EMFILE exception when watching on Win7

[Jon Anderson]

On my Window 7 system, the "hexo server" command will usually crash with the EMFILE error. I say usually because if I run "hexo clean && hexo server" enough times then it eventually works. Below is my cmd shell dump...

C:\Users\andjon\Source\janderland>hexo server --debug
02:16:47.479 DEBUG Hexo version: 3.2.0
02:16:47.479 DEBUG Working directory: ~\Source\janderland
02:16:47.572 DEBUG Config loaded: ~\Source\janderland_config.yml
02:16:47.588 DEBUG Plugin loaded: hexo-renderer-marked
02:16:47.588 DEBUG Plugin loaded: hexo-generator-index
02:16:47.588 DEBUG Plugin loaded: hexo-generator-archive
02:16:47.588 DEBUG Plugin loaded: hexo-renderer-ejs
02:16:47.603 DEBUG Plugin loaded: hexo-generator-category
02:16:47.603 DEBUG Plugin loaded: hexo-generator-tag
02:16:47.635 DEBUG Plugin loaded: hexo-server
02:16:47.650 DEBUG Loading database.
02:16:47.650 INFO Start processing
02:16:48.430 DEBUG Theme config loaded.
02:16:48.430 DEBUG Processed: _config.yml
02:16:48.430 DEBUG Processed: source/css/foundation-icons.css
02:16:48.430 DEBUG Processed: source/css/foundation-icons.eot
02:16:48.446 DEBUG Processed: source/css/foundation-icons.ttf
02:16:48.446 DEBUG Processed: source/css/foundation-icons.woff
02:16:48.446 DEBUG Processed: source/css/jander.css
02:16:48.446 DEBUG Processed: source/js/index.js
02:16:48.446 DEBUG Processed: source/js/app.js
02:16:48.539 DEBUG Processed: layout/index.ejs
02:16:48.539 DEBUG Processed: layout/layout.ejs
02:16:48.555 DEBUG Processed: source/css/foundation.css
02:16:48.851 DEBUG Processed: layout/post.ejs
02:16:48.851 DEBUG Processed: source/css/foundation-icons.svg
02:16:48.961 DEBUG Processed: layout/_partials/css.ejs
02:16:48.961 DEBUG Processed: layout/_partials/js.ejs
02:16:48.961 DEBUG Processed: layout/_partials/list_posts.ejs
02:16:48.961 DEBUG Processed: _posts/Test.md
02:16:48.961 DEBUG Processed: _posts/This-is-a-dummy-post.md
02:16:48.961 DEBUG Processed: _posts/Heyo.md
02:16:48.961 DEBUG Processed: _posts/What-up-punks.md
fs.js:584
return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
^

Error: EMFILE: too many open files, open 'C:\Users\andjon\Source\janderland\node_modules\readdirp\stream-api.js'
at Error (native)
at Object.fs.openSync (fs.js:584:18)
at Object.fs.readFileSync (fs.js:431:33)
at Object.Module._extensions..js (module.js:421:20)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Module.require (module.js:367:17)
at require (internal/module.js:16:19)
at readdir (C:\Users\andjon\Source\janderland\node_modules\readdirp\readdirp.js:52:25)
at FSWatcher. (C:\Users\andjon\Source\janderland\node_modules\chokidar\lib\nodefs-handler.js:355:5)
at FSWatcher.NodeFsHandler._handleDir (C:\Users\andjon\Source\janderland\node_modules\chokidar\lib\nodefs-handler.js:406:18)
at FSWatcher. (C:\Users\andjon\Source\janderland\node_modules\chokidar\lib\nodefs-handler.js:455:19)
at FSWatcher. (C:\Users\andjon\Source\janderland\node_modules\chokidar\lib\nodefs-handler.js:460:16)
at FSReqWrap.oncomplete (fs.js:82:15)

I tested the exact same hexo site on my Macbook and an EMFILE error is never thrown.

Notice that the EMFILE error actually occur's during a require() call by the readdirp module. One possible solution could be to 'gracefulify' the fs module during the hexo-fs module's initialization...

var fs = require('graceful-fs'); var nodeFs = require('fs'); fs.gracefulify(nodeFs);

... though I haven't tested the effects this would have on performance.

[Brook]

Same problem, anyone can fix it?

[Abner Chou]

https://hexo.io/docs/troubleshooting.html#EMFILE-Error

Thanks for your feed back. Hexo won't handle system I/O. People also raising similar issue on windows bash microsoft/WSL#1126 . They provide some solution, hope that would help.