Can writing to log files cause write conflicts?

Question

I have a web server that host several PHP applications and I want to know if its possible to encounter a write conflict under heavy normal/traffic when writing log details to a text file. In my case all applications using the same log file. If the possibility is high please give advises on how it could be reduced or avoided.

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Answer 1

To avoid any issues you need to lock the file so only one application at a time is writing to the file. With no exceptions - you need to have a lock.

If you have really loaded application(s) - you could choose some non-blocking logging daemon or storage