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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: Storage
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Labels:
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Environment:Redhat 5.2 64bit, mongoDB 2.4.6, ruby 1.9.3
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Linux
avgObjSize keep enlarging when setup usePowerOf2Sizes again
I am trying to use "usePowerOf2Sizes" on my collection for reusing space since i need to drop the whole collection later. But i find out when i setup "usePowerOf2Sizes" after my insert operation, the avgObjSize is being larger and larger. The avgObjSize should only change once then return
{ok:1} right? example as below
===================================================
> db.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf.stats();
{
"ns" : "test007.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf",
"count" : 19999,
"size" : 5119760,
"avgObjSize" : 256.000800040002,
"storageSize" : 5586944,
"numExtents" : 5,
"nindexes" : 1,
"lastExtentSize" : 4194304,
"paddingFactor" : 1,
"systemFlags" : 1,
"userFlags" : 1,
"totalIndexSize" : 654080,
"indexSizes" : {
"_id_" : 654080
},
"ok" : 1
}
> db.runCommand({collMod:"gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf","usePowerOf2Sizes":true})
{ "usePowerOf2Sizes_old" : false, "usePowerOf2Sizes_new" : true, "ok" : 1 }
> insert
> db.runCommand({collMod:"gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf","usePowerOf2Sizes":true})
{ "ok" : 1 }
> db.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf.stats();
{
"ns" : "test007.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf",
"count" : 20000,
"size" : 5120256,
"avgObjSize" : 256.0128,
"storageSize" : 5586944,
"numExtents" : 5,
"nindexes" : 1,
"lastExtentSize" : 4194304,
"paddingFactor" : 1,
"systemFlags" : 1,
"userFlags" : 1,
"totalIndexSize" : 654080,
"indexSizes" : {
"_id_" : 654080
},
"ok" : 1
}
> insert
>db.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf.stats();
{
"ns" : "test007.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf",
"count" : 20001,
"size" : 5120752,
"avgObjSize" : 256.02479876006197,
"storageSize" : 5586944,
"numExtents" : 5,
"nindexes" : 1,
"lastExtentSize" : 4194304,
"paddingFactor" : 1,
"systemFlags" : 1,
"userFlags" : 1,
"totalIndexSize" : 654080,
"indexSizes" : {
"_id_" : 654080
},
"ok" : 1
}
===================================================
Is it a bug? finally my avgObjSize got double( 500B ) after around 20k insert operation,