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@@ -15,7 +15,7 @@
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Apache Hadoop ${project.version}
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================================
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-Apache Hadoop ${project.version} is an update to the Hadoop 3.3.x release branch.
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+Apache Hadoop ${project.version} is an update to the Hadoop 3.4.x release branch.
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Overview of Changes
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===================
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@@ -23,6 +23,29 @@ Overview of Changes
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Users are encouraged to read the full set of release notes.
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This page provides an overview of the major changes.
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+DataNode FsDatasetImpl Fine-Grained Locking via BlockPool
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+----------------------------------------
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+[HDFS-15180](https://issues.apache.org/jira/browse/HDFS-15180) Split FsDatasetImpl datasetLock via blockpool to solve the issue of heavy FsDatasetImpl datasetLock
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+When there are many namespaces in a large cluster.
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+
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+YARN Federation improvements
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+----------------------------------------
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+[YARN-5597](https://issues.apache.org/jira/browse/YARN-5597) brings many improvements, including the following:
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+
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+1. YARN Router now boasts a full implementation of all relevant interfaces including the ApplicationClientProtocol, ResourceManagerAdministrationProtocol, and RMWebServiceProtocol.
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+2. Enhanced support for Application cleanup and automatic offline mechanisms for SubCluster are now facilitated by the YARN Router.
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+3. Code optimization for Router and AMRMProxy was undertaken, coupled with improvements to previously pending functionalities.
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+4. Audit logs and Metrics for Router received upgrades.
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+5. A boost in cluster security features was achieved, with the inclusion of Kerberos support.
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+6. The page function of the router has been enhanced.
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+
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+Upgrade AWS SDK to V2
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+----------------------------------------
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+[HADOOP-18073](https://issues.apache.org/jira/browse/HADOOP-18073)
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+The S3A connector now uses the V2 AWS SDK. This is a significant change at the source code level.
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+Any applications using the internal extension/override points in the filesystem connector are likely to break.
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+Consult the document aws\_sdk\_upgrade for the full details.
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+
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Azure ABFS: Critical Stream Prefetch Fix
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----------------------------------------
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slfan1989