This release will only be available through manual upgrades. Clusters set to automatic upgrades will not receive this release. For how to configure upgrades, please see [classic](https://docs.microsoft.com/en-us/azure/service-fabric/service-fabric-cluster-upgrade) or [managed](https://docs.microsoft.com/en-us/azure/service-fabric/how-to-managed-cluster-configuration) documentation.
## Contents
* [Service Fabric Packages and Versions](#service-fabric-packages-and-versions)
* [Service Fabric Feature and Bug Fixes](#service-fabric-feature-and-bug-fixes)
* [Retirement and Deprecation Path Callouts](#retirement-and-deprecation-path-callouts)
* [Repositories and Download Links](#repositories-and-download-links)
## Service Fabric Packages and Versions
The following packages and versions are part of this release:
| **Windows - 9.0.1553.9590<br>Ubuntu 18 - 9.0.1489.1<br>Ubuntu 20 - 9.0.1489.1** | **Feature** | Key Value Store (KVS) | **Brief Description**: The KVS databases now have an automatic compaction feature based on the percentage of free page size. This feature utilizes the "FreePageSizeThresholdInPercent" setting, which has a default value of 30%. The system still supports legacy settings such as "CompactionThresholdInMB", "FreePageSizeThresholdInMB", and "CompactionProbabilityInPercent", if they are still in use.<br>**Solution**: Customers should start using the new "FreePageSizeThresholdInPercent" property for customizing when offline auto-compaction occurs as the legacy settings will be removed in the next major Service Fabric runtime update. <br>**Workaround**: Auto-compaction based on "FreePageSizeThresholdInPercent" can be disabled by setting the value to 100
| **Windows - 9.0.1380.9590<br>Ubuntu 18 - 9.0.1317.1<br>Ubuntu 20 - 9.0.1317.1** | **Feature** | Key Value Store (KVS) | **Brief Description**: To ensure that the free page size is accurately calculated and used for auto-compaction purposes, all KVS databases will undergo regular defragmentation. <br>**Solution**: Customers can adjust the frequency of defragmentation using "MaxDefragFrequencyInMinutes".
| **Windows - 9.0.1380.9590<br>Ubuntu 18 - 9.0.1317.1<br>Ubuntu 20 - 9.0.1317.1** | **Feature** | Key Value Store (KVS) | **Brief Description**: The "IntrinsicValueThresholdInBytes" setting controls the size of long values stored in a record. If a value exceeds this size, it is stored as an Long Value ID (LVID) within the record. Presently, the default value is 0 which sets the size to 1024 bytes. However, in the future, the value will be changed to 5120 bytes to enable storage of long values up to approximately 5KB within a record. This change is expected to minimize LVID creation and mitigate the risk of LVID exhaustion. <br>**Solution**: The default value of the IntrinsicValueThresholdInBytes is set to 5120 bytes.
