### What changes were proposed in this pull request? `SimpleDateFormat` is not thread-safe, replace it with a thread-safe `FastDateFormat` ### Why are the changes needed? `FastDateFormat` is a fast and thread-safe version of `java.text.SimpleDateFormat`. ### Does this PR introduce _any_ user-facing change? Yes, it's a bug fix. ### How was this patch tested? Manually review. Closes #1545 from pan3793/CELEBORN-636. Authored-by: Cheng Pan <chengpan@apache.org> Signed-off-by: Ethan Feng <ethanfeng@apache.org> |
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