powerOf2Sizes still default when mongod started with --setParameter newCollectionsUsePowerOf2Sizes=false

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    • Type: Bug
    • Resolution: Done
    • Priority: Major - P3
    • 2.6.0-rc2
    • Affects Version/s: 2.6.0-rc0
    • Component/s: None
    • None
    • ALL
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      Started mongod with

      numactl --interleave=all bin/mongod --config bin/mongodb.config --setParameter newCollectionsUsePowerOf2Sizes=false

      Confirm command line option was used:

      > db.adminCommand({"getParameter":1, "newCollectionsUsePowerOf2Sizes":1})
{ "newCollectionsUsePowerOf2Sizes" : false, "ok" : 1 }

      Look at collection created after mongod was started and it uses powerOf2Sizes because userFlags:1

      

      

      > db.sbtest2.stats()
      
{
      
        "ns" : "sbtest.sbtest2",
      
        "count" : 1964000,
      
        "size" : 471360000,
      
        "avgObjSize" : 240,
      
        "storageSize" : 629637120,
      
        "numExtents" : 16,
      
        "nindexes" : 2,
      
        "lastExtentSize" : 168742912,
      
        "paddingFactor" : 1,
      
        "systemFlags" : 1,
      
        "userFlags" : 1,
      
        "totalIndexSize" : 124046272,
      
        "indexSizes" : 
      
{
                "_id_" : 54820080,
                "k_1" : 69226192
        }

      ,
      
        "ok" : 1
      
}
      
{noformat]
      
                
      
            
      
            
      
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                                             Started mongod with 
  
 numactl --interleave=all bin/mongod --config bin/mongodb.config --setParameter newCollectionsUsePowerOf2Sizes=false
 
  

 Confirm command line option was used: 
  
 > db.adminCommand({"getParameter":1, "newCollectionsUsePowerOf2Sizes":1})
{ "newCollectionsUsePowerOf2Sizes" : false, "ok" : 1 }
 
  

 Look at collection created after mongod was started and it uses powerOf2Sizes because userFlags:1 

  
  
  
 > db.sbtest2.stats() 
{ 
        "ns" : "sbtest.sbtest2", 
        "count" : 1964000, 
        "size" : 471360000, 
        "avgObjSize" : 240, 
        "storageSize" : 629637120, 
        "numExtents" : 16, 
        "nindexes" : 2, 
        "lastExtentSize" : 168742912, 
        "paddingFactor" : 1, 
        "systemFlags" : 1, 
        "userFlags" : 1, 
        "totalIndexSize" : 124046272, 
        "indexSizes" :  
{
                "_id_" : 54820080,
                "k_1" : 69226192
        }
 , 
        "ok" : 1 
} 
{noformat] 
                                    
      
            
      
        
      
      
                            
      
        
      
    
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      I started mongod with --setParameter newCollectionsUsePowerOf2Sizes=false, then created a new collection and db.$collection.stats() has userFlags:1 which means that powerOf2Sizes is enabled for that collection.
      


      Given the work described here, shouldn't this not have used powerOf2Sizes?
      
            
      

      

          


          

            








            
                        

            Assignee:
            

            
    

            
            



    
            Daniel Pasette (Inactive)
            
        
    
    
                                            

            Reporter:
            

            
    

            
            



    
            Mark Callaghan
            
        
    

                                                            
            
        
    
            
    
            
        
                                

                    
    
            
                                            
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            Created:
    
              

              
    
                                                                                                 

              
            
              
            Updated:
    
              

              
    
                                                                                                 

              
            
              
            Resolved: