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.
