Distribute Collections Using Zones使用区域分发集合

Add each shard to the appropriate zone.将每个分片添加到适当的区域。

To configure the shards in each zone, use the addShardToZone command.要配置每个区域中的分片，请使用addShardToZone命令。

Add shard0 and shard2 to the HI_RAM zone:将shard0和shard2添加到HI_RAM区域：

sh.addShardToZone("shard0", "HI_RAM")

sh.addShardToZone("shard2", "HI_RAM")

Add shard1 and shard2 to the FLASH zone:将shard1和shard2添加到FLASH区域：

sh.addShardToZone("shard1", "FLASH")

sh.addShardToZone("shard2", "FLASH")

Add zone ranges for the relevant collections.为相关集合添加区域范围。

To associate a range of shard keys to a zone, use sh.updateZoneKeyRange().要将一系列分片键与区域相关联，请使用sh.updateZoneKeyRange()。

In this scenario, you want to associate all documents in a collection to the appropriate zone. To associate all collection documents to a zone, specify the following zone range:在这种情况下，您希望将集合中的所有文档关联到相应的区域。要将所有集合文档关联到一个区域，请指定以下区域范围：

• a lower bound of { "_id" : MinKey }的下界
• an upper bound of { "_id" : MaxKey }的上界

For the bigData collection, set:对于bigData集合，设置：

• The namespace to shardDistributionDB.bigData,命名空间为shardDistributionDB.bigData，
• The lower bound to MinKey,MinKey的下限，
• The upper bound to MaxKey,MaxKey的上限，
• The zone to 区域为FLASH

sh.updateZoneKeyRange(
   "shardDistributionDB.bigData",
   { "_id" : MinKey },
   { "_id" : MaxKey },
   "FLASH"
)

For the manyIndexes collection, set:对于manyIndexes集合，设置：

• The namespace to shardDistributionDB.manyIndexes,命名空间为shardDistributionDBmanyIndexes，
• The lower bound to MinKey,MinKey的下界，
• The upper bound to MaxKey,MaxKey的上界，
• The zone to HI_RAM区域为HI_RAM

sh.updateZoneKeyRange(
   "shardDistributionDB.manyIndexes",
   { "_id" : MinKey },
   { "_id" : MaxKey },
   "HI_RAM"
)

Shard the collections.把集合品分成分片。

To shard both collections (bigData and manyIndexes), specify a shard key of { _id: "hashed" }.要对两个集合（bigData和manyIndexes）进行分片，请指定一个分片键{ _id: "hashed" }。

Run the following commands:运行以下命令：

sh.shardCollection(
   "shardDistributionDB.bigData", { _id: "hashed" }
)

sh.shardCollection(
   "shardDistributionDB.manyIndexes", { _id: "hashed" }
)

Review the changes.查看更改。

To view chunk distribution and shard zones, use the sh.status() method:要查看块分布和分片区域，请使用sh.status()方法：

sh.status()

The next time the balancer runs, it splits chunks where necessary and migrates chunks across the shards, respecting the configured zones. 下次平衡器运行时，它会在必要时分割块，并在分片之间迁移块，同时尊重配置的区域。The amount of time the balancer takes to complete depends on several factors, including number of shards, available memory, and IOPS.平衡器完成所需的时间取决于几个因素，包括分片数量、可用内存和IOPS。

When balancing finishes:平衡完成后：

• Chunks for documents in the manyIndexes collection reside on shard0 and shard2manyIndexes集合中的文档块位于shard0和shard2上
• Chunks for documents in the bigData collection reside on shard1 and shard2.bigData集合中的文档块位于shard1和shard2上。