Queue file writes

[NV]

Let's say we have 3 request happens almost at the same time:

request #1
|
r1
      r2
           r3

We begin writing to the file when request event 'end' fires. Writing to the file takes much more time than processing a request (parse HTTP headers and stuff):

begin writing   end writing
   |            |
r1-b------------e
      r2
           r3

Where is no need to write second request r2 — we're going to rewrite it anyway. We could just write the third r3 when the first is done:

begin writing   end writing
   |            |
r1-b------------e
      r2
           r3....b------------e

Or, we could stop writing the current request when the next one is available:

         stop writing
         |
r1-b-----s
      r2--b-s
          r3-b------------e