TCP documentation

[plutov]

Hi, I am using ClickHouse in Go, currently via HTTP, but I want TCP transport too. Do you have any documentation about it? Now I have this error (I am doing something wrong):

echo "SELECT 1" | nc localhost 9000
eDB::NetException/DB::NetException: Unexpected packet from client�0. clickhouse-server(StackTrace::StackTrace()+0xe) [0xfd7c7e]
1. clickhouse-server(DB::Exception::Exception(std::string const&, int)+0x1e) [0xf72a6e]
2. clickhouse-server(DB::TCPHandler::receiveHello()+0xa92) [0xf8de92]
3. clickhouse-server(DB::TCPHandler::runImpl()+0x1b8) [0xf90818]
4. clickhouse-server(DB::TCPHandler::run()+0x17) [0xf91957]
5. clickhouse-server(Poco::Net::TCPServerConnection::start()+0x7) [0x2a84b47]
6. clickhouse-server(Poco::Net::TCPServerDispatcher::run()+0x107) [0x2a8f837]
7. clickhouse-server(Poco::PooledThread::run()+0x7f) [0x307860f]
8. clickhouse-server(Poco::ThreadImpl::runnableEntry(void*)+0x87) [0x3036087]
9. /lib/x86_64-linux-gnu/libpthread.so.0(+0x8182) [0x7fd479fdd182]
10. /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7fd4795f847d]

[alexey-milovidov]

TCP transport is more specific, we don't want to expose details.

Despite we have full compatibility of protocol of different versions of client and server, we want to keep the ability to "break" it for very old clients. And that protocol is not too clean to make a specification.

[plutov]

Thanks, I got it.