• MongoDB副本集调整节点

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    77406ddb6b83fc81dee9257424f3f9f1.png

    MongoDB的副本集（Replica Set）是一个高可用性、可扩展性和冗余性的数据库解决方案。它能够确保数据库的高可用性，同时保障了数据的安全性。在本文中，我们将探讨如何在一个已经包含三个数据节点的副本集集群中，添加一个仲裁节点，并同时删除原先的一个数据节点。


    1. 副本集的基本概念
    MongoDB副本集由多个数据节点+若干个仲裁节点（可以没有）组成，其中一个数据节点被选举为主节点(Primary），其余节点为次要节点（Secondary）。在故障时，副本集会自动进行主节点的切换，确保服务的高可用性。副本集中的仲裁节点（Arbiter）不存储数据，仅用于选举过程，帮助副本集进行决策。

    例如，当前配置一个3节点的数据节点集群，组件集群命令如下：

    1. > use admin
    2. > rs.initiate( {_id: "test1",members: [{ _id: 0, host: "192.168.122.36:27017" },{ _id: 1, host: "192.168.122.36:27018" },{ _id: 2, host: "192.168.122.36:27019" } ] })

    31dedc88568c8d8436a7178aad72f7f8.png

    查看状态：

    1. test1:PRIMARY> use admin
    2. switched to db admin
    3. test1:PRIMARY> rs.status()
    4. {
    5.         "set" : "test1",
    6.         "date" : ISODate("2023-10-23T02:31:02.345Z"),
    7.         "myState" : 1,
    8.         "term" : NumberLong(1),
    9.         "syncingTo" : "",
    10.         "syncSourceHost" : "",
    11.         "syncSourceId" : -1,
    12.         "heartbeatIntervalMillis" : NumberLong(2000),
    13.         "majorityVoteCount" : 2,
    14.         "writeMajorityCount" : 2,
    15.         "optimes" : {
    16.                 "lastCommittedOpTime" : {
    17.                         "ts" : Timestamp(1698028254, 1),
    18.                         "t" : NumberLong(1)
    19.                 },
    20.                 "lastCommittedWallTime" : ISODate("2023-10-23T02:30:54.919Z"),
    21.                 "readConcernMajorityOpTime" : {
    22.                         "ts" : Timestamp(1698028254, 1),
    23.                         "t" : NumberLong(1)
    24.                 },
    25.                 "readConcernMajorityWallTime" : ISODate("2023-10-23T02:30:54.919Z"),
    26.                 "appliedOpTime" : {
    27.                         "ts" : Timestamp(1698028254, 1),
    28.                         "t" : NumberLong(1)
    29.                 },
    30.                 "durableOpTime" : {
    31.                         "ts" : Timestamp(1698028254, 1),
    32.                         "t" : NumberLong(1)
    33.                 },
    34.                 "lastAppliedWallTime" : ISODate("2023-10-23T02:30:54.919Z"),
    35.                 "lastDurableWallTime" : ISODate("2023-10-23T02:30:54.919Z")
    36.         },
    37.         "lastStableRecoveryTimestamp" : Timestamp(1698028224, 3),
    38.         "lastStableCheckpointTimestamp" : Timestamp(1698028224, 3),
    39.         "electionCandidateMetrics" : {
    40.                 "lastElectionReason" : "electionTimeout",
    41.                 "lastElectionDate" : ISODate("2023-10-23T02:30:24.838Z"),
    42.                 "electionTerm" : NumberLong(1),
    43.                 "lastCommittedOpTimeAtElection" : {
    44.                         "ts" : Timestamp(0, 0),
    45.                         "t" : NumberLong(-1)
    46.                 },
    47.                 "lastSeenOpTimeAtElection" : {
    48.                         "ts" : Timestamp(1698028214, 1),
    49.                         "t" : NumberLong(-1)
    50.                 },
    51.                 "numVotesNeeded" : 2,
    52.                 "priorityAtElection" : 1,
    53.                 "electionTimeoutMillis" : NumberLong(10000),
    54.                 "numCatchUpOps" : NumberLong(0),
    55.                 "newTermStartDate" : ISODate("2023-10-23T02:30:24.912Z"),
    56.                 "wMajorityWriteAvailabilityDate" : ISODate("2023-10-23T02:30:25.497Z")
    57.         },
    58.         "members" : [
    59.                 {
    60.                         "_id" : 0,
    61.                         "name" : "192.168.122.36:27017",
    62.                         "health" : 1,
    63.                         "state" : 1,
    64.                         "stateStr" : "PRIMARY",
    65.                         "uptime" : 183,
    66.                         "optime" : {
    67.                                 "ts" : Timestamp(1698028254, 1),
    68.                                 "t" : NumberLong(1)
    69.                         },
    70.                         "optimeDate" : ISODate("2023-10-23T02:30:54Z"),
    71.                         "syncingTo" : "",
    72.                         "syncSourceHost" : "",
    73.                         "syncSourceId" : -1,
    74.                         "infoMessage" : "could not find member to sync from",
    75.                         "electionTime" : Timestamp(1698028224, 1),
    76.                         "electionDate" : ISODate("2023-10-23T02:30:24Z"),
