There is incomplete fix in bug https://jira.mongodb.org/browse/TOOLS-638. Currently i get following error when dumping my MongoDB instance: Failed: error running `listIndexes`. Collection: `xxx` Err: read tcp 127.0.0.1:27017: i/o timeout

I think there is missing fix (session.SetSocketTimeout(0)) in metadata_dump.go before calling GetIndexes function:

// Second, we read the collection's index information by either calling
// listIndexes (pre-2.7 systems) or querying system.indexes.
// We keep a running list of all the indexes
// for the current collection as we iterate over the cursor, and include
// that list as the "indexes" field of the metadata document.
log.Logf(log.DebugHigh, "\treading indexes for `%v`", nsID)

session, err := dump.sessionProvider.GetSession()
if err != nil

{ return err }
defer session.Close()
+ session.SetSocketTimeout(0)

// get the indexes
indexesIter, err := db.GetIndexes(session.DB(intent.DB).C(intent.C))
if err != nil { return err }