What’s New in MongoDB 2.6

Solutions Architect, MongoDB Inc.

Matias Cascallares

#MongoDBDays

@mcascallares

Recent Release History

2.4Mar‘13

2.6Apr ’14

2.2Aug ‘12

Aggregation Framework

Multi-Data Center Deployments

Improved Performance and Concurrency

Hash-based sharding

Text Search

V8 JavaScript engine

Faster counts

BiggestRelease Ever!

Main Improvement Areas

• Operations

• Integrated Search

• Query System

• Security

• Performance & Stability

Operations

New Wire Protocol

Client Server

write()

getLastError(w, j)

result

Version 2.4Version 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

Primarybackground

foregroundforeground

Version 2.4Version 2.6

background background

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