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<p>By default, four master nodes and four subordinate nodes are deployed in a Redis Cluster in the same availability zone of the same region. When the data volume in a Redis cluster increases and requires horizontal scaling, the cluster will expand the number of master and subordinate nodes based on the upgraded memory specification. Master nodes are the default access nodes and support data reading and writing. Each master node in the cluster stores part of the sharded data.</p> <p>Each cluster node uses a hot backup architecture. Each master node has one subordinate node. The data on the master node is synchronized to its subordinate node. When a master node fails, its subordinate node takes over the service in seconds to ensure service continuity. In addition, the Redis Cluster can persist data to the disk to ensure high reliability by using the RDB and AOF persistence policies.</p> <p><span style="font-size:18px"><strong>Architecture&nbsp;</strong></span></p> <p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20203007091600-1b55aa9793a1.png" style="height:505px; width:695px" /></p> <p><strong>&nbsp;&nbsp;</strong></p>
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