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Redis组从同步.html
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<div class="page-header"><h1>Redis组从同步</h1></div>
<div class="well small">Permalink: <a class="more" href="/Redis组从同步.html">1000-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/redis.html">Redis</a>
tags: <a href="/tag/redis.html">Redis</a> </div>
<div><h5>主从同步的构架</h5>
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<li>只有一台主机服务，只负责写入数据，不负责读取数据</li>
<li>多台从服务器，不负责写入数据，只负责同步主服务器的数据，供外部程序读取</li>
<li>主服务器写入数据后，将命令发送到从服务器上，使主从同步</li>
<li>应用程序可以读取某一台服务器的数据，负载均衡</li>
<li>当某些服务器瘫痪时，系统影响不大，选举出一台从服务器当做主服务器</li>
</ul>
<h5>2 增量同步</h5>
<p>Redis增量复制是指Slave初始化后开始正常工作时主服务器发生的写操作同步到从服务器的过程。 </p>
<p>增量复制的过程主要是主服务器每执行一个写命令就会向从服务器发送相同的写命令，从服务器接收并执行收到的写命令。</p>
<h5>3 Redis主从同步策略</h5>
<p>主从刚刚连接的时候，进行全量同步；全同步结束后，进行增量同步。当然，如果有需要，slave 在任何时候都可以发起全量同步。redis 策略是，无论如何，首先会尝试进行增量同步，如不成功，要求从机进行全量同步</p></div>
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