db: add additional logs to the compaction picker

[bananabrick]

No description provided.

[cockroach-teamcity]

This change is 

[bananabrick]

Reviewable status: 0 of 1 files reviewed, 2 unresolved discussions (waiting on @sumeerbhola)

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compaction_picker.go line 1104 at r1 (raw file):

		info.score = fileScore
	}
	info.origScore = info.score

Just used for logging, but we never set it for L0. Makes the logs confusing.

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compaction_picker.go line 1280 at r1 (raw file):

					p.vers.Levels[info.level].Iter(),
				))),
				humanize.Bytes.Int64(int64(totalSize(

Useful to see the actual size of the level in the logs.

[sumeerbhola]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @bananabrick)

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compaction_picker.go line 1280 at r1 (raw file):

Previously, bananabrick (Arjun Nair) wrote…

Useful to see the actual size of the level in the logs.

We should not be using totalCompensatedSize and totalSize here since they are linear in the number of files in the level. We should do what calculateScores does:

int64(levelCompensatedSize(p.vers.Levels[level]))

p.levelSizes[level]

and probably do the sizeAdjust logic too. We could make calculateScores return the sizeAdjust and use it here.