BIND 10 #1704: log output mixed

[BIND 10 Development]

#1704: log output mixed
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                   Reporter:  jreed  |                 Owner:
                       Type:         |                Status:  new
  defect                             |             Milestone:
                   Priority:         |  Sprint-20120403
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  logging                            |           Sub-Project:  Core
                   Keywords:         |  Estimated Difficulty:  15
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by vorner):

 Hello

 I believe I can guess the reason. If there's a lot of logging or long
 message, the IO library could buffer the messages a little bit ‒
 especially if it is being output to a pipe or file through '>'. However,
 that could mean one process writes part of the message and wants to write
 the second part later (because the write call couldn't write everything at
 once, so it needed to retry). However, a different component have called
 its own write() in between and inserted the text in the middle. I heard
 this can be circumvented with files opened in „append“ mode and writing by
 blocks no bigger than some constant. But that is a magic.

 So we either need to output to different files or have some kind of
 synchronisation (if that was the actual problem, but I can't imagine
 anything else). Or maybe logging through a different logger process that
 would mix it all together, but that would likely be slow.

-- 
Ticket URL: <http://bind10.isc.org/ticket/1704#comment:8>
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