[ANNOUNCE] Apache Hadoop 3.3.0 release

[Brahma Reddy Battula <br...@apache.org>]

Greetings all,

It gives me great pleasure to announce that the Apache Hadoop community has
voted to release Apache Hadoop 3.3.0.

Apache Hadoop 3.3.0 is the first release of Apache Hadoop 3.3 line for the
year 2020,
which includes 2148 fixes since the previous Hadoop 3.2.0 release.


Of these fixes:
   - 525 in Hadoop Common
   - 804 in HDFS
   - 763 in YARN
   - 56 in MapReduce

Apache Hadoop 3.3.0 contains a number of significant features and
enhancements.A few of them are noted as below.


- *Support ARM:* This is the first release to support ARM architectures

- *Upgrade protobuf from 2.5.0 : *Protobuf upgraded to 3.7.1 as
protobuf-2.5.0 reached EOL.

- *S3A Enhancements : *Lots of enhancements to the S3A code including
Delegation Token support, better handling of 404 caching, S3guard
performance, resilience improvements

- *ABFS Enhancements :* Address issues which surface in the field and tune
things which need tuning, add more tests where appropriate.Improve docs,
especially troubleshooting.

- *Tencent Cloud COS File System Implementation: *Tencent cloud is top
2 cloud vendors in China market and the object store COS is widely
used among China’s cloud users. COSN filesytem to support Tencent
cloud COS natively in Hadoop.

-  *Java11 Runtime Support* : Java 11 runtime support is completed.

- *HDFS RBF stabilizatio**n*: HDFS Router now supports security. Also
contains many bug fixes and improvements.

- *DNS Resolution to support Nameservices to IP Support:*DFS clients can
use a single domain name to discover servers (namenodes/routers/observers)
instead of explicitly listing out all hosts in the config

*- Scheduling of opportunistic containers :  S*cheduling of opportunistic
container through the central RM (YARN-5220), through distributed
scheduling (YARN-2877), as well as the scheduling of containers based on
actual node utilization (YARN-1011) and the container
promotion/demotion (YARN-5085).

*- Application Catalog for YARN applications: **Application catalog
system which provides an editorial and search interface for YARN
applications.*This improves the usability of YARN for managing the
life cycle of applications.

* For major changes included in Hadoop 3.3 line, please refer to Hadoop3.3.0
main page [1].


* For more details about fixes in 3.3.0 release, please read the CHANGELOG
[2] and RELEASENOTES [3].

The release news is posted on the Hadoop website too, you can go to the
downloads section directly [4].

Many thanks to everyone who contributed to the release, and everyone in the
Apache Hadoop community! This release is a direct result of your great
contributions.

Many thanks to Vinayakumar B who helped in this release process.

[1] https://hadoop.apache.org/docs <https://hadoop.apache.org/docs/r3.2.0/>
[2]
https://hadoop.apache.org/docs/r3.3.0/hadoop-project-dist/hadoop-common/release/3.3.0/CHANGELOG.3.3.0.html
[3]
https://hadoop.apache.org/docs/r3.3.0/hadoop-project-dist/hadoop-common/release/3.3.0/RELEASENOTES.3.3.0.html
[4] https://hadoop.apache.org/rele <https://hadoop.apache.org/releases.html>
ases.html





Regards,
Brahma Reddy Battula