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Type:
Bug
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Resolution: Works as Designed
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Priority:
Major - P3
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None
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Affects Version/s: 3.4.10
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Component/s: None
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Labels:None
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ALL
I've moved some data manually, using moveChunk, and a document is missing. I can find it manually, by querying a shard which has it, but when i make the same query from the sharded shell it's not there. The balancer is now disabled.
mongos> db.smtp_in_auth.find({"_id": ObjectId('5a590cf4016548d302f5eae0')})
mongos> db.smtp_in_auth.find({"_id": ObjectId('5a590cf4016548d302f5eae0')}).explain()
{
"queryPlanner" : {
"mongosPlannerVersion" : 1,
"winningPlan" : {
"stage" : "SINGLE_SHARD",
"shards" : [
{
"shardName" : "rs4",
"connectionString" : "rs4/XXX:10104,XXY:10104",
"serverInfo" : {
"host" : "XYZ",
"port" : 10104,
"version" : "3.4.10",
"gitVersion" : "078f28920cb24de0dd479b5ea6c66c644f6326e9"
},
"plannerVersion" : 1,
"namespace" : "db.col",
"indexFilterSet" : false,
"parsedQuery" : {
"_id" : {
"$eq" : ObjectId("5a590cf4016548d302f5eae0")
}
},
"winningPlan" : {
"stage" : "SHARDING_FILTER",
"inputStage" : {
"stage" : "IDHACK"
}
},
"rejectedPlans" : [ ]
}
]
}
},
"ok" : 1
}
mongos>
rs4:PRIMARY> use db
switched to db db
rs4:PRIMARY> db.col.findOne({"_id": ObjectId('5a590cf4016548d302f5eae0')})
null
rs1:PRIMARY> use db
switched to db db
rs1:PRIMARY> db.col.findOne({"_id": ObjectId('5a590cf4016548d302f5eae0')})
{ "_id" : ObjectId("5a590cf4016548d302f5eae0") }
So the cluster thinks that that _id is located on rs4, when it actually resides on rs1. I know from experience that restarting everything a couple of times fix this issue, but i'd rather not do that.