# Amazon EMR 7.2.0 - Hadoop release notes
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## Amazon EMR 7.2.0 - Hadoop changes
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| Type | Description | 
| --- | --- | 
| New Feature | [HADOOP-18850](https://issues.apache.org/jira/browse/HADOOP-18850): S3A: Enable dual-layer server-side encryption with AWS KMS keys | 
| New Feature | Support S3 Glacier read restored objects | 
| Improvement | Dynamically Scaling S3A maximum connections based upon the cores when running Spark Jobs | 
| Improvement | [HADOOP-18797](https://issues.apache.org/jira/browse/HADOOP-18797): Support Concurrent Writes With S3A Magic Committer | 
| Improvement | [HADOOP-19047](https://issues.apache.org/jira/browse/HADOOP-19047): Support InMemory Tracking Of S3A Magic Commits | 
| Improvement | Add "Export", "Publish" & "AbortPublish" method in MagicV2 Committer | 
| Improvement | Implement ReadFullyIntoBuffers FileSystem API in S3A | 
| Bug Fix | [HADOOP-18793](https://issues.apache.org/jira/browse/HADOOP-18793): S3A StagingCommitter does not clean up staging-uploads directory | 
| Upgrade | [HADOOP-19008](https://issues.apache.org/jira/browse/HADOOP-19008): S3A: update aws-sdk version to 2.21.41 | 
| Upgrade | [HADOOP-18613](https://issues.apache.org/jira/browse/HADOOP-18613): Upgrade ZooKeeper to version 3.8.3 | 

## Amazon EMR 7.2.0 - Hadoop features
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See the following list for new Hadoop features in Amazon EMR 7.2.0.
+ [ S3 glacier support to read restored objects](https://docs.aws.amazon.com/emr/latest/ReleaseGuide/emr-hadoop-read-restore-objects.html) – With Amazon EMR release 7.2.0 and higher, you can read restored Glacier objects from the S3 location of the table with the `S3A` protocol. This read operation ignores archived Glacier files if they still in progress of being restored.
+ Support concurrent writes with the S3A magic committer – Amazon EMR 7.2.0 introduces support for concurrent writes with the S3A magic committer. This feature was added to the OSS Hadoop community as part of [HADOOP-18797](https://issues.apache.org/jira/browse/HADOOP-18797).