Please note that by setting a custom field in the collection’s
block_compressor setting, this setting will be permanently set on the
collection and cannot be overridden.
Is there a possibility to do that on a secondary without having to resync
the whole DB?
It is possible to mix different storage engines in a replica set, but it
is currently not possible (as of MongoDB 3.2) to set different storage
engine *options* for a collection in a replica set. I.e., if you
custom-specify a collection to use no compressor, the collection will not
be using compression across all secondaries as well (since collection
creation options are replicated to the secondaries, and cannot be changed
once the collection is created).
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