sdong a150604e10 db_stress to cover total order seek (#6039)
Summary:
Right now, in db_stress, as long as prefix extractor is defined, TestIterator always uses. There is value of cover total_order_seek = true when prefix extractor is define. Add a small chance that this flag is turned on.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6039

Test Plan: Run the test for a while.

Differential Revision: D18539689

fbshipit-source-id: 568790dd7789c9986b83764b870df0423a122d99
2019-11-18 15:01:38 -08:00
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