sdong 4e0dcd36df db_stress sometimes generates keys close to SST file boundaries (#6037)
Summary:
Recently, a bug was found related to a seek key that is close to SST file boundary. However, it only occurs in a very small chance in db_stress, because the chance that a random key hits SST file boundaries is small. To boost the chance, with 1/16 chance, we pick keys that are close to SST file boundaries.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6037

Test Plan: Did some manual printing out, and hack to cover the key generation logic to be correct.

Differential Revision: D18598476

fbshipit-source-id: 13b76687d106c5be4e3e02a0c77fa5578105a071
2019-11-19 13:17:03 -08:00
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