We have been having some problems where our mongo connection fails to allow us to get the database names from the DB.

We call the method:

com.mongodb.Mongo.getDatabaseNames()
And 1 out of 100 times, it throws the following exception:

Caused by: com.mongodb.CommandFailureException:

{ "serverUsed" : "localhost:27017" , "errmsg" : "exception: can't open database in a read lock. if db was just closed, consider retrying the query. might otherwise indicate an internal error" , "code" : 15927 , "ok" : 0.0}

at com.mongodb.CommandResult.getException(CommandResult.java:76)
at com.mongodb.CommandResult.throwOnError(CommandResult.java:131)
at com.mongodb.Mongo.getDatabaseNames(Mongo.java:397)
Looking at the mongo code, the database is the internal admin database

public List<String> getDatabaseNames(){

BasicDBObject cmd = new BasicDBObject();
cmd.put("listDatabases", 1);

>>CommandResult res = getDB(ADMIN_DATABASE_NAME).command(cmd, getOptions());
res.throwOnError();
This database is not being deleted, but there are several other databases that could be deleted around this time.

Has anyone else had this problem?

reposted from StackOverflow:
http://stackoverflow.com/questions/25988180/mongo-getdatabasenames-occasionally-throws-commandfailureexception?noredirect=1#comment40757879_25988180