    77.                         "configVersion" : 1,
    78.                         "self" : true,
    79.                         "lastHeartbeatMessage" : ""
    80.                 },
    81.                 {
    82.                         "_id" : 1,
    83.                         "name" : "192.168.122.36:27018",
    84.                         "health" : 1,
    85.                         "state" : 2,
    86.                         "stateStr" : "SECONDARY",
    87.                         "uptime" : 47,
    88.                         "optime" : {
    89.                                 "ts" : Timestamp(1698028254, 1),
    90.                                 "t" : NumberLong(1)
    91.                         },
    92.                         "optimeDurable" : {
    93.                                 "ts" : Timestamp(1698028254, 1),
    94.                                 "t" : NumberLong(1)
    95.                         },
    96.                         "optimeDate" : ISODate("2023-10-23T02:30:54Z"),
    97.                         "optimeDurableDate" : ISODate("2023-10-23T02:30:54Z"),
    98.                         "lastHeartbeat" : ISODate("2023-10-23T02:31:00.889Z"),
    99.                         "lastHeartbeatRecv" : ISODate("2023-10-23T02:31:01.443Z"),
    100.                         "pingMs" : NumberLong(0),
    101.                         "lastHeartbeatMessage" : "",
    102.                         "syncingTo" : "192.168.122.36:27017",
    103.                         "syncSourceHost" : "192.168.122.36:27017",
    104.                         "syncSourceId" : 0,
    105.                         "infoMessage" : "",
    106.                         "configVersion" : 1
    107.                 },
    108.                 {
    109.                         "_id" : 2,
    110.                         "name" : "192.168.122.36:27019",
    111.                         "health" : 1,
    112.                         "state" : 2,
    113.                         "stateStr" : "SECONDARY",
    114.                         "uptime" : 47,
    115.                         "optime" : {
    116.                                 "ts" : Timestamp(1698028254, 1),
    117.                                 "t" : NumberLong(1)
    118.                         },
    119.                         "optimeDurable" : {
    120.                                 "ts" : Timestamp(1698028254, 1),
    121.                                 "t" : NumberLong(1)
    122.                         },
    123.                         "optimeDate" : ISODate("2023-10-23T02:30:54Z"),
    124.                         "optimeDurableDate" : ISODate("2023-10-23T02:30:54Z"),
    125.                         "lastHeartbeat" : ISODate("2023-10-23T02:31:00.890Z"),
    126.                         "lastHeartbeatRecv" : ISODate("2023-10-23T02:31:01.446Z"),
    127.                         "pingMs" : NumberLong(0),
    128.                         "lastHeartbeatMessage" : "",
    129.                         "syncingTo" : "192.168.122.36:27017",
    130.                         "syncSourceHost" : "192.168.122.36:27017",
    131.                         "syncSourceId" : 0,
    132.                         "infoMessage" : "",
    133.                         "configVersion" : 1
    134.                 }
    135.         ],
    136.         "ok" : 1,
    137.         "$clusterTime" : {
    138.                 "clusterTime" : Timestamp(1698028254, 1),
    139.                 "signature" : {
    140.                         "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
    141.                         "keyId" : NumberLong(0)
    142.                 }
    143.         },
    144.         "operationTime" : Timestamp(1698028254, 1)
    145. }

    此时可以用一个程序验证集群的可用情况：

    1. from pymongo import MongoClient
    2. from pymongo.errors import ConnectionFailure
    3.  
    4.  
    5. # MongoDB副本集的连接信息
    6. replica_set = "test1"
    7. mongo_host = ["192.168.122.36:27017", "192.168.122.36:27018", "192.168.122.36:27019"]  # 主机和端口号列表
    8.  
    9.  
    10. # 尝试连接MongoDB副本集
    11. try:
    12.     client = MongoClient(mongo_host, replicaSet=replica_set, serverSelectionTimeoutMS=5000)
    13.     db = client["testdb"]
    14.     print("Successfully connected to MongoDB replica set.")
    15.     collection = db['test1']
    16.     data = {"b":2}
    17.     result = collection.insert_one(data)
    18.  
    19.  
    20.  
    21.  
    22. except ConnectionFailure:
    23.     print("Failed to connect to MongoDB replica set. Please check your connection settings.")

