <span class="source-line-no">042</span><span id="line-42"> * For mob cell, the block releasing just means closing the the mob scanner, so here we need to keep</span> |
| <span class="source-line-no">043</span><span id="line-43"> * the {@link StoreFileScanner} inside and close only when we're ensure that the MobCell has been</span> |
| <span class="source-line-no">044</span><span id="line-44"> * shipped to RPC client.</span> |
| <span class="source-line-no">045</span><span id="line-45"> */</span> |
| <span class="source-line-no">046</span><span id="line-46">@InterfaceAudience.Private</span> |
| <span class="source-line-no">047</span><span id="line-47">public class MobCell implements Closeable {</span> |
| <span class="source-line-no">048</span><span id="line-48"></span> |
| <span class="source-line-no">049</span><span id="line-49"> private final ExtendedCell cell;</span> |
| <span class="source-line-no">050</span><span id="line-50"> private final StoreFileScanner sfScanner;</span> |
| <span class="source-line-no">051</span><span id="line-51"></span> |
| <span class="source-line-no">052</span><span id="line-52"> public MobCell(ExtendedCell cell) {</span> |
| <span class="source-line-no">053</span><span id="line-53"> this.cell = cell;</span> |
| <span class="source-line-no">054</span><span id="line-54"> this.sfScanner = 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"></span> |
| <span class="source-line-no">057</span><span id="line-57"> public MobCell(ExtendedCell cell, StoreFileScanner sfScanner) {</span> |
| <span class="source-line-no">058</span><span id="line-58"> this.cell = cell;</span> |
| <span class="source-line-no">059</span><span id="line-59"> this.sfScanner = sfScanner;</span> |
| <span class="source-line-no">060</span><span id="line-60"> }</span> |
| <span class="source-line-no">061</span><span id="line-61"></span> |
| <span class="source-line-no">062</span><span id="line-62"> public ExtendedCell getCell() {</span> |
| <span class="source-line-no">063</span><span id="line-63"> return cell;</span> |
| <span class="source-line-no">064</span><span id="line-64"> }</span> |
| <span class="source-line-no">065</span><span id="line-65"></span> |
| <span class="source-line-no">066</span><span id="line-66"> @Override</span> |
| <span class="source-line-no">067</span><span id="line-67"> public void close() throws IOException {</span> |
| <span class="source-line-no">068</span><span id="line-68"> if (this.sfScanner != null) {</span> |
| <span class="source-line-no">069</span><span id="line-69"> this.sfScanner.close();</span> |
| <span class="source-line-no">070</span><span id="line-70"> }</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72">}</span> |
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