angular - What are zone turns? -

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i encountered following error in angular2 application.

 warning: application taking longer 2000 zone turns.

my question: 'zone turns', why warn me when above 2000? (i know can change limit, then, why this?)

this error produce angular2/universal. when zones microtask queue processed , after processing 2000 tasks queue there still pending tasks. might caused lots of async work enqueues lots of async tasks. angular expects queue become empty.

https://github.com/angular/universal/issues/377#issuecomment-215229702

you can set maxzoneturns 10000 if or higher

the source error created https://github.com/angular/universal/blob/9508ac03650ca0439192b8ed49ce8f1e57b6be33/modules/universal/src/node/bootloader.ts#l158


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