try {
AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
tableName);
protocol.grant(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, null,
Permission.Action.READ, Permission.Action.WRITE));
protocol.revoke(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, null));
protocol.revoke(new UserPermission(Bytes.toBytes(gblUser.getShortName())));
} finally {
acl.close();
}