> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/release-notes/community-server/old-releases/10.3/10.3.21.md).

# MariaDB 10.3.21 Release Notes

The most recent release of [MariaDB 10.3](/docs/release-notes/community-server/old-releases/10.3/what-is-mariadb-103.md) is:[**MariaDB 10.3.39**](/docs/release-notes/community-server/old-releases/10.3/10.3.39.md) Stable (GA) [Download Now](https://downloads.mariadb.org/mariadb/10.3.39/)

Note that this version contains an issue that disabled all events created by a server with a different server\_id. See [MDEV-21758](https://jira.mariadb.org/browse/MDEV-21758) for details.

[Download](https://downloads.mariadb.org/mariadb/10.3.21/) | [Release Notes](/docs/release-notes/community-server/old-releases/10.3/10.3.21.md) | [Changelog](/docs/release-notes/community-server/changelogs/changelogs-mariadb-10-3-series/mariadb-10321-changelog.md) | [Overview of 10.3](/docs/release-notes/community-server/old-releases/10.3/what-is-mariadb-103.md)

**Release date:** 11 Dec 2019

[MariaDB 10.3](/docs/release-notes/community-server/old-releases/10.3/what-is-mariadb-103.md) is the previous stable series of MariaDB, and an evolution of [MariaDB 10.2](/docs/release-notes/community-server/old-releases/10.2/what-is-mariadb-102.md) with several entirely new features\
not found anywhere else and with backported and reimplemented features from\
MySQL.

[MariaDB 10.3.21](/docs/release-notes/community-server/old-releases/10.3/10.3.21.md) is a [***Stable (GA)***](/docs/release-notes/community-server/about/release-criteria.md) release.

**For an overview of MariaDB Server 10.3 see the** [**What is MariaDB 10.3?**](/docs/release-notes/community-server/old-releases/10.3/what-is-mariadb-103.md) **page.**

Thanks, and enjoy MariaDB!

## Notable Changes

### General

* [MDEV-13492](https://jira.mariadb.org/browse/MDEV-13492): SEC\_E\_INVALID\_TOKEN when server sends large message during SSL handshake

### mariadb-backup

* [MDEV-18310](https://jira.mariadb.org/browse/MDEV-18310): Aria engine: Undo phase failed from incremental backup

### InnoDB

* [MDEV-20949](https://jira.mariadb.org/browse/MDEV-20949): Stop issuing '`row size`' error on DML
* [MDEV-20832](https://jira.mariadb.org/browse/MDEV-20832): Don't print "`row size too large`" warnings in error log if `innodb_strict_mode=OFF` and `log_warnings<=2`
* [MDEV-21024](https://jira.mariadb.org/browse/MDEV-21024): Remove redundant writes to the redo log
* [MDEV-21069](https://jira.mariadb.org/browse/MDEV-21069): Crash on `DROP TABLE` if the data file is corrupted
* some cleanup of AIO code, to better report errors
* [MDEV-20611](https://jira.mariadb.org/browse/MDEV-20611): MRR scan over partitioned InnoDB table produces "Out of memory" error
* [MDEV-21088](https://jira.mariadb.org/browse/MDEV-21088): Table cannot be loaded after instant ADD/DROP COLUMN
* [MDEV-21045](https://jira.mariadb.org/browse/MDEV-21045): heap-use-after-poison in `ADD PRIMARY KEY` after instant `ADD COLUMN`
* [MDEV-21172](https://jira.mariadb.org/browse/MDEV-21172): Memory leak after failed `ADD PRIMARY KEY`
* [MDEV-21158](https://jira.mariadb.org/browse/MDEV-21158): `trx_undo_seg_free()` is never redo-logged

### Optimizer

* [MDEV-21044](https://jira.mariadb.org/browse/MDEV-21044): Wrong result when using a smaller size for sort buffer
* [MDEV-20611](https://jira.mariadb.org/browse/MDEV-20611): MRR scan over partitioned InnoDB table produces "Out of memory" error

### Replication

* [MDEV-19376](https://jira.mariadb.org/browse/MDEV-19376): `Repl_semi_sync_master::commit_trx` assertion failure

### Versioning

* [MDEV-18929](https://jira.mariadb.org/browse/MDEV-18929): 2nd execution of SP does not detect `ER_VERS_NOT_VERSIONED`
* [MDEV-21011](https://jira.mariadb.org/browse/MDEV-21011): Table corruption reported for versioned partitioned table after `DELETE`

### Misc

* Packages for Fedora 31 have been added in this release
* As per the [MariaDB Deprecation Policy](/docs/release-notes/community-server/about/platform-deprecation-policy.md), this will be the last release of [MariaDB 10.3](/docs/release-notes/community-server/old-releases/10.3/what-is-mariadb-103.md) for Fedora 29
* Fixes for the following [security vulnerabilities](/docs/server/security/cve.md):
  * CVE-\`-\`\`\`

When upgrading from [MariaDB 10.3.8](/docs/release-notes/community-server/old-releases/10.3/10.3.8.md) or earlier to [MariaDB 10.3.9](/docs/release-notes/community-server/old-releases/10.3/10.3.9.md) or higher,\
running [mysql\_upgrade](/docs/server/clients-and-utilities/legacy-clients-and-utilities/mysql_upgrade.md) is **required** due to changes introduced in[MDEV-14637](https://jira.mariadb.org/browse/MDEV-14637).

## Changelog

For a complete list of changes made in [MariaDB 10.3.21](/docs/release-notes/community-server/old-releases/10.3/10.3.21.md), with links to detailed\
information on each push, see the [changelog](/docs/release-notes/community-server/changelogs/changelogs-mariadb-10-3-series/mariadb-10321-changelog.md).

## Contributors

For a full list of contributors to [MariaDB 10.3.21](/docs/release-notes/community-server/old-releases/10.3/10.3.21.md), see the [MariaDB Foundation release announcement](https://mariadb.org/mariadb-10-4-11-10-3-21-and-10-2-30-now-available/).

{% hint style="info" %}
Be notified of new MariaDB Server releases automatically by [subscribing](https://lists.mariadb.org/postorius/lists/announce.lists.mariadb.org/) to the MariaDB Foundation community announce 'at' lists.mariadb.org announcement list (this is a low traffic, announce-only list). MariaDB plc customers will be notified for all new releases, security issues and critical bug fixes for all MariaDB plc products thanks to the Notification Services.

MariaDB may already be included in your favorite OS distribution. More information can be found on the [Distributions which Include MariaDB](/docs/general-resources/distributions-including-mariadb.md) page.
{% endhint %}

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