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Enabling the session command history but limiting it to a history of 50 commands allows reconnections for sessions that don't change the state too often. As pooled connections will exceed this limit quite fast, they are not able to reconnect to servers once connections are lost. To solve this problem, the session command history needs a compaction process that removes redundant history.
63 lines
2.4 KiB
Markdown
63 lines
2.4 KiB
Markdown
# MariaDB MaxScale 2.3.0 Release Notes
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Release 2.2.0 is a Beta release.
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This document describes the changes in release 2.3.0, when compared to
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release 2.2.
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For any problems you encounter, please consider submitting a bug
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report at [Jira](https://jira.mariadb.org).
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## Changed Features
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### Session Command History
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The _readwritesplit_ session command history is now enabled mby default but it
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is limited to a total of 50 distict session commands. This default allows most
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sessions to leverage the newly improved reconnection mechanism without having to
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explicitly enable the history. When the limit of 50 commands is exceeded, the
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session command history is disabled. This makes it possible to use pooled
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connections by default without having to explicitly disable the history (this
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was the case with pre-2.1 versions of MaxScale).
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The way that the history is stored has also changed. Instead of storing all
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session commands, each session only stores the first and last execution of each
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command. This way the history is compressed into a compact representation while
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still retaining the relative order of each command.
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To keep the old functionality, add `disable_sescmd_history=true` to the service
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definition.
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## Dropped Features
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## New Features
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### Runtime Configuration of the Cache
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With the variable `@maxscale.cache.enabled` it is now possible for a
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client to specify whether the cache should be used. Please see the
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[Cache](../Filters/Cache.md) documentation for details.
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## Bug fixes
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[Here is a list of bugs fixed in MaxScale 2.3.0.](https://jira.mariadb.org/issues/?jql=project%20%3D%20MXS%20AND%20issuetype%20%3D%20Bug%20AND%20status%20%3D%20Closed%20AND%20fixVersion%20%3D%202.3.0)
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## Known Issues and Limitations
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There are some limitations and known issues within this version of MaxScale.
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For more information, please refer to the [Limitations](../About/Limitations.md) document.
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## Packaging
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RPM and Debian packages are provided for the Linux distributions supported
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by MariaDB Enterprise.
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Packages can be downloaded [here](https://mariadb.com/resources/downloads).
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## Source Code
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The source code of MaxScale is tagged at GitHub with a tag, which is identical
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with the version of MaxScale. For instance, the tag of version X.Y.Z of MaxScale
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is X.Y.Z. Further, *master* always refers to the latest released non-beta version.
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The source code is available [here](https://github.com/mariadb-corporation/MaxScale).
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