    运行结果如下：

    e33d11f7fabdced4502342c29278f149.png

    查看数据库中运行结果：

    2eb01cc0682f2af3bf95cd9268b6ea92.png


    2. 添加节点
    要添加一个仲裁节点，我们需要在现有副本集中的任一节点上执行如下操作：

    rs.add( { host: "IP:PORT", arbiterOnly:true } )

    执行这个命令后，MongoDB将会在副本集中添加一个仲裁节点，增加了选主的稳定性，同时不会增加数据存储的压力。具体实际案例如下

    1. test1:PRIMARY> use  admin
    2. switched to db admin
    3. test1:PRIMARY> rs.add( { host: "192.168.122.36:27020", arbiterOnly:true } )
    4. {
    5.         "ok" : 1,
    6.         "$clusterTime" : {
    7.                 "clusterTime" : Timestamp(1698030806, 1),
    8.                 "signature" : {
    9.                         "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
    10.                         "keyId" : NumberLong(0)
    11.                 }
    12.         },
    13.         "operationTime" : Timestamp(1698030806, 1)
    14. }
    15. test1:PRIMARY> rs.status();
    16. {
    17.         "set" : "test1",
    18.         "date" : ISODate("2023-10-23T03:13:32.511Z"),
    19.         "myState" : 1,
    20.         "term" : NumberLong(1),
    21.         "syncingTo" : "",
    22.         "syncSourceHost" : "",
    23.         "syncSourceId" : -1,
    24.         "heartbeatIntervalMillis" : NumberLong(2000),
    25.         "majorityVoteCount" : 3,
    26.         "writeMajorityCount" : 3,
    27.         "optimes" : {
    28.                 "lastCommittedOpTime" : {
    29.                         "ts" : Timestamp(1698030806, 1),
    30.                         "t" : NumberLong(1)
    31.                 },
    32.                 "lastCommittedWallTime" : ISODate("2023-10-23T03:13:26.379Z"),
    33.                 "readConcernMajorityOpTime" : {
    34.                         "ts" : Timestamp(1698030806, 1),
    35.                         "t" : NumberLong(1)
    36.                 },
    37.                 "readConcernMajorityWallTime" : ISODate("2023-10-23T03:13:26.379Z"),
    38.                 "appliedOpTime" : {
    39.                         "ts" : Timestamp(1698030806, 1),
    40.                         "t" : NumberLong(1)
    41.                 },
    42.                 "durableOpTime" : {
    43.                         "ts" : Timestamp(1698030806, 1),
    44.                         "t" : NumberLong(1)
    45.                 },
    46.                 "lastAppliedWallTime" : ISODate("2023-10-23T03:13:26.379Z"),
    47.                 "lastDurableWallTime" : ISODate("2023-10-23T03:13:26.379Z")
    48.         },
    49.         "lastStableRecoveryTimestamp" : Timestamp(1698030805, 1),
    50.         "lastStableCheckpointTimestamp" : Timestamp(1698030805, 1),
    51.         "electionCandidateMetrics" : {
    52.                 "lastElectionReason" : "electionTimeout",
    53.                 "lastElectionDate" : ISODate("2023-10-23T02:30:24.838Z"),
    54.                 "electionTerm" : NumberLong(1),
    55.                 "lastCommittedOpTimeAtElection" : {
    56.                         "ts" : Timestamp(0, 0),
    57.                         "t" : NumberLong(-1)
    58.                 },
    59.                 "lastSeenOpTimeAtElection" : {
    60.                         "ts" : Timestamp(1698028214, 1),
    61.                         "t" : NumberLong(-1)
    62.                 },
    63.                 "numVotesNeeded" : 2,
    64.                 "priorityAtElection" : 1,
    65.                 "electionTimeoutMillis" : NumberLong(10000),
    66.                 "numCatchUpOps" : NumberLong(0),
    67.                 "newTermStartDate" : ISODate("2023-10-23T02:30:24.912Z"),
    68.                 "wMajorityWriteAvailabilityDate" : ISODate("2023-10-23T02:30:25.497Z")
    69.         },
    70.         "members" : [
    71.                 {
    72.                         "_id" : 0,
    73.                         "name" : "192.168.122.36:27017",
    74.                         "health" : 1,
    75.                         "state" : 1,
    76.                         "stateStr" : "PRIMARY",
    77.                         "uptime" : 2733,
    78.                         "optime" : {
    79.                                 "ts" : Timestamp(1698030806, 1),
    80.                                 "t" : NumberLong(1)
    81.                         },
    82.                         "optimeDate" : ISODate("2023-10-23T03:13:26Z"),
    83.                         "syncingTo" : "",
    84.                         "syncSourceHost" : "",
    85.                         "syncSourceId" : -1,
    86.                         "infoMessage" : "",
    87.                         "electionTime" : Timestamp(1698028224, 1),
    88.                         "electionDate" : ISODate("2023-10-23T02:30:24Z"),
