[ANNOUNCE] Apache Hadoop 3.3.6 release

[Wei-Chiu Chuang <we...@apache.org>]

On behalf of the Apache Hadoop Project Management Committee, I am pleased
to announce the release of Apache Hadoop 3.3.6.

It contains 117 bug fixes, improvements and enhancements since 3.3.5. Users
of Apache Hadoop 3.3.5 and earlier should upgrade to this release.

https://hadoop.apache.org/release/3.3.6.html
Feature highlights:

SBOM artifacts
----------------------------------------
Starting from this release, Hadoop publishes Software Bill of Materials
(SBOM) using
CycloneDX Maven plugin. For more information about SBOM, please go to
[SBOM](https://cwiki.apache.org/confluence/display/COMDEV/SBOM).

HDFS RBF: RDBMS based token storage support
----------------------------------------
HDFS Router-Router Based Federation now supports storing delegation tokens
on MySQL,
[HADOOP-18535](https://issues.apache.org/jira/browse/HADOOP-18535)
which improves token operation through over the original Zookeeper-based
implementation.


New File System APIs
----------------------------------------
[HADOOP-18671](https://issues.apache.org/jira/browse/HADOOP-18671) moved a
number of
HDFS-specific APIs to Hadoop Common to make it possible for certain
applications that
depend on HDFS semantics to run on other Hadoop compatible file systems.

In particular, recoverLease() and isFileClosed() are exposed through
LeaseRecoverable
interface. While setSafeMode() is exposed through SafeMode interface.

Many thanks to everyone who helped in this release by supplying patches,
reviewing them, helping get this release building and testing and
reviewing the final artifacts.

Weichiu