MongoDB 3.2.0 is the first release candidate of the 3.2 version. It features WiredTiger as the default storage engine, improvements to replication elections and sharded clusters, and the addition of partial indexes and document validation rules. The release also includes enhancements to mongodump and mongorestore.

1. MongoDB 3.2.0 Released

2. MongoDB released“MongoDB3.2.0-rc0” the first3.2 release candidate.
Main featuresof thisrelease
1. WiredTigerthe defaultstorage engine - MongoDB usesthe WiredTigerasthe defaultstorage engine.
But youcan change defaultstorage engine.
For change storage engine, runfollowingcommandintocommandline
mongod --storageEngine mmapv1
Anotheroptionstochange defaultstorage engineisuse configurationfile,usingthe storage.engine
setting:
storage:
engine:mmapv1
You can learnmore about storage engine here -
https://docs.mongodb.org/manual/reference/configuration-options/#storage.engine
2. ReplicationElectionEnhancements - MongoDB reducesreplicasetfailovertime andacceleratesthe
detectionof multiple simultaneousprimaries.
3. ShardedCluster Enhancements - MongoDB 3.2 deprecatesthe use of three mirroredMongodb
instancesforconfigservers.
4. Partial Indexes- MongoDB 3.2 providesthe optiontocreate indexesthatonlyindex the documentsin
a collectionthatmeetaspecifiedfilterexpression.Byindexingasubsetof the documentsina collection,
partial indexeshave lowerstorage requirementsandreducedperformance costsforindex creationand
maintenance.
5. DocumentValidation- Startingin 3.2, MongoDB providesthe capabilitytovalidatedocumentsduring
updatesandinsertions.Validationrulesare specifiedonaper-collectionbasis.MongoDBprovidesthe
followingnewoptions:
validator - optiontospecifyvalidationrules.
validationLevel - optiontodetermine how strictlyMongoDBappliesthe validationrulestoexisting
documentsduringanupdate.
validationAction- optiontodetermine whethertoerrorand rejectdocumentsthatviolate the
validationrules,orwarnabout the violationsinthe logbutallow invaliddocuments.
6. MongoDB Tools Enhancements - MongodumpandMongorestore SupportArchive Filesandstdout/in

3. You can read developmentrelease note for3.2.0 here
https://docs.mongodb.org/manual/release-notes/3.2/?_ga=1.262416773.864102024.1444882391
You can downloadthis release here
https://www.mongodb.org/downloads#development
Thanks
http://www.codeandyou.com
http://www.codeandyou.com/2015/10/mongodb-320-
released.html
Keywords – MongoDB, MongoDB 3.2.0, What is new in MongoDB 3.2.0