Option 2: Clusters with Connection Manager and zero downtime during upgrade.
选项2：使用ConnectionManager且升级过程中零停机的集群。
It calls tcp_drop if the option is set and the linger time is zero.
如果设置了该选项，并且延迟时间为零，则调用tcp _ drop 。
If the option is not exercised, the cost of contingent options will be zero.
如果不行使权利，或有期权持有者的成本为零。
If the option is not exercised, the cost of contingent options will be zero.
如果不行使权利，或有期权持有者的成本为零。
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