Mongodb

優先級較小的Mongo節點還沒有退出

  • November 29, 2021

我有一個三節點副本，我更喜歡 a10.0.0.5作為主要副本。我剛剛在一次性能測試中意識到這10.0.0.2是主要的。我認為它應該自動退出，因為它的優先級較低。我手動退出，但它仍然是主要的。知道我配置不正確嗎？

rs_bud:PRIMARY> version();
4.4.8

rs_bud:PRIMARY> rs.conf();
{
       "_id" : "rs_bud",
       "version" : 2,
       "term" : 13,
       "protocolVersion" : NumberLong(1),
       "writeConcernMajorityJournalDefault" : true,
       "members" : [
               {
                       "_id" : 0,
                       "host" : "10.0.0.4:27017",
                       "arbiterOnly" : false,
                       "buildIndexes" : true,
                       "hidden" : false,
                       "priority" : 2,
                       "tags" : {},
                       "slaveDelay" : NumberLong(0),
                       "votes" : 1
               },
               {
                       "_id" : 1,
                       "host" : "10.0.0.5:27017",
                       "arbiterOnly" : false,
                       "buildIndexes" : true,
                       "hidden" : false,
                       "priority" : 1,
                       "tags" : {},
                       "slaveDelay" : NumberLong(0),
                       "votes" : 1
               },
               {
                       "_id" : 2,
                       "host" : "10.0.0.2:27017",
                       "arbiterOnly" : false,
                       "buildIndexes" : true,
                       "hidden" : false,
                       "priority" : 5,
                       "tags" : {},
                       "slaveDelay" : NumberLong(0),
                       "votes" : 1
               }
       ],
       "settings" : {
               "chainingAllowed" : true,
               "heartbeatIntervalMillis" : 2000,
               "heartbeatTimeoutSecs" : 10,
               "electionTimeoutMillis" : 10000,
               "catchUpTimeoutMillis" : -1,
               "catchUpTakeoverDelayMillis" : 30000,
               "getLastErrorModes" : {

               },
               "getLastErrorDefaults" : {
                       "w" : 1,
                       "wtimeout" : 0
               },
               "replicaSetId" : ObjectId("612bc65e0d5e82841e5c9182")
       }
}

