Support Engineer, 10gen Australia

Stephen Steneker (stennie@10gen.com)

#MongoMelbourne

Roadmap

Recent Release History

2.2Aug ‘12

2.4 Winter ‘13

2.0Sept ‘11

1.8March ‘11

Journaling

Sharding and Replica set enhancements

Spherical geo search

Index enhancements to improve size and performance

Authentication with sharded clusters

Replica Set Enhancements

Concurrency improvements

Aggregation Framework

Multi-Data Center Deployments

Improved Performance and Concurrency

2.2 Overview

2.2 Release August 2012

• Concurrency: yielding + db level locking

• New aggregation framework

• TTL Collections

• Improved free list implementation

• Tag aware sharding

• Read Preferences

• http://docs.mongodb.org/manual/release-notes/2.2/

Yielding and DB Locking

• Improved yielding on page fault

• Breaking down the global level lock– Lock per Database in 2.2

• Writes on secondaries applied in batches

Aggregation Framework

• Pipeline model (a bit like unix pipes)– Like a "group by"– Operators

• $project, $group, $match, $limit, $skip, $unwind, $sort

– Expressions• Logical Expressions: $and, $not, $or, $cmp ...• Math Expressions: $add, $divide, $mod ...• String Expressions: $strcasecmp, $substr, $toLower ...• Date/Time Expressions: $dayOfMonth, $hour...• Multi-Expressions: $ifNull, $cond

• Use Cases: Real-time / inline analytics

Time to Live (TTL)

• Auto expire data out of a collection

• Must be on a date datatype

• Single value is evaluated

• Use Cases: data retention, cache expiration

db.events.ensureIndex( { "timestamp": 1 }, { expireAfterSeconds: 3600 } )

Tag Aware Sharding

• Distribute data based on a Tag

• Use Cases: Locality for Data by Data Center

sh.addShardTag("shard0000", "dc-emea")

sh.addTagRange("mydb.users", { country: "uk"}, { country: "ul"}, "dc-emea");

sh.addTagRange("mydb.users", { country: "by"},{ country: "bz"}, "dc-emea");

Read Preferences

• Mode– PRIMARY, PRIMARY_PREFERRED– SECONDARY, SECONDARY_PREFERRED– NEAREST

• Tag Sets– Uses Replica Set tags– Passed Tag is used to find matching members

2.4 and Beyond

2.4 Highlights

• Security– SASL, Kerberos, Additions to privileges and auditing

• Hash-based Sharding

• Geospatial Indexing: query intersecting polygons

• Aggregation framework: faster and more features

• V8, background secondary indexing, replica set flapping

• Distribute non-sharded collections throughout cluster

• MMS running in your own data center (separate)

Ongoing Work

• Collection / Extent level locking

• Field level authorization

• Auditing

• Full-text query

What can I do?

• MongoDB is a community driven product– Use the product– Log feature requests– Vote for existing features

• Join Melbourne MongoDB User Group– http://www.meetup.com/Melbourne-MongoDB-

User-group

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