When running MongoDB aggregation on big collection, we have this error:
Exceeded memory limit for $group, but didn’t allow external sort
Solution:
Add option:
{ allowDiskUse: true }
db.getCollection('orders').aggregate( [ { $sort : { created : 1} } ], { allowDiskUse: true } )
MongoDB 4.4 error:
{
message: 'Path collision at activity',
stack: 'MongoError: Path collision at activity\n' +
' at Connection.<anonymous> (/project/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:443:61)\n' +
' at Connection.emit (events.js:315:20)\n' +
' at Connection.EventEmitter.emit (domain.js:483:12)\n' +
' at processMessage (/project/node_modules/mongoose/node_modules/mongodb-core/lib/connection/connection.js:364:10)\n' +
' at Socket.<anonymous> (/project/node_modules/mongoose/node_modules/mongodb-core/lib/connection/connection.js:533:15)\n' +
' at Socket.emit (events.js:315:20)\n' +
' at Socket.EventEmitter.emit (domain.js:483:12)\n' +
' at addChunk (_stream_readable.js:295:12)\n' +
' at readableAddChunk (_stream_readable.js:271:9)\n' +
' at Socket.Readable.push (_stream_readable.js:212:10)\n' +
' at TCP.onStreamRead (internal/stream_base_commons.js:186:23)',
operationTime: Timestamp { _bsontype: 'Timestamp', low_: 2, high_: 1600849377 },
ok: 0,
errmsg: 'Path collision at activity',
code: 31250,
codeName: 'Location31250',
'$clusterTime': {
clusterTime: Timestamp { _bsontype: 'Timestamp', low_: 2, high_: 1600849377 },
signature: {
hash: Binary {
_bsontype: 'Binary',
sub_type: 0,
position: 20,
buffer: <Buffer d2 34 b7 ac bc a7 3f ea 38 d1 5c e3 26 58 39 43 d8 11 6c 83>
},
keyId: Long { _bsontype: 'Long', low_: 4, high_: 1596659428 }
}
},
name: 'MongoError',
level: 'info',
timestamp: '2020-09-23 08:22:57',
[Symbol(mongoErrorContextSymbol)]: {}
}From version 4.4, MongoDB does not allow this projection of embedded document and a field of the same embedded document:
db.inventory.find( {}, { size: 1, “size.uom”: 1 } )
Solution:
Update the query to have either:
db.inventory.find( {}, { “size.uom”: 1 } )
or
db.inventory.find( {}, { size: 1,} )
When running cdk synth command, this error happens:
/usr/local/lib/node_modules/aws-cdk/lib/index.js:12322
return process.env.CDK_HOME ? path.resolve(process.env.CDK_HOME) : path.join((os.userInfo().homedir ?? os.homedir()).trim() \|\| "/", ".cdk");
SyntaxError: Unexpected token '?'
aws-cdk@2.28.0
Node version 12
Solution: Upgrade node to version 14+
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Error when adding AWS S3 event trigger:
An error occurred (InvalidArgument) when calling the PutBucketNotificationConfigura
Solutions:
To avoid an error, you must create resources in the following order:
1. Make sure SNS topic exists, because the S3 bucket references the SNS topic.
2. Make sure the S3 bucket exists, because the SNS topic policy references both the S3 bucket and the SNS topic.
Before subscribing an SNS topic to S3 event notifications, you must specify a topic policy (AWS::SNS::TopicPolicy) with the appropriate permissions. That topic policy must exist before you create the subscription.
{ “Sid”: “Statement-id”, “Effect”: “Allow”, “Principal”: { “AWS”: “*” }, “Action”: “sns:Publish”, “Resource”: { “Ref”: “SNSTopic” }, “Condition”: { “ArnLike”: { “aws:SourceArn”: { “Fn::Join”: [ “”, [ “arn:aws:s3:::”, { “Ref”: “S3Bucket” } ] ] } } } }
Finally check if the subscription to S3 event already exists.
