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  1. Core Server
  2. SERVER-42723

New shard with new database can be ignored by change streams

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    • Query 2019-08-26, Query 2019-09-09, Query 2019-09-23, Query 2019-10-07, Query 2019-10-21, Query 2019-11-04
    • 49

    Description

      We think it is possible to add a shard, create a new database on that shard, and then create one or more unsharded collections on that shard without a change stream noticing that the shard exists.

      The execution machinery uses an oplog entry indicating a migration to detect that a new shard has been added. But in the scenario above there may be no information in any of the shards' oplogs to indicate that a new shard exists.

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              bernard.gorman@mongodb.com Bernard Gorman
              charlie.swanson@mongodb.com Charlie Swanson
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