[Melbourne-pm] An intermittent problem with open for append
scottp at dd.com.au
Wed May 28 04:36:03 PDT 2008
There has been comment on is append safe or not.
NFS - Absolutely not. You will need to consider locking (which also
UNIX - Yes no problem BUT you must be under the internal buffer on the
system, and it is line bound. So multi line insert will not be in
order, but single lines will. This means you are totally safe doing an
append with single line log files, locally. Using the Sync and Buffer
changes Paul suggested won't improve the situation or make it any
safer. This is because you may have your two scripts hit the file the
same time - even if exactly the same time, the OS will put both lines
in without garbaling it - UNLESS you go over the buffer size (not sure
what that is, but 512 bytes would probably be safe guess).
Windows - Anyone know?
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