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leveldb实现解析 淘宝-核心系统研发-存储 那岩 [email protected] 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

CISCO-IOS中文命令手册 第一章 路由器配置和文件管理 ................................................................................................................ 22 1.1. 通过TFTP 来配置路由器 .................................................................................................. 22 1.2. 保存路由器配置到服务器 ................................................................................................ 22 1.3. 使用远端配置文件启动路由器 ........................................................................................ 23 1.4. 保存大于NVRAM 大小的配置文件 .................................................................................. 24 1.5. 清除启动配置文件 ............................................................................................................ 24 1.6. 加载新的IOS 镜像 ............................................................................................................. 25 1.7. 以另一个IOS 镜像文件启动 ............................................................................................. 26 1.8. 通过网络启动 .................................................................................................................... 26 1.9. 拷贝IOS 镜像文件到服务器 ............................................................................................. 27 1.10. 通过控制台口拷贝IOS 镜像文件 ................................................................................... 28 1.11. 删除Flash 中的文件 ........................................................................................................ 29 1.12. 对Flash 进行分区 ............................................................................................................ 30 1.13. 配置路由器为TFTP 服务器 ............................................................................................ 30 1.14. 在路由器上使用FTP ....................................................................................................... 31 1.15. 批量产生路由器配置文件 .............................................................................................. 32 1.16. 同时改变多台路由器的配置 .......................................................................................... 32 1.17. 获的设备的硬件信息 ...................................................................................................... 32 1.18. 备份路由器的配置 .......................................................................................................... 32 1.19. 热重启 .............................................................................................................................. 32 Cisco IOS CookBook 中文精简版 Route To The Future