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HDDS-16107. Add Ozone 2.2.1 download and release notes #539

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| Version | Release Date | Source Download | Binary Download | Release Notes |
| ------- | ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------- |
| 2.2.1 | TBD | [Source](https://www.apache.org/dyn/closer.cgi/ozone/2.2.1/ozone-2.2.1-src.tar.gz)<br/>[Checksum](https://downloads.apache.org/ozone/2.2.1/ozone-2.2.1-src.tar.gz.sha512)<br/>[Signature](https://downloads.apache.org/ozone/2.2.1/ozone-2.2.1-src.tar.gz.asc) | [Binary](https://www.apache.org/dyn/closer.cgi/ozone/2.2.1/ozone-2.2.1.tar.gz)<br/>[Checksum](https://downloads.apache.org/ozone/2.2.1/ozone-2.2.1.tar.gz.sha512)<br/>[Signature](https://downloads.apache.org/ozone/2.2.1/ozone-2.2.1.tar.gz.asc) | [Release Notes](/release-notes/2.2.1) |
| 2.2.0 | 2026 Jul 15 | [Source](https://www.apache.org/dyn/closer.cgi/ozone/2.2.0/ozone-2.2.0-src.tar.gz)<br/>[Checksum](https://downloads.apache.org/ozone/2.2.0/ozone-2.2.0-src.tar.gz.sha512)<br/>[Signature](https://downloads.apache.org/ozone/2.2.0/ozone-2.2.0-src.tar.gz.asc) | [Binary](https://www.apache.org/dyn/closer.cgi/ozone/2.2.0/ozone-2.2.0.tar.gz)<br/>[Checksum](https://downloads.apache.org/ozone/2.2.0/ozone-2.2.0.tar.gz.sha512)<br/>[Signature](https://downloads.apache.org/ozone/2.2.0/ozone-2.2.0.tar.gz.asc) | [Release Notes](/release-notes/2.2.0) |
| 2.1.1 | 2026 Jun 21 | [Source](https://www.apache.org/dyn/closer.cgi/ozone/2.1.1/ozone-2.1.1-src.tar.gz)<br/>[Checksum](https://downloads.apache.org/ozone/2.1.1/ozone-2.1.1-src.tar.gz.sha512)<br/>[Signature](https://downloads.apache.org/ozone/2.1.1/ozone-2.1.1-src.tar.gz.asc) | [Binary](https://www.apache.org/dyn/closer.cgi/ozone/2.1.1/ozone-2.1.1.tar.gz)<br/>[Checksum](https://downloads.apache.org/ozone/2.1.1/ozone-2.1.1.tar.gz.sha512)<br/>[Signature](https://downloads.apache.org/ozone/2.1.1/ozone-2.1.1.tar.gz.asc) | [Release Notes](/release-notes/2.1.1) |
| 2.0.0 | 2025 Apr 30 | [Source](https://www.apache.org/dyn/closer.cgi/ozone/2.0.0/ozone-2.0.0-src.tar.gz)<br/>[Checksum](https://downloads.apache.org/ozone/2.0.0/ozone-2.0.0-src.tar.gz.sha512)<br/>[Signature](https://downloads.apache.org/ozone/2.0.0/ozone-2.0.0-src.tar.gz.asc) | [Binary](https://www.apache.org/dyn/closer.cgi/ozone/2.0.0/ozone-2.0.0.tar.gz)<br/>[Checksum](https://downloads.apache.org/ozone/2.0.0/ozone-2.0.0.tar.gz.sha512)<br/>[Signature](https://downloads.apache.org/ozone/2.0.0/ozone-2.0.0.tar.gz.asc) | [Release Notes](/release-notes/2.0.0) |
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# Release 2.2.1 Available

![Katmai-haiku](/releases-2.2.0.jpg)

## Release Notes

Apache Ozone 2.2.1 is a maintenance release on top of Ozone 2.2.0 with bug fixes, performance improvements, and dependency updates.

## Notable Fixes

### [HDDS-15783](https://issues.apache.org/jira/browse/HDDS-15783) — SCM fails to deserialize empty lists from Ratis log

Fixed deserialization failure when SCM Ratis log entries contained empty lists, which could block SCM startup or state replay.

---

### [HDDS-15578](https://issues.apache.org/jira/browse/HDDS-15578) — InvalidStateTransitionException can crash SCM

SCM no longer crashes from uncaught InvalidStateTransitionException during container state updates.

