Details
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New Feature
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Status: Closed
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Major - P3
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Resolution: Fixed
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Description
Implementation should follow the (10gen internal) spec defined here:
https://wiki.10gen.com/display/10GEN/Driver+Read+Semantics
PLEASE NOTE: The definition of SECONDARY is changing due to this spec. The SECONDARY option now means the same thing as SECONDARY_ONLY. A SECONDARY_PREFERRED option is being added that matches what SECONDARY used to do. SECONDARY_ONLY is deprecated in PyMongo 2.3.
These are the new preferences and their meaning:
"PRIMARY":
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Read from primary only. All operations produce an error (throw an exception where applicable) if primary is unavailable. Cannot be combined with tags.
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This is the default.
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"PRIMARY_PREFERRED":
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Read from primary if available, otherwise a secondary.
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"SECONDARY":
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Read from secondary if available, otherwise error.
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"SECONDARY_ONLY" (deprecated):
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Synonym for "SECONDARY"
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"SECONDARY_PREFERRED":
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Read from a secondary if available, otherwise read from the primary.
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"NEAREST":
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Read from any member.
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Also need to add better read preferences docs. A new examples page would probably be best.
Attachments
Issue Links
- is depended on by
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- Closed
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