Details
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Improvement
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Resolution: Won't Fix
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Major - P3
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None
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None
Description
http://docs.mongodb.org/manual/reference/write-concern/
Due to the write API rework in 2.6, mongos does not support or propagate operations with a write concern of 0 (unacknowledged). Naturally, this hurts performance when switching from pre-2.6 or a replica set to a sharded cluster.
barriebehackett jeff.yemin sam.weaverThis should probably be clearly documented in the driver documentation if not entirely disallowed.It's really easy to use w:0 against a sharded cluster and not realize it's not the same.