Some polling requests fail

NodeBB Development
  • @TheBronx
    Similar behavior for mine. But seems not the same reason, cause the failed requests are fast enough while there still exist a long request that succeed.
    It's NodeBB 1.1.0 and 1.4.8
    digital ocean 8G 4core machine

    Followed by my nginx config:

    upstream io_nodes {
    server {
        listen 80;
        return 301 https://$server_name$request_uri;
    server {
        # listen on ssl, deliver with speedy if possible
        listen 443 ssl;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;
        proxy_redirect off;
        gzip            on;
        gzip_min_length 1000;
        gzip_proxied    off;
        gzip_types      text/plain application/xml application/x-javascript text/css application/json;
        # Socket.IO Support
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        ssl on;
        # change this path!
        ssl_certificate /etc/nginx/ssl/ssl.crt;
        # change this path!
        ssl_certificate_key /etc/nginx/ssl/server.key;
        # enables all versions of TLS, but not SSLv2 or 3 which are weak and now deprecated.
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        # disables all weak ciphers
        ssl_ciphers 'AES128+EECDH:AES128+EDH';
        ssl_prefer_server_ciphers on;
        location @nodebb {
            # limit_req zone=allips burst=6 nodelay;
            proxy_pass http://io_nodes;
        location ~ ^/(images|language|sounds|templates|uploads|vendor|src\/modules|src\/client|nodebb\.min\.js|stylesheet\.css|admin\.css|js-enabled\.css|favicon\.ico) {
            root /home/lcnodebb/nodebb/public/;
            try_files $uri $uri/ @nodebb;
        location / {
            access_log /var/log/nginx/access_nodebb.log;
            error_log /var/log/nginx/error_nodebb.log;
            proxy_pass http://io_nodes;
  • @TheBronx

    I do agree you very much that the polling requests are causing an enormous load on the server. My machine is powerful enough holding 65000+user and 140000+ posts.

    But the load is heavy at peak time, and if I restart nodebb, it can not even recover until the peak was passed.

    Any idea on this? I was obsessed with this for long...

    I found that the ESTABLISHED connections are too large. Does that count for this issue?
    No matter peak time or valley time, this number almost seems the same.

    user@discuss:~$ netstat -n | grep -c ESTABLISHED

    and the ulimit:

    user@discuss:~$ ulimit -a
    core file size          (blocks, -c) 0
    data seg size           (kbytes, -d) unlimited
    scheduling priority             (-e) 0
    file size               (blocks, -f) unlimited
    pending signals                 (-i) 63711
    max locked memory       (kbytes, -l) 64
    max memory size         (kbytes, -m) unlimited
    open files                      (-n) 10000
    pipe size            (512 bytes, -p) 8
    POSIX message queues     (bytes, -q) 819200
    real-time priority              (-r) 0
    stack size              (kbytes, -s) 8192
    cpu time               (seconds, -t) unlimited
    max user processes              (-u) 63711
    virtual memory          (kbytes, -v) unlimited
    file locks                      (-x) unlimited

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