General

• This release is focused on bug fixes since 1.1.1.

New features and improvements

• The maximum amount of memory that will be used by the document-level locking data structures is now configurable with the parameter locktreeMaxMemory=<bytes>, which defaults to 10% of cacheSize. (#340)
• It is now possible to get more debugging information in the log during a crash. To use this, download and unpack the -debuginfo tarball along with the binary tarball, and run with --gdbPath=/path/to/gdb.

Bug fixes

• Fixed a bug in background indexing and the bulk loader that caused indexes to be built as multi-key indexes, which causes the query planner to create non-optimal query plans. (#469)
• Optimized deletes, especially those performed on the oplog. (#471)