do not call SyncWAL() on Windows, as it does not work

arangod/RocksDBEngine/RocksDBEngine.cpp

@@ -974,15 +974,22 @@ std::pair<TRI_voc_tick_t, TRI_voc_cid_t> RocksDBEngine::mapObjectToCollection(
   return it->second;
 }
 
-Result RocksDBEngine::createLoggerState(TRI_vocbase_t* vocbase,
-                                        VPackBuilder& builder) {
-  Result res;
-
+bool RocksDBEngine::syncWal() {
+#ifdef _WIN32
+  // SyncWAL always reports "not implemented" on Windows
+  return true;
+#else
   rocksdb::Status status = _db->GetBaseDB()->SyncWAL();
   if (!status.ok()) {
-    res = rocksutils::convertStatus(status).errorNumber();
-    return res;
+    return false;
   }
+  return true;
+#endif
+}
+
+Result RocksDBEngine::createLoggerState(TRI_vocbase_t* vocbase,
+                                        VPackBuilder& builder) {
+  syncWal();
 
   builder.add(VPackValue(VPackValueType::Object));  // Base
   rocksdb::SequenceNumber lastTick = _db->GetLatestSequenceNumber();
@@ -1026,7 +1033,7 @@ Result RocksDBEngine::createLoggerState(TRI_vocbase_t* vocbase,
 
   builder.close();  // base
 
-  return res;
+  return Result();
 }
 
 void RocksDBEngine::determinePrunableWalFiles(TRI_voc_tick_t minTickToKeep) {

arangod/RocksDBEngine/RocksDBEngine.h

@@ -278,6 +278,7 @@ class RocksDBEngine final : public StorageEngine {
   static std::string const FeatureName;
   RocksDBCounterManager* counterManager() const;
   RocksDBReplicationManager* replicationManager() const;
+  bool syncWal();
 
  private:
   /// single rocksdb database used in this storage engine

arangod/RocksDBEngine/RocksDBRestExportHandler.cpp

@@ -229,15 +229,7 @@ void RocksDBRestExportHandler::createCursor() {
       options, "flush", false);
 
   if (flush) {
-    rocksdb::TransactionDB* db =
-        static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->db();
-
-    rocksdb::Status status = db->GetBaseDB()->SyncWAL();
-
-    if (!status.ok()) {
-      Result res = rocksutils::convertStatus(status);
-      THROW_ARANGO_EXCEPTION(res.errorNumber());
-    }
+    static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->syncWal();
 
     double flushWait =
         arangodb::basics::VelocyPackHelper::getNumericValue<double>(

arangod/RocksDBEngine/RocksDBRestReplicationHandler.cpp

@@ -1640,17 +1640,7 @@ void RocksDBRestReplicationHandler::handleCommandSync() {
   config._useCollectionId = useCollectionId;
 
   // wait until all data in current logfile got synced
-  // MMFilesLogfileManager::instance()->waitForSync(5.0);
-  rocksdb::TransactionDB* db =
-      static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->db();
-
-  rocksdb::Status status = db->GetBaseDB()->SyncWAL();
-  if (!status.ok()) {
-    Result res = rocksutils::convertStatus(status).errorNumber();
-    generateError(rest::ResponseCode::BAD, res.errorNumber(),
-                  res.errorMessage());
-    return;
-  }
+  static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->syncWal();
 
   InitialSyncer syncer(_vocbase, &config, restrictCollections, restrictType,
                        verbose);

arangod/RocksDBEngine/RocksDBRestWalHandler.cpp

@@ -140,20 +140,8 @@ void RocksDBRestWalHandler::flush() {
   if (ServerState::instance()->isCoordinator()) {
     res = flushWalOnAllDBServers(waitForSync, waitForCollector);
   } else {
-    rocksdb::TransactionDB* db =
-        static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->db();
-
     if (waitForSync) {
-      rocksdb::Status status = db->GetBaseDB()->SyncWAL();
-      if (!status.ok()) {
-        res = rocksutils::convertStatus(status).errorNumber();
-      }
-    }
-    if (waitForCollector) {
-      // does not make sense in rocksdb
-      /*rocksdb::FlushOptions flushOptions;
-      flushOptions.wait = true;
-      db->Flush(flushOptions);*/
+      static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->syncWal();
     }
   }
 

arangod/RocksDBEngine/RocksDBV8Functions.cpp

@@ -46,15 +46,7 @@ static void JS_FlushWal(v8::FunctionCallbackInfo<v8::Value> const& args) {
   TRI_V8_TRY_CATCH_BEGIN(isolate);
   v8::HandleScope scope(isolate);
 
-  rocksdb::TransactionDB* db =
-      static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->db();
-
-  rocksdb::Status status = db->GetBaseDB()->SyncWAL();
-
-  if (!status.ok()) {
-    Result res = rocksutils::convertStatus(status);
-    TRI_V8_THROW_EXCEPTION(res.errorNumber());
-  }
+  static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->syncWal();
 
   TRI_V8_RETURN_TRUE();
   TRI_V8_TRY_CATCH_END