akankshamahajan ceeca7542d Create a thread in DeleteScheduler only when rate limit enabled (#6564)
Summary:
Create a thread in DeleteScheduler only when delete rate limit is set
	 because when there is no rate limit on deletion, a thread per DeleteScheduler
	 consumes unnecessary resources.

Test Plan: make -j64 check

Reviewed By: riversand963

Differential Revision: D20538138

Pulled By: akankshamahajan15

fbshipit-source-id: 137499e810e817156345c30d627f8678b9adadf7
2020-03-24 11:29:51 -07:00
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