Upgrade to MongoDB Enterprise (Sharded Cluster)升级到MongoDB企业版（分片集群）

Disable the Balancer.禁用平衡器。

Connect mongosh to a mongos instance in the sharded cluster, and run sh.stopBalancer() to disable the balancer:将mongosh连接到分片集群中的mongos实例，并运行sh.stopBalancer()以禁用平衡器：

sh.stopBalancer()

To verify that the balancer is disabled, run sh.getBalancerState(), which returns false if the balancer is disabled:要验证平衡器是否已禁用，请运行sh.getBalancerState()，如果平衡器已禁用，则返回false：

sh.getBalancerState()

Starting in MongoDB 6.0.3, automatic chunk splitting is not performed. This is because of balancing policy improvements. Auto-splitting commands still exist, but do not perform an operation.从MongoDB 6.0.3开始，不执行自动块分割。这是因为平衡了政策的改进。自动拆分命令仍然存在，但不执行操作。

In MongoDB versions earlier than 6.0.3, sh.stopBalancer() also disables auto-splitting for the sharded cluster.在早于6.0.3的MongoDB版本中，sh.stopBalancer()还禁用了分片集群的自动拆分。

For more information on disabling the balancer, see Disable the Balancer.有关禁用平衡器的更多信息，请参阅禁用平衡器。

Upgrade the config servers.升级配置服务器。

1. Upgrade the secondary members of the replica set one at a time:一次升级一个副本集的secondary成员：

   1. Shut down the secondary mongod instance.关闭辅助mongod实例。
   2. Restart the member with the Enterprise mongod, specifying the same configuration options (e.g. same data directory, configuration file, etc.).使用Enterprise mongod重新启动成员，指定相同的配置选项（例如，相同的数据目录、配置文件等）。
   3. Wait for the member to recover to SECONDARY state before upgrading the next secondary member. 在升级下一个辅助成员之前，请等待成员恢复到SECONDARY状态。To check the member's state, issue rs.status() in mongosh.要检查成员的状态，请用mongosh发出rs.status()。

   Repeat for each remaining secondary member.对剩余的每个次要成员重复此操作。

2. Step down the replica set primary.逐步关闭主副本集。

   Connect mongosh to the primary and use rs.stepDown() to step down the primary and force an election of a new primary:将mongosh连接到初选，并使用rs.stepDown()退出初选并强制选举新的初选：

   rs.stepDown()

3. When rs.status() shows that the primary has stepped down and another member is primary, upgrade the stepped-down primary:当rs.status()显示主成员已降级，另一个成员为主成员时，升级降级的主成员：

   1. Shut down the stepped-down primary.关闭已降级的primary。
   2. Restart with the Enterprise mongod, specifying the same configuration options (e.g. same data directory, configuration file, etc.).使用Enterprise mongod重新启动，指定相同的配置选项（例如，相同的数据目录、配置文件等）。

Upgrade the shards.升级分片。

Upgrade the shards one at a time.一次升级一个分片。

For each shard replica set:对于每个分片副本集：

1. Upgrade the secondary members of the replica set one at a time:一次升级一个副本集的辅助成员：

   1. Shut down the secondary mongod instance.关闭辅助mongod实例。
   2. Restart the member with the Enterprise mongod, specifying the same configuration options (e.g. same data directory, configuration file, etc.).使用Enterprise mongod重新启动成员，指定相同的配置选项（例如，相同的数据目录、配置文件等）。
   3. Wait for the member to recover to SECONDARY state before upgrading the next secondary member. To check the member's state, issue rs.status() in mongosh.在升级下一个辅助成员之前，请等待成员恢复到SECONDARY状态。要检查成员的状态，请用mongosh发出rs.status()。

   Repeat for each remaining secondary member.对剩余的每个次要成员重复此操作。

2. Step down the replica set primary.逐步关闭主副本集。

   Connect mongosh to the primary and use rs.stepDown() to step down the primary and force an election of a new primary:将mongosh连接到初选，并使用rs.stepDown()退出初选并强制选举新的初选：

   rs.stepDown()

3. When rs.status() shows that the primary has stepped down and another member is primary, upgrade the stepped-down primary:当rs.status()显示主成员已降级，另一个成员为主成员时，升级降级的主成员：

   1. Shut down the stepped-down primary.关闭已降级的primary。
   2. Restart with the Enterprise mongod, specifying the same configuration options (e.g. same data directory, configuration file, etc.).使用Enterprise mongod重新启动，指定相同的配置选项（例如，相同的数据目录、配置文件等）。

Upgrade the mongos instances.升级mongos实例。

For each mongos instance, shutdown mongos and restart with the Enterprise mongos, specifying the same configuration options.对于每个mongos实例，关闭mongos并使用Enterprise mongos重新启动，指定相同的配置选项。

Re-enable the balancer.重新启用平衡器。

Using mongosh, connect to a mongos in the cluster and run sh.startBalancer() to re-enable the balancer:使用mongosh，连接到集群中的mongos并运行sh.startBalancer()以重新启用平衡器：

sh.startBalancer()

Starting in MongoDB 6.0.3, automatic chunk splitting is not performed. This is because of balancing policy improvements. Auto-splitting commands still exist, but do not perform an operation.从MongoDB 6.0.3开始，不执行自动块分割。这是因为平衡了政策的改进。自动拆分命令仍然存在，但不执行操作。

In MongoDB versions earlier than 6.0.3, sh.startBalancer() also enables auto-splitting for the sharded cluster.在早于6.0.3的MongoDB版本中，sh.startBalancer()还启用了分片集群的自动拆分。

For more inforamtion on the balancer, see Enable the Balancer.有关平衡器的更多信息，请参阅启用平衡器。