2.1.6 relnotes

_posts/release/2026-07-04-accumulo-2.1.6.md

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+---
+title: Apache Accumulo 2.1.6
+sortableversion: '02.01.06'
+LTM: true
+draft: true
+---
+## About
+
+Apache Accumulo 2.1.6 is a patch release of the 2.1 LTM line. It contains bug
+fixes and minor enhancements. This version supersedes earlier 2.1 releases
+and users upgrading to 2.1 should upgrade directly to this version instead of
+any prior 2.1 release.
+
+## Notable Changes
+
+* {% ghi 6461 %} Hadoop minimum compatibility was changed from 3.0.x to 3.3.x
+to make use of a new API for opening files.
+* {% ghi 6460 %} Changes the API used for opening files that will reduce calls
+to the NameNode when the FileStatus has already been retrieved for the file.
+
+### Configuration Improvements
+
+### Notable Bug Fixes
+
+### Metrics Improvements
+
+### Other Improvements
+
+* {% ghi 6449 %} Modifies the Garbage Collector to use a server-side filter when
+processing candidate files.
+
+### Semver violations
+
+## Requirements
+
+Accumulo 2.1.6 now requires JDK 21 to build, but still supports Java 11 runtime.
+
+## Upgrading
+
+View the [Upgrading Accumulo documentation][upgrade] for guidance.
+
+## Useful Links
+
+* [All Changes since 2.1.5][all-changes]
+* [All tickets related to this release][milestone]
+
+
+[upgrade]: /docs/2.x/administration/upgrading
+[milestone]: https://github.com/apache/accumulo/milestone/23
+[all-changes]: https://github.com/apache/accumulo/compare/rel/2.1.5...apache:rel/2.1.6