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  1. Core Server
  2. SERVER-20972

indexStats should not assert if db or collection don't exist

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      MongoDB shell version: 3.0.7
connecting to: metis.local:50330/test
Server has startup warnings:
2015-10-16T11:00:33.815-0400 I CONTROL  [initandlisten]
2015-10-16T11:00:33.815-0400 I CONTROL  [initandlisten] ** NOTE: This is a development version (3.1.9) of MongoDB.
2015-10-16T11:00:33.815-0400 I CONTROL  [initandlisten] **       Not recommended for production.
2015-10-16T11:00:33.815-0400 I CONTROL  [initandlisten]
2015-10-16T11:00:33.815-0400 I CONTROL  [initandlisten]
2015-10-16T11:00:33.816-0400 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
> db.dropDatabase()
{ "dropped" : "test", "ok" : 1 }
> db.foo.aggregate( { $indexStats:{} })
assert: command failed: {
        "ok" : 0,
        "errmsg" : "Database not found on index stats retrieval: test",
        "code" : 28804
} : aggregate failed
Error: command failed: {
        "ok" : 0,
        "errmsg" : "Database not found on index stats retrieval: test",
        "code" : 28804
} : aggregate failed
    at Error (<anonymous>)
    at doassert (src/mongo/shell/assert.js:11:14)
    at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5)
    at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12)
    at (shell):1:8
2015-10-16T11:01:53.663-0400 E QUERY    Error: command failed: {
        "ok" : 0,
        "errmsg" : "Database not found on index stats retrieval: test",
        "code" : 28804
} : aggregate failed
    at Error (<anonymous>)
    at doassert (src/mongo/shell/assert.js:11:14)
    at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5)
    at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12)
    at (shell):1:8 at src/mongo/shell/assert.js:13
> db.createCollection("foo")
{ "ok" : 1 }
> db.foo.aggregate( { $indexStats:{} })
{ "name" : "_id_", "host" : "metis.local:50330", "accesses" : { "ops" : NumberLong(0), "since" : ISODate("2015-10-16T15:02:27.991Z") } }
> db.foo.drop()
true
> db.foo.aggregate( { $indexStats:{} })
assert: command failed: {
        "ok" : 0,
        "errmsg" : "Collection not found on index stats retrieval: test.foo",
        "code" : 28795
} : aggregate failed
Error: command failed: {
        "ok" : 0,
        "errmsg" : "Collection not found on index stats retrieval: test.foo",
        "code" : 28795
} : aggregate failed
    at Error (<anonymous>)
    at doassert (src/mongo/shell/assert.js:11:14)
    at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5)
    at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12)
    at (shell):1:8
2015-10-16T11:02:41.830-0400 E QUERY    Error: command failed: {
        "ok" : 0,
        "errmsg" : "Collection not found on index stats retrieval: test.foo",
        "code" : 28795
} : aggregate failed
    at Error (<anonymous>)
    at doassert (src/mongo/shell/assert.js:11:14)
    at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5)
    at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12)
    at (shell):1:8 at src/mongo/shell/assert.js:13
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      MongoDB shell version: 3.0.7 connecting to: metis.local:50330/test Server has startup warnings: 2015-10-16T11:00:33.815-0400 I CONTROL [initandlisten] 2015-10-16T11:00:33.815-0400 I CONTROL [initandlisten] ** NOTE: This is a development version (3.1.9) of MongoDB. 2015-10-16T11:00:33.815-0400 I CONTROL [initandlisten] ** Not recommended for production. 2015-10-16T11:00:33.815-0400 I CONTROL [initandlisten] 2015-10-16T11:00:33.815-0400 I CONTROL [initandlisten] 2015-10-16T11:00:33.816-0400 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000 > db.dropDatabase() { "dropped" : "test", "ok" : 1 } > db.foo.aggregate( { $indexStats:{} }) assert: command failed: { "ok" : 0, "errmsg" : "Database not found on index stats retrieval: test", "code" : 28804 } : aggregate failed Error: command failed: { "ok" : 0, "errmsg" : "Database not found on index stats retrieval: test", "code" : 28804 } : aggregate failed at Error (<anonymous>) at doassert (src/mongo/shell/assert.js:11:14) at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5) at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12) at (shell):1:8 2015-10-16T11:01:53.663-0400 E QUERY Error: command failed: { "ok" : 0, "errmsg" : "Database not found on index stats retrieval: test", "code" : 28804 } : aggregate failed at Error (<anonymous>) at doassert (src/mongo/shell/assert.js:11:14) at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5) at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12) at (shell):1:8 at src/mongo/shell/assert.js:13 > db.createCollection("foo") { "ok" : 1 } > db.foo.aggregate( { $indexStats:{} }) { "name" : "_id_", "host" : "metis.local:50330", "accesses" : { "ops" : NumberLong(0), "since" : ISODate("2015-10-16T15:02:27.991Z") } } > db.foo.drop() true > db.foo.aggregate( { $indexStats:{} }) assert: command failed: { "ok" : 0, "errmsg" : "Collection not found on index stats retrieval: test.foo", "code" : 28795 } : aggregate failed Error: command failed: { "ok" : 0, "errmsg" : "Collection not found on index stats retrieval: test.foo", "code" : 28795 } : aggregate failed at Error (<anonymous>) at doassert (src/mongo/shell/assert.js:11:14) at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5) at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12) at (shell):1:8 2015-10-16T11:02:41.830-0400 E QUERY Error: command failed: { "ok" : 0, "errmsg" : "Collection not found on index stats retrieval: test.foo", "code" : 28795 } : aggregate failed at Error (<anonymous>) at doassert (src/mongo/shell/assert.js:11:14) at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5) at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12) at (shell):1:8 at src/mongo/shell/assert.js:13
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      Currently, indexStats asserts if the db or collection don't exist. While this may be unlikely in practice, I can see two much more user friendly responses:

      • return an empty result (i.e. 0 documents from the pipeline)
      • create the collection on the fly and return the new id index

            Assignee:
            james.wahlin@mongodb.com James Wahlin
            Reporter:
            david.golden@mongodb.com David Golden
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