小编kar*_*thi的帖子

    fs.open('input.txt', 'r+', function(err, fd) {
       console.log(fd);
       if (err) {
           return console.error(err);
       }
    })

什么是fd,为什么当我使用console.log()打印它时它给出3;

我正在使用以下代码使用Chart js插件生成折线图，其中我面临的问题是X轴值重复两次。

function newDate(days) {
    return moment().add(days, 'd').format('MM/DD');
}

var painChartContext = document.getElementById('pain_chart');
    var painChart = new Chart(painChartContext, {
        type: 'line',
        data: {
            labels: [newDate(-7), newDate(-6), newDate(-5), newDate(-4), newDate(-3), newDate(-2), newDate(-1)],
            datasets: [{
                label: "Pain",
                data: [8, 9, 7, 3, 10, 3, 4],
                fill: false,
                borderColor: '#b71705',
                spanGaps: true
            }]
        },
        options: {
            scales: {
                xAxes: [{
                    type: 'time',
                    time: {
                        displayFormats: {
                            'millisecond': 'MM/DD',
                            'second': 'MM/DD',
                            'minute': 'MM/DD',
                            'hour': 'MM/DD',
                            'day': 'MM/DD',
                            'week': 'MM/DD',
                            'month': 'MM/DD',
                            'quarter': 'MM/DD',
                            'year': …

尝试在 ubuntu 14.04 上安装 cloudera 时出现以下错误。

Installation failed. Failed to receive heartbeat from agent.
Ensure that the host's hostname is configured properly.
Ensure that port 7182 is accessible on the Cloudera Manager Server (check firewall rules).
Ensure that ports 9000 and 9001 are not in use on the host being added.
Check agent logs in /var/log/cloudera-scm-agent/ on the host being added. (Some of the logs can be found in the installation details).
If Use TLS Encryption for Agents is enabled …