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Venkatesh Radhakrishnan authored
Summary: The immutable memtable iterators are allocated from an arena and there is no benefit from deleting these. Also the immutable memtables themselves will continue to be in memory until the version set containing it is alive. We will not remove immutable memtable iterators over the upper bound. We now add immutable iterators to the test. Test Plan: db_tailing_iter_test.TailingIteratorTrimSeekToNext Reviewers: tnovak, sdong Reviewed By: sdong Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D45597
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