rs_bud:PRIMARY> rs.status()
{
       "set" : "rs_bud",
       "date" : ISODate("2021-11-28T19:10:41.915Z"),
       "myState" : 1,
       "term" : NumberLong(11),
       "syncSourceHost" : "",
       "syncSourceId" : -1,
       "heartbeatIntervalMillis" : NumberLong(2000),
       "majorityVoteCount" : 2,
       "writeMajorityCount" : 2,
       "votingMembersCount" : 3,
       "writableVotingMembersCount" : 3,
       "optimes" : {
               "lastCommittedOpTime" : {
                       "ts" : Timestamp(1638126639, 1),
                       "t" : NumberLong(11)
               },
               "lastCommittedWallTime" : ISODate("2021-11-28T19:10:39.580Z"),
               "readConcernMajorityOpTime" : {
                       "ts" : Timestamp(1638126639, 1),
                       "t" : NumberLong(11)
               },
               "readConcernMajorityWallTime" : ISODate("2021-11-28T19:10:39.580Z"),
               "appliedOpTime" : {
                       "ts" : Timestamp(1638126639, 1),
                       "t" : NumberLong(11)
               },
               "durableOpTime" : {
                       "ts" : Timestamp(1638126639, 1),
                       "t" : NumberLong(11)
               },
               "lastAppliedWallTime" : ISODate("2021-11-28T19:10:39.580Z"),
               "lastDurableWallTime" : ISODate("2021-11-28T19:10:39.580Z")
       },
       "lastStableRecoveryTimestamp" : Timestamp(1638126589, 1),
       "electionCandidateMetrics" : {
               "lastElectionReason" : "priorityTakeover",
               "lastElectionDate" : ISODate("2021-10-12T11:22:33.609Z"),
               "electionTerm" : NumberLong(11),
               "lastCommittedOpTimeAtElection" : {
                       "ts" : Timestamp(1634037753, 1),
                       "t" : NumberLong(10)
               },
               "lastSeenOpTimeAtElection" : {
                       "ts" : Timestamp(1634037753, 1),
                       "t" : NumberLong(10)
               },
               "numVotesNeeded" : 2,
               "priorityAtElection" : 5,
               "electionTimeoutMillis" : NumberLong(10000),
               "priorPrimaryMemberId" : 0,
               "numCatchUpOps" : NumberLong(0),
               "newTermStartDate" : ISODate("2021-10-12T11:22:33.620Z"),
               "wMajorityWriteAvailabilityDate" : ISODate("2021-10-12T11:22:33.719Z")
       },
       "electionParticipantMetrics" : {
               "votedForCandidate" : false,
               "electionTerm" : NumberLong(10),
               "lastVoteDate" : ISODate("2021-10-12T11:22:20.240Z"),
               "electionCandidateMemberId" : 0,
               "voteReason" : "candidate's data is staler than mine. candidate's last applied OpTime: { ts: Timestamp(1634037726, 1), t: 9 }, my last applied OpTime: { ts: Timestamp(1634037736, 1), t: 9 }",
               "lastAppliedOpTimeAtElection" : {
                       "ts" : Timestamp(1634037736, 1),
                       "t" : NumberLong(9)
               },
               "maxAppliedOpTimeInSet" : {
                       "ts" : Timestamp(1634037736, 1),
                       "t" : NumberLong(9)
               },
               "priorityAtElection" : 5
       },
       "members" : [
               {
                       "_id" : 0,
                       "name" : "10.0.0.4:27017",
                       "health" : 1,
                       "state" : 2,
                       "stateStr" : "SECONDARY",
                       "uptime" : 4088900,
                       "optime" : {
                               "ts" : Timestamp(1638126639, 1),
                               "t" : NumberLong(11)
                       },
                       "optimeDurable" : {
                               "ts" : Timestamp(1638126639, 1),
                               "t" : NumberLong(11)
                       },
                       "optimeDate" : ISODate("2021-11-28T19:10:39Z"),
                       "optimeDurableDate" : ISODate("2021-11-28T19:10:39Z"),
                       "lastHeartbeat" : ISODate("2021-11-28T19:10:40.826Z"),
                       "lastHeartbeatRecv" : ISODate("2021-11-28T19:10:40.095Z"),
                       "pingMs" : NumberLong(0),
                       "lastHeartbeatMessage" : "",
                       "syncSourceHost" : "10.0.0.2:27017",
                       "syncSourceId" : 2,
                       "infoMessage" : "",
                       "configVersion" : 2,
                       "configTerm" : 11
               },
               {
                       "_id" : 1,
                       "name" : "10.0.0.5:27017",
                       "health" : 1,
                       "state" : 2,
                       "stateStr" : "SECONDARY",
                       "uptime" : 6051201,
                       "optime" : {
                               "ts" : Timestamp(1638126639, 1),
                               "t" : NumberLong(11)
                       },
                       "optimeDurable" : {
                               "ts" : Timestamp(1638126639, 1),
                               "t" : NumberLong(11)
                       },
                       "optimeDate" : ISODate("2021-11-28T19:10:39Z"),
                       "optimeDurableDate" : ISODate("2021-11-28T19:10:39Z"),
                       "lastHeartbeat" : ISODate("2021-11-28T19:10:41.206Z"),
                       "lastHeartbeatRecv" : ISODate("2021-11-28T19:10:41.510Z"),
                       "pingMs" : NumberLong(0),
                       "lastHeartbeatMessage" : "",
                       "syncSourceHost" : "10.0.0.2:27017",
                       "syncSourceId" : 2,
                       "infoMessage" : "",
                       "configVersion" : 2,
                       "configTerm" : 11
               },
               {
                       "_id" : 2,
                       "name" : "10.0.0.2:27017",
                       "health" : 1,
                       "state" : 1,
                       "stateStr" : "PRIMARY",
                       "uptime" : 6051201,
                       "optime" : {
                               "ts" : Timestamp(1638126639, 1),
                               "t" : NumberLong(11)
                       },
                       "optimeDate" : ISODate("2021-11-28T19:10:39Z"),
                       "syncSourceHost" : "",
                       "syncSourceId" : -1,
                       "infoMessage" : "",
                       "electionTime" : Timestamp(1634037753, 2),
                       "electionDate" : ISODate("2021-10-12T11:22:33Z"),
                       "configVersion" : 2,
                       "configTerm" : 11,
                       "self" : true,
                       "lastHeartbeatMessage" : ""
               }
       ],
       "ok" : 1,
       "$clusterTime" : {
               "clusterTime" : Timestamp(1638126639, 1),
               "signature" : {
                       "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                       "keyId" : NumberLong(0)
               }
       },
       "operationTime" : Timestamp(1638126639, 1)
}

