YARN-7713. Add parallel copying of directories into FSDownload#2614

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Commits on Jan 12, 2021

YARN-7713. Add parallel copying of directories into FSDownload
TheSlashEffect
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Commits on Jan 18, 2021

YARN-7713. Replace Callable's logic with parallelStream
TheSlashEffect
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Commits on Feb 5, 2021

YARN-7713. Fix parallelism
TheSlashEffect
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