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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.client;</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 org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">021</span><span id="line-21"></span> |
| <span class="source-line-no">022</span><span id="line-22">/**</span> |
| <span class="source-line-no">023</span><span id="line-23"> * Consistency defines the expected consistency level for an operation.</span> |
| <span class="source-line-no">024</span><span id="line-24"> */</span> |
| <span class="source-line-no">025</span><span id="line-25">@InterfaceAudience.Public</span> |
| <span class="source-line-no">026</span><span id="line-26">public enum Consistency {</span> |
| <span class="source-line-no">027</span><span id="line-27"> // developer note: Do not reorder. Client.proto#Consistency depends on this order</span> |
| <span class="source-line-no">028</span><span id="line-28"> /**</span> |
| <span class="source-line-no">029</span><span id="line-29"> * Strong consistency is the default consistency model in HBase, where reads and writes go through</span> |
| <span class="source-line-no">030</span><span id="line-30"> * a single server which serializes the updates, and returns all data that was written and ack'd.</span> |
| <span class="source-line-no">031</span><span id="line-31"> */</span> |
| <span class="source-line-no">032</span><span id="line-32"> STRONG,</span> |
| <span class="source-line-no">033</span><span id="line-33"></span> |
| <span class="source-line-no">034</span><span id="line-34"> /**</span> |
| <span class="source-line-no">035</span><span id="line-35"> * Timeline consistent reads might return values that may not see the most recent updates. Write</span> |
| <span class="source-line-no">036</span><span id="line-36"> * transactions are always performed in strong consistency model in HBase which guarantees that</span> |
| <span class="source-line-no">037</span><span id="line-37"> * transactions are ordered, and replayed in the same order by all copies of the data. In timeline</span> |
| <span class="source-line-no">038</span><span id="line-38"> * consistency, the get and scan requests can be answered from data that may be stale. <br></span> |
| <span class="source-line-no">039</span><span id="line-39"> * The client may still observe transactions out of order if the requests are responded from</span> |
| <span class="source-line-no">040</span><span id="line-40"> * different servers.</span> |
| <span class="source-line-no">041</span><span id="line-41"> */</span> |
| <span class="source-line-no">042</span><span id="line-42"> TIMELINE,</span> |
| <span class="source-line-no">043</span><span id="line-43">}</span> |
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