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MongoDB 1.6 is a drop-in replacement for 1.4. To upgrade, simply
mongod then restart with the new binaries.
Please note that you should upgrade to the latest version of whichever driver you're using. Certain drivers, including the Ruby driver, will require the upgrade, and all the drivers will provide extra features for connecting to replica sets.
Sharding is now production-ready, making MongoDB horizontally
scalable, with no single point of failure. A single instance of
mongod can now be upgraded to a distributed cluster with zero
downtime when the need arises.
Replica sets, which provide automated failover
among a cluster of
n nodes, are also now available.
Please note that replica pairs are now deprecated; we strongly recommend that replica pair users upgrade to replica sets.
wtimeout) forces writes to be propagated to
nservers before returning success (this works especially well with replica sets)
$slice operator for returning subsets of arrays
64 indexes per collection (formerly 40 indexes per collection)
64-bit integers can now be represented in the shell using NumberLong
findAndModifycommand now supports upserts. It also allows you to specify fields to return
$showDiskLoc option to see disk location of a document
Support for IPv6 and UNIX domain sockets
Windows service improvements
The C++ client is a separate tarball from the binaries
You can see a full list of all changes on JIRA.
Thank you everyone for your support and suggestions!