81c9cc9b3b
Summary: This diff implements a special type of iterator that doesn't create a snapshot (can be used to read newly inserted data) and is optimized for doing sequential reads. TailingIterator uses current superversion number to determine whether to invalidate its internal iterators. If the version hasn't changed, it can often avoid doing expensive seeks over immutable structures (sst files and immutable memtables). Test Plan: * new unit tests * running LD with this patch Reviewers: igor, dhruba, haobo, sdong, kailiu Reviewed By: sdong CC: leveldb, lovro, march Differential Revision: https://reviews.facebook.net/D15285 |
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| rocksdb | ||
| utilities | ||