What’s New in MongoDB 2.6

Solutions Architect, MongoDB Inc.

Matias Cascallares

#MongoDBDays @mcascallares

Recent Release History

2.4 Mar‘13

2.6 Apr ’14

2.2 Aug ‘12

Aggregation Framework

Multi-Data Center Deployments

Improved Performance and Concurrency

Hash-based sharding

Text Search

V8 JavaScript engine

Faster counts

Biggest Release

Ever!

Main Improvement Areas

•  Operations

•  Integrated Search

•  Query System

•  Security

•  Performance & Stability

Operations

New Wire Protocol

Client Server

write()

getLastError(w, j)

result

Version 2.4

Version 2.6

write(w, j)

result

Bulk Writes

•  You need to import big set of documents

•  … and you want error control

•  … and you are concerned about performance

Bulk Writes - Ordered

Bulk Writes - Unordered

Maximum Time Per Query

Background Indexing and Replication

Secondary Secondary

Primary background Version

2.4 Version

2.6

Storage Allocation

•  In databases with great delete ratios we can face some fragmentation

•  Similar effect with those updates that increase document size

•  Defragment a database can be an expensive operation

•  Our goal? Reduce database fragmentation

Storage Allocation

•  usePowerOf2Sizes will be the default allocation method for new collections

56 bytes

64 bytes

102 bytes

128 bytes

Integrated Search

Text Search

•  Now production-ready

•  Integrated with query engine

•  Integrated with aggregation framework

•  Multi-language document support

Features

•  Language-specific tokenization and stemming

•  Stop words

•  Relevance ranking

•  Field boosting

Supported Languages

da – Danish en – English

nl – Dutch fi – Finish

fr – French de – German

hu – Hungarian it – Italian

no – Norwegian pt – Portuguese

ro – Romanian ru – Russian

es – Spanish sv – Swedish

tr - Turkish

Integrated within find()

Integrated within aggregate()

More Text Examples

Relevance

Forcing a Language

Query System Improvements

Query System Improvements

•  Index Intersection

•  Aggregation Framework

•  New Update Operators

Index Intersection

•  Simpler ad-hoc queries

•  Existing indexes can be combined to optimize a query –  Less Index Maintenance –  Smaller Working Set –  Lower Write Overhead –  More Adaptive –  Able to control potential intersections using QueryShape

Index Intersection

Aggregation Framework - Output

Aggregation Framework - Explain

Aggregation Framework - Explain

Aggregation Framework - Set Operators

•  $project operator in the aggregation pipeline now supports an expanded set of expressions –  $setIsSubset –  $setEquals –  $setDifference –  $setIntersection –  $setUnion –  $allElementsTrue –  $anyElementTrue

New Update Operators

•  $mul

•  $min/$max

•  $bit

•  $currentDate

•  New modifiers for $push

Security

Security

•  Authentication with LDAP (Enterprise only)

•  x.509 Certificates

•  User defined roles

•  Collection level security

•  Auditing (Enterprise only)

•  Windows Kerberos Support

State of Security in MongoDB 2.6

•  Authentication –  Who are you? –  X.509 authentication and Kerberos

•  Authorization –  What can you do? –  User Defined Roles, Collection-level Access Control

•  Auditing –  What have you done? –  DDL, User Manipulation, Authorization failure

Roles and Collection-level Security

Auditing

•  Schema actions

•  Replica Set actions

•  Authentication & Authorization actions

•  Other actions

Auditing – Dropping a collection

Auditing – Shutting down the server

Performance & Stability

Improving Performance and Scalability

•  Query router connection pooling

•  Mixed SSL connections

•  Expanded SNMP support

•  Oplog processing is MUCH faster

•  New commands for sharded environments

Thanks

Solutions Architect, MongoDB Inc.

Matias Cascallares

#MongoDBDays @mcascallares