mongodb三節點同時建立副本集出現的bug

節點一：10.4.4.4:27017

節點二：10.4.4.5:27017

節點三：10.4.4.6:27017

建立三個節點組成的副本集，竟然産生以下結果：

./mongo 10.4.4.4:27017

檢視rs

rs.status()

{

"set" : "mongodb_set",

"date" : ISODate("2014-04-04T06:44:10Z"),

"myState" : 1,

"members" : [

{

"_id" : 0,

"name" : "10.4.4.4:27017",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 903,

"optime" : Timestamp(1396592962, 1),

"optimeDate" : ISODate("2014-04-04T06:29:22Z"),

"self" : true

{

"_id" : 1,

"name" : "10.4.4.5:27017",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 883,

"optime" : Timestamp(1396593341, 1416),

"optimeDate" : ISODate("2014-04-04T06:35:41Z"),

"lastHeartbeat" : ISODate("2014-04-04T06:44:09Z"),

"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),

"pingMs" : 0

}

"ok" : 1

}

這個狀态之一存在，直到關閉目前連接配接。

./mongo 10.4.4.5:27017

檢視rs

rs.status()

{

"set" : "mongodb_set",

"date" : ISODate("2014-04-04T06:43:45Z"),

"myState" : 1,

"members" : [

{

"_id" : 0,

"name" : "10.4.4.5:27017",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 878,

"optime" : Timestamp(1396593341, 1416),

"optimeDate" : ISODate("2014-04-04T06:35:41Z"),

"self" : true

{

"_id" : 1,

"name" : "10.4.4.6:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 858,

"optime" : Timestamp(1396593341, 1416),

"optimeDate" : ISODate("2014-04-04T06:35:41Z"),

"lastHeartbeat" : ISODate("2014-04-04T06:43:45Z"),

"lastHeartbeatRecv" : ISODate("2014-04-04T06:43:45Z"),

"pingMs" : 0,

"syncingTo" : "10.4.4.5:27017"

}

"ok" : 1

}

以上現象非常奇怪，副本集id都是一緻的，結果産生了兩個副本集，都是獨立的，而且更奇怪的是，其中有個一副本集具有兩個primary。

測試以下兩個副本集是否相通：

在第二個副本集上執行資料插入

for(i=1;i<10000;++i){

db.person.insert({

id: i,

name: "mongodb"+i

} )

}

在第二個副本集上查詢，結果：

>db.person.find()

{ "_id" : ObjectId("533e51da0fb65d4623fe3607"), "id" : 1, "name" : "mongodb1" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3608"), "id" : 2, "name" : "mongodb2" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3609"), "id" : 3, "name" : "mongodb3" }

{ "_id" : ObjectId("533e51da0fb65d4623fe360a"), "id" : 4, "name" : "mongodb4" }

{ "_id" : ObjectId("533e51da0fb65d4623fe360b"), "id" : 5, "name" : "mongodb5" }

{ "_id" : ObjectId("533e51da0fb65d4623fe360c"), "id" : 6, "name" : "mongodb6" }

{ "_id" : ObjectId("533e51da0fb65d4623fe360d"), "id" : 7, "name" : "mongodb7" }

{ "_id" : ObjectId("533e51da0fb65d4623fe360e"), "id" : 8, "name" : "mongodb8" }

{ "_id" : ObjectId("533e51da0fb65d4623fe360f"), "id" : 9, "name" : "mongodb9" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3610"), "id" : 10, "name" : "mongodb10" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3611"), "id" : 11, "name" : "mongodb11" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3612"), "id" : 12, "name" : "mongodb12" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3613"), "id" : 13, "name" : "mongodb13" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3614"), "id" : 14, "name" : "mongodb14" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3615"), "id" : 15, "name" : "mongodb15" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3616"), "id" : 16, "name" : "mongodb16" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3617"), "id" : 17, "name" : "mongodb17" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3618"), "id" : 18, "name" : "mongodb18" }

{ "_id" : ObjectId("533e51da0fb65d4623fe3619"), "id" : 19, "name" : "mongodb19" }

{ "_id" : ObjectId("533e51da0fb65d4623fe361a"), "id" : 20, "name" : "mongodb20" }

Type "it" for more

而同時在第一個副本集上查詢，結果為空，表明它與第二副本集資料不是相通的。

兩個副本集同時關閉，再重新開機，

./mongo 10.4.4.4:27017

檢視rs

>rs.status()

{

"set" : "mongodb_set",

"date" : ISODate("2014-04-04T06:58:22Z"),

"myState" : 2,

"syncingTo" : "10.4.4.5:27017",

"members" : [

{

"_id" : 0,

"name" : "10.4.4.4:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 135,

"optime" : Timestamp(1396594084, 4268),

"optimeDate" : ISODate("2014-04-04T06:48:04Z"),

"self" : true

{

"_id" : 1,

"name" : "10.4.4.5:27017",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 133,

"optime" : Timestamp(1396594084, 4268),

"optimeDate" : ISODate("2014-04-04T06:48:04Z"),

"lastHeartbeat" : ISODate("2014-04-04T06:58:21Z"),

"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),

"pingMs" : 0

}

"ok" : 1

}

注意到，這時候副本集一由當初的兩個primary狀态轉變為正常的primary和secondary。由于現在連接配接的secondary節點，無法正常查詢。

執行

>db.getMongo().setSlaveOk();