---

### [HDDS-15791](https://issues.apache.org/jira/browse/HDDS-15791) — EC RECOVERING container data loss after idle scrub

Fixed EC offline reconstruction data loss when idle RECOVERING containers were scrubbed and auto-recreated as partial CLOSED replicas.

---

### [HDDS-15849](https://issues.apache.org/jira/browse/HDDS-15849) — gRPC client shutdown slows parallel reads

Fixed a performance regression where gRPC client shutdown blocked the datanode client cache lock for 100 ms or more per close, causing severe slowdown in parallel read workloads such as EC reconstruction.

---

### [HDDS-15665](https://issues.apache.org/jira/browse/HDDS-15665) — Datanode transaction iterator race condition

Fixed a race condition in the datanode transaction iterator that could cause already-deleted transactions to be loaded and reprocessed after a flush.

---

### [HDDS-12669](https://issues.apache.org/jira/browse/HDDS-12669) — ContainerSet recoveringContainerMap race condition

Fixed a race condition in ContainerSet#recoveringContainerMap that could cause incorrect container recovery state during datanode restarts.

---

### [HDDS-15552](https://issues.apache.org/jira/browse/HDDS-15552) — Prometheus scraping fails on Ozone metrics

Fixed Prometheus metrics endpoints failing to scrape Ozone services because Ratis event strings were published as metric names containing invalid characters.

---

### [HDDS-11772](https://issues.apache.org/jira/browse/HDDS-11772) — Recon reports incorrect Ozone used capacity

Fixed incorrect Ozone used capacity reporting in Recon that could show vastly inflated values compared to the actual data written.

---

## Changelog

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

### Fixed

- Fixed SCM deserialization failure for empty lists in Ratis log entries. ([HDDS-15783](https://issues.apache.org/jira/browse/HDDS-15783))
- Fixed SCM crashes from uncaught InvalidStateTransitionException during container state updates. ([HDDS-15578](https://issues.apache.org/jira/browse/HDDS-15578))
- Fixed EC offline reconstruction data loss for idle RECOVERING containers. ([HDDS-15791](https://issues.apache.org/jira/browse/HDDS-15791))
- Fixed gRPC client shutdown performance regression under parallel read workloads. ([HDDS-15849](https://issues.apache.org/jira/browse/HDDS-15849))
- Fixed datanode transaction iterator race condition after flush. ([HDDS-15665](https://issues.apache.org/jira/browse/HDDS-15665))
- Fixed ContainerSet#recoveringContainerMap race condition during datanode restarts. ([HDDS-12669](https://issues.apache.org/jira/browse/HDDS-12669))
- Fixed Prometheus metrics scraping failures caused by invalid Ratis event metric names. ([HDDS-15552](https://issues.apache.org/jira/browse/HDDS-15552))
- Fixed incorrect Ozone used capacity reporting in Recon. ([HDDS-11772](https://issues.apache.org/jira/browse/HDDS-11772))

### Changed

- Upgraded Netty to 4.1.135. ([HDDS-15722](https://issues.apache.org/jira/browse/HDDS-15722))
- Upgraded Netty to 4.1.136. ([HDDS-15900](https://issues.apache.org/jira/browse/HDDS-15900))
- Upgraded BouncyCastle to 1.85. ([HDDS-15974](https://issues.apache.org/jira/browse/HDDS-15974))
- Upgraded Protobuf to 3.25.9. ([HDDS-15674](https://issues.apache.org/jira/browse/HDDS-15674))
- Upgraded Ratis thirdparty to 1.0.11. ([HDDS-15727](https://issues.apache.org/jira/browse/HDDS-15727))

## Downloads

- [Download tar.gz](https://www.apache.org/dyn/closer.cgi/ozone/2.2.1/ozone-2.2.1.tar.gz) ([checksum](https://downloads.apache.org/ozone/2.2.1/ozone-2.2.1.tar.gz.sha512), [signature](https://downloads.apache.org/ozone/2.2.1/ozone-2.2.1.tar.gz.asc))
- [Download src](https://www.apache.org/dyn/closer.cgi/ozone/2.2.1/ozone-2.2.1-src.tar.gz) ([checksum](https://downloads.apache.org/ozone/2.2.1/ozone-2.2.1-src.tar.gz.sha512), [signature](https://downloads.apache.org/ozone/2.2.1/ozone-2.2.1-src.tar.gz.asc))

## Documentation

- [Ozone 2.2.1 Documentation](https://ozone.apache.org/docs/2.2.1)

**Release Date:** TBD
1 change: 1 addition & 0 deletions versions.json
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[
"2.2.1",
"2.2.0",
"2.1.1"
]
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