On Mar 8, 2011, at 2:12 , Linus wrote:
At a later stage in the code, the values of (say) Message A are
changed by the user. Is there a way of modifying only Message A and
updating the file on disk, without loading the composite Message C
updating the Message A and flushing entire contents to disk again?


Not really: protocol buffers are a variable length encoding, so changing Message A could change the length, so overwriting doesn't really work, at least not without additional checks and effort.

Evan

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