Minor - P4 This was tested on MongoDB 3.0.2 with the MMAPv1 storage engine.
It appears that it is possible to specify negative numbers for the maxFilesPerDB configuration option.
For example:
storage:
mmapv1:
quota:
maxFilesPerDB: -1
The mongod server appears to successfully parse and accept this value:
2015-05-01T14:20:22.422+1000 I CONTROL [initandlisten] allocator: system
2015-05-01T14:20:22.422+1000 I CONTROL [initandlisten] options: { config: "mongod.conf", net: { port: 27017 }, processManagement: { fork: true }, storage: { dbPath: "/private/tmp/delete_me/data/db", mmapv1: { quota: { maxFilesPerDB: -1 } } }, systemLog: { destination: "file", logAppend: true, path: "/private/tmp/delete_me/data/mongod.log" } }
2015-05-01T14:20:22.423+1000 I INDEX [initandlisten] allocating new ns file /private/tmp/delete_me/data/db/local.ns, filling with zeroes...
2015-05-01T14:20:22.470+1000 I STORAGE [FileAllocator] allocating new datafile /private/tmp/delete_me/data/db/local.0, filling with zeroes...
Furthermore, we are still able to allocate files:
2015-05-01T14:20:43.847+1000 I INDEX [conn3] allocating new ns file /private/tmp/delete_me/data/db/cats.ns, filling with zeroes... 2015-05-01T14:20:43.893+1000 I STORAGE [FileAllocator] allocating new datafile /private/tmp/delete_me/data/db/cats.0, filling with zeroes... 2015-05-01T14:20:44.046+1000 I STORAGE [FileAllocator] done allocating datafile /private/tmp/delete_me/data/db/cats.0, size: 64MB, took 0.152 secs 2015-05-01T14:20:44.098+1000 I WRITE [conn3] insert cats.mycats query: { _id: ObjectId('5542ff1bfd2f77fdc55eed2b'), name: "ernie" } ninserted:1 keyUpdates:0 writeConflicts:0 numYields:0 locks:{ Global: { acquireCount: { w: 2 } }, MMAPV1Journal: { acquireCount: { w: 8 }, acquireWaitCount: { w: 1 }, timeAcquiringMicros: { w: 64 } }, Database: { acquireCount: { w: 1, W: 1 } }, Collection: { acquireCount: { W: 1 } }, Metadata: { acquireCount: { W: 4 } } } 250ms 2015-05-01T14:20:44.098+1000 I COMMAND [conn3] command cats.$cmd command: insert { insert: "mycats", documents: [ { _id: ObjectId('5542ff1bfd2f77fdc55eed2b'), name: "ernie" } ], ordered: true } keyUpdates:0 writeConflicts:0 numYields:0 reslen:40 locks:{ Global: { acquireCount: { w: 2 } }, MMAPV1Journal: { acquireCount: { w: 8 }, acquireWaitCount: { w: 1 }, timeAcquiringMicros: { w: 64 } }, Database: { acquireCount: { w: 1, W: 1 } }, Collection: { acquireCount: { W: 1 } }, Metadata: { acquireCount: { W: 4 } } } 253ms
However, after the first file, it appears we hit the quota. On the shell where we are trying to insert documents, we see:
WriteResult({
"nInserted" : 0,
"writeError" : {
"code" : 12501,
"errmsg" : "quota exceeded"
}
})
However, the mongod.log logfile itself does not appear to log anything about this (Default logLevel: 0):
2015-05-01T14:20:44.098+1000 I WRITE [conn3] insert cats.mycats query: { _id: ObjectId('5542ff1bfd2f77fdc55eed2b'), name: "ernie" } ninserted:1 keyUpdates:0 writeConflicts:0 numYields:0 locks:{ Global: { acquireCount: { w: 2 } }, MMAPV1Journal: { acquireCount: { w: 8 }, acquireWaitCount: { w: 1 }, timeAcquiringMicros: { w: 64 } }, Database: { acquireCount: { w: 1, W: 1 } }, Collection: { acquireCount: { W: 1 } }, Metadata: { acquireCount: { W: 4 } } } 250ms
2015-05-01T14:20:44.098+1000 I COMMAND [conn3] command cats.$cmd command: insert { insert: "mycats", documents: [ { _id: ObjectId('5542ff1bfd2f77fdc55eed2b'), name: "ernie" } ], ordered: true } keyUpdates:0 writeConflicts:0 numYields:0 reslen:40 locks:{ Global: { acquireCount: { w: 2 } }, MMAPV1Journal: { acquireCount: { w: 8 }, acquireWaitCount: { w: 1 }, timeAcquiringMicros: { w: 64 } }, Database: { acquireCount: { w: 1, W: 1 } }, Collection: { acquireCount: { W: 1 } }, Metadata: { acquireCount: { W: 4 } } } 253ms
2015-05-01T14:49:21.599+1000 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51853 #4 (2 connections now open)
2015-05-01T14:49:21.601+1000 I NETWORK [conn4] end connection 127.0.0.1:51853 (1 connection now open)
2015-05-01T14:49:21.608+1000 I NETWORK [conn3] end connection 127.0.0.1:51360 (0 connections now open)
2015-05-01T14:49:23.337+1000 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51854 #5 (1 connection now open)
2015-05-01T14:52:51.797+1000 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51944 #6 (2 connections now open)
2015-05-01T14:54:42.248+1000 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51975 #7 (3 connections now open)
2015-05-01T14:54:51.165+1000 I NETWORK [conn7] end connection 127.0.0.1:51975 (2 connections now open)
2015-05-01T14:54:53.186+1000 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51981 #8 (3 connections now open)
2015-05-01T14:55:07.577+1000 I NETWORK [conn8] end connection 127.0.0.1:51981 (2 connections now open)
2015-05-01T14:55:10.555+1000 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51987 #9 (3 connections now open)
2015-05-01T14:55:10.556+1000 I NETWORK [conn9] end connection 127.0.0.1:51987 (2 connections now open)
2015-05-01T14:55:10.563+1000 I NETWORK [conn5] end connection 127.0.0.1:51854 (1 connection now open)
2015-05-01T14:55:13.345+1000 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51989 #10 (2 connections now open)