Docs 菜单

replSetMaintenance

replSetMaintenance

The replSetMaintenance admin command enables or disables the maintenance mode for a 从节点 member of a 复制集.

此命令可用于以下环境中托管的部署:

重要

M 0 、M 2 、M 5和 M 10 + 集群不支持此命令。 有关更多信息,请参阅不支持的命令。

该命令具有以下语法:

db.runCommand(
{
replSetMaintenance: <boolean>
}
)

Consider the following behavior when running the replSetMaintenance command:

  • You cannot run the command on the Primary.

  • You must run the command against the admin database.

  • When enabled replSetMaintenance: true, the member enters the RECOVERING state. While the secondary is RECOVERING:

    • The member is not accessible for read operations.

    • The member continues to sync its oplog from the Primary.

  • When a node receives a replSetMaintenance: true request, it adds a maintenance mode task to a queue of tasks. If the queue of tasks was empty and now is not, the node will transition to RECOVERING state and begin to reject read requests. When a node receives a replSetMaintenance: false request, it removes a maintenance mode task from the queue (even if that task was initiated by a different client). If the request empties the maintenance mode task queue, the node will return to SECONDARY state.

  • If you want to prevent a node from servicing reads, consider using 隐藏的副本集成员 instead.