public static ListMultimap<String, UserPermission> getNamespacePermissions(Configuration conf,
    String namespace) throws IOException {
    return getPermissions(conf, Bytes.toBytes(toNamespaceEntry(namespace)), null, null, null, null,
      false);
  }
Load all permissions from the region server holding {@code _acl_}, primarily intended for
testing purposes.
hbase-server/src/main/java/org/apache/hadoop/hbase/security/access/PermissionStorage.java