# Amazon EMR 6.6.0 - Hadoop release notes
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## Amazon EMR 6.6.0 - Hadoop changes
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| Type | Description | 
| --- | --- | 
| Bug | Fixed duplicated records when reading BZip2 text files. | 
| Backport | [HADOOP-18136](https://issues.apache.org/jira/browse/HADOOP-18136): Verify FileUtils.unTar() handling of missing .tar files | 
| Backport | [HADOOP-17627](https://issues.apache.org/jira/browse/HADOOP-17627): Backport to branch-3.2 HADOOP-17371, HADOOP-17621, HADOOP-17625 to update Jetty to 9.4.39 | 
| Backport | [HADOOP-17655](https://issues.apache.org/jira/browse/HADOOP-17655): Upgrade Jetty to 9.4.40 | 
| Backport | [HADOOP-17796](https://issues.apache.org/jira/browse/HADOOP-17796): Upgrade jetty version to 9.4.43 | 
| Backport | [HADOOP-17661](https://issues.apache.org/jira/browse/HADOOP-17661): mvn versions:set fails to parse pom.xml | 
| Backport | [HADOOP-17236](https://issues.apache.org/jira/browse/HADOOP-17236): Bump up snakeyaml to 1.26 to mitigate CVE-2017-18640 | 
| Backport | [HADOOP-16717](https://issues.apache.org/jira/browse/HADOOP-16717): Remove GenericsUtil isLog4jLogger dependency on Log4jLoggerAdapter | 
| Backport | [HADOOP-17633](https://issues.apache.org/jira/browse/HADOOP-17633): Bump json-smart to 2.4.2 and nimbus-jose-jwt to 9.8 due to CVEs | 
| Backport | [HADOOP-17844](https://issues.apache.org/jira/browse/HADOOP-17844): Upgrade JSON smart to 2.4.7 | 
| Backport | [HADOOP-17972](https://issues.apache.org/jira/browse/HADOOP-17972): Backport HADOOP-17683 (Update commons-io to 2.8.0) for branch-3.2 | 
| Backport | [HADOOP-16555](https://issues.apache.org/jira/browse/HADOOP-16555): Update commons-compress to 1.19 | 
| Backport | [HADOOP-17370](https://issues.apache.org/jira/browse/HADOOP-17370): Upgrade commons-compress to 1.21 | 
| Backport | [HADOOP-17096](https://issues.apache.org/jira/browse/HADOOP-17096): Fix ZStandardCompressor input buffer offset | 
| Backport | [HADOOP-17112](https://issues.apache.org/jira/browse/HADOOP-17112): Whitespace not allowed in paths when saving files to s3a via committer | 
| Backport | [HADOOP-13500](https://issues.apache.org/jira/browse/HADOOP-13500): Synchronizing iteration of Configuration properties object | 
| Backport | [HDFS-14099](https://issues.apache.org/jira/browse/HDFS-14099): Unknown frame descriptor when decompressing multiple frames in ZStandardDecompressor | 
| Backport | [HDFS-16410](https://issues.apache.org/jira/browse/HDFS-16410): Insecure Xml parsing in OfflineEditsXmlLoader | 
| Backport | [HDFS-14498](https://issues.apache.org/jira/browse/HDFS-14498): LeaseManager can loop forever on the file for which create has failed | 
| Backport | [HDFS-15290](https://issues.apache.org/jira/browse/HDFS-15290): NPE in HttpServer during NameNode startup | 
| Backport | [HDFS-15293](https://issues.apache.org/jira/browse/HDFS-15293): Relax the condition for accepting a fsimage when receiving a checkpoint | 
| Backport | [HDFS-12979](https://issues.apache.org/jira/browse/HDFS-12979): StandbyNode should upload FsImage to ObserverNode after checkpointing | 
| Backport | [YARN-10538](https://issues.apache.org/jira/browse/YARN-10538): Add recommissioning nodes to the list of updated nodes returned to the AM | 
| Backport | [YARN-10472](https://issues.apache.org/jira/browse/YARN-10472): Backport YARN-10314 (YarnClient throws NoClassDefFoundError for WebSocketException with only shaded client jars) to branch-3.2 | 
| Backport | [YARN-9968](https://issues.apache.org/jira/browse/YARN-9968): Public Localizer is exiting in NodeManager due to NullPointerException | 
| Backport | [YARN-10651](https://issues.apache.org/jira/browse/YARN-10651): CapacityScheduler crashed with NPE in AbstractYarnScheduler.updateNodeResource() | 
| Backport | [YARN-9339](https://issues.apache.org/jira/browse/YARN-9339): Apps pending metric incorrect after moving app to a new queue | 
| Backport | [YARN-10438](https://issues.apache.org/jira/browse/YARN-10438): Handle null containerId in ClientRMService\#getContainerReport() | 
| Backport | [YARN-7266](https://issues.apache.org/jira/browse/YARN-7266): ATS 1.5 fails to start if RollingLevelDb files are corrupt or missing | 
| Backport | [YARN-9063](https://issues.apache.org/jira/browse/YARN-9063): ATS 1.5 fails to start if RollingLevelDb files are corrupt or missing | 
| Backport | [YARN-9848](https://issues.apache.org/jira/browse/YARN-9848): Revert YARN-4946 (RM should not consider an application as COMPLETED when log aggregation is not in a terminal state). |