security.client.protocol.acl * ACL for ClientProtocol, which is used by user code via the DistributedFileSystem. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed. security.client.datanode.protocol.acl * ACL for ClientDatanodeProtocol, the client-to-datanode protocol for block recovery. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed. security.datanode.protocol.acl * ACL for DatanodeProtocol, which is used by datanodes to communicate with the namenode. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed. security.inter.datanode.protocol.acl * ACL for InterDatanodeProtocol, the inter-datanode protocol for updating generation timestamp. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed. security.namenode.protocol.acl * ACL for NamenodeProtocol, the protocol used by the secondary namenode to communicate with the namenode. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed. security.inter.tracker.protocol.acl * ACL for InterTrackerProtocol, used by the tasktrackers to communicate with the jobtracker. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed. security.job.submission.protocol.acl * ACL for JobSubmissionProtocol, used by job clients to communciate with the jobtracker for job submission, querying job status etc. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed. security.task.umbilical.protocol.acl * ACL for TaskUmbilicalProtocol, used by the map and reduce tasks to communicate with the parent tasktracker. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed. security.refresh.policy.protocol.acl * ACL for RefreshAuthorizationPolicyProtocol, used by the dfsadmin and mradmin commands to refresh the security policy in-effect. The ACL is a comma-separated list of user and group names. The user and group list is separated by a blank. For e.g. "alice,bob users,wheel". A special value of "*" means all users are allowed.