Performs a large sort operation (Aggregation) in a collection, and hits the following error message :
MongoDB Console
> db.bigdata.aggregate(
{$group : {_id : "$range", total : { $sum : 1 }}},
{$sort : {total : -1}}
);
#...
aggregate failed
at Error (<anonymous>)
at doassert (src/mongo/shell/assert.js:11:14)
#...
Error: command failed: {
"errmsg" : "exception: Sort exceeded memory limit of 104857600 bytes,
but did not opt in to external sorting. Aborting operation. Pass allowDiskUse:true to opt in.",
"code" : 16819,
"ok" : 0
}
P.S Tested with MongoDB 3.0.6
Solution
Changed in version 2.6 – Read this Memory Restrictions
In MongoDB, the in-memory sorting have a limit of 100M, to perform a large sort, you need enable
In MongoDB, the in-memory sorting have a limit of 100M, to perform a large sort, you need enable
allowDiskUse option to write data to a temporary files for sorting.
To fix it, enable the allowDiskUse option in your query :
db.bigdata.aggregate(
[
{$group : {_id : "$range", total : { $sum : 1 }}},
{$sort : {total : -1}}
],
{allowDiskUse: true}
);
Hi mkyong,
I got thi error :
“allowDiskUse” : true}; nested exception is com.mongodb.CommandFailureException: { “serverUsed” : “xxxxx” , “errmsg” : “exception: aggregation result exceeds maximum document size (16MB)” , “code” : 16389 , “ok” : 0.0}
I use mongodb 3
please help..
Just add output type as Cursor.