refactor comapactcas index (#443)

- Bugfix: Fix scrub messing up payload and access time in disk cache bucket when compacting index
- Improvement: Split up disk cache bucket index into hash lookup and payload array to improve performance
- Improvement: Reserve space up front for compact binary output when saving cache bucket manifest to improve performance

1 files changed, 5 insertions, 3 deletions

diff --git a/src/zenstore/compactcas.h b/src/zenstore/compactcas.h
index eff9cc135..c0cbbac32 100644
--- a/src/zenstore/compactcas.h
+++ b/src/zenstore/compactcas.h
@@ -77,6 +77,7 @@ private:
 	uint64_t			   ReadIndexFile(const std::filesystem::path& IndexPath, uint32_t& OutVersion);
 	uint64_t			   ReadLog(const std::filesystem::path& LogPath, uint64_t SkipEntryCount);
 	void				   OpenContainer(bool IsNewStore);
+	void				   CompactIndex(RwLock::ExclusiveLockScope&);
 
 	spdlog::logger& Log() { return m_Log; }
 
@@ -91,9 +92,10 @@ private:
 	std::filesystem::path		   m_BlocksBasePath;
 	BlockStore					   m_BlockStore;
 
-	RwLock																   m_LocationMapLock;
-	typedef tsl::robin_map<IoHash, BlockStoreDiskLocation, IoHash::Hasher> LocationMap_t;
-	LocationMap_t														   m_LocationMap;
+	RwLock												   m_LocationMapLock;
+	typedef tsl::robin_map<IoHash, size_t, IoHash::Hasher> LocationMap_t;
+	LocationMap_t										   m_LocationMap;
+	std::vector<BlockStoreDiskLocation>					   m_Locations;
 };
 
 void compactcas_forcelink();