[SERVER-12075] Index with specific name length will throw assertion on removal but not on creation Created: 12/Dec/13  Updated: 10/Dec/14  Resolved: 13/Dec/13

Status: Closed
Project: Core Server
Component/s: Internal Code
Affects Version/s: 2.4.0
Fix Version/s: None

Type: Bug Priority: Major - P3
Reporter: Shaun Verch Assignee: Unassigned
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Duplicate
duplicates SERVER-7793 Long index namespaces throw assertion... Closed
Operating System: ALL
Participants:

 Description   

The following code:

c = db.getSiblingDB("jstests_tool_dumprestore_24").getCollection("collection");
c.ensureIndex({ "a" : 1, "b" : 1, "c" : 1, "indexpropertycounter0" : 1, "indexpropertycounter1" : 1, "indexpropertycounter2" : 1});
c.drop();

Will produce this stack trace from mongod:

 0   mongod                              0x0000000100d5ed85 mongo::printStackTrace(std::ostream&) + 37
 1   mongod                              0x0000000100cbc094 mongo::logContext(char const*) + 228
 2   mongod                              0x0000000100c97656 mongo::msgasserted(int, char const*) + 390
 3   mongod                              0x0000000100c978aa mongo::ExceptionInfo::append(mongo::BSONObjBuilder&, char const*, char const*) const + 0
 4   mongod                              0x00000001002436f5 mongo::Namespace::extraName(int) const + 369
 5   mongod                              0x0000000100242553 mongo::NamespaceIndex::kill_ns(mongo::StringData const&) + 149
 6   mongod                              0x0000000100375f77 mongo::Database::_dropNS(mongo::StringData const&) + 1205
 7   mongod                              0x000000010022e259 mongo::IndexCatalog::_dropIndex(int) + 641
 8   mongod                              0x000000010022f584 mongo::IndexCatalog::dropIndex(int) + 316
 9   mongod                              0x000000010022fa3f mongo::IndexCatalog::dropAllIndexes(bool) + 805
 10  mongod                              0x000000010037a351 mongo::Database::dropCollection(mongo::StringData const&) + 1205
 11  mongod                              0x0000000100392b33 mongo::CmdDrop::run(std::string const&, mongo::BSONObj&, int, std::string&, mongo::BSONObjBuilder&, bool) + 1267
 12  mongod                              0x0000000100389f46 mongo::_execCommand(mongo::Command*, std::string const&, mongo::BSONObj&, int, std::string&, mongo::BSONObjBuilder&, bool) + 118
 13  mongod                              0x000000010038c681 mongo::Command::execCommand(mongo::Command*, mongo::Client&, int, char const*, mongo::BSONObj&, mongo::BSONObjBuilder&, bool) + 7059
 14  mongod                              0x000000010038da2f mongo::_runCommands(char const*, mongo::BSONObj&, mongo::_BufBuilder<mongo::TrivialAllocator>&, mongo::BSONObjBuilder&, bool, int) + 2303
 15  mongod                              0x00000001007fbb15 mongo::runCommands(char const*, mongo::BSONObj&, mongo::CurOp&, mongo::_BufBuilder<mongo::TrivialAllocator>&, mongo::BSONObjBuilder&, bool, int) + 117
 16  mongod                              0x00000001007fce1a mongo::newRunQuery(mongo::Message&, mongo::QueryMessage&, mongo::CurOp&, mongo::Message&) + 1674
 17  mongod                              0x00000001005a85fb mongo::receivedQuery(mongo::Client&, mongo::DbResponse&, mongo::Message&) + 859
 18  mongod                              0x00000001005ac6c9 mongo::assembleResponse(mongo::Message&, mongo::DbResponse&, mongo::HostAndPort const&) + 1225
 19  mongod                              0x000000010000c689 mongo::MyMessageHandler::process(mongo::Message&, mongo::AbstractMessagingPort*, mongo::LastError*) + 335

It comes from the fact that we are checking for "<indexname>" + "$extra" rather than just the index in the "Namespace::extraName" function on deletion, but not during creation. I suspect we aren't actually creating the "extraName" index, but I don't know what the purpose of this extra index actually is.


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