mirror of
https://github.com/ClickHouse/ClickHouse.git
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311 lines
9.1 KiB
C++
311 lines
9.1 KiB
C++
#if defined(__linux__) || defined(__FreeBSD__)
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#include <IO/ReadBufferAIO.h>
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#include <IO/AIOContextPool.h>
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#include <Common/ProfileEvents.h>
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#include <Common/Stopwatch.h>
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#include <Core/Defines.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <optional>
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namespace ProfileEvents
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{
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extern const Event FileOpen;
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extern const Event ReadBufferAIORead;
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extern const Event ReadBufferAIOReadBytes;
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}
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namespace CurrentMetrics
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{
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extern const Metric Read;
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}
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int FILE_DOESNT_EXIST;
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extern const int CANNOT_OPEN_FILE;
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extern const int LOGICAL_ERROR;
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extern const int ARGUMENT_OUT_OF_BOUND;
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extern const int AIO_READ_ERROR;
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}
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/// Note: an additional page is allocated that will contain the data that
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/// does not fit into the main buffer.
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ReadBufferAIO::ReadBufferAIO(const std::string & filename_, size_t buffer_size_, int flags_, char * existing_memory_)
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: ReadBufferFromFileBase(buffer_size_ + DEFAULT_AIO_FILE_BLOCK_SIZE, existing_memory_, DEFAULT_AIO_FILE_BLOCK_SIZE),
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fill_buffer(BufferWithOwnMemory<ReadBuffer>(internalBuffer().size(), nullptr, DEFAULT_AIO_FILE_BLOCK_SIZE)),
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filename(filename_)
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{
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ProfileEvents::increment(ProfileEvents::FileOpen);
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int open_flags = (flags_ == -1) ? O_RDONLY : flags_;
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open_flags |= O_DIRECT;
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fd = ::open(filename.c_str(), open_flags);
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if (fd == -1)
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{
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auto error_code = (errno == ENOENT) ? ErrorCodes::FILE_DOESNT_EXIST : ErrorCodes::CANNOT_OPEN_FILE;
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throwFromErrnoWithPath("Cannot open file " + filename, filename, error_code);
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}
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}
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ReadBufferAIO::~ReadBufferAIO()
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{
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if (!aio_failed)
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{
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try
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{
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(void) waitForAIOCompletion();
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}
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catch (...)
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{
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tryLogCurrentException(__PRETTY_FUNCTION__);
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}
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}
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if (fd != -1)
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::close(fd);
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}
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void ReadBufferAIO::setMaxBytes(size_t max_bytes_read_)
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{
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if (is_started)
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throw Exception("Illegal attempt to set the maximum number of bytes to read from file " + filename, ErrorCodes::LOGICAL_ERROR);
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max_bytes_read = max_bytes_read_;
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}
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bool ReadBufferAIO::nextImpl()
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{
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/// If the end of the file has already been reached by calling this function,
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/// then the current call is wrong.
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if (is_eof)
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return false;
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std::optional<Stopwatch> watch;
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if (profile_callback)
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watch.emplace(clock_type);
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if (!is_aio)
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{
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synchronousRead();
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is_aio = true;
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}
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else
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receive();
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if (profile_callback)
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{
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ProfileInfo info;
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info.bytes_requested = requested_byte_count;
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info.bytes_read = bytes_read;
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info.nanoseconds = watch->elapsed();
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profile_callback(info);
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}
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is_started = true;
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/// If the end of the file is just reached, do nothing else.
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if (is_eof)
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return bytes_read != 0;
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/// Create an asynchronous request.
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prepare();
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#if defined(__FreeBSD__)
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request.aio.aio_lio_opcode = LIO_READ;
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request.aio.aio_fildes = fd;
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request.aio.aio_buf = reinterpret_cast<volatile void *>(buffer_begin);
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request.aio.aio_nbytes = region_aligned_size;
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request.aio.aio_offset = region_aligned_begin;
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#else
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request.aio_lio_opcode = IOCB_CMD_PREAD;
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request.aio_fildes = fd;
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request.aio_buf = reinterpret_cast<UInt64>(buffer_begin);
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request.aio_nbytes = region_aligned_size;
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request.aio_offset = region_aligned_begin;
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#endif
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/// Send the request.
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try
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{
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future_bytes_read = AIOContextPool::instance().post(request);
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}
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catch (...)
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{
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aio_failed = true;
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throw;
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}
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is_pending_read = true;
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return true;
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}
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off_t ReadBufferAIO::seek(off_t off, int whence)
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{
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off_t new_pos_in_file;
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if (whence == SEEK_SET)
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{
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if (off < 0)
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throw Exception("SEEK_SET underflow", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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new_pos_in_file = off;
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}
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else if (whence == SEEK_CUR)
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{
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if (off >= 0)
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{
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if (off > (std::numeric_limits<off_t>::max() - getPositionInFile()))
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throw Exception("SEEK_CUR overflow", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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}
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else if (off < -getPositionInFile())
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throw Exception("SEEK_CUR underflow", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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new_pos_in_file = getPositionInFile() + off;
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}
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else
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throw Exception("ReadBufferAIO::seek expects SEEK_SET or SEEK_CUR as whence", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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if (new_pos_in_file != getPositionInFile())
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{
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off_t first_read_pos_in_file = first_unread_pos_in_file - static_cast<off_t>(working_buffer.size());
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if (hasPendingData() && (new_pos_in_file >= first_read_pos_in_file) && (new_pos_in_file <= first_unread_pos_in_file))
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{
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/// Moved, but remained within the buffer.
