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What's new in CockroachDB beta-20160609
June 9, 2016
A new beta release of CockroachDB is now available: beta-20160609. The download links on the installation instructions have been updated to point to the new release.
New Features
The SERIAL column type is now supported as an alias for INT DEFAULT unique_rowid(). In CockroachDB, this type defaults to a unique 64-bit signed integer that is the combination of the insert timestamp and the ID of the node executing the insert. It therefore differs from similar types in PostgreSQL and MySQL, which auto-increment integers in an approximate sequence. #7032
For client-side transaction retries, reissuing the original SAVEPOINT cockroach_restart now has the same effect as ROLLBACK TO SAVEPOINT cockroach_restart. This improves compatibility with some client drivers. #6955
FAMILY is now a reserved word in the SQL dialect in preparation for a future feature. #7069
Commands issued with a timestamp outside the garbage collection window will now always fail. #6992
All aggregate functions now return NULL when run on a table with no rows. #7043
Performance Improvements
jemalloc is now used as the memory allocator for the C++ portions of the server. The build tag stdmalloc can be used to switch back to the standard malloc.#7006
Raft logs are now garbage collected more aggressively. This should generally make snapshots smaller, reducing memory pressure, but sometimes it may cause more snapshots to be sent. #7040
Reduced allocations in INSERT and UPDATE statements involving secondary indexes. #7011
Improved performance of conditional puts with no existing value. #7016
Docs on the CREATE TABLE statement now offer both basic and expanded grammar diagrams. #347
Docs on constraints now include diagrams of all table-level and row-level constraints. #361
Contributors
This release includes 56 merged PRs by 17 authors. We would like to thank the following contributors from the CockroachDB community, especially first-time contributor Alex Robinson:
