anand76 4ee991b1e6 Cleanup multiple DBs after running db_bench in multi-DB mode (#7891)
Summary:
Currently, db_bench cleanup only deletes the main DB, if there's one.
Multiple DBs that are opened when --num_multi_db is specified are not
deleted, which can lead to crashes due to running compaction threads on
process exit.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7891

Test Plan: Run regression test

Reviewed By: jay-zhuang

Differential Revision: D26049914

Pulled By: anand1976

fbshipit-source-id: acef2821001ca5e208a96a6a273c724e56353316
2021-01-26 11:12:22 -08:00
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