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Create a background indexing job, drop the index before the secondary finishes building it and it won't be deleted from the secondary. The secondary does receive the drop command:
m31000| 2013-12-09T23:15:13.719+0000 [conn1] build index on: fgIndexSec.jstests_feh properties: { v: 1, key: { i: 1.0 }, name: "i_1", ns: "fgIndexSec.jstests_feh", background: true }
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m31000| 2013-12-09T23:15:14.057+0000 [conn1] build index done. scanned 100000 total records. 0.338 secs
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m31000| 2013-12-09T23:15:14.057+0000 [conn1] command fgIndexSec.$cmd command: { insert: "system.indexes", documents: [ { _id: ObjectId('52a64f010da7f86215d22152'), ns: "fgIndexSec.jstests_feh", key: { i: 1.0 }, name: "i_1", background: true } ], ordered: true } keyUpdates:0 reslen:40 338ms
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Secondary starts index build:
m31001| 2013-12-09T23:15:14.058+0000 [repl index builder 0] build index on: fgIndexSec.jstests_feh properties: { v: 1, key: { i: 1.0 }, name: "i_1", ns: "fgIndexSec.jstests_feh", background: true }
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system.indexes.find().forEach(printjson) on primary and secondary:
{
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"v" : 1,
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"key" : {
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"_id" : 1
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},
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"name" : "_id_",
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"ns" : "fgIndexSec.jstests_feh"
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}
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{
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"v" : 1,
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"key" : {
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"i" : 1
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},
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"name" : "i_1",
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"ns" : "fgIndexSec.jstests_feh",
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"background" : true
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}
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{
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"v" : 1,
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"key" : {
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"_id" : 1
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},
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"name" : "_id_",
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"ns" : "fgIndexSec.jstests_feh"
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}
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{
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"v" : 1,
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"key" : {
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"i" : 1
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},
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"name" : "i_1",
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"ns" : "fgIndexSec.jstests_feh",
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"background" : true
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}
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At this point (from currentOp) the index build progress on the secondary is:
"bg index build Background Index Build Progress: 1367/100000 1%"
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drop the index
m31000| 2013-12-09T23:15:14.062+0000 [conn1] CMD: dropIndexes fgIndexSec.jstests_feh
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Secondary gets dropIndexes:
m31001| 2013-12-09T23:15:14.065+0000 [repl writer worker 1] CMD: dropIndexes fgIndexSec.jstests_feh
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But after index build completes, doesn't drop:
Primary:
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{
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"v" : 1,
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"key" : {
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"_id" : 1
|
},
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"name" : "_id_",
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"ns" : "fgIndexSec.jstests_feh"
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}
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Secondary:
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{
|
"v" : 1,
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"key" : {
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"_id" : 1
|
},
|
"name" : "_id_",
|
"ns" : "fgIndexSec.jstests_feh"
|
}
|
{
|
"v" : 1,
|
"key" : {
|
"i" : 1
|
},
|
"name" : "i_1",
|
"ns" : "fgIndexSec.jstests_feh",
|
"background" : true
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}
|
|