Mingming Qiu 636964fcb5 Fix issue that tasks failed because of no sink for identifier (#6724)
* Fix issue that tasks failed because of no sink for identifier

* make find sinks to persist run in one callable together with the actual persist work

* Revert "make find sinks to persist run in one callable together with the actual persist work"

This reverts commit a24a2d80aeaf8f047d676e7260900fe916f36b78.
2019-01-04 17:09:11 -08:00
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