cyb70289 commented on code in PR #13662:
URL: https://github.com/apache/arrow/pull/13662#discussion_r938386723
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cpp/src/arrow/util/io_util.cc:
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@@ -1115,7 +1116,9 @@ Result<FileDescriptor> FileOpenWritable(const
PlatformFilename& file_name,
fd = FileDescriptor(ret);
#else
int oflag = O_CREAT;
-
+ if (sync) {
+ oflag |= O_SYNC;
Review Comment:
It's purely from coding perspective.
As `O_SYNC` is rarely used, avoiding the flag and adding `fdatasync`
explicitly before `fadvice` make the code easier to read IMHO.
An additional syscall is probably not a worry. I think the use case is
infrequent flushing of large data block.
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