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Type:
Task
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Resolution: Unresolved
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Priority:
Major - P3
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Affects Version/s: None
In MMAP items in a capped collection cannot grow - as per the documentation and an error is raised if they do.
> db.createCollection("cap",{capped:true,size:128000})
{ "ok" : 1 }
> db.cap.update({_id:1},{$set:{test:"hello",vals:["one"]}},true,true)
WriteResult({ "nMatched" : 0, "nUpserted" : 1, "nModified" : 0, "_id" : 1 })
> db.cap.update({_id:1},{$set:{test:"hello"},$push:{vals:"two"}},true,true)
WriteResult({
"nMatched" : 0,
"nUpserted" : 0,
"nModified" : 0,
"writeError" : {
"code" : 10003,
"errmsg" : "failing update: objects in a capped ns cannot grow"
}
})
In WiredTiger they are allowed to grow - is this deliberate?
> db.createCollection("cap",{capped:true,size:128000})
{ "ok" : 1 }
> db.cap.update({_id:1},{$set:{test:"hello",vals:["one"]}},true,true)
WriteResult({ "nMatched" : 0, "nUpserted" : 1, "nModified" : 0, "_id" : 1 })
> db.cap.findOne()
{ "_id" : 1, "test" : "hello", "vals" : [ "one" ] }
> db.cap.update({_id:1},{$set:{test:"hello"},$push:{vals:"two"}},true,true)
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.cap.findOne()
{ "_id" : 1, "test" : "hello", "vals" : [ "one", "two" ] }
- documents
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SERVER-20529 WiredTiger allows capped collection objects to grow
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- Closed
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- related to
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- Closed
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