org.apache.hadoop.security
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## Package `org.apache.hadoop.security`

Removed Classes
`Group` | A group to which a user belongs to.
`SecurityUtil.AccessControlList` | Class representing a configured access control list.
`UnixUserGroupInformation` | An implementation of UserGroupInformation in the Unix system
`User` | The username of a user.

Added Classes and Interfaces
`Credentials` | A class that provides the facilities of reading and writing secret keys and Tokens.
`GroupMappingServiceProvider` | An interface for the implementation of a user-to-groups mapping service used by Groups
`Groups` | A user-to-groups mapping service.
`JniBasedUnixGroupsMapping` | A JNI-based implementation of GroupMappingServiceProvider that invokes libC calls to get the group memberships of a given user.
`JniBasedUnixGroupsNetgroupMapping` | A JNI-based implementation of GroupMappingServiceProvider that invokes libC calls to get the group memberships of a given user.
`KerberosInfo` | Indicates Kerberos related information to be used
`KerberosName` | This class implements parsing and handling of Kerberos principal names.
`KerberosName.BadFormatString` |
`KerberosName.NoMatchingRule` |
`Krb5AndCertsSslSocketConnector` | Extend Jetty's SslSocketConnector to optionally also provide Kerberos5ized SSL sockets.
`Krb5AndCertsSslSocketConnector. Krb5SslFilter` | Filter that takes the Kerberos principal identified in the Krb5AndCertsSslSocketConnector and provides it the to the servlet at runtime setting the principal and short name.
`Krb5AndCertsSslSocketConnector. MODE` |
`NetgroupCache` | Class that caches the netgroups and inverts group-to-user map to user-to-group map
`RefreshUserMappingsProtocol` | Protocol use
`SaslInputStream` | A SaslInputStream is composed of an InputStream and a SaslServer (or SaslClient) so that read() methods return data that are read in from the underlying InputStream but have been additionally processed by the SaslServer (or SaslClient) object.
`SaslOutputStream` | A SaslOutputStream is composed of an OutputStream and a SaslServer (or SaslClient) so that write() methods first process the data before writing them out to the underlying OutputStream.
`SaslRpcClient` | A utility class that encapsulates SASL logic for RPC client
`SaslRpcServer` | A utility class for dealing with SASL on RPC server
`SaslRpcServer.AuthMethod` | Authentication method
`SaslRpcServer.QualityOfProtection` |
`SaslRpcServer.SaslDigestCallbackHandler` | CallbackHandler for SASL DIGEST-MD5 mechanism
`SaslRpcServer.SaslGssCallbackHandler` | CallbackHandler for SASL GSSAPI Kerberos mechanism
`SaslRpcServer.SaslStatus` |
`ShellBasedUnixGroupsMapping` | A simple shell-based implementation of GroupMappingServiceProvider that exec's the `groups` shell command to fetch the group memberships of a given user.
`ShellBasedUnixGroupsNetgroupMapping` | A simple shell-based implementation of GroupMappingServiceProvider that exec's the `groups` shell command to fetch the group memberships of a given user.
`UserGroupInformation. AuthenticationMethod` | existing types of authentications' methods
`UserGroupInformation. HadoopLoginModule` | A login module that looks at the Kerberos Unix or Windows principal and adds the corresponding UserName.

Changed Classes
SecurityUtil |
UserGroupInformation | User and group information for Hadoop.

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