错误，没有为方法加上同步限制。

Error, no synchronization on method.

youdao

如果没有适当地安排服务器的大小，当更新活动比较频繁时，集群复制维护数据库同步的能力就会受到限制。

When update activity is excessive, the ability of cluster replication to maintain database synchronization becomes limited if the server is not sized properly.

youdao

同步块被限制在一个JVM上，请求被路由到集群中的另一个节点并引起接收节点中的并发异常，这种可能性仍然存在。

The synchronization block was limited to one JVM and a possibility still existed that a request is routed to another node in a cluster and causes the concurrency exception in the receiving node.

youdao