2.1.5 draft release notes (#476)

Author: dlmarion

_posts/release/2026-04-03-accumulo-2.1.5.md

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+---
+title: Apache Accumulo 2.1.5
+sortableversion: '02.01.05'
+LTM: true
+draft: true
+---
+## About
+
+Apache Accumulo 2.1.5 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 6160 %} Accumulo 2.1.5 requires JDK 21 to build. For runtime the minimum
+required JDK version is 11.
+
+{% ghi 6156 %} Scan Servers can now be used to scan offline tables.
+
+{% ghi 6040 %} {% ghi 6075 %} Prior to 2.1.5 iterators that had the same priority would execute
+in a non-deterministic order. In 2.1.5 the iterators with the same priority will
+execute in the lexicographical order of the name property.
+
+{% 6146 %} Added Scan Server property that allows user to control which tables
+are allowed to be used with Scan Servers.
+
+{% 5998 %} Added property that allows user to specify whether or not RFiles should
+be shuffled when reading from a Tablet to try and reduce the number of scan threads
+that are waiting on the same file to opened.
+
+### Configuration Improvements
+
+### Notable Bug Fixes
+
+{% ghi 6148 %} Fixed shell commands `grep` and `deletemany` to honor the context
+classloader option.
+
+{% ghi 5960 %} Fixed a bug when `table.file.ec` property set to `inherit`.
+
+{% ghi 6029 %} Modified Monitor tables to support 'all' size option.
+
+{% ghi 5989 %} Adds a new log message in the Compaction Coordinator that will
+periodically log summary information to include number of compactions running for
+each table, the number of compactor, queued compactions (max 100), and running compactions
+for each compaction queue.
+
+{% ghi 5856 %} Modified Shell to stop removing backslash characters.
+
+{% ghi 5963 %} Enable reloading of the `general.server.iter.opts.compression`
+property so that changes don't require process restart.
+
+{% ghi 5888 %} Fail the `accumulo upgrade --prepare` command when table properties
+are set in the site configuration.
+
+### Metrics Improvements
+
+### Other Improvements
+
+{% ghi 6051 %} `shell fate --delete` command will remove the fate transaction id
+from the table\_locks directory in ZooKeeper to match the delete behavior of the
+`admin fate --delete` command.
+
+{% ghi 6064 %} Updated log4j dependency to version 2.25.3.
+
+{% ghi 6067 %} Fixed `accumulo-cluster prune` bug with Scan Servers.
+
+{% ghi 5983 %} Added `-v` option to shell `getsplits` command to print split
+information that matches the supplied obfuscated extent.
+
+{% ghi 5928 %} Converted Scan Servers to use Rendezvous hashing.
+
+{% ghi 6014 %} Modified Fate to exit normally when Manager shut down instead
+of failing the transaction.
+
+{% ghi 6005 %} Added compaction output tmp file name to pre-compaction log message.
+
+### Semver violations
+
+## Requirements
+
+Accumulo 2.1.5 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 2.1.4][all-changes]
+* [All tickets related to this release][milestone]
+
+
+[upgrade]: /docs/2.x/administration/upgrading
+[milestone]: https://github.com/apache/accumulo/milestone/22
+[all-changes]: https://github.com/apache/accumulo/compare/rel/2.1.4...apache:rel/2.1.5