corwinjoy opened a new issue, #24: URL: https://github.com/apache/arrow-rs-object-store/issues/24
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** <!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] (This section helps Arrow developers understand the context and *why* for this feature, in addition to the *what*) --> We've encountered an issue when using `arrow-rs` via `DeltaLake`. Many times, delta files will hold dozens of parquet files in a log directory. To select recent files, the function `LocalFileSystem::list_with_offset` is called. This does not have an efficient implementation, instead, the entire directory is scanned in our example resulting in >100,000 statx system calls, several times for each file in the _delta_log subdirectory. This is terribly slow for our use case. **Describe the solution you'd like** <!-- A clear and concise description of what you want to happen. --> Upgrade `LocalFileSystem::list_with_offset` to filter the files and cut the number of statx calls. We have a simple PR (to follow) which does this. For our use case, it cuts the time to open the delta table from 35 seconds to 4 seconds. **Describe alternatives you've considered** <!-- A clear and concise description of any alternative solutions or features you've considered. --> There are likely fancier ways to filter these files and cut the number of statx calls, but a simple pre-filter like what we have done in the associated PR is quite effective. In general, it would be nice to have a more optimized LocalFileSystem implementation. **Additional context** <!-- Add any other context or screenshots about the feature request here. --> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
