anand76 ebaa3c8a59 Fix a race condition in DumpStats() during iteration of the ColumnFamilySet (#8714)
Summary:
DumpStats() iterates through the ColumnFamilySet. There is a potential
race condition because it does Ref the cfd, and the cfd could get
destroyed during the iteration.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8714

Test Plan: make check

Reviewed By: ltamasi

Differential Revision: D30580199

Pulled By: anand1976

fbshipit-source-id: 60a3443ad0d4f7ac6a977dec780e6d2c1b70b850
2021-08-26 15:40:26 -07:00
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