What about living the file timestamps as they are and using
an additional file per index that contains nothing but a counter (type long)
which gets incremented everytime the index is changed (SegmentReader and
IndexWriter). I could implement this.
I think this is a good idea and would love to see an implementation. My guess is that you would do something like add a file called "version" which contains nothing but this long. Alternately, you could add the version at the end of the "segments" file or something. Then all of the IndexReader lastModified methods could be changed to return the value of the version rather than a date. For back-compatibility, the version could in fact be the millisecond time.
Is that the sort of thing you're thinking of?
Doug
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