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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> *<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * 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<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * with the License. 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,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * limitations 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;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span><a name="line.22"></a> |
| <span class="sourceLineNo">023</span>/**<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> * Enum describing all possible memory compaction policies<a name="line.24"></a> |
| <span class="sourceLineNo">025</span> */<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>@InterfaceAudience.Public<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>public enum MemoryCompactionPolicy {<a name="line.27"></a> |
| <span class="sourceLineNo">028</span> /**<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * No memory compaction, when size threshold is exceeded data is flushed to disk<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> */<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> NONE,<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> /**<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * Basic policy applies optimizations which modify the index to a more compacted representation.<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * This is beneficial in all access patterns. The smaller the cells are the greater the<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * benefit of this policy.<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> * This is the default policy.<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> */<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> BASIC,<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> /**<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * In addition to compacting the index representation as the basic policy, eager policy<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * eliminates duplication while the data is still in memory (much like the<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * on-disk compaction does after the data is flushed to disk). This policy is most useful for<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * applications with high data churn or small working sets.<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> */<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> EAGER,<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> /**<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> * Adaptive compaction adapts to the workload. It applies either index compaction or data<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> * compaction based on the ratio of duplicate cells in the data.<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> */<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> ADAPTIVE<a name="line.50"></a> |
| <span class="sourceLineNo">051</span><a name="line.51"></a> |
| <span class="sourceLineNo">052</span>}<a name="line.52"></a> |
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