One of such cases is 02479_race_condition_between_insert_and_droppin_mv
[1], yes it can be fixed (by using fixed number of iterations, or with
some bash trickery), but it is better to fix them completelly,
eventually such tests will be submitted and pass review anyway.
By allocating process group for each test we can kill all the processes
in this process group, and this what this patch does.
This will also fix some test hangs (like in [1]) as well as some
possible issues in stress tests.
[1]: https://s3.amazonaws.com/clickhouse-test-reports/0/e2c1230b00386c4d0096a245396ab3be7ce60950/stateless_tests__release__analyzer_/run.log
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
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>
