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### What changes were proposed in this pull request? Change `celeborn.<module>.io.mode` optional to explain default behavior in description. ### Why are the changes needed? The default value of `celeborn.<module>.io.mode` in document could be changed by whether epoll mode is available for different os. Therefore, `celeborn.<module>.io.mode` should be changed to optional and explained the default behavior in description of option. Follow up https://github.com/apache/celeborn/pull/3039#discussion_r1899340272. ### Does this PR introduce _any_ user-facing change? `celeborn.<module>.io.mode` is optional and explains default behavior in description. ### How was this patch tested? CI. Closes #3044 from SteNicholas/CELEBORN-1774. Authored-by: SteNicholas <programgeek@163.com> Signed-off-by: SteNicholas <programgeek@163.com> |
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