rs_bud:PRIMARY> rs.stepDown(120)
{
       "ok" : 1,
       "$clusterTime" : {
               "clusterTime" : Timestamp(1638126759, 1),
               "signature" : {
                       "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                       "keyId" : NumberLong(0)
               }
       },
       "operationTime" : Timestamp(1638126759, 1)
}

rs_bud:PRIMARY> rs.status()
{
       "set" : "rs_bud",
       "date" : ISODate("2021-11-28T19:32:15.609Z"),
       "myState" : 1,
       "term" : NumberLong(13),
       "syncSourceHost" : "",
       "syncSourceId" : -1,
       "heartbeatIntervalMillis" : NumberLong(2000),
       "majorityVoteCount" : 2,
       "writeMajorityCount" : 2,
       "votingMembersCount" : 3,
       "writableVotingMembersCount" : 3,
       "optimes" : {
               "lastCommittedOpTime" : {
                       "ts" : Timestamp(1638127934, 1),
                       "t" : NumberLong(13)
               },
               "lastCommittedWallTime" : ISODate("2021-11-28T19:32:14.137Z"),
               "readConcernMajorityOpTime" : {
                       "ts" : Timestamp(1638127934, 1),
                       "t" : NumberLong(13)
               },
               "readConcernMajorityWallTime" : ISODate("2021-11-28T19:32:14.137Z"),
               "appliedOpTime" : {
                       "ts" : Timestamp(1638127934, 1),
                       "t" : NumberLong(13)
               },
               "durableOpTime" : {
                       "ts" : Timestamp(1638127934, 1),
                       "t" : NumberLong(13)
               },
               "lastAppliedWallTime" : ISODate("2021-11-28T19:32:14.137Z"),
               "lastDurableWallTime" : ISODate("2021-11-28T19:32:14.137Z")
       },
       "lastStableRecoveryTimestamp" : Timestamp(1638127904, 1),
       "electionCandidateMetrics" : {
               "lastElectionReason" : "priorityTakeover",
               "lastElectionDate" : ISODate("2021-11-28T19:14:44.084Z"),
               "electionTerm" : NumberLong(13),
               "lastCommittedOpTimeAtElection" : {
                       "ts" : Timestamp(1638126883, 1),
                       "t" : NumberLong(12)
               },
               "lastSeenOpTimeAtElection" : {
                       "ts" : Timestamp(1638126883, 1),
                       "t" : NumberLong(12)
               },
               "numVotesNeeded" : 2,
               "priorityAtElection" : 5,
               "electionTimeoutMillis" : NumberLong(10000),
               "priorPrimaryMemberId" : 0,
               "numCatchUpOps" : NumberLong(0),
               "newTermStartDate" : ISODate("2021-11-28T19:14:44.097Z"),
               "wMajorityWriteAvailabilityDate" : ISODate("2021-11-28T19:14:45.099Z")
       },
       "electionParticipantMetrics" : {
               "votedForCandidate" : true,
               "electionTerm" : NumberLong(12),
               "lastVoteDate" : ISODate("2021-11-28T19:12:43.830Z"),
               "electionCandidateMemberId" : 0,
               "voteReason" : "",
               "lastAppliedOpTimeAtElection" : {
                       "ts" : Timestamp(1638126759, 1),
                       "t" : NumberLong(11)
               },
               "maxAppliedOpTimeInSet" : {
                       "ts" : Timestamp(1638126759, 1),
                       "t" : NumberLong(11)
               },
               "priorityAtElection" : 5
       },
       "members" : [
               {
                       "_id" : 0,
                       "name" : "10.0.0.4:27017",
                       "health" : 1,
                       "state" : 2,
                       "stateStr" : "SECONDARY",
                       "uptime" : 4090193,
                       "optime" : {
                               "ts" : Timestamp(1638127934, 1),
                               "t" : NumberLong(13)
                       },
                       "optimeDurable" : {
                               "ts" : Timestamp(1638127934, 1),
                               "t" : NumberLong(13)
