MongoDB Unrecoverable Failure My machine (OSX) had a power failure and when restarted, I have one db in MongoDB that is completely unrecoverable. I am using the db per directory with dbpath and logpath specified options and was able to recover all except one of the dbs. This is the log from the unrecoverable one. Any ideas would be helpful - I have run --repair and removed the lock file with zero results.

The Error Log message in terminal:

2015-10-07T11:28:22.102+0530 W STORAGE  [initandlisten] database/Users/JineshJohn/TECSOL/zatsa2/data/db local could not be opened due to DBException 0: assertion src/mongo/db/storage/mmap_v1/extent.h:77 
2015-10-07T11:28:22.108+0530 I STORAGE  [initandlisten] exception in initAndListen: 0 assertion src/mongo/db/storage/mmap_v1/extent.h:77, terminating
2015-10-07T11:28:22.108+0530 I CONTROL  [initandlisten] now exiting
2015-10-07T11:28:22.108+0530 I NETWORK  [initandlisten] shutdown: going to close listening sockets...
2015-10-07T11:28:22.108+0530 I NETWORK  [initandlisten] removing socket file: /tmp/mongodb-27017.sock
2015-10-07T11:28:22.108+0530 I NETWORK  [initandlisten] shutdown: going to flush diaglog...
2015-10-07T11:28:22.108+0530 I NETWORK  [initandlisten] shutdown: going to close sockets...
2015-10-07T11:28:22.108+0530 I STORAGE  [initandlisten] shutdown: waiting for fs preallocator...
2015-10-07T11:28:22.108+0530 I STORAGE  [initandlisten] shutdown: final commit...
2015-10-07T11:28:22.108+0530 I JOURNAL  [initandlisten] journalCleanup...
2015-10-07T11:28:22.108+0530 I JOURNAL  [initandlisten] removeJournalFiles
2015-10-07T11:28:22.108+0530 I JOURNAL  [initandlisten] Terminating durability thread ...
2015-10-07T11:28:22.213+0530 I JOURNAL  [journal writer] Journal writer thread stopped
2015-10-07T11:28:22.213+0530 I JOURNAL  [durability] Durability thread stopped
2015-10-07T11:28:22.213+0530 I STORAGE  [initandlisten] shutdown: closing all files...
2015-10-07T11:28:22.214+0530 I STORAGE  [initandlisten] closeAllFiles() finished
2015-10-07T11:28:22.214+0530 I STORAGE  [initandlisten] shutdown: removing fs lock...
2015-10-07T11:28:22.214+0530 I CONTROL  [initandlisten] dbexit:  rc: 100
Try to use mongodump and mongorestore. mongodump works more forcefully then repair. Hope it will work and keep updated.