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optimize file segment getCacheReadBuffer

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This commit is contained in:
xiedeyantu 2022-05-19 20:14:52 +08:00
parent dea1706d4e
commit 6338368a1c
1 changed files with 14 additions and 0 deletions
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14
src/Disks/IO/CachedReadBufferFromRemoteFS.cpp
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@ -282,6 +282,20 @@ SeekableReadBufferPtr CachedReadBufferFromRemoteFS::getReadBufferForFileSegment(
}
case FileSegment::State::PARTIALLY_DOWNLOADED:
{
if (file_segment->getDownloadOffset() > file_offset_of_buffer_end)
{
/// segment{k} state: PARTIALLY_DOWNLOADED
/// cache: [______|___________
/// ^
/// download_offset (in progress)
/// requested_range: [__________]
/// ^
/// file_offset_of_buffer_end
read_type = ReadType::CACHED;
return getCacheReadBuffer(range.left);
}
auto downloader_id = file_segment->getOrSetDownloader();
if (downloader_id == file_segment->getCallerId())
{