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new ebd96388 add release notes for 2.1.3 (draft)
ebd96388 is described below
commit ebd963881d57108a0a6cd3c09d2b98411d48a4d6
Author: Ed Coleman <edcole...@apache.org>
AuthorDate: Wed Sep 20 17:34:14 2023 +0000
add release notes for 2.1.3 (draft)
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+---
+title: Apache Accumulo 2.1.3
+sortableversion: '02.01.03'
+draft: true
+LTM: true
+---
+## About
+
+Apache Accumulo 2.1.3 is a patch release of the 2.1 LTM line. It contains bug
+fixes and minor enhancements. This version supersedes 2.1.2. Users upgrading to
+2.1 should upgrade directly to this version instead of 2.1.2.
+
+Included here are some highlights of the most interesting bugs fixed and
+features added in 2.1.3. For the full set of changes, please see the commit
+history or issue tracker.
+
+### Notable Improvements
+
+Improvements that affect performance:
+
+* {% ghi 3722 %} Adds parameter {% plink general.filename.base.allocation %},
that allows the batch size
+ for unique filename allocation in ZooKeeper to be configurable. In a system
that requires large numbers
+ of unique names, larger batch sizes can reduce ZooKeeper contention because
more file names can be
+ reserved with a single ZooKeeper call.
+* {% ghi 3733 %} Avoid creating server side threads when failed writes are
cancelled. In versions 2.1.2
+ and earlier, the thrift close call creates a new thread to cancel the thrift
session. With 2.1.3, an
+ new thrift method is available to test if a session is reserved and deletes
it if it is not reserved
+ without creating an additional thread. If the new method is not available
it falls back to the previous
+ close method to preserve interoperability between 2.x versions.
+
+### Notable Bug Fixes
+
+* {% ghi 3721 %} Fixes issue with writes happening in a retry after batch
writer was closed. This
+ strengthens metadata consistency.
+* {% ghi 3749 %} Fixes issue where deleting a compaction pool with running
compactions would
+ leave the tserver in a bad state.
+* {% ghi 3748 %} Fixes bug where wal could remained locked if an exception
occurred.
+* {% ghi 3747 %} Adds validation to prevent possible deadlock when acquiring
wal locks.
+* {% ghi 3737 %} Use custom Transport to set Transport message and frame size.
This fixes
+ a bug where Accumulo would not change the max message size allowed.
+* {% ghi #608 %}, {% ghi 3755 %} Add validation to GC that checks that the
scanner used by GC to determine
+ candidates for deletion returned a complete row as a mitigation for {% ghi
#608 %} where
+ garbage collector removes file that are referenced and in-use.
+
+### Improvements that help with administration:
+
+* {% ghi 3697 %} Allow `ACCUMULO_JAVA_PREFIX` option in `accumulo-env.sh` so
it can be passed
+ as an array. This simplifies passing user options when starting Accumulo
processes, for example
+ `numactl` parameters.
+* {% ghi 3751 %} Added property {% plink rpc.backlog %} to configure backlog
size for
+ Thrift server sockets.
+* {% ghi 3745 %} Adds prefix to gc deletion log messages. This makes it easier
to isolate the deletion
+ actions of the garbage collector for analysis.
+* {% ghi 3724 %} Adds logging of transactions when metadata and in-memory
differences are detected.
+
+## Upgrading
+
+View the [Upgrading Accumulo documentation][upgrade] for guidance.
+
+## 2.1.2 GitHub Project
+
+[All tickets related to 2.1.3.][project]
+
+
+[upgrade]: /docs/2.x/administration/upgrading
+[project]: https://github.com/apache/accumulo/projects/30
