Enable FDB to be built without RocksDB

fdbserver/CMakeLists.txt

@@ -215,8 +215,11 @@ add_library(fdb_sqlite STATIC
   sqlite/sqliteLimit.h
   sqlite/sqlite3.amalgamation.c)
 
-set(ROCKSDB_USE_STATIC_LIBS ON)
-find_package(RocksDB REQUIRED)
+if (SSD_ROCKSDB_EXPERIMENTAL)
+  add_definitions(-DSSD_ROCKSDB_EXPERIMENTAL)
+  set(ROCKSDB_USE_STATIC_LIBS ON)
+  find_package(RocksDB REQUIRED)
+endif()
 
 # Suppress warnings in sqlite since it's third party
 if(NOT WIN32)
@@ -232,7 +235,13 @@ target_include_directories(fdbserver PRIVATE
   ${CMAKE_BINARY_DIR}/bindings/c
   ${CMAKE_CURRENT_BINARY_DIR}/workloads
   ${CMAKE_CURRENT_SOURCE_DIR}/workloads)
-target_link_libraries(fdbserver PRIVATE fdbclient fdb_sqlite RocksDB)
+
+if (SSD_ROCKSDB_EXPERIMENTAL)
+  target_link_libraries(fdbserver PRIVATE fdbclient fdb_sqlite RocksDB)
+else()
+  target_link_libraries(fdbserver PRIVATE fdbclient fdb_sqlite)
+endif()
+
 if (GPERFTOOLS_FOUND)
   add_compile_definitions(USE_GPERFTOOLS)
   target_link_libraries(fdbserver PRIVATE gperftools)

fdbserver/KeyValueStoreRocksDB.actor.cpp

@@ -1,11 +1,18 @@
+#ifdef SSD_ROCKSDB_EXPERIMENTAL
+
 #include <rocksdb/env.h>
 #include <rocksdb/db.h>
 #include "flow/flow.h"
 #include "fdbrpc/AsyncFileCached.actor.h"
 #include "fdbserver/CoroFlow.h"
+
+#endif // SSD_ROCKSDB_EXPERIMENTAL
+
 #include "fdbserver/IKeyValueStore.h"
 #include "flow/actorcompiler.h" // has to be last include
 
+#ifdef SSD_ROCKSDB_EXPERIMENTAL
+
 namespace {
 
 class FlowLogger : public rocksdb::Logger, public FastAllocated<FlowLogger> {
@@ -383,6 +390,12 @@ struct RocksDBKeyValueStore : IKeyValueStore {
 
 } // namespace
 
+#endif // SSD_ROCKSDB_EXPERIMENTAL
+
 IKeyValueStore* keyValueStoreRocksDB(std::string const& path, UID logID, KeyValueStoreType storeType, bool checkChecksums, bool checkIntegrity) {
+#ifdef SSD_ROCKSDB_EXPERIMENTAL
 	return new RocksDBKeyValueStore(path, logID);
+#else
+	return keyValueStoreSQLite(path, logID, storeType, checkChecksums, checkIntegrity);
+#endif // SSD_ROCKSDB_EXPERIMENTAL
 }