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Allow for caching of compaction scores

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Potentially reduce the overheads of scoring each file on every run.

The change also alters the default thresholds for compaction to favour longer runs (which will tend towards greater storage efficiency).
This commit is contained in:
Martin Sumner 2020-11-27 02:35:27 +00:00
parent e3bcd7eaec
commit b4c79caf7a
9 changed files with 153 additions and 17 deletions
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9
priv/leveled.schema
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@ -100,6 +100,13 @@
{datatype, integer}
]}.
%% @doc The number of times per day to score an individual file for compaction
{mapping, "leveled.compaction_scores_perday", "leveled.compaction_scores_perday", [
{default, 1},
{datatype, integer},
hidden
]}.
%% @doc Compaction Low Hour
%% The hour of the day in which journal compaction can start. Use Low hour
%% of 0 and High hour of 23 to have no compaction window (i.e. always compact
@ -143,7 +150,7 @@
%% then it is a candidate (e.g. in default case if 50% of space would be
%% recovered)
{mapping, "leveled.singlefile_compactionpercentage", "leveled.singlefile_compactionpercentage", [
{default, 50.0},
{default, 30.0},
{datatype, float},
hidden
]}.