add command line options for compact block threshold and gc verbose (#557)

- Feature: Added new options to zenserver for GC V2
  - `--gc-compactblock-threshold` GCV2 - how much of a compact block should be used to skip compacting the block, default is 90%
  - `--gc-verbose` GCV2 - enable more verbose output when running a GC pass
- Feature: Added new options to `zen gc` command for GC V2
  - `--compactblockthreshold` GCV2 - how much of a compact block should be used to skip compacting the block, default is 90%
  - `--verbose` GCV2 - enable more verbose output when running a GC pass
- Feature: Added new parameters for endpoint `admin/gc` (PUT)
  - `compactblockthreshold` GCV2 - how much of a compact block should be used to skip compacting the block, default is 90%
  - `verbose` GCV2 - enable more verbose output when running a GC pass

1 files changed, 16 insertions, 0 deletions

diff --git a/src/zenserver/admin/admin.cpp b/src/zenserver/admin/admin.cpp
index 0b302c36e..f1d9f8d7c 100644
--- a/src/zenserver/admin/admin.cpp
+++ b/src/zenserver/admin/admin.cpp
@@ -219,6 +219,9 @@ HttpAdminService::HttpAdminService(GcScheduler&	   Scheduler,
 				Response << "DiskSizeSoftLimit" << NiceBytes(State.Config.DiskSizeSoftLimit);
 				Response << "MinimumFreeDiskSpaceToAllowWrites" << NiceBytes(State.Config.MinimumFreeDiskSpaceToAllowWrites);
 				Response << "LightweightInterval" << ToTimeSpan(State.Config.LightweightInterval);
+				Response << "UseGCVersion" << ((State.Config.UseGCVersion == GcVersion::kV1) ? "1" : "2");
+				Response << "CompactBlockUsageThresholdPercent" << State.Config.CompactBlockUsageThresholdPercent;
+				Response << "Verbose" << State.Config.Verbose;
 			}
 			Response.EndObject();
 			Response << "AreDiskWritesBlocked" << State.AreDiskWritesBlocked;
@@ -326,6 +329,19 @@ HttpAdminService::HttpAdminService(GcScheduler&	   Scheduler,
 				GcParams.ForceGCVersion = GcVersion::kV2;
 			}
 
+			if (auto Param = Params.GetValue("compactblockthreshold"); Param.empty() == false)
+			{
+				if (auto Value = ParseInt<uint32_t>(Param))
+				{
+					GcParams.CompactBlockUsageThresholdPercent = Value.value();
+				}
+			}
+
+			if (auto Param = Params.GetValue("verbose"); Param.empty() == false)
+			{
+				GcParams.Verbose = Param == "true"sv;
+			}
+
 			const bool Started = m_GcScheduler.TriggerGc(GcParams);
 
 			CbObjectWriter Response;