lingbin opened a new pull request #2884: Add `sync_dir` interface to Env URL: https://github.com/apache/incubator-doris/pull/2884 when we need to ensure that **a newly-created file** is fully synchronized back to disk, we should call `fsync()` on the parent directory—that is, the directory containing the newly-created file. That is to say, In this situation, we should call `fsync()` on both the newly-created file and its parent directory. Unfortunately, currently in Doris, in any scenario, directories are not fsynced. This patch adds `sync_dir()` interface first, laying the goundwork for future fixes. This patch also remove unneeded private method `dir_exists()`.
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