    89.                         "configVersion" : 2,
    90.                         "self" : true,
    91.                         "lastHeartbeatMessage" : ""
    92.                 },
    93.                 {
    94.                         "_id" : 1,
    95.                         "name" : "192.168.122.36:27018",
    96.                         "health" : 1,
    97.                         "state" : 2,
    98.                         "stateStr" : "SECONDARY",
    99.                         "uptime" : 2597,
    100.                         "optime" : {
    101.                                 "ts" : Timestamp(1698030806, 1),
    102.                                 "t" : NumberLong(1)
    103.                         },
    104.                         "optimeDurable" : {
    105.                                 "ts" : Timestamp(1698030806, 1),
    106.                                 "t" : NumberLong(1)
    107.                         },
    108.                         "optimeDate" : ISODate("2023-10-23T03:13:26Z"),
    109.                         "optimeDurableDate" : ISODate("2023-10-23T03:13:26Z"),
    110.                         "lastHeartbeat" : ISODate("2023-10-23T03:13:32.393Z"),
    111.                         "lastHeartbeatRecv" : ISODate("2023-10-23T03:13:32.420Z"),
    112.                         "pingMs" : NumberLong(1),
    113.                         "lastHeartbeatMessage" : "",
    114.                         "syncingTo" : "",
    115.                         "syncSourceHost" : "",
    116.                         "syncSourceId" : -1,
    117.                         "infoMessage" : "",
    118.                         "configVersion" : 2
    119.                 },
    120.                 {
    121.                         "_id" : 2,
    122.                         "name" : "192.168.122.36:27019",
    123.                         "health" : 1,
    124.                         "state" : 2,
    125.                         "stateStr" : "SECONDARY",
    126.                         "uptime" : 2597,
    127.                         "optime" : {
    128.                                 "ts" : Timestamp(1698030806, 1),
    129.                                 "t" : NumberLong(1)
    130.                         },
    131.                         "optimeDurable" : {
    132.                                 "ts" : Timestamp(1698030806, 1),
    133.                                 "t" : NumberLong(1)
    134.                         },
    135.                         "optimeDate" : ISODate("2023-10-23T03:13:26Z"),
    136.                         "optimeDurableDate" : ISODate("2023-10-23T03:13:26Z"),
    137.                         "lastHeartbeat" : ISODate("2023-10-23T03:13:32.393Z"),
    138.                         "lastHeartbeatRecv" : ISODate("2023-10-23T03:13:32.445Z"),
    139.                         "pingMs" : NumberLong(1),
    140.                         "lastHeartbeatMessage" : "",
    141.                         "syncingTo" : "",
    142.                         "syncSourceHost" : "",
    143.                         "syncSourceId" : -1,
    144.                         "infoMessage" : "",
    145.                         "configVersion" : 2
    146.                 },
    147.                 {
    148.                         "_id" : 3,
    149.                         "name" : "192.168.122.36:27020",
    150.                         "health" : 1,
    151.                         "state" : 7,
    152.                         "stateStr" : "ARBITER",
    153.                         "uptime" : 6,
    154.                         "lastHeartbeat" : ISODate("2023-10-23T03:13:32.405Z"),
    155.                         "lastHeartbeatRecv" : ISODate("2023-10-23T03:13:32.455Z"),
    156.                         "pingMs" : NumberLong(4),
    157.                         "lastHeartbeatMessage" : "",
    158.                         "syncingTo" : "",
    159.                         "syncSourceHost" : "",
    160.                         "syncSourceId" : -1,
    161.                         "infoMessage" : "",
    162.                         "configVersion" : 2
    163.                 }
    164.         ],
    165.         "ok" : 1,
    166.         "$clusterTime" : {
    167.                 "clusterTime" : Timestamp(1698030806, 1),
    168.                 "signature" : {
    169.                         "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
    170.                         "keyId" : NumberLong(0)
    171.                 }
    172.         },
    173.         "operationTime" : Timestamp(1698030806, 1)
    174. }

