[DRAFT] Druid 0.12.3 release notes

[jon-wei]

DRAFT

Druid 0.12.3 contains stability improvements and bug fixes from 6 contributors. Major improvements include:

• More stable Kafka indexing service
• Several query bug fixes

The full list of changes is here: https://github.com/apache/incubator-druid/pulls?q=is%3Apr+milestone%3A0.12.3+is%3Aclosed

Documentation for this release is at: http://druid.io/docs/0.12.3

Highlights

More stable Kafka indexing service

0.12.3 fixes a serious issue where the Kafka indexing service would incorrectly delete published segments in certain situations. Please see #6155, contributed by @gianm, for details.

Other stability improvements include:

• Fix NPE in KafkaSupervisor.checkpointTaskGroup: Fix NPE in KafkaSupervisor.checkpointTaskGroup #6206, added by @jihoonson
• Fix NPE for taskGroupId when rolling update: Fix NPE for taskGroupId when rolling update #6168, added by @jihoonson

Query bug fixes

0.12.3 includes a memory allocation adjustment for the GroupBy query that should reduce heap usage. Added by @gaodayue in #6256.

This release also contains several fixes for the TopN and GroupBy queries when numeric dimension output types are used. Added by @gianm in #6220.

SQL fixes

Additionally, 0.12.3 includes the following Druid SQL bug fixes:

• Fix post-aggregator naming logic for sort-project: SQL: Fix post-aggregator naming logic for sort-project. #6250
• Fix precision of TIMESTAMP types: SQL: Fix precision of TIMESTAMP types. #5464
• Fix assumption that AND, OR have two arguments: SQL: Fix assumption that AND, OR have two arguments. #5470
• Remove useless boolean CASTs in filters: SQL: Remove useless boolean CASTs in filters. #5619
• Fix selecting BOOLEAN type in JDBC: SQL: Fix selecting BOOLEAN type in JDBC. #5401
• Support projection after sorting in SQL: Support projection after sorting in SQL #5788
• Fix missing postAggregations for Timeseries and TopN: [SQL] Fix missing postAggregations for Timeseries and TopN #5912
• Finalize aggregations for inner queries when necessary SQL: Finalize aggregations for inner queries when necessary. #6221

Other

0.12.3 fixes an issue with the druid-basic-security extension where non-coordinator nodes would sometimes fail when updating their cached views of the authentication and/or authorization tables from the coordinator. Fixed by @gaodayue in #6270.

Full change list

The full change list can be found here: https://github.com/apache/incubator-druid/pulls?q=is%3Apr+milestone%3A0.12.3+is%3Aclosed

Updating from 0.12.2 and earlier

0.12.3 is a minor release and compatible with 0.12.2. If you're updating from an earlier version than 0.12.2, please see release notes of the relevant intermediate versions for additional notes.

Credits

Thanks to everyone who contributed to this release!

@gaodayue
@gianm
@jihoonson
@jon-wei
@QiuMM
@vogievetsky
@wpcnjupt

[quenlang]

Do you have any plan to release this version ?

[jon-wei]

@quenlang Yes, 0.12.3 will be the next release, and the first release candidate 0.12.3-rc1 is available now.