pgpool 4.2.4 recovery_node

/*
     * If the node is a standby node, read the specified WAL file
     * to perform recovery.
     */
    if (RECOVERY_ARCHIVE == recovery_type)
    {
        if (strlen(recovery_file) == 0)
        {
            /* recovery from pg_xlog directory */
            recovery_from_xlogdir = 1;
            ereport(LOG,
                    (errmsg("performing recovery from pg_xlog directory"),
                     errhidestmt(true)));
        }
        else
        {
            /* recovery from an archive */
            recovery_from_archive = 1;
            ereport(LOG,
                    (errmsg("performing recovery from archive"),
                     errhidestmt(true)));
        }
    }