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详细说明: leveldb实现解析 淘宝-核心系统研发-存储 那岩 neveray@gmail.com 2011-12-13 目录 一、 代码目录结构 ....................................................................... 1 1. doc/ ............................................................................ 1 2. include/leveldb/ ................................................................. 1 3. db/ ............................................................................. 1 4. table/........................................................................... 1 5. port/ ............. .............................................................. 1 6. util/ ........................................................................... 1 7. helper/memenv/ ................................................................... 1 二、 基本概念 .......................................................................... 1 1. Slice (include/leveldb/slice.h) .................................................. 1 2. Option (include/leveldb/option.h) .............................................. 2 3. Env (include/leveldb/env.h util/env_posix.h) .................................... 3 4. varint (util/coding.h) ........................................................... 3 5. ValueType (db/dbformat.h) ...................................................... 3 6. SequnceNnumber (db/dbformat.h) ................................................. 4 7. user key......................................................................... 4 8. ParsedInternalKey (db/dbformat.h) .............................................. 4 9. InternalKey (db/dbformat.h) ...................................................... 4 10. LookupKey (db/dbformat.h) ........................................................ 4 11. Comparator (include/leveldb/comparator.h util/comparator.cc) .................... 4 12. InternalKeyComparator (db/dbformat.h) ............................................ 5 13. WriteBatch (db/write_batch.cc) ................................................. 5 14. Memtable (db/memtable.cc db/skiplist.h) .......................................... 5 15. Sstable (table/table.cc) ......................................................... 5 16. FileMetaData (db/version_edit.h) ............................................... 5 17. block (table/block.cc) ........................................................... 6 18. BlockHandle(table/format.h) ...................................................... 6 19. FileNumber(db/dbformat.h) ...................................................... 6 20. filename (db/filename.cc) ........................................................ 6 21. level-n (db/version_set.h) ....................................................... 7 22. Compact (db/db_impl.cc db/version_set.cc) ........................................ 7 23. Compaction(db/version_set.cc) .................................................... 7 24. Version (db/version_set.cc) ...................................................... 8 25. VersionSet (db/version_set.cc) ................................................. 9 26. VersionEdit(db/version_edit.cc) ................................................. 10 27. VersionSet::Builder (db/version_set.cc) ......................................... 11 28. Manifest(descriptor)(db/version_set.cc)...................................... 12 29. TableBuilder/BlockBuilder(table/table_builder.cc table/block_builder.cc) ......... 12 30. Iterator (include/leveldb/iterator.h) ........................................... 12 三、 存储结构的格式定义与操作 .......................................................... 12 1. memtable (db/skiplist.h db/memtable) ............................................ 12 2. block of sstable (table/block_builder.cc table/block.cc) ......................... 14 3. sstable (table/table_bulder.cc/table.cc) ........................................ 16 4. block of log (db/log_format.h db/log_writer.cc db/log_reader.cc) .............. 18 5. log (db/log_format.h db/log_writer.cc db/log_reader.cc) ........................ 18 6. cache(util/cache.cc) .......................................................... 19 7. Snapshot (include/leveldb/snapshot.h) ......................................... 19 8. Iterator (include/leveldb/iterator.h) ........................................... 19 四、 主要流程 ......................................................................... 24 1. open ........................................................................... 24 2. put ............................................................................ 25 3. get ............................................................................ 25 4. delete.......................................................................... 26 5. snapshot........................................................................ 26 6. NewIterator ..................................................................... 26 7. compact......................................................................... 26 五、 总结 ............................................................................. 30 1. 设计/实现中的优化 ............................................................... 30 2. 可以做的优化 .................................................................... 31 ...展开收缩
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