Shulou(Shulou.com)06/01 Report--

Mongodb cluster is used to store the information about the execution and call of the interface. The cluster is divided into two shard01,shard02, and each shard has one primary node and two slave nodes.

Back up the sharded data on mongos and back up once a day. After the backup is completed, empty the data, re-establish the collection and create the sharding index. The result is as follows:

The collection on shard01 creates a sharding index, but no sharding index is created on shard02, resulting in chunk being distributed only on shard01 shards.

Specific error message:

Errmsg: "aborting migration, shard is missing 1 indexes and collection is not empty. Non-trivial index creation should be scheduled manually"

Later, chunk began to migrate after shard02 manually created the sharding index, which did not successfully create the sharding index. Technicians from mongo manufacturers also asked this question when they came to the company for training, but did not say why.

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