Method runGrvProbe

fdbclient/MultiVersionTransaction.actor.cpp:2153–2167

Runs a GRV probe on the cluster to determine if the client version is compatible with the cluster. Must be called from main thread

// Runs a GRV probe on the cluster to determine if the client version is compatible with the cluster.
// Must be called from main thread
void MultiVersionDatabase::LegacyVersionMonitor::runGrvProbe(Reference<MultiVersionDatabase::DatabaseState> dbState) {
	tr = db->createTransaction();
	Reference<LegacyVersionMonitor> self = Reference<LegacyVersionMonitor>::addRef(this);
	versionMonitor = mapThreadFuture<Version, Void>(tr->getReadVersion(), [self, dbState](ErrorOr<Version> v) {
		// If the version attempt returns an error, we regard that as a connection (except operation_cancelled)
		if (!v.isError() || v.getError().code() != error_code_operation_cancelled) {
			onMainThreadVoid([self, dbState]() {
				self->monitorRunning = false;
				dbState->protocolVersionChanged(self->client->protocolVersion);
			});
		}

		return v.map<Void>([](Version v) { return Void(); });
	});
}

void MultiVersionDatabase::LegacyVersionMonitor::close() {
	if (versionMonitor.isValid()) {