Allow configuring the geometric factor used by the auto-compaction
algorithm whenever a new table is appended to the stack of tables.
Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
Documentation/config/reftable.txt | 10 ++++++++++
refs/reftable-backend.c | 5 +++++
2 files changed, 15 insertions(+)
diff --git a/Documentation/config/reftable.txt b/Documentation/config/reftable.txt
index 6e4466f3c5..1c381dda04 100644
--- a/Documentation/config/reftable.txt
+++ b/Documentation/config/reftable.txt
@@ -37,3 +37,13 @@ reftable.indexObjects::
are a reverse mapping of object ID to the references pointing to them.
+
The default value is `true`.
+
+reftable.geometricFactor::
+ Whenever the reftable backend appends a new table to the table it
+ performs auto compaction to ensure that there is only a handful of
+ tables. The backend does this by ensuring that tables form a geometric
+ sequence regarding the respective sizes of each table.
++
+By default, the geometric sequence uses a factor of 2, meaning that for any
+table, the next-biggest table must at least be twice as big. A maximum factor
+of 256 is supported.
diff --git a/refs/reftable-backend.c b/refs/reftable-backend.c
index 5298fcef6e..657d227c12 100644
--- a/refs/reftable-backend.c
+++ b/refs/reftable-backend.c
@@ -252,6 +252,11 @@ static int reftable_be_config(const char *var, const char *value,
} else if (!strcmp(var, "reftable.indexobjects")) {
opts->skip_index_objects = !git_config_bool(var, value);
return 0;
+ } else if (!strcmp(var, "reftable.geometricfactor")) {
+ unsigned long factor = git_config_ulong(var, value, ctx->kvi);
+ if (factor > UINT8_MAX)
+ die("reftable geometric factor cannot exceed %u", (unsigned)UINT8_MAX);
+ opts->auto_compaction_factor = factor;
}
return 0;
--
2.45.0
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