The updates are then propagated to the slave servers.
这些更新然后会传播到从服务器上。
Indexing commands are sent to the master server and queries are sent to the slave servers.
索引命令发送到主服务器，查询则发送到从服务器。
There are threads for handling synchronization of master and slave servers for replication.
一些线程用于处理主从服务器的同步，以便执行复制。
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