doc: add note for fs.watch virtualized env
Fixes: https://github.com/nodejs/node/issues/6765 PR-URL: https://github.com/nodejs/node/pull/6809 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
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@ -1469,9 +1469,10 @@ to be notified of filesystem changes.
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* On Windows systems, this feature depends on `ReadDirectoryChangesW`.
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If the underlying functionality is not available for some reason, then
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`fs.watch` will not be able to function. For example, watching files or
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directories on network file systems (NFS, SMB, etc.) often doesn't work
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reliably or at all.
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`fs.watch` will not be able to function. For example, watching files or
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directories can be unreliable, and in some cases impossible, on network file
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systems (NFS, SMB, etc), or host file systems when using virtualization software
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such as Vagrant, Docker, etc.
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You can still use `fs.watchFile`, which uses stat polling, but it is slower and
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less reliable.
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