An overview of what's new in Mon

1. CTO, 10gen
Eliot Horowitz
What's New in MongoDB
2.4

2. Improvements made across…
• Development
• Operations
• Performance
• Security
• Enterprise Features

3. MongoDB 2.4
Developer Improvements

4. Geospatial

5. New Geospatial Features
• Polygon intersections
• More accurate spherical model
• $near and $within work with Aggregation
Framework
• Analytics now location-aware

6. GeoJSON
• Geospatial interchange format based on JSON
• Supports Points, LineStrings & Polygons
• Complete spec available at http://geojson.org

7. Point1 = {
type : "Point",
coordinates : [-73.947807, 40.663973]
}
somePoly = {
type : "Polygon",
coordinates : [[[40,5], [40,6],
[41,6], [41,5], [40,5]]]
}
GeoJSON

8. $GeoIntersects
• Leverages GeoJSON
• Geospatial query operator that selects all
locations that intersect with a GeoJSON object
• Uses spherical geometry

9. point1 = { type: "Point", coordinates: [40, 5.5]}
line1 = { type: "LineString",
coordinates: [[40, 3.5], [40, 4.5]]};
somePoly = { type : "Polygon",
coordinates : [[[40,5], [40,6],
[41,6], [41,5], [40,5]]]};
res = c.find({ geo : {
"$geoIntersects" :
{"$geometry" : somePoly}
}});
$GeoIntersects

10. Aggregation Framework

11. New Aggregation Framework
Features
• Introduced in 2.2, came of age in 2.4
• Performance Improvements
• 3 – 5 x faster
• Geo $near and $within support
• $concat support
• Support for Binary Data (pass through)

12. Text Search (beta)

13. Text Search (beta)
• Real-time indexes
• Case-insensitive
• Stemming, tokenization & stop words for 15 languages
• Index size is comparable with other full text search
implementations (larger than standard MongoDB
indexes)
• BETA status… please use in dev & give feedback

14. Stemming Examples
• { walk, walked, walking, walks } ⇒ walk
• {magazine, magazines, magazine’s } ⇒
magazine
• {runs, running, run, ran } ⇒ { run, ran }

15. Examples of English Stop
Words
{
am, themselves, of, before, here, whi
le, what's, myself, ought, me, the, int
o, about, this, do, can't, a, ... }

16. Option 1: on the command line
$ mongod --setParameter textSearchEnabled=true
Option 2: as admin command to mongod or mongos
> db.adminCommand(
{ setParameter: 1, textSearchEnabled: true }
)
Enabling Text Search

17. db.t.ensureIndex(
{ title: "text", post: "text" },
{ weights: { title: 10, post: 5 }}
)
Create a Text Search Index

18. db.t.runCommand(
"text",
{ search: ""my first blog entry"" }
);
Run a Text Search Command

19. {
"queryDebugString":"blog|entri|first||||my first blog entry||",
"language" : "english",
"results" : [{
"score" : 12,
"obj" : {
"_id" : 1,
"title" : "1st post",
"post" : "this is my first blog entry."
}}],
"stats" : {
"nscanned" : 7,
"nscannedObjects" : 0,
"n" : 0,
"nfound" : 1,
"timeMicros" : 122
},
"ok" : 1
}
Text Search Result
Note: debug string shows the stemmed terms, stop-words deleted

20. New Update Operators

21. Capped Arrays
• Provides the ability to manipulate arrays with
more control than ever before
• $push now supports the following:
• $each permits pushing multiple entries onto an
array
• $slice maintains a fixed size array
• Can be stacked with $sort

22. db.students.update(
{ _id: 1 },
{ $push: {
scores: {
$each: [
{ attempt: 3, score: 7 },
{ attempt: 4, score: 4 } ],
$sort: { score: 1 },
$slice: -3
}
}}
)
Top 3 Scores

23. New Upsert Operator

24. db.products.update(
{ _id: 1 },
{ $setOnInsert: { defaultQty: 500, inStock: true },
$set: { item: "apple" } },
{ upsert: true }
)
$setOnInsert

25. MongoDB 2.4
Operational Improvements

26. Hash-based Sharding

27. Hash-based Sharding
• Easier to manage clusters
• Less rebalancing
• More event distribution for reads and writes
• Lower potential performance from range based, but
more consistent.
• The hash stored in the hashed index is 64 bits of the
128 bit md5 hash
• MongoDB can use the hashed index to support equality
queries, but hashed indexes do not support range
queries.

28. db.activeCollection.ensureIndex(
{ field_to_hash: "hashed" }
)
Creating a Hashed Shard Key

29. Working Set Analyzer

30. Working Set Analyzer
• Working Set: The set of data kept in memory
• MongoDB performance best when working
set < RAM
• Working set analyzer measures resources used
over time
• Leads to more efficient MongoDB usage

31. db.serverStatus( { workingSet: 1 } )
db.runCommand( { serverStatus: 1, workingSet: 1 } )
"workingSet" : {
"note" : "thisIsAnEstimate",
"pagesInMemory" : <num>,
"computationTimeMicros" : <num>,
"overSeconds" : num
},
MongoStatus

32. Index Operation
Management

33. Index Operation Management
• A single mongod instance can build multiple
indexes in the background at the same time.
• db.killOp() can now kill foreground index builds
• Improved validation of index types

34. db.currentOp()
{
"inprog" : [ {
"opid" : 45,
"active" : true,
"secs_running" : 2,
"op" : "insert",
"ns" : "test.system.indexes",
...
}]
}
db.killOp(45)
Index Operation Management

35. Replication
Improvements

36. Role Based Privileges
Replication Improvements
• Better detection of network hiccups (less false
negatives)
• Faster initial sync when adding new secondary

37. MongoDB 2.4
Performance
Improvements

38. V8 JavaScript Engine
• Affects all JS processing including
MapReduce, the shell and $where queries
• Greater concurrency
• User feedback very positive indicating dramatic
improvement in overall processing time with new
V8

39. Improvements All Over
• Aggregation 3x – 5x faster
• Faster Counting
– Low-cardinality index-based counts up to 20x faster
– Better performance on counting, e.g., count all the
males/females in my user list
• Faster $elemMatch

40. MongoDB 2.4
Security Improvements

41. Role Based Privileges
Role Based Privileges
• Builds on access controls introduced in 2.2
• Users granted roles that have specific privileges per
database
• Users can have multiple roles
• Roles include
– read
– readWrite
– userAdmin
– dbAdmin
– clusterAdmin

42. Role Based Privileges
Enhanced SSL Support
• Supported in open source edition of MongoDB
• Must be compiled using --ssl flag
• Uses a standard .pem file that contains the SSL
certificate and key
• Complete directions available in the MongoDB
documentation
http://docs.mongodb.org/manual/administration/ssl/

43. Introducing MongoDB
Enterprise 2.4

44. MongoDB Enterprise
• Advanced Security
– Kerberos authentication protocol
– SSLsupportbuilt in
• Monitoring
– On-PremMonitoring- visualization,alerts on 100+ system metrics
– Includes same featuresas (MMS)
• Enterprise Software Integration
– SNMPsupports integration w/popularmonitoring tools (e.g., Nagios )
• Certified OS Support
– Red Hat/CentOS,Ubuntu andAmazon Linux

45. Subscriptions
Basic Standard Enterprise
Edition MongoDB MongoDB MongoDB Enterprise
SLA 4 hours 1 Hour 30 Minutes
Support
9am – 9pm ET
M – F
24x7x365 24x7x365
License AGPL Commercial Commercial
Price per Host $2,500 $5,000 $7,500