Segmenting Data by Application or Customer按应用程序或客户划分数据

Disable the Balancer禁用平衡器

The balancer must be disabled on the collection to ensure no migrations take place while configuring the new zones.必须在集合上禁用平衡器，以确保在配置新区域时不会发生迁移。

Use sh.disableBalancing(), specifying the namespace of the collection, to stop the balancer.使用sh.disableBalancing()，指定集合的命名空间，以停止平衡器。

sh.disableBalancing("chat.message")

Use sh.isBalancerRunning() to check if the balancer process is currently running. 使用sh.isBalancerRunning()检查平衡器进程当前是否正在运行。Wait until any current balancing rounds have completed before proceeding.在继续之前，请等待所有当前平衡轮完成。

Add each shard to the appropriate zone将每个分片添加到相应的分区

Add shard0000 to the robot zone.将shard0000添加到robot区域。

sh.addShardTag("shard0000", "robot")

Add shard0001 to the robot zone.将shard0001添加到robot区域。

sh.addShardTag("shard0001", "robot")

Add shard0002 to the fruitos zone.将shard0002添加到fruitos区域。

sh.addShardTag("shard0002", "fruitos")

Add shard0003 to the fruitos zone.将shard0003添加到fruitos区域。

sh.addShardTag("shard0003", "fruitos")

Run sh.status() to review the zone configured for the sharded cluster.运行sh.status()查看为分片集群配置的区域。

Define ranges for each zone定义每个区域的范围

Define range for the robot client and associate it to the robot zone using the sh.addTagRange() method.定义robot客户端的范围，并使用sh.addTagRange()方法将其与robot区域关联。

This method requires:该方法要求：

• The full namespace of the target collection目标集合的完整命名空间
• The inclusive lower bound of the range范围的包含下限
• The exclusive upper bound of the range范围的唯一上界
• The name of the zone区域名称

sh.addTagRange(
  "gamify.users",
  { "client" : "robot", "userid" : MinKey },
  { "client" : "robot", "userid" : MaxKey }, 
  "robot"
)

Define range for the fruitos client and associate it to the fruitos zone using the sh.addTagRange() method.定义fruitos客户端的范围，并使用sh.addTagRange()方法将其与fruitos区域关联。

This method requires:该方法要求：

• The full namespace of the target collection目标集合的完整命名空间
• The inclusive lower bound of the range范围的包含下限
• The exclusive upper bound of the range范围的唯一上界
• The name of the zone区域名称

sh.addTagRange(
  "gamify.users",
  { "client" : "fruitos", "userid" : MinKey },
  { "client" : "fruitos", "userid" : MaxKey }, 
  "fruitos"
)

The MinKey and MaxKey values are reserved special values for comparisons. MinKey和MaxKey值是为比较保留的特殊值。MinKey always compares as lower than every other possible value, while 总是比其他可能的值低，而MaxKey always compares as higher than every other possible value. 总是比任何其他可能的值都高。The configured ranges captures every user for each client.配置的范围捕获每个client的每个用户。

Enable the Balancer启用平衡器

Re-enable the balancer to rebalance the cluster.重新启用平衡器以重新平衡群集。

Use sh.enableBalancing(), specifying the namespace of the collection, to start the balancer.使用sh.enableBalancing()，指定集合的命名空间，以启动平衡器。

sh.enableBalancing("chat.message")

Use sh.isBalancerRunning() to check if the balancer process is currently running.使用sh.isBalancerRunning()检查平衡器进程当前是否正在运行。

Review the changes回顾变化

The next time the balancer runs, it splits and migrates chunks across the shards respecting the configured zones.下一次运行平衡器时，它会根据配置的分区在分片之间分割和迁移块。

Once balancing finishes, the shards in the robot zone only contain documents with client : robot, while shards in the fruitos zone only contain documents with client : fruitos.平衡完成后，robot区域中的分片仅包含client : robot的文档，而fruitos区域中的片段仅包含client : fruitos的文档。

You can confirm the chunk distribution by running sh.status().您可以通过运行sh.status()来确认区块分布。