    此时修改python中程序（插入的数据），运行结果如下：

    da5eec3d48507bcdbd63921f39fc8e13.png

    3.  删除数据节点
    如果你需要删除一个数据节点，首先，你要确保副本集的健康状态，然后执行如下操作来删除一个Secondary节点。

    rs.remove("IP:PORT");

    执行这个命令后，MongoDB将从副本集中移除该数据节点，副本集会重新进行选举，确保副本集的高可用性。

    1. test1:PRIMARY> rs.remove("192.168.122.36:27019")
    2. {
    3.         "ok" : 1,
    4.         "$clusterTime" : {
    5.                 "clusterTime" : Timestamp(1698038888, 1),
    6.                 "signature" : {
    7.                         "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
    8.                         "keyId" : NumberLong(0)
    9.                 }
    10.         },
    11.         "operationTime" : Timestamp(1698038888, 1)
    12. }
    13. test1:PRIMARY> rs.status
    14. function() {
    15.     return db._adminCommand("replSetGetStatus");  # 选举中
    16. }
    17. test1:PRIMARY> rs.status()
    18. {
    19.         "set" : "test1",
    20.         "date" : ISODate("2023-10-23T05:28:15.398Z"),
    21.         "myState" : 1,
    22.         "term" : NumberLong(1),
    23.         "syncingTo" : "",
    24.         "syncSourceHost" : "",
    25.         "syncSourceId" : -1,
    26.         "heartbeatIntervalMillis" : NumberLong(2000),
    27.         "majorityVoteCount" : 2,
    28.         "writeMajorityCount" : 2,
    29.         "optimes" : {
    30.                 "lastCommittedOpTime" : {
    31.                         "ts" : Timestamp(1698038888, 1),
    32.                         "t" : NumberLong(1)
    33.                 },
    34.                 "lastCommittedWallTime" : ISODate("2023-10-23T05:28:08.335Z"),
    35.                 "readConcernMajorityOpTime" : {
    36.                         "ts" : Timestamp(1698038888, 1),
    37.                         "t" : NumberLong(1)
    38.                 },
    39.                 "readConcernMajorityWallTime" : ISODate("2023-10-23T05:28:08.335Z"),
    40.                 "appliedOpTime" : {
    41.                         "ts" : Timestamp(1698038888, 1),
    42.                         "t" : NumberLong(1)
    43.                 },
    44.                 "durableOpTime" : {
    45.                         "ts" : Timestamp(1698038888, 1),
    46.                         "t" : NumberLong(1)
    47.                 },
    48.                 "lastAppliedWallTime" : ISODate("2023-10-23T05:28:08.335Z"),
    49.                 "lastDurableWallTime" : ISODate("2023-10-23T05:28:08.335Z")
    50.         },
    51.         "lastStableRecoveryTimestamp" : Timestamp(1698038845, 1),
    52.         "lastStableCheckpointTimestamp" : Timestamp(1698038845, 1),
    53.         "electionCandidateMetrics" : {
    54.                 "lastElectionReason" : "electionTimeout",
    55.                 "lastElectionDate" : ISODate("2023-10-23T02:30:24.838Z"),
    56.                 "electionTerm" : NumberLong(1),
    57.                 "lastCommittedOpTimeAtElection" : {
    58.                         "ts" : Timestamp(0, 0),
    59.                         "t" : NumberLong(-1)
    60.                 },
    61.                 "lastSeenOpTimeAtElection" : {
    62.                         "ts" : Timestamp(1698028214, 1),
    63.                         "t" : NumberLong(-1)
    64.                 },
    65.                 "numVotesNeeded" : 2,
    66.                 "priorityAtElection" : 1,
    67.                 "electionTimeoutMillis" : NumberLong(10000),
    68.                 "numCatchUpOps" : NumberLong(0),
    69.                 "newTermStartDate" : ISODate("2023-10-23T02:30:24.912Z"),
    70.                 "wMajorityWriteAvailabilityDate" : ISODate("2023-10-23T02:30:25.497Z")
    71.         },
    72.         "members" : [
    73.                 {
    74.                         "_id" : 0,
    75.                         "name" : "192.168.122.36:27017",
    76.                         "health" : 1,
    77.                         "state" : 1,
    78.                         "stateStr" : "PRIMARY",
    79.                         "uptime" : 10816,
    80.                         "optime" : {
    81.                                 "ts" : Timestamp(1698038888, 1),
    82.                                 "t" : NumberLong(1)
    83.                         },
