![• 2
• createOplog
• logOp
• db/oplog[h,cpp]
•](https://image.slidesharecdn.com/mongosourcecodereading-110628050713-phpapp01/85/MongoDB-6-320.jpg)
![CmdLine
•
• db/cmdline.[h, cpp]
• boost::program_options
• extern 2
• db/db.cpp //
• client/clientOnly.cpp //](https://image.slidesharecdn.com/mongosourcecodereading-110628050713-phpapp01/85/MongoDB-16-320.jpg)
![Client::Context
•
• NS
• Client
• db/client.[h,cpp]
• RAII
• DB](https://image.slidesharecdn.com/mongosourcecodereading-110628050713-phpapp01/85/MongoDB-17-320.jpg)
第一回MongoDBソースコードリーディング
- 2. • @nobu_k • Preferred Infrastructure (PFI) • Sedue • Sedue MongoDB(1.6) • CT○ • http://slidesha.re/hl8PyL • MongoDB as Search Engine Repository
- 3. • oplog •
- 4. • MongoDB • https://github.com/mongodb/mongo/ commits/master/ • 2011/6/26 •2 • pull
- 5. oplog •
- 6. • 2 • createOplog • logOp • db/oplog[h,cpp] •
- 8. createOplog void createOplog() { > use local dblock lk; // DB switched to db local > show collections // DB. me const char * ns = "local.oplog.$main"; oplog.$main pair.sync slaves sources system.indexes bool rs = !cmdLine._replSet.empty(); if( rs ) ns = rsoplog; // "local.oplog.rs"; // in db/repl/rs_optime.h NS
- 9. oplog Client::Context ctx(ns); // NS NamespaceDetails * nsd = nsdetails( ns ); if ( nsd ) { // oplog ... ... ... ... }
- 10. • oplog • ReplicaSet •
- 11. oplog • oplog • 1. oplog 2. BSON NS • BSON!! 3. oplog
- 12. • • Mac • oplog capped collection
- 13. createOplog • • db/repl.cpp • db/repl/rs_initialsync.cpp • db/repl/rs_initiate.cpp • ReplicaSet •
- 14. • • dblock • CmdLine • Context • DBDirectClient • NamespaceDetails, nsdetails •
- 15. dblock • DB • db/concurrency.h • Deprecated • writelock • dbMutex • scoped_lock • RAII
- 16. CmdLine • • db/cmdline.[h, cpp] • boost::program_options • extern 2 • db/db.cpp // • client/clientOnly.cpp //
- 17. Client::Context • • NS • Client • db/client.[h,cpp] • RAII • DB
- 18. currentClient • Client • Thread Local • boost::thread_specific_ptr<Client> • cc(), currenctClient, Context::getClient • DB
- 19. DBDirectClient • • DBClientInterface (client/dbclient.h) • DBConnector (client/dbclient.h) • DBClientWithCommands : public DBClientInterface • DBClientBase : public DBClientWithCommands, public DBConnector • DBDirectClient : public DBClientBase • findOne • c.findOne→DBClientInterface::findOne→DBClientInterface::findN→(virtual )DBDirectClient::query→DBClientBase::query • DBClientCursor •
- 20. NamespaceDetails • .ns (1 ) • • Database • MongoDataFile • Record •
- 21. nsdetails • Context NamespaceDetails • db/pdfile.h • cc().database()->namespaceIndex->details • NamespaceIndex • map<string, NamespaceDetails> •
- 22. logOp • •
- 23. oplog { ts: • oplog BSON op: ns: NS • o: BSON o2: } • o2
- 24. • i : insert • u : update • d : delete • c : db cmd? userCreateNS? • db : declares presence of a database • n : no op ( ) • • keep alive •
- 25. logOp _logOp void logOp(const char *opstr, const char *ns, const BSONObj& obj, BSONObj *patt, bool *b) { if ( replSettings.master ) { _logOp(opstr, ns, 0, obj, patt, b); } logOpForSharding( opstr , ns , obj , patt ); }
- 26. _logOp • • _logOpOld • _logOpRS • etc? •
- 27. _logOpOld • • Record theDataFileMgr • fast_oplog_insert!! • ( mmap )
- 28. append_O_Obj • partial ”o”+ • BSONBuilder • • repeatedly ed
- 29. _logOpRS •
- 32. We are hiring ! • • • • • • • • OSS • • (´ ω `)