| **Windows - 9.0.1380.9590<br>Ubuntu 18 - 9.0.1317.1<br>Ubuntu 20 - 9.0.1317.1** | **Feature** | Key Value Store (KVS) | **Brief Description**: Legacy Compaction Settings (CompactionThresholdInMB, FreePageSizeThresholdInMB, and CompactionProbabilityInPercent) will be removed in the next major Service Fabric runtime version and functionality will be replaced with "FreePageSizeThresholdInPercent". These settings are deprecated and documented in the public API documentation to use the new "FreePageSizeThresholdInPercent" setting. <br>**Solution**: Customers should start using the new "FreePageSizeThresholdInPercent" property for customizing when offline auto-compaction occurs. <br>**Documentation Reference**:<ul><li>[CompactionProbabilityInPercent Property](https://learn.microsoft.com/en-us/dotnet/api/system.fabric.localesestoresettings.compactionprobabilityinpercent?view=azure-dotnet)</li><li>[FreePageSizeThresholdInMB Property](https://learn.microsoft.com/en-us/dotnet/api/system.fabric.localesestoresettings.freepagesizethresholdinmb?view=azure-dotnet)</li><li>[CompactionThresholdInMB Property](https://learn.microsoft.com/en-us/dotnet/api/system.fabric.localesestoresettings.compactionthresholdinmb?view=azure-dotnet)</li></ul>
| **Windows - 9.0.1380.9590<br>Ubuntu 18 - 9.0.1317.1<br>Ubuntu 20 - 9.0.1317.1** | **Feature** | Key Value Store (KVS) | **Brief Description**: Legacy Defragmentation setting "DefragThresholdInMB" will be removed in the next major Service Fabric runtime version (June 2023) as regular defragmentation will occur by default. This setting is deprecated and documented in the public API documentation to use the new setting "MaxDefragFrequencyInMinutes". <br>**Solution**: Customers should start using "MaxDefragFrequencyInMinutes" to adjust frequency of defragmentation going forward. <br>**Documentation Reference**: [MaxDefragFrequency Property](https://learn.microsoft.com/en-us/dotnet/api/system.fabric.localesestoresettings.maxdefragfrequencyinminutes?view=azure-dotnet#system-fabric-localesestoresettings-maxdefragfrequencyinminutes)
| **Windows - 9.0.1380.9590<br>Ubuntu 18 - 9.0.1317.1<br>Ubuntu 20 - 9.0.1317.1** | **Feature** | Key Value Store (KVS) | **Brief Description**: "IntrinsicValueThresholdInBytes" and "DatabasePageSizeInKB" will be removed in the next major Service Fabric runtime version (June 2023). The optimal value for these settings will be decided internally and will not be allowed to be override. <br>**Solution**: Customers will not be able to override "IntrinsicValueThresholdInBytes" and "DatabasePageSizeInKB" these settings <br>**Documentation Reference**: <ul><li>[DatabasePageSizeInKB Property](https://learn.microsoft.com/en-us/dotnet/api/system.fabric.localesestoresettings.databasepagesizeinkb?view=azure-dotnet)</li><li>[IntrinsicValueThresholdInBytes Property](https://learn.microsoft.com/en-us/dotnet/api/system.fabric.localesestoresettings.intrinsicvaluethresholdinbytes?view=azure-dotnet)</li></ul>
## Retirement and Deprecation Path Callouts
* As aligned with [Microsoft .NET and .NET Core - Microsoft Lifecycle | Microsoft Learn](https://learn.microsoft.com/en-us/lifecycle/products/microsoft-net-and-net-core), SF Runtime has dropped support for Net Core 3.1 as of December 2022. For supported versions see [Service Fabric supported Linux versions](https://learn.microsoft.com/en-us/azure/service-fabric/service-fabric-versions#current-versions-1) and migrate applications as needed.
* Ubuntu 18.04 LTS will reach its 5-year end-of-life window on June, 2023. Service Fabric runtime will drop support for 18.04 LTS after the published date, and we recommend moving your clusters and applications to supported versions listed here: [Service Fabric supported Linux versions](https://learn.microsoft.com/en-us/azure/service-fabric/service-fabric-versions#supported-linux-versions-and-support-end-date)
* Service Fabric runtime will soon stop supporting BinaryFormatter based remoting exception serialization by default and move to using Data Contract Serialization (DCS) based remoting exception serialization by default. Current applications using it will continue to work as-is, but Service Fabric strongly recommends moving to using Data Contract Serialization (DCS) based remoting exception instead.
* Service Fabric runtime will soon be archiving and removing Service Fabric runtime version 6.4 packages and older, as well as SDK version 3.3 packages and older from the package Download Center. Archiving/Removing will affect application scaling and re-imaging of virtual machines in a Service Fabric Cluster running on unsupported versions. After older versions are removed/archived, this may cause failure while rolling back when the current in-progress upgrade has errors.
