westonpace commented on a change in pull request #10955:
URL: https://github.com/apache/arrow/pull/10955#discussion_r718114076
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File path: cpp/src/arrow/dataset/file_base.h
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@@ -364,6 +376,18 @@ struct ARROW_DS_EXPORT FileSystemDatasetWriteOptions {
/// {i} will be replaced by an auto incremented integer.
std::string basename_template;
+ /// If greater than 0 then this will limit the maximum number of files that
can be left
+ /// open. If an attempt is made to open too many files then the least
recently used file
+ /// will be closed. If this setting is set too low you may end up
fragmenting your data
+ /// into many small files.
+ uint32_t max_open_files = 1024;
+
+ /// If greater than 0 then this will limit how many rows are placed in any
single file.
Review comment:
I updated the comment to clarify what happens in that case. Yes, it
will create one file per directory.
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