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NEWS entry for 1.2.0
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NEWS

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mongo-c-driver 1.2.0
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====================
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It is my pleasure to announce to you the MongoDB C driver 1.2.0.
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This is a stable release with additive ABI changes and bugfixes. It is
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compatible with MongoDB version 2.4 and later.
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The following notes summarize changes since the previous stable release,
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1.1.11, including changes in the 1.2.0 betas and release candidate.
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This version rewrites mongoc_client_t's internals to match two important new
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specs for MongoDB drivers: the Server Discovery And Monitoring Spec and the
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Server Selection Spec. The rewritten client has many advantages:
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* All replica set members or mongos servers are discovered and periodically
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checked in parallel. The driver's performance is dramatically better and
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more predictable with multi-server deployments, or with a flaky network,
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or when some servers are slow or down.
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* Clients from the same mongoc_client_pool_t share a background thread that
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discovers and monitors all servers in parallel.
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* Unnecessary round trips for server checks and pings are eliminated.
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* Behavior is documented in the specs, and consistent with other drivers,
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even in complex or unusual scenarios.
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* The URI's "replicaSet" option is enforced: the driver now refuses to connect
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to a server unless it is a member of a replica set with the correct setName.
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* Many race conditions related to changing deployment conditions are fixed.
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To conform to the new specs, the client now accepts these options in the
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MongoDB URI; see the mongoc_uri_t documentation for details:
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* heartbeatFrequencyMS
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* serverSelectionTimeoutMS
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* serverSelectionTryOnce
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* socketCheckIntervalMS
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Other features:
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* All timeouts that can be configured in the URI now interpret 0 to mean "use
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the default value for this timeout".
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* The client's read preference can be configured in the URI with the new
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options "readPreference" and "readPreferenceTags"; see the mongoc_uri_t
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documentation.
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* The new mongoc_uri_get_read_prefs_t function retrieves both the read mode
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and tags from a mongoc_uri_t.
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* New accessors mongoc_gridfs_file_get_id, mongoc_client_get_default_database,
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and mongoc_bulk_operation_get_write_concern.
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* Debug tracing can be controlled at runtime with mongoc_log_trace_enable and
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mongoc_log_trace_disable.
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* Set mongoc_client_pool_t's size with mongoc_client_pool_min_size()
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and mongoc_client_pool_max_size().
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Other changes:
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* Enable runtime asserts in release build.
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* The libbson submodule's URL now uses the recommended https://, not git://
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* mongoc_client_kill_cursor is now deprecated and will be removed in 2.0.
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* The write concern "w=-1" is documented as obsolete.
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These notable bugs have been fixed since 1.1.11:
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* The driver now uses the server's maxWireVersion to avoid an error and
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extra round-trip when executing aggregations on MongoDB 2.4 and older.
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* Much improved reporting of network errors, unavailable servers, and
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authentication failure
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* Off-by-one error in mongoc_gridfs_file_seek with mode SEEK_END
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* The writeConcernErrors field of bulk results is properly formatted.
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* A cursor with a server "hint" sets slaveOkay and / or $readPreference.
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* Destroying an exhaust cursor must close its socket
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* "wtimeoutms" was ignored for write concerns besides "majority".
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* Bulk write operations might fail in mixed-version sharded clusters with
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some pre-2.6 mongos servers.
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* A variety of bugs and incorrect results in mongoc_bulk_operation_execute.
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* Numerous compiler warnings and build failures on various platforms.
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* Copious refinements to the documentation.
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Thanks to everyone who contributed to this version of libmongoc.
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* Jason Carey
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* Samantha Ritter
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* A. Jesse Jiryu Davis
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* Hannes Magnusson
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* Kyle Suarez
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* Jeremy Mikola
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* Remi Collet
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* Jose Sebastian Battig
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* Derick Rethans
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* Yuchen Xie
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* Manuel Schoenlaub
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* Sujan Dutta
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* Lloyd Zhou
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* rubicks
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* Pawel Szczurko
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* Yuval Hager
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Peace,
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A. Jesse Jiryu Davis
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mongo-c-driver 1.2.0-rc0
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========================
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