Details
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Bug
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Resolution: Done
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Major - P3
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None
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Description
http://docs.mongodb.org/manual/core/sharding-chunk-splitting/
This page states: "When a chunk grows beyond the specified chunk size, a mongos instance will split the chunk in half."
This is not always strictly true. The mongo s will try to split it in half, but supposing you've chosen a shard key with insufficient cardinality, and all data on the chunk has the same shard value, it will never split even though it outgrows 64MB.