    84.                         "optimeDate" : ISODate("2023-10-23T05:28:08Z"),
    85.                         "syncingTo" : "",
    86.                         "syncSourceHost" : "",
    87.                         "syncSourceId" : -1,
    88.                         "infoMessage" : "",
    89.                         "electionTime" : Timestamp(1698028224, 1),
    90.                         "electionDate" : ISODate("2023-10-23T02:30:24Z"),
    91.                         "configVersion" : 3,
    92.                         "self" : true,
    93.                         "lastHeartbeatMessage" : ""
    94.                 },
    95.                 {
    96.                         "_id" : 1,
    97.                         "name" : "192.168.122.36:27018",
    98.                         "health" : 1,
    99.                         "state" : 2,
    100.                         "stateStr" : "SECONDARY",
    101.                         "uptime" : 10680,
    102.                         "optime" : {
    103.                                 "ts" : Timestamp(1698038888, 1),
    104.                                 "t" : NumberLong(1)
    105.                         },
    106.                         "optimeDurable" : {
    107.                                 "ts" : Timestamp(1698038888, 1),
    108.                                 "t" : NumberLong(1)
    109.                         },
    110.                         "optimeDate" : ISODate("2023-10-23T05:28:08Z"),
    111.                         "optimeDurableDate" : ISODate("2023-10-23T05:28:08Z"),
    112.                         "lastHeartbeat" : ISODate("2023-10-23T05:28:14.347Z"),
    113.                         "lastHeartbeatRecv" : ISODate("2023-10-23T05:28:15.388Z"),
    114.                         "pingMs" : NumberLong(1),
    115.                         "lastHeartbeatMessage" : "",
    116.                         "syncingTo" : "",
    117.                         "syncSourceHost" : "",
    118.                         "syncSourceId" : -1,
    119.                         "infoMessage" : "",
    120.                         "configVersion" : 3
    121.                 },
    122.                 {
    123.                         "_id" : 3,
    124.                         "name" : "192.168.122.36:27020",
    125.                         "health" : 1,
    126.                         "state" : 7,
    127.                         "stateStr" : "ARBITER",
    128.                         "uptime" : 8088,
    129.                         "lastHeartbeat" : ISODate("2023-10-23T05:28:14.342Z"),
    130.                         "lastHeartbeatRecv" : ISODate("2023-10-23T05:28:14.369Z"),
    131.                         "pingMs" : NumberLong(0),
    132.                         "lastHeartbeatMessage" : "",
    133.                         "syncingTo" : "",
    134.                         "syncSourceHost" : "",
    135.                         "syncSourceId" : -1,
    136.                         "infoMessage" : "",
    137.                         "configVersion" : 3
    138.                 }
    139.         ],
    140.         "ok" : 1,
    141.         "$clusterTime" : {
    142.                 "clusterTime" : Timestamp(1698038888, 1),
    143.                 "signature" : {
    144.                         "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
    145.                         "keyId" : NumberLong(0)
    146.                 }
    147.         },
    148.         "operationTime" : Timestamp(1698038888, 1)
    149. }

    注意：复制集将会短暂的关闭连接并进入选举，选举出一个新的主节点。接口将会自动重连。接口可能将会报错 DBClientCursor::init call() failed 。

    9ca11f2ecdc7c55235c38025419219d9.png

    往期精彩回顾

    1.  MySQL高可用之MHA集群部署

    2.  mysql8.0新增用户及加密规则修改的那些事

    3.  比hive快10倍的大数据查询利器-- presto

    4.  监控利器出鞘：Prometheus+Grafana监控MySQL、Redis数据库

    5.  PostgreSQL主从复制--物理复制

    6.  MySQL传统点位复制在线转为GTID模式复制

    7.  MySQL敏感数据加密及解密

    8.  MySQL数据备份及还原（一）

    9.  MySQL数据备份及还原（二）

    310a4d503c1ea9c406914e651413fcd0.png

    扫码关注     

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    c252dc830e264d24960c7280c3c45d22.png

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  • 原文地址：https://blog.csdn.net/gjc592/article/details/134025344