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pos = working_buffer.begin() + (new_pos_in_file - first_read_pos_in_file);
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}
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else
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{
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/// Moved past the buffer.
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pos = working_buffer.end();
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first_unread_pos_in_file = new_pos_in_file;
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/// If we go back, than it's not eof
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is_eof = false;
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/// We can not use the result of the current asynchronous request.
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skip();
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}
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}
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return new_pos_in_file;
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}
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void ReadBufferAIO::synchronousRead()
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{
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CurrentMetrics::Increment metric_increment_read{CurrentMetrics::Read};
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prepare();
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bytes_read = ::pread(fd, buffer_begin, region_aligned_size, region_aligned_begin);
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ProfileEvents::increment(ProfileEvents::ReadBufferAIORead);
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ProfileEvents::increment(ProfileEvents::ReadBufferAIOReadBytes, bytes_read);
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finalize();
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}
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void ReadBufferAIO::receive()
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{
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if (!waitForAIOCompletion())
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return;
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finalize();
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}
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void ReadBufferAIO::skip()
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{
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if (!waitForAIOCompletion())
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return;
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is_aio = false;
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/// @todo I presume this assignment is redundant since waitForAIOCompletion() performs a similar one
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// bytes_read = future_bytes_read.get();
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if ((bytes_read < 0) || (static_cast<size_t>(bytes_read) < region_left_padding))
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throw Exception("Asynchronous read error on file " + filename, ErrorCodes::AIO_READ_ERROR);
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}
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bool ReadBufferAIO::waitForAIOCompletion()
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{
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if (is_eof || !is_pending_read)
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return false;
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CurrentMetrics::Increment metric_increment_read{CurrentMetrics::Read};
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bytes_read = future_bytes_read.get();
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is_pending_read = false;
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ProfileEvents::increment(ProfileEvents::ReadBufferAIORead);
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ProfileEvents::increment(ProfileEvents::ReadBufferAIOReadBytes, bytes_read);
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return true;
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}
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void ReadBufferAIO::prepare()
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{
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requested_byte_count = std::min(fill_buffer.internalBuffer().size() - DEFAULT_AIO_FILE_BLOCK_SIZE, max_bytes_read);
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/// Region of the disk from which we want to read data.
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const off_t region_begin = first_unread_pos_in_file;
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if ((requested_byte_count > static_cast<size_t>(std::numeric_limits<off_t>::max())) ||
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(first_unread_pos_in_file > (std::numeric_limits<off_t>::max() - static_cast<off_t>(requested_byte_count))))
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throw Exception("An overflow occurred during file operation", ErrorCodes::LOGICAL_ERROR);
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const off_t region_end = first_unread_pos_in_file + requested_byte_count;
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/// The aligned region of the disk from which we will read the data.
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region_left_padding = region_begin % DEFAULT_AIO_FILE_BLOCK_SIZE;
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const size_t region_right_padding = (DEFAULT_AIO_FILE_BLOCK_SIZE - (region_end % DEFAULT_AIO_FILE_BLOCK_SIZE)) % DEFAULT_AIO_FILE_BLOCK_SIZE;
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region_aligned_begin = region_begin - region_left_padding;
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if (region_end > (std::numeric_limits<off_t>::max() - static_cast<off_t>(region_right_padding)))
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throw Exception("An overflow occurred during file operation", ErrorCodes::LOGICAL_ERROR);
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const off_t region_aligned_end = region_end + region_right_padding;
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region_aligned_size = region_aligned_end - region_aligned_begin;
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buffer_begin = fill_buffer.internalBuffer().begin();
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}
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void ReadBufferAIO::finalize()
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{
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if ((bytes_read < 0) || (static_cast<size_t>(bytes_read) < region_left_padding))
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throw Exception("Asynchronous read error on file " + filename, ErrorCodes::AIO_READ_ERROR);
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/// Ignore redundant bytes on the left.
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bytes_read -= region_left_padding;
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/// Ignore redundant bytes on the right.
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bytes_read = std::min(static_cast<off_t>(bytes_read), static_cast<off_t>(requested_byte_count));
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if (bytes_read > 0)
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fill_buffer.buffer().resize(region_left_padding + bytes_read);
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if (static_cast<size_t>(bytes_read) < requested_byte_count)
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is_eof = true;
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if (first_unread_pos_in_file > (std::numeric_limits<off_t>::max() - bytes_read))
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throw Exception("An overflow occurred during file operation", ErrorCodes::LOGICAL_ERROR);
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first_unread_pos_in_file += bytes_read;
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total_bytes_read += bytes_read;
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working_buffer_offset = region_left_padding;
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if (total_bytes_read == max_bytes_read)
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is_eof = true;
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/// Swap the main and duplicate buffers.
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swap(fill_buffer);
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}
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}
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#endif
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