                       },
                       "optimeDate" : ISODate("2021-11-28T19:32:14Z"),
                       "optimeDurableDate" : ISODate("2021-11-28T19:32:14Z"),
                       "lastHeartbeat" : ISODate("2021-11-28T19:32:14.634Z"),
                       "lastHeartbeatRecv" : ISODate("2021-11-28T19:32:13.662Z"),
                       "pingMs" : NumberLong(0),
                       "lastHeartbeatMessage" : "",
                       "syncSourceHost" : "10.0.0.2:27017",
                       "syncSourceId" : 2,
                       "infoMessage" : "",
                       "configVersion" : 2,
                       "configTerm" : 13
               },
               {
                       "_id" : 1,
                       "name" : "10.0.0.5:27017",
                       "health" : 1,
                       "state" : 2,
                       "stateStr" : "SECONDARY",
                       "uptime" : 6052494,
                       "optime" : {
                               "ts" : Timestamp(1638127934, 1),
                               "t" : NumberLong(13)
                       },
                       "optimeDurable" : {
                               "ts" : Timestamp(1638127934, 1),
                               "t" : NumberLong(13)
                       },
                       "optimeDate" : ISODate("2021-11-28T19:32:14Z"),
                       "optimeDurableDate" : ISODate("2021-11-28T19:32:14Z"),
                       "lastHeartbeat" : ISODate("2021-11-28T19:32:14.847Z"),
                       "lastHeartbeatRecv" : ISODate("2021-11-28T19:32:14.933Z"),
                       "pingMs" : NumberLong(0),
                       "lastHeartbeatMessage" : "",
                       "syncSourceHost" : "10.0.0.4:27017",
                       "syncSourceId" : 0,
                       "infoMessage" : "",
                       "configVersion" : 2,
                       "configTerm" : 13
               },
               {
                       "_id" : 2,
                       "name" : "10.0.0.2:27017",
                       "health" : 1,
                       "state" : 1,
                       "stateStr" : "PRIMARY",
                       "uptime" : 6052495,
                       "optime" : {
                               "ts" : Timestamp(1638127934, 1),
                               "t" : NumberLong(13)
                       },
                       "optimeDate" : ISODate("2021-11-28T19:32:14Z"),
                       "syncSourceHost" : "",
                       "syncSourceId" : -1,
                       "infoMessage" : "",
                       "electionTime" : Timestamp(1638126884, 1),
                       "electionDate" : ISODate("2021-11-28T19:14:44Z"),
                       "configVersion" : 2,
                       "configTerm" : 13,
                       "self" : true,
                       "lastHeartbeatMessage" : ""
               }
       ],
       "ok" : 1,
       "$clusterTime" : {
               "clusterTime" : Timestamp(1638127934, 1),
               "signature" : {
                       "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                       "keyId" : NumberLong(0)
               }
       },
       "operationTime" : Timestamp(1638127934, 1)
}

更新 - 重新配置過程

cfg["members"][0]["priority"] = 10;
cfg["members"][1]["priority"] = 5;
cfg["members"][2]["priority"] = 1;
rs.reconfig(cfg);
{
       "ok" : 1,
       "$clusterTime" : {
               "clusterTime" : Timestamp(1638213674, 1),
               "signature" : {
                       "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                       "keyId" : NumberLong(0)
               }
       },
       "operationTime" : Timestamp(1638213674, 1)
}

rs.stepDown(20)

答案是優先級…更高的優先級獲勝。因此，“host”：“10.0.0.2:27017”，“priority”：5 贏得了對“host”的選舉：“10.0.0.5:27017”，“priority”：1。

解決方案是將優先級 5 分配給節點 10.0.0.5，將優先級 1 分配給該節點 10.0.0.2

引用自：https://dba.stackexchange.com/questions/303222

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