EventEmitter memory leak detected

1

Whenever I start Ember, I get an EventEmitter memory leak. It doesn’t seem to affect anything, but I’m wondering if there’s something I can do to get rid of the error

% ember serve
(node) warning: possible EventEmitter memory leak detected. 11 exit listeners added. Use emitter.setMaxListeners() to increase limit.
Trace
    at process.addListener (events.js:239:17)
    at Object.<anonymous> (/Users/denchen/dev/ops-ui/node_modules/ember-cli-babel/node_modules/broccoli-babel-transpiler/node_modules/broccoli-merge-trees/node_modules/can-symlink/node_modules/tmp/lib/tmp.js:449:9)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/Users/denchen/dev/ops-ui/node_modules/ember-cli-babel/node_modules/broccoli-babel-transpiler/node_modules/broccoli-merge-trees/node_modules/can-symlink/index.js:1:73)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
   at Object.<anonymous> (/Users/denchen/dev/ops-ui/node_modules/ember-cli-babel/node_modules/broccoli-babel-transpiler/node_modules/broccoli-merge-trees/index.js:9:18) 
Environment: development
Livereload server on http://localhost:49153
Serving on http://localhost:3000/

Build successful - 6821ms.

I’m seeing this issue on OSX with Node 4.4.5 as well as RedHat with Node 0.12. These are the possibly relevant packages (there are a bunch others, but I don’t think they have anything to do with the issue):

"broccoli-asset-rev": "^2.4.2",
"ember-cli": "2.5.0",
"ember-cli-app-version": "^1.0.0",
"ember-cli-babel": "^5.1.6",
"ember-cli-dependency-checker": "^1.2.0",
"ember-cli-release": "0.2.8",
"ember-data": "^2.5.0",
"ember-load-initializers": "^0.5.1",
"ember-resolver": "^2.0.3",
"loader.js": "^4.0.1"

I’m not even sure where to start looking to debug this issue.

2

add a issue Issues · emberjs/ember.js · GitHub

3

This issue was discussed here: https://github.com/babel/ember-cli-babel/issues/76#issuecomment-226306507

And subsequently fixed here: https://github.com/ember-cli/ember-cli/pull/5987

According to Stefan Penner, the fix should roll out into the next beta sometime next week.

4

For latest version NodeJS we need to add below line at very starting of your server file.

require('events').EventEmitter.defaultMaxListeners = Infinity;

For Older version

require('events').EventEmitter.defaultMaxListeners = 0;

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