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Type:
Bug
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Resolution: Won't Fix
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Priority:
Critical - P2
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None
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Affects Version/s: 2.1.2
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Component/s: Replication
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ALL
It is possible to configure two secondaries to sync from each other, breaking replication for both:
MongoDB shell version: 2.1.3-pre- connecting to: 127.0.0.1:27018/test foo:SECONDARY> rs.syncFrom('behackett-dt:27019') { "syncFromRequested" : "behackett-dt:27019", "prevSyncTarget" : "behackett-dt:27017", "ok" : 1 } foo:SECONDARY> rs.status() { "set" : "foo", "date" : ISODate("2012-07-17T00:23:47Z"), "myState" : 2, "syncingTo" : "behackett-dt:27019", "members" : [ { "_id" : 0, "name" : "behackett-dt:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 131, "optime" : Timestamp(1342483505000, 1), "optimeDate" : ISODate("2012-07-17T00:05:05Z"), "lastHeartbeat" : ISODate("2012-07-17T00:23:46Z"), "pingMs" : 0 }, { "_id" : 1, "name" : "behackett-dt:27018", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 131, "optime" : Timestamp(1342483505000, 1), "optimeDate" : ISODate("2012-07-17T00:05:05Z"), "errmsg" : "syncing to: behackett-dt:27019 by request", "self" : true }, { "_id" : 2, "name" : "behackett-dt:27019", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 131, "optime" : Timestamp(1342483505000, 1), "optimeDate" : ISODate("2012-07-17T00:05:05Z"), "lastHeartbeat" : ISODate("2012-07-17T00:23:46Z"), "pingMs" : 0, "errmsg" : "syncing to: behackett-dt:27018 by request" }, { "_id" : 3, "name" : "behackett-dt:27020", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 129, "lastHeartbeat" : ISODate("2012-07-17T00:23:46Z"), "pingMs" : 0 } ], "ok" : 1 }
Subsequent write operations are not replicated to either:
foo:SECONDARY> rs.status()
{
"set" : "foo",
"date" : ISODate("2012-07-17T00:26:06Z"),
"myState" : 2,
"syncingTo" : "behackett-dt:27019",
"members" : [
{
"_id" : 0,
"name" : "behackett-dt:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 270,
"optime" : Timestamp(1342484759000, 2),
"optimeDate" : ISODate("2012-07-17T00:25:59Z"),
"lastHeartbeat" : ISODate("2012-07-17T00:26:04Z"),
"pingMs" : 0
},
{
"_id" : 1,
"name" : "behackett-dt:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 270,
"optime" : Timestamp(1342483505000, 1),
"optimeDate" : ISODate("2012-07-17T00:05:05Z"),
"self" : true
},
{
"_id" : 2,
"name" : "behackett-dt:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 270,
"optime" : Timestamp(1342483505000, 1),
"optimeDate" : ISODate("2012-07-17T00:05:05Z"),
"lastHeartbeat" : ISODate("2012-07-17T00:26:04Z"),
"pingMs" : 0
},
{
"_id" : 3,
"name" : "behackett-dt:27020",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER",
"uptime" : 268,
"lastHeartbeat" : ISODate("2012-07-17T00:26:04Z"),
"pingMs" : 0
}
],
"ok" : 1
}
foo:SECONDARY> db.printSlaveReplicationInfo()
source: behackett-dt:27018
syncedTo: Mon Jul 16 2012 17:05:05 GMT-0700 (PDT)
= 1505 secs ago (0.42hrs)
source: behackett-dt:27019
syncedTo: Mon Jul 16 2012 17:05:05 GMT-0700 (PDT)
= 1505 secs ago (0.42hrs)
source: behackett-dt:27020
no replication info, yet. State: ARBITER
Secondaries should check that the requested source isn't already syncing from themselves.