ecdec1913f
The old behavior was to open and scan the entire archive file for every single video download. This resulted in horrible performance for archives of any remotely large size, especially since all new video IDs are appended to the end of the archive. For anyone who uses the archive feature to maintain archives of entire video playlists or channels, this meant that all such lists with newer downloads would have to scan close to the end of the archive file before the potential download was rejected. For archives with tens of thousands of lines, this easily resulted in millions of line reads and checks over the course of scanning a single channel or playlist that had been seen previously. The new behavior in this commit is to preload the archive file into a binary search tree and scan the tree instead of constantly scanning the file on disk for every file. When a new download is appended to the archive file, it is also added to this tree. The performance is massively better using this strategy over the more "naive" line-by-line archive file parsing strategy. The only negative consequence of this change is that the archive in memory will not be synchronized with the archive file on disk. Running multiple instances of the program at the same time that all use the same archive file may result in duplicate archive entries or duplicated downloads. This is unlikely to be a serious issue for the vast majority of users. If the instances are not likely to try to download identical video IDs then this should not be a problem anyway; for example, having two instances pull two completely different YouTube channels at once should be fine. Signed-off-by: Jody Bruchon <jody@jodybruchon.com> |
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| .. | ||
| downloader | ||
| extractor | ||
| postprocessor | ||
| __init__.py | ||
| __main__.py | ||
| aes.py | ||
| cache.py | ||
| compat.py | ||
| jsinterp.py | ||
| options.py | ||
| socks.py | ||
| swfinterp.py | ||
| update.py | ||
| utils.py | ||
| version.py | ||
| YoutubeDL.py | ||