Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/2157#issuecomment-53534767
I don't think we need to change anything. `NumberFormat` is not thread-safe
mean we can not share the same `NumberFormat` instance among different threads
(coz they may call the `parse` or `format` methods). Obviously, it's not the
case here. And the `NumberFormat.getInstance()` itself should be thread-safe
if I understand correctly.
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