Thank you very much for your help in verifying this version! We will use
version 3.5.0 for fix jira in the future.

Best Regards,
Shilun Fan.

 > wonderful! I'll be testing over the weekend

 > Meanwhile, new changes I'm putting in to trunk are tagged as fixed in
3.5.0
 > -correct?

 > steve


> On Thu, 11 Jan 2024 at 05:15, slfan1989 wrote:

> Hello all,
>
> We plan to release hadoop 3.4.0 based on hadoop trunk, which is the first
> hadoop 3.4.0-RC version.
>
> The RC is available at:
> https://home.apache.org/~slfan1989/hadoop-3.4.0-RC0-amd64/ (for amd64)
> https://home.apache.org/~slfan1989/hadoop-3.4.0-RC0-arm64/ (for arm64)
>
> Maven artifacts is built by x86 machine and are staged at
> https://repository.apache.org/content/repositories/orgapachehadoop-1391/
>
> My public key:
> https://dist.apache.org/repos/dist/release/hadoop/common/KEYS
>
> Changelog:
> https://home.apache.org/~slfan1989/hadoop-3.4.0-RC0-amd64/CHANGELOG.md
>
> Release notes:
> https://home.apache.org/~slfan1989/hadoop-3.4.0-RC0-amd64/RELEASENOTES.md
>
> This is a relatively big release (by Hadoop standard) containing about
2852
> commits.
>
> Please give it a try, this RC vote will run for 7 days.
>
> Feature highlights:
>
> DataNode FsDatasetImpl Fine-Grained Locking via BlockPool
> ----------------------------------------
> [HDFS-15180](https://issues.apache.org/jira/browse/HDFS-15180) Split
> FsDatasetImpl datasetLock via blockpool to solve the issue of heavy
> FsDatasetImpl datasetLock
> When there are many namespaces in a large cluster.
>
> YARN Federation improvements
> ----------------------------------------
> [YARN-5597](https://issues.apache.org/jira/browse/YARN-5597) brings many
> improvements, including the following:
>
> 1. YARN Router now boasts a full implementation of all relevant interfaces
> including the ApplicationClientProtocol,
> ResourceManagerAdministrationProtocol, and RMWebServiceProtocol.
> 2. Enhanced support for Application cleanup and automatic offline
> mechanisms for SubCluster are now facilitated by the YARN Router.
> 3. Code optimization for Router and AMRMProxy was undertaken, coupled with
> improvements to previously pending functionalities.
> 4. Audit logs and Metrics for Router received upgrades.
> 5. A boost in cluster security features was achieved, with the inclusion
of
> Kerberos support.
> 6. The page function of the router has been enhanced.
>
> Upgrade AWS SDK to V2
> ----------------------------------------
> [HADOOP-18073](https://issues.apache.org/jira/browse/HADOOP-18073)
> The S3A connector now uses the V2 AWS SDK. This is a significant change at
> the source code level.
> Any applications using the internal extension/override points in the
> filesystem connector are likely to break.
> Consult the document aws\_sdk\_upgrade for the full details.
>
> hadoop-thirdparty will also provide the new RC0 soon.
>
> Best Regards,
> Shilun Fan.
>

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