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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.wal;</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 static org.apache.hadoop.hbase.util.ConcurrentMapUtils.computeIfAbsent;</span> |
| <span class="source-line-no">021</span><span id="line-21"></span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.concurrent.ConcurrentHashMap;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.concurrent.atomic.AtomicInteger;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.wal.RegionGroupingProvider.RegionGroupingStrategy;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">028</span><span id="line-28"></span> |
| <span class="source-line-no">029</span><span id="line-29">/**</span> |
| <span class="source-line-no">030</span><span id="line-30"> * A WAL grouping strategy that limits the number of wal groups to</span> |
| <span class="source-line-no">031</span><span id="line-31"> * "hbase.wal.regiongrouping.numgroups".</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 BoundedGroupingStrategy implements RegionGroupingStrategy {</span> |
| <span class="source-line-no">035</span><span id="line-35"></span> |
| <span class="source-line-no">036</span><span id="line-36"> static final String NUM_REGION_GROUPS = "hbase.wal.regiongrouping.numgroups";</span> |
| <span class="source-line-no">037</span><span id="line-37"> static final int DEFAULT_NUM_REGION_GROUPS = 2;</span> |
| <span class="source-line-no">038</span><span id="line-38"></span> |
| <span class="source-line-no">039</span><span id="line-39"> private ConcurrentHashMap<String, String> groupNameCache = new ConcurrentHashMap<>();</span> |
| <span class="source-line-no">040</span><span id="line-40"> private AtomicInteger counter = new AtomicInteger(0);</span> |
| <span class="source-line-no">041</span><span id="line-41"> private String[] groupNames;</span> |
| <span class="source-line-no">042</span><span id="line-42"></span> |
| <span class="source-line-no">043</span><span id="line-43"> @Override</span> |
| <span class="source-line-no">044</span><span id="line-44"> public String group(byte[] identifier, byte[] namespace) {</span> |
| <span class="source-line-no">045</span><span id="line-45"> String idStr = Bytes.toString(identifier);</span> |
| <span class="source-line-no">046</span><span id="line-46"> return computeIfAbsent(groupNameCache, idStr,</span> |
| <span class="source-line-no">047</span><span id="line-47"> () -> groupNames[getAndIncrAtomicInteger(counter, groupNames.length)]);</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"> // Non-blocking incrementing & resetting of AtomicInteger.</span> |
| <span class="source-line-no">051</span><span id="line-51"> private int getAndIncrAtomicInteger(AtomicInteger atomicInt, int reset) {</span> |
| <span class="source-line-no">052</span><span id="line-52"> for (;;) {</span> |
| <span class="source-line-no">053</span><span id="line-53"> int current = atomicInt.get();</span> |
| <span class="source-line-no">054</span><span id="line-54"> int next = (current + 1);</span> |
| <span class="source-line-no">055</span><span id="line-55"> if (next == reset) {</span> |
| <span class="source-line-no">056</span><span id="line-56"> next = 0;</span> |
| <span class="source-line-no">057</span><span id="line-57"> }</span> |
| <span class="source-line-no">058</span><span id="line-58"> if (atomicInt.compareAndSet(current, next)) return current;</span> |
| <span class="source-line-no">059</span><span id="line-59"> }</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"> @Override</span> |
| <span class="source-line-no">063</span><span id="line-63"> public void init(Configuration config, String providerId) {</span> |
| <span class="source-line-no">064</span><span id="line-64"> int regionGroupNumber = config.getInt(NUM_REGION_GROUPS, DEFAULT_NUM_REGION_GROUPS);</span> |
| <span class="source-line-no">065</span><span id="line-65"> groupNames = new String[regionGroupNumber];</span> |
| <span class="source-line-no">066</span><span id="line-66"> for (int i = 0; i < regionGroupNumber; i++) {</span> |
| <span class="source-line-no">067</span><span id="line-67"> groupNames[i] = providerId + GROUP_NAME_DELIMITER + "regiongroup-" + i;</span> |
| <span class="source-line-no">068</span><span id="line-68"> }</span> |
| <span class="source-line-no">069</span><span id="line-69"> }</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> |
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