https://linzeyan.github.io/categories/ha/Recent content in HA on RickyHugo -- gohugo.ioenTue, 18 Apr 2023 10:24:00 +0800https://linzeyan.github.io/posts/2023/20230418-high-availability-system/Tue, 18 Apr 2023 10:24:00 +0800https://linzeyan.github.io/posts/2023/20230418-high-availability-system/<ul> <li><a href="https://coolshell.cn/articles/17459.html" target="_blank" rel="noopener">On High Availability Systems</a></li> </ul> <table> <thead> <tr> <th>Item / Mechanism</th> <th>Backups</th> <th>M/S</th> <th>MM</th> <th>2PC</th> <th>Paxos</th> </tr> </thead> <tbody> <tr> <td>Consistency</td> <td>Weak</td> <td>Eventual</td> <td>Eventual</td> <td>Strong</td> <td>Strong</td> </tr> <tr> <td>Transactions</td> <td>No</td> <td>Full</td> <td>Local</td> <td>Full</td> <td>Full</td> </tr> <tr> <td>Latency</td> <td>Low</td> <td>Low</td> <td>Low</td> <td>High</td> <td>High</td> </tr> <tr> <td>Throughput</td> <td>High</td> <td>High</td> <td>High</td> <td>Low</td> <td>Medium</td> </tr> <tr> <td>Data loss</td> <td>Lots</td> <td>Some</td> <td>Some</td> <td>None</td> <td>None</td> </tr> <tr> <td>Failover</td> <td>Down</td> <td>Read only</td> <td>Read only</td> <td>Read/write</td> <td>Read/write</td> </tr> </tbody> </table> <p>This table essentially covers the foundational solutions for high-availability systems today. M/S and MM are not hard to implement, but have many issues. 2PC suffers from poor performance, while Paxos is too complex and difficult to implement.</p>