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| C# Driver Version 1.6.1 Release Notes | ||
| ===================================== | ||
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| This is a minor release containing a few bug fixes, particularly related to ReadPreference support | ||
| and sending commands to secondaries. | ||
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| An online version of these release notes is available at: | ||
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| https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v1.6.1.md | ||
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| File by file change logs are available at: | ||
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| https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Change%20Log%20v1.6.1-Bson.txt | ||
| https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Change%20Log%20v1.6.1-Driver.txt | ||
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| The full list of JIRA issues resolved in this release is available at: | ||
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| https://jira.mongodb.org/secure/IssueNavigator.jspa?mode=hide&requestId=12609 | ||
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| Changes to ReadPreference | ||
| ------------------------- | ||
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| The implementation of ReadPreference has been changed to more accurately follow the ReadPreference spec: | ||
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| http://docs.mongodb.org/manual/applications/replication/#read-preference | ||
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| The changes are: | ||
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| - SecondaryPreferred only uses the Primary if no secondaries are available (regardless of latency) | ||
| - SecondayAcceptableLatency is now configurable | ||
| - when sending queries to mongos: | ||
| - ReadPreference.Primary is encoded setting the SlaveOk bit on the wire protocol to 0 | ||
| - ReadPreference.SecondaryPreferred (without tags) is encoded setting the SlaveOk bit on the wire protocol to 1 | ||
| - all other ReadPreferences are encoded using $readPreference on the wire | ||
| - $query is now encoded before $readPreference as required by mongos | ||
| - commands now correctly use the collection settings (they were using the database settings) | ||
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| Sending commands to secondaries | ||
| ------------------------------- | ||
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| Only a limited set of commands are now allowed to be sent to secondaries. All other commands | ||
| will be sent to the primary regardless of the ReadPreference you specify. The commands | ||
| that can be sent to secondaries are: | ||
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| - aggregate | ||
| - collStats | ||
| - count | ||
| - dbStats | ||
| - distinct | ||
| - geoNear | ||
| - geoSearch | ||
| - geoWalk | ||
| - group | ||
| - mapReduce (but *only* if using Inline results) | ||
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| The corresponding helper methods in the C# driver are: | ||
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| - MongoCollection.Aggregate | ||
| - MongoCollection.GetStats | ||
| - MongoCollection.Count, MongoCursor.Count and MongoCursor.Size | ||
| - MongoDatabase.GetStats | ||
| - MongoCollection.Distinct | ||
| - MongoCollection.GeoNear and MongoCollection.GeoNearAs | ||
| - MongoCollection.GeoHaystackSearch and MongoCollection.GeoHaystackSearchAs | ||
| - MongoCollection.Group | ||
| - MongoCollection.MapReduce (with MapReduceOutputMode.Inline) | ||
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| There is no helper method (yet) for the geoWalk command. |