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Mongos often go DOWN.

 May 12, 2019   mongodb, question

Two slices of 600G data, version 2.41
Mongos has two running on DELL R420 64G memory
Usually the disk IO is about 8M
However, before mongos hangs up, the disk IO is generally about 30M, and mongos does not have any error logs
DOWN time, on average once a week, not during the peak period.
I don’t know if you have encountered such a situation.

2.43 No, upgrade it

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<< How does mongodb aggregate the List type fields of each document and return them as a whole? Mongo shard is experiencing a problem with its expansion-the new shard is written with very little data and move chunk is very slow >>

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