Changes in MongoDB 2.4

• Release Notes for MongoDB 2.4
  • Platform Support
  • Upgrade Process
  • Changes
    • Major Features
      • Text Search
      • New Geospatial Indexes with GeoJSON and Improved Spherical Geometry
      • New Hashed Index and Sharding with a Hashed Shard Key
    • Security Improvements
      • New Modular Authentication System with Support for Kerberos
      • Role Based Access Control and New Privilege Documents
      • Enhanced SSL Support
      • Compatibility Change: User Uniqueness Enforced
    • Administration Changes
      • --setParameter Option Available on the mongos and mongod Command Line
      • Changes to serverStatus Output Including Additional Metrics
      • Increased Chunk Migration Write Concern
      • BSON Document Validation Enabled by Default for mongod and mongorestore
    • Indexing Changes
      • Support for Multiple Concurrent Index Builds
      • db.killOp() Can Now Kill Foreground Index Builds
      • Improved Validation of Index Types
    • Interface Changes
      • $setOnInsert – New Update Operator
      • Limit Number of Elements in an Array
      • JavaScript Engine Changed to V8
      • Additional Limitations for Map-Reduce and $where Operations
      • Improvements to the Aggregation Framework
  • Additional Resources