TypeError: Cannot read property 'length' of undefined

[benjaminbellamy]

I get a strange error after a few seconds.
Using Node v0.8.14, uptime v3 branch interval

Mongoose: pings.aggregate({ '$match': { timestamp: { '$lte': new Date("Fri, 16 Nov 2012 20:40:54 GMT"), '$gte': new Date("Thu, 15 Nov 2012 20:40:54 GMT") } } }) { '$project': { check: 1, responsive: { '$cond': [ { '$and': [ '$isResponsive' ] }, 1, '\u001b[33m0\u001b[39m' ] }, time: 1, tags: 1 } } { '$group': { _id: '$check', count: { '$sum': 1 }, responsiveness: { '$avg': '$responsive' }, responseTime: { '$avg': '$time' }, tags: { '$first': '$tags' }, start: { '$first': 1353012054480 }, end: { '$first': 1353098454480 } } }
Mongoose: pings.aggregate({ '$match': { timestamp: { '$lte': new Date("Fri, 16 Nov 2012 20:40:54 GMT"), '$gte': new Date("Thu, 15 Nov 2012 20:40:54 GMT") } } }) { '$project': { check: 1, responsive: { '$cond': [ { '$and': [ '$isResponsive' ] }, 1, '\u001b[33m0\u001b[39m' ] }, time: 1, tags: 1 } } { '$unwind': '$tags' } { '$group': { _id: '$tags', count: { '$sum': 1 }, responsiveness: { '$avg': '$responsive' }, responseTime: { '$avg': '$time' }, start: { '$first': 1353012054480 }, end: { '$first': 1353098454480 } } }
Mongoose: pings.aggregate({ '$match': { timestamp: { '$lte': new Date("Fri, 16 Nov 2012 20:59:59 GMT"), '$gte': new Date("Fri, 16 Nov 2012 20:00:00 GMT") } } }) { '$project': { check: 1, responsive: { '$cond': [ { '$and': [ '$isResponsive' ] }, 1, '\u001b[33m0\u001b[39m' ] }, time: 1, tags: 1 } } { '$group': { _id: '$check', count: { '$sum': 1 }, responsiveness: { '$avg': '$responsive' }, responseTime: { '$avg': '$time' }, tags: { '$first': '$tags' }, start: { '$first': 1353096000000 }, end: { '$first': 1353099599999 } } }
Mongoose: pings.aggregate({ '$match': { timestamp: { '$lte': new Date("Fri, 16 Nov 2012 20:59:59 GMT"), '$gte': new Date("Fri, 16 Nov 2012 20:00:00 GMT") } } }) { '$project': { check: 1, responsive: { '$cond': [ { '$and': [ '$isResponsive' ] }, 1, '\u001b[33m0\u001b[39m' ] }, time: 1, tags: 1 } } { '$unwind': '$tags' } { '$group': { _id: '$tags', count: { '$sum': 1 }, responsiveness: { '$avg': '$responsive' }, responseTime: { '$avg': '$time' }, start: { '$first': 1353096000000 }, end: { '$first': 1353099599999 } } }

/var/uptime/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:437
throw err;
^
TypeError: Cannot read property 'length' of undefined
at Object.async.forEach (/var/uptime/node_modules/async/lib/async.js:81:17)
at QosAggregator.updateHourlyCheckQos (/var/uptime/lib/qosAggregator.js:40:11)
at async.waterfall.wrapIterator (/var/uptime/node_modules/async/lib/async.js:428:21)
at Collection.aggregate (/var/uptime/node_modules/mongoose/node_modules/mongodb/lib/mongodb/collection.js:1568:7)
at Cursor.nextObject (/var/uptime/node_modules/mongoose/node_modules/mongodb/lib/mongodb/cursor.js:540:5)
at Cursor.nextObject.commandHandler (/var/uptime/node_modules/mongoose/node_modules/mongodb/lib/mongodb/cursor.js:522:14)
at g (events.js:192:14)
at EventEmitter.emit (events.js:126:20)
at Db._callHandler (/var/uptime/node_modules/mongoose/node_modules/mongodb/lib/mongodb/db.js:1473:25)
at Server.connect.connectionPool.on.server._serverState (/var/uptime/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:430:30)

[fzaninotto]

Weird. I can't reproduce the bug. Did you use a legacy Mongo database from Uptime V2, or did you start with a fresh database? How many checks do you have?

[benjaminbellamy]

I used a fresh db. (Actually I installed Mongo 5mn before Uptime v3 and never installed v2).
It crashed with only one check. Now I have 3 of them and it still crashes.

[fzaninotto]

I just pushed a bugfix (7ed11c4) that may be related to your problem. Could you retest?

[benjaminbellamy]

Pulled, testing…

[fzaninotto]

What's your MongoDB version? minimum should be 2.1.

[benjaminbellamy]

Bingo.

db.version()
1.8.2

[benjaminbellamy]

Mongo 2.2.1 installed: problem solved. Thanks.