mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-18 04:12:19 +00:00
98e3a99a88
Since this hides real problems, since destructor does final flush and if
it fails, then data will be lost.
One of such examples if MEMORY_LIMIT_EXCEEDED exception, so lock
exceptions from destructors, by using
MemoryTracker::LockExceptionInThread to block these exception, and allow
others (so std::terminate will be called, since this is c++11 with
noexcept for destructors by default).
Here is an example, that leads to empty block in the distributed batch:
2021.01.21 12:43:18.619739 [ 46468 ] {7bd60d75-ebcb-45d2-874d-260df9a4ddac} <Error> virtual DB::CompressedWriteBuffer::~CompressedWriteBuffer(): Code: 241, e.displayText() = DB::Exception: Memory limit (for user) exceeded: would use 332.07 GiB (attempt to allocate chunk of 4355342 bytes), maximum: 256.00 GiB, Stack trace (when copying this message, always include the lines below):
0. DB::Exception::Exception<>() @ 0x86f7b88 in /usr/bin/clickhouse
...
4. void DB::PODArrayBase<>::resize<>(unsigned long) @ 0xe9e878d in /usr/bin/clickhouse
5. DB::CompressedWriteBuffer::nextImpl() @ 0xe9f0296 in /usr/bin/clickhouse
6. DB::CompressedWriteBuffer::~CompressedWriteBuffer() @ 0xe9f0415 in /usr/bin/clickhouse
7. DB::DistributedBlockOutputStream::writeToShard() @ 0xf6bed4a in /usr/bin/clickhouse
146 lines
3.7 KiB
C++
146 lines
3.7 KiB
C++
#include <unistd.h>
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#include <errno.h>
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#include <cassert>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <Common/Exception.h>
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#include <Common/ProfileEvents.h>
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#include <Common/CurrentMetrics.h>
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#include <Common/Stopwatch.h>
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#include <Common/MemoryTracker.h>
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#include <IO/WriteBufferFromFileDescriptor.h>
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#include <IO/WriteHelpers.h>
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namespace ProfileEvents
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{
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extern const Event WriteBufferFromFileDescriptorWrite;
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extern const Event WriteBufferFromFileDescriptorWriteFailed;
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extern const Event WriteBufferFromFileDescriptorWriteBytes;
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extern const Event DiskWriteElapsedMicroseconds;
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}
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namespace CurrentMetrics
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{
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extern const Metric Write;
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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 CANNOT_WRITE_TO_FILE_DESCRIPTOR;
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extern const int CANNOT_FSYNC;
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extern const int CANNOT_SEEK_THROUGH_FILE;
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extern const int CANNOT_TRUNCATE_FILE;
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extern const int CANNOT_FSTAT;
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}
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void WriteBufferFromFileDescriptor::nextImpl()
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{
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if (!offset())
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return;
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Stopwatch watch;
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size_t bytes_written = 0;
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while (bytes_written != offset())
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{
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ProfileEvents::increment(ProfileEvents::WriteBufferFromFileDescriptorWrite);
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ssize_t res = 0;
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{
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CurrentMetrics::Increment metric_increment{CurrentMetrics::Write};
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res = ::write(fd, working_buffer.begin() + bytes_written, offset() - bytes_written);
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}
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if ((-1 == res || 0 == res) && errno != EINTR)
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{
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ProfileEvents::increment(ProfileEvents::WriteBufferFromFileDescriptorWriteFailed);
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throwFromErrnoWithPath("Cannot write to file " + getFileName(), getFileName(),
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ErrorCodes::CANNOT_WRITE_TO_FILE_DESCRIPTOR);
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}
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if (res > 0)
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bytes_written += res;
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}
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ProfileEvents::increment(ProfileEvents::DiskWriteElapsedMicroseconds, watch.elapsedMicroseconds());
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ProfileEvents::increment(ProfileEvents::WriteBufferFromFileDescriptorWriteBytes, bytes_written);
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}
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/// Name or some description of file.
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std::string WriteBufferFromFileDescriptor::getFileName() const
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{
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return "(fd = " + toString(fd) + ")";
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}
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WriteBufferFromFileDescriptor::WriteBufferFromFileDescriptor(
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int fd_,
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size_t buf_size,
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char * existing_memory,
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size_t alignment)
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: WriteBufferFromFileBase(buf_size, existing_memory, alignment), fd(fd_) {}
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WriteBufferFromFileDescriptor::~WriteBufferFromFileDescriptor()
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{
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if (fd < 0)
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{
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assert(!offset() && "attempt to write after close");
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return;
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}
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/// FIXME move final flush into the caller
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MemoryTracker::LockExceptionInThread lock;
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next();
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}
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void WriteBufferFromFileDescriptor::sync()
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{
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/// If buffer has pending data - write it.
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next();
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/// Request OS to sync data with storage medium.
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int res = fsync(fd);
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if (-1 == res)
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throwFromErrnoWithPath("Cannot fsync " + getFileName(), getFileName(), ErrorCodes::CANNOT_FSYNC);
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}
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off_t WriteBufferFromFileDescriptor::seek(off_t offset, int whence)
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{
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off_t res = lseek(fd, offset, whence);
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if (-1 == res)
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throwFromErrnoWithPath("Cannot seek through file " + getFileName(), getFileName(),
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ErrorCodes::CANNOT_SEEK_THROUGH_FILE);
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return res;
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}
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void WriteBufferFromFileDescriptor::truncate(off_t length)
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{
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int res = ftruncate(fd, length);
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if (-1 == res)
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throwFromErrnoWithPath("Cannot truncate file " + getFileName(), getFileName(), ErrorCodes::CANNOT_TRUNCATE_FILE);
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}
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off_t WriteBufferFromFileDescriptor::size()
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{
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struct stat buf;
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int res = fstat(fd, &buf);
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if (-1 == res)
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throwFromErrnoWithPath("Cannot execute fstat " + getFileName(), getFileName(), ErrorCodes::CANNOT_FSTAT);
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return buf.st_size;
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}
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}
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