mongodb 中rs.stauts()命令参数解析

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　　rs.status()命令用于获取MongoDB副本集的状态信息。它提供了关于副本集中各个节点的详细信息，包括节点的健康状况、角色、选举状态等。

　　以下是查看一个mongo集群状态返回的参数：

rs0:PRIMARY> rs.status()
{"set" : "rs0","date" : ISODate("2024-09-14T06:44:36.882Z"),"myState" : 1,"term" : NumberLong(510),"syncingTo" : "","syncSourceHost" : "","syncSourceId" : -1,"heartbeatIntervalMillis" : NumberLong(2000),"majorityVoteCount" : 2,"writeMajorityCount" : 2,"optimes" : {"lastCommittedOpTime" : {"ts" : Timestamp(0, 0),"t" : NumberLong(-1)},"lastCommittedWallTime" : ISODate("1970-01-01T00:00:00Z"),"appliedOpTime" : {"ts" : Timestamp(1726296270, 1),"t" : NumberLong(510)},"durableOpTime" : {"ts" : Timestamp(1726296270, 1),"t" : NumberLong(510)},"lastAppliedWallTime" : ISODate("2024-09-14T06:44:30.859Z"),"lastDurableWallTime" : ISODate("2024-09-14T06:44:30.859Z")},"lastStableRecoveryTimestamp" : Timestamp(1725300368, 3),"lastStableCheckpointTimestamp" : Timestamp(1725300368, 3),"electionCandidateMetrics" : {"lastElectionReason" : "electionTimeout","lastElectionDate" : ISODate("2024-09-14T06:28:20.630Z"),"electionTerm" : NumberLong(510),"lastCommittedOpTimeAtElection" : {"ts" : Timestamp(0, 0),"t" : NumberLong(-1)},"lastSeenOpTimeAtElection" : {"ts" : Timestamp(1726284227, 1),"t" : NumberLong(509)},"numVotesNeeded" : 2,"priorityAtElection" : 2,"electionTimeoutMillis" : NumberLong(10000),"numCatchUpOps" : NumberLong(0),"newTermStartDate" : ISODate("2024-09-14T06:28:20.830Z")},"members" : [{"_id" : 0,"name" : "mongo1:27017","health" : 1,"state" : 9,"stateStr" : "ROLLBACK","uptime" : 987,"optime" : {"ts" : Timestamp(1726197065, 1),"t" : NumberLong(505)},"optimeDurable" : {"ts" : Timestamp(1726197065, 1),"t" : NumberLong(505)},"optimeDate" : ISODate("2024-09-13T03:11:05Z"),"optimeDurableDate" : ISODate("2024-09-13T03:11:05Z"),"lastHeartbeat" : ISODate("2024-09-14T06:44:35.841Z"),"lastHeartbeatRecv" : ISODate("2024-09-14T06:44:36.665Z"),"pingMs" : NumberLong(0),"lastHeartbeatMessage" : "","syncingTo" : "mongo2:27017","syncSourceHost" : "mongo2:27017","syncSourceId" : 1,"infoMessage" : "","configVersion" : 1950478},{"_id" : 1,"name" : "mongo2:27017","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 990,"optime" : {"ts" : Timestamp(1726296270, 1),"t" : NumberLong(510)},"optimeDate" : ISODate("2024-09-14T06:44:30Z"),"syncingTo" : "","syncSourceHost" : "","syncSourceId" : -1,"infoMessage" : "","electionTime" : Timestamp(1726295300, 1),"electionDate" : ISODate("2024-09-14T06:28:20Z"),"configVersion" : 1950478,"self" : true,"lastHeartbeatMessage" : ""},{"_id" : 2,"name" : "mongo3:27017","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 987,"optime" : {"ts" : Timestamp(1726197065, 1),"t" : NumberLong(505)},"optimeDurable" : {"ts" : Timestamp(1726197065, 1),"t" : NumberLong(505)},"optimeDate" : ISODate("2024-09-13T03:11:05Z"),"optimeDurableDate" : ISODate("2024-09-13T03:11:05Z"),"lastHeartbeat" : ISODate("2024-09-14T06:44:34.930Z"),"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),"pingMs" : NumberLong(1),"lastHeartbeatMessage" : "","syncingTo" : "","syncSourceHost" : "","syncSourceId" : -1,"infoMessage" : "","configVersion" : 1829326}],"ok" : 1,"$clusterTime" : {"clusterTime" : Timestamp(1726296270, 1),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}},"operationTime" : Timestamp(1726296270, 1)
}
rs0:PRIMARY>

以下是rs.status()响应字段的意义及其对应值的整理：

字段	意义	示例值
set	副本集的名称	"rs0"
date	响应生成的时间	ISODate("2024-09-14T06:44:36Z")
myState	当前节点的状态（1: PRIMARY, 2: SECONDARY, 3: RECOVERING等）： 常见的状态包括： PRIMARY (1): 当前节点是主节点，负责处理所有写入操作。 SECONDARY (2): 当前节点是从节点，复制主节点的数据并提供读取服务。 ARBITER (7): 当前节点是仲裁者，不存储数据，仅参与选举过程。 OTHER (8): 当前节点的状态不属于上述任何一种，通常是由于配置或网络问题。 RECOVERING (9): 当前节点正在恢复中，通常是从不健康状态恢复。 DOWN (10): 当前节点不可用，可能是由于网络问题或故障。 STARTUP (11): 当前节点正在启动，尚未完成初始化。 STARTUP2 (12): 当前节点在启动的第二阶段，正在进行数据同步。 UNKNOWN (13): 当前节点的状态未知，可能是由于网络分区或其他问题。	1
term	当前选举周期	510
lastElectionReason	最近一次选举的原因	"electionTimeout"
members	副本集成员的详细信息	数组，包含各个节点的信息
health	节点的健康状态（1: 健康, 0: 不健康）	1
stateStr	节点的状态描述（如 PRIMARY, SECONDARY, ROLLBACK等）	"SECONDARY"
uptime	节点的运行时间（秒）	987
optime	最近一次操作的时间戳	Timestamp(1726197065, 1)
optimeDurable	最近一次持久化操作的时间戳	Timestamp(1726197065, 1)
optimeDate	最近一次操作的日期	ISODate("2024-09-13T03:11:05Z")
optimeDurableDate	最近一次持久化操作的日期	ISODate("2024-09-13T03:11:05Z")
lastHeartbeat	最近一次心跳信号的时间	ISODate("2024-09-14T06:44:34.930Z")
lastHeartbeatRecv	最近一次接收到心跳信号的时间	ISODate("1970-01-01T00:00:00Z")
pingMs	节点的延迟（毫秒）	NumberLong(1)
lastHeartbeatMessage	最近一次心跳的消息	""
syncingTo	当前节点正在同步的目标节点	""
syncSourceHost	当前节点的同步源主机	""
syncSourceId	当前节点的同步源ID	-1
infoMessage	额外的信息消息	""
configVersion	配置版本号	1829326
$clusterTime	集群时间信息	包含 clusterTime 和 signature
operationTime	最近一次操作的时间	Timestamp(1726296270, 1)

使用场景

• 故障排查: 当副本集出现问题时，使用rs.status()可以快速定位故障节点。
• 性能监控: 定期检查副本集状态，以确保所有节点正常运行并及时发现性能瓶颈。
• 维护操作: 在进行维护或升级操作前，确认副本集的健康状况。
• 选举监控: 监控选举过程，确保主节点的选举和切换正常进行。