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Type: Improvement
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Resolution: Duplicate
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Priority: Major - P3
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None
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Affects Version/s: 2.0.0
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Component/s: Index Maintenance, Replication
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Labels:None
http://www.mongodb.org/display/DOCS/Index+Versions says "Creation of a new replica set secondary from scratch (initial sync) will result in all its indexes being of
{v:1}type". However, if the primary has a
{v:0}index the new secondary after syncing will also have
{v:0}for that index.