Details
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Bug
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Status: Closed
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Major - P3
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Resolution: Fixed
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3.2.0
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None
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Server Tools 10 (02/19/16)
Description
An empty collection will be dumped as a 0 byte .bson file. When running mongorestore normally, the empty collection will be correctly created. However, if --noIndexRestore is specified then the empty collection will not be created. If the server is running 3.2, then this prevents subsequent oplog replay from working (SERVER-17634), which impedes the workaround for TOOLS-176.
Reproducer:
> use test
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> db.dropDatabase()
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> db.createCollection("test")
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$ mongodump
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> db.dropDatabase()
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> show collections // returns nothing
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$ mongorestore
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> show collections // shows "test"
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> db.adminCommand({applyOps: [ { ts: Timestamp(1452934862,5), h: NumberLong("6736086318751491068"), v: 2, op: "i", ns: "test.test", o: { _id: 1 }, o2: {} } ] }) // succeeds
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{ "applied" : 1, "results" : [ true ], "ok" : 1 }
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> db.dropDatabase()
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$ mongorestore --noIndexRestore
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> show collections // returns nothing, but should show "test"
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> db.adminCommand({applyOps: [ { ts: Timestamp(1452934862,5), h: NumberLong("6736086318751491068"), v: 2, op: "i", ns: "test.test", o: { _id: 1 }, o2: {} } ] }) // fails with:
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{
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"applied" : 1,
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"code" : 26,
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"errmsg" : "Failed to apply insert due to missing collection: { ts: Timestamp 1452934862000|5, h: 6736086318751491068, v: 2.0, op: \"i\", ns: \"test.test\", o: { _id: 1.0 }, o2: {} }",
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"results" : [
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false
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],
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"ok" : 0
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}
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Workaround:
Instead of doing:
mongorestore --noIndexRestore --oplogReplay dump
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it is possible to do:
mongo --eval 'db.getSiblingDB("db").createCollection("collection")'
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# repeat for each empty collection, ie. each 0 byte .bson file under `dump`
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mongorestore --noIndexRestore --oplogReplay dump
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However, if --drop is used then the workaround is more complicated. Instead of doing:
mongorestore --drop --noIndexRestore --oplogReplay dump
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it should be possible to do:
mongorestore --drop --noIndexRestore dump
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mongo --eval 'db.getSiblingDB("db").createCollection("collection")'
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# repeat for each empty collection, ie. each 0 byte .bson file under `dump`
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mkdir justoplog ; mv data/oplog.bson justoplog
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mongorestore --oplogReplay --noIndexRestore justoplog
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Attachments
Issue Links
- related to
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- Closed
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TOOLS-852 mongorestore --noDataRestore
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- Accepted
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SERVER-17634 do not apply replicated insert operations on missing collections
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- Closed
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