Skip frequently updated files

[Freaky]

Files that get updated a lot, particularly if they're large, are poor candidates for compaction.

An obvious simple heuristic that seems likely to be relatively effective is to check file modification time, and simply have a configurable cutoff - if it's changed in the past n days, skip it. Tiering this by file size might also make sense - frequently decompressing and recompressing a small file is much less costly than a large one.

This sort of thing will be more important should Compactor migrate to a background system service with patrol compactions.

[alpe12]

Yeah, I was going to suggest this. Even without tiering an option to set this cutoff would be very useful.

[alpe12]

@Freaky Please, take a look at adding this cutoff by modified time. Thanks.

[Freaky]

Will be getting to it soon!

[Freaky]

What I said but really this time.