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List of security features that have been worked upon in Hadoop 3.0

The following is the a of the JIRAs that have been solved or worked upon with the Hadoop 3.0 release:

AliyunOSS: update oss-sdk version to 3.0.0 MajorResolvedFixed:

Issue Type	Issue key	Issue ID	Parent ID	Summary
Bug	`HADOOP-15866`	`13192984`		Renamed `HADOOP_SECURITY_GROUP_SHELL_COMMAND_TIMEOUT` keys break compatibility
Task	`HADOOP-15816`	`13189089`		Upgrade Apache ZooKeeper version due to security concerns
Bug	`HADOOP-15861`	`13192122`		Move `DelegationTokenIssuer` to the right path
Bug	`HADOOP-15523`	`13164833`		Shell command timeout given is in seconds whereas it is taken as millisec while scheduling
Improvement	`HADOOP-15609 ...`

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