Add seed nodes option to ydbd

[mregrock]

Changelog entry

Add seed nodes option to ydbd

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[mregrock]

BugBot run

[cursor]

Bug: Infinite Retry Loop in Config Fetching

The FetchConfigImpl method in TDefaultConfigClient contains an infinite retry loop. The while (!result.IsSuccess()) loop lacks a timeout or maximum retry limit. This causes the application to hang indefinitely during initialization if the provided address list is empty (e.g., from an empty seed nodes file []) or if all addresses are unreachable or consistently fail.

ydb/core/config/init/init.cpp#L466-L489

ydb/ydb/core/config/init/init.cpp

Lines 466 to 489 in e76b6fd

	static NYdb::NConfig::TFetchConfigResult FetchConfigImpl(
	const TGrpcSslSettings& grpcSettings,
	const TVector<TString>& addrs,
	const IEnv& env,
	IInitLogger& logger)
	{
	NYdb::NConfig::TFetchConfigResult result;
	while (!result.IsSuccess()) {
	for (const auto& addr : addrs) {
	logger.Out() << "Trying to fetch config from " << addr << Endl;
	result = TryToFetchConfig(grpcSettings, addr, env);
	if (result.IsSuccess()) {
	logger.Out() << "Success. Fetched config from " << addr << Endl;
	break;
	}
	logger.Err() << "Fetch config error: " << static_cast<NYdb::TStatus>(result) << Endl;
	}
	if (!result.IsSuccess()) {
	env.Sleep(TDuration::Seconds(1));
	}
	}
	return result;
	}

Fix in Cursor

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