Apache Accumulo 2.1.6

04 Jul 2026

These are draft release notes for a future release of Accumulo!
Please view the latest release notes.

This version is a current Long Term Maintenance (LTM) release.

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

#6461 Hadoop minimum compatibility was changed from 3.0.x to 3.3.x to make use of a new API for opening files.
#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

#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 for guidance.

Useful Links

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