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

Question one

The sharding configuration is completely correct, the mongos service can be started normally, and the selection of shard keys is reasonable (previously tested locally), but the data is always concentrated on one shard?

In the final resolution process, the following error is prompted after logging in with mongo on a sharding server:

When prompted, change the kernel parameter to 0 and execute the following command:

Echo 0 > / proc/sys/vm/zone_reclaim_mode

Then service mongod restart restarts the mongod service, and the data is automatically balanced into each shard, as shown in the figure:

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