Details
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Bug
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Resolution: Done
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Major - P3
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None
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None
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Redhat 5.2 64bit, mongoDB 2.4.6, ruby 1.9.3
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Linux
Description
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
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> db.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf.stats();
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{
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"ns" : "test007.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf",
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"count" : 19999,
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"size" : 5119760,
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"avgObjSize" : 256.000800040002,
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"storageSize" : 5586944,
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"numExtents" : 5,
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"nindexes" : 1,
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"lastExtentSize" : 4194304,
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"paddingFactor" : 1,
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"systemFlags" : 1,
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"userFlags" : 1,
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"totalIndexSize" : 654080,
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"indexSizes" : {
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"_id_" : 654080
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},
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"ok" : 1
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}
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> db.runCommand({collMod:"gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf","usePowerOf2Sizes":true})
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{ "usePowerOf2Sizes_old" : false, "usePowerOf2Sizes_new" : true, "ok" : 1 }
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> insert
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> db.runCommand({collMod:"gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf","usePowerOf2Sizes":true})
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{ "ok" : 1 }
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> db.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf.stats();
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{
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"ns" : "test007.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf",
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"count" : 20000,
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"size" : 5120256,
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"avgObjSize" : 256.0128,
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"storageSize" : 5586944,
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"numExtents" : 5,
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"nindexes" : 1,
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"lastExtentSize" : 4194304,
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"paddingFactor" : 1,
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"systemFlags" : 1,
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"userFlags" : 1,
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"totalIndexSize" : 654080,
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"indexSizes" : {
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"_id_" : 654080
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},
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"ok" : 1
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}
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> insert
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>db.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf.stats();
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{
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"ns" : "test007.gs_e89dfd94_7be7_44aa_b55b_6297cdfd9cbf",
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"count" : 20001,
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"size" : 5120752,
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"avgObjSize" : 256.02479876006197,
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"storageSize" : 5586944,
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"numExtents" : 5,
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"nindexes" : 1,
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"lastExtentSize" : 4194304,
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"paddingFactor" : 1,
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"systemFlags" : 1,
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"userFlags" : 1,
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"totalIndexSize" : 654080,
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"indexSizes" : {
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"_id_" : 654080
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},
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"ok" : 1
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}
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===================================================
Is it a bug? finally my avgObjSize got double( 500B ) after around 20k insert operation,