This is a preview release of the next feature release of the Ruby MongoDB driver which will support MongoDB server 4.4.

This release includes the following new features:

• RUBY-1999 MONGODB-AWS authentication mechanism
• RUBY-1994 Shorter SCRAM conversations, RUBY-2168 Speculative authentication support
• RUBY-2126 Unified replica set discovery behavior
• Hint support RUBY-2097, RUBY-2148, RUBY-1972, RUBY-2001
• RUBY-2000 Support for allowDiskUse on find operations
• RUBY-2184 Driver support for server Hedged Reads
• RUBY-2221 'CommitQuorum' option support for 'createIndexes’ command on MongoDB 4.4
• RUBY-2181 Ensure that the WriteConcernError "errInfo" object is propagated

The following minor improvements were made:

• RUBY-2261 Reduce default keepalive time to align with Azure defaults
• RUBY-2137 Include JRuby version in app metadata
• RUBY-2230 Rescue write errors in GridFS for cleanup purposes in addition to read errors
• RUBY-1997 Handle absence of 'ns' field in index specifications returned from listIndexes
• RUBY-2041 Ensure server proof has been validated during SCRAM conversation
• RUBY-2272 Exceptions raised during address resolution are not mapped to Mongo::Error