[RocksDB][Performance Branch]Iterator Cleanup method only tries to find...
[RocksDB][Performance Branch]Iterator Cleanup method only tries to find obsolete files if it has the last reference to a version Summary: When deconstructing an iterator, no need to check obsolete file if it doesn't hold last reference of any version. Test Plan: make all check Reviewers: haobo, igor, dhruba, kailiu Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D14595
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