mongodb - Mongo 2.6.12 secondaries not using index -

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we upgraded our mongo replica set 2.4 2.6.12 , having strange behavior primary uses indexes , secondaries not.

for instance query:

query fitly_metrics_production.rank_ledger_entries query: { $query: {  user_id: objectid('56dd084df093a136580be18a'), category: "chest" },  $orderby: { _id: -1 } } plansummary: ixscan { _id: 1 } ntoskip:0  nscanned:1645536 nscannedobjects:1645536 keyupdates:0 numyields:12866  locks(micros) r:138352610 nreturned:1 reslen:316 481856ms

when run explain() on on same box see

{ "cursor" : "btreecursor user_id_1_category_1", "ismultikey" : false, "n" : 9, "nscannedobjects" : 9, "nscanned" : 9, "nscannedobjectsallplans" : 30, "nscannedallplans" : 30, "scanandorder" : true, "indexonly" : false, "nyields" : 0, "nchunkskips" : 0, "millis" : 0, "indexbounds" : {     "user_id" : [         [             objectid("56dd084df093a136580be18a"),             objectid("56dd084df093a136580be18a")         ]     ],     "category" : [         [             "chest",             "chest"         ]     ] }, "server" : "ip-10-7-2-11:27017", "filterset" : false }

and when run on primary hit index properly, have 2 secondaries , occurring on both secondaries.

any idea of going on? thanks.


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