Reading from S3 has retries on almost any exception, except for
CANNOT_ALLOCATE_MEMORY, but the problem is that this exception may not
be even delivered to ReadBufferFromS3::processException(), due to
std::istream will hide it (see [1]).
[1]: 1834e42289/libcxx/include/istream (L1059)
So let's pass throught them to see at least some information instead of
just:
Message: Cannot read from istream at offset 0
And here as an example of exception:
<details>
(lldb) bt
* thread 244, name = 'MergeMutate', stop reason = breakpoint 6.1
* frame 0: 0x000000001aa9c791 clickhouse`::__cxa_throw(thrown_object=0x00007fc3b68fdb00, tinfo=0x000000000548af50, dest=(clickhouse`Poco::Net::NetException::~NetException() at NetException.cpp:26))(void *)) at cxa_exception.cpp:258:33
frame 1: 0x0000000017c55b2b clickhouse`Poco::Net::SocketImpl::error(code=-1232086272, arg=0x00007fc3be4f4d30) at SocketImpl.cpp:985:3
frame 2: 0x0000000017c1f7ff clickhouse`Poco::Net::SecureSocketImpl::handleError(int) [inlined] Poco::Net::SocketImpl::error(code=<unavailable>) at SocketImpl.cpp:923:2
frame 3: 0x0000000017c1f7e4 clickhouse`Poco::Net::SecureSocketImpl::handleError(this=0x00007fc35ae42b30, rc=-1) at SecureSocketImpl.cpp:531
frame 4: 0x0000000017c208f9 clickhouse`Poco::Net::SecureSocketImpl::receiveBytes(this=0x00007fc35ae42b30, buffer=0x00007fc346e402c4, length=131068, flags=<unavailable>) at SecureSocketImpl.cpp:353:10
frame 5: 0x0000000017c3b388 clickhouse`Poco::Net::HTTPSession::read(char*, long) [inlined] Poco::Net::StreamSocket::receiveBytes(buffer=<unavailable>, length=<unavailable>, flags=0) at StreamSocket.cpp:130:17
frame 6: 0x0000000017c3b379 clickhouse`Poco::Net::HTTPSession::read(char*, long) [inlined] Poco::Net::HTTPSession::receive(this=<unavailable>, buffer=<unavailable>, length=<unavailable>) at HTTPSession.cpp:166
frame 7: 0x0000000017c3b379 clickhouse`Poco::Net::HTTPSession::read(this=0x00007fc3973e9098, buffer=<unavailable>, length=<unavailable>) at HTTPSession.cpp:144
frame 8: 0x0000000017c0f706 clickhouse`Poco::Net::HTTPSClientSession::read(this=<unavailable>, buffer=<unavailable>, length=<unavailable>) at HTTPSClientSession.cpp:195:23
frame 9: 0x0000000017c32eb4 clickhouse`Poco::Net::HTTPFixedLengthStreamBuf::readFromDevice(this=0x00007fc361bd6708, buffer=<unavailable>, length=<unavailable>) at HTTPFixedLengthStream.cpp:53:16
frame 10: 0x0000000017c2a368 clickhouse`Poco::BasicBufferedStreamBuf<char, std::__1::char_traits<char>, Poco::Net::HTTPBufferAllocator>::underflow(this=0x00007fc361bd6708) at BufferedStreamBuf.h:97:17
frame 11: 0x0000000008b2abca clickhouse`std::__1::basic_streambuf<char, std::__1::char_traits<char> >::uflow(this=0x00007fc361bd6708) at streambuf:445:9
frame 12: 0x0000000008b2ab5a clickhouse`std::__1::basic_streambuf<char, std::__1::char_traits<char> >::xsgetn(this=0x00007fc361bd6708, __s="P, __n=1048576) at streambuf:422:25
frame 13: 0x0000000008b2ca0e clickhouse`std::__1::basic_istream<char, std::__1::char_traits<char> >::read(char*, long) [inlined] std::__1::basic_streambuf<char, std::__1::char_traits<char> >::sgetn[abi:v15000](this=<unavailable>, __s="!P, __n=1048576) at streambuf:204:14
frame 14: 0x0000000008b2ca02 clickhouse`std::__1::basic_istream<char, std::__1::char_traits<char> >::read(this=0x00007fc35ae42d40, __s="!P, __n=1048576) at istream:1052
frame 15: 0x0000000010de0b9f clickhouse`DB::ReadBufferFromIStream::nextImpl(this=0x00007fc3663d2380) at ReadBufferFromIStream.cpp:15:10
</details>
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
I've recently stumbled several times trying to figure out where to put the `SETTINGS` when inserting `VALUES` and `FROM INFILE`, so I'm clarifying it here in the docs.
