有三个成员（主要，次要，次要）的副本。 假设其中一个辅助设备倒了一天，在返回辅助设备后返回复制品我怎么能找到，它是否同步？
我在测试环境中这样做了，但找不到rs.status()和db.printReplicationInfo()的有用数据。
db.printReplicationInfo()中有“日志长度开始结束”。但是默认情况下这是很重要的时间，并且在次要故障时会增长。
答案 0 :(得分：29)
注意：请务必查看the answer提供的arcseldon，了解用户友好的等效内容。
您可以使用rs.status()的输出。如果已同步辅助并且未使用slaveDelay选项创建辅助，则辅助的optime和optimeDate应该等于或关闭（如果有当前操作）到主要辅助。在这种情况下，stateStr应该等于SECONDARY。因此，如果辅助被同步，您应该看到类似于此的输出（为清楚起见，已从输出中删除了一个成员）：
{
"set" : "rs0",
"date" : ISODate("2013-11-08T14:58:49Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "hostname:27001",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 155,
"optime" : Timestamp(1383915748, 1),
"optimeDate" : ISODate("2013-11-08T13:02:28Z"),
"self" : true
},
{
"_id" : 2,
"name" : "hostname:27003",
"health" : 0,
"state" : 8,
"stateStr" : "SECONDARY",
"uptime" : 0,
"optime" : Timestamp(1383915748, 1),
"optimeDate" : ISODate("2013-11-08T13:02:28Z"),
"lastHeartbeat" : ISODate("2013-11-08T14:58:48Z"),
"lastHeartbeatRecv" : ISODate("2013-11-08T14:58:42Z"),
"pingMs" : 0,
"syncingTo" : "hostname:27001"
}
],
"ok" : 1
}
如果未同步其中一个辅助副本，则在此处为同一副本集输出rs.status()。首先，您会看到optime的{{1}}和optimeDate与主要版本不同，stateStr设置为hostname:27003，并且有RECOVERING。
lastHeartbeatMessage如果使用{
"set" : "rs0",
"date" : ISODate("2013-11-08T15:01:34Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "hostname:27001",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 320,
"optime" : Timestamp(1383922858, 767),
"optimeDate" : ISODate("2013-11-08T15:00:58Z"),
"self" : true
},
{
"_id" : 2,
"name" : "hostname:27003",
"health" : 1,
"state" : 3,
"stateStr" : "RECOVERING",
"uptime" : 14,
"optime" : Timestamp(1383915748, 1),
"optimeDate" : ISODate("2013-11-08T13:02:28Z"),
"lastHeartbeat" : ISODate("2013-11-08T15:01:34Z"),
"lastHeartbeatRecv" : ISODate("2013-11-08T15:01:34Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "still syncing, not yet to minValid optime 527cfc90:19c4",
"syncingTo" : "hostname:27001"
}
],
"ok" : 1
}
创建了辅助，则slaveDelay和optime可能会有所不同，但optimeDate和stateStr会指示是否存在滞后。< / p>
答案 1 :(得分：19)
2017年2月13日更新
同意rs.status()提供充分信息并且易于记忆的接受答案。但是，（个人现在使用Mongo 3 ），也非常喜欢rs.printSlaveReplicationInfo()的便利性和可读性。
它提供的输出类似于：
rs.printSlaveReplicationInfo()
source: node-2:27017
syncedTo: Mon Feb 13 2017 06:15:17 GMT-0500 (EST)
0 secs (0 hrs) behind the primary
source: node-3:27017
syncedTo: Mon Feb 13 2017 06:15:16 GMT-0500 (EST)
1 secs (0 hrs) behind the primary
如您所见，很容易了解副本集中节点之间的同步是否健康。
答案 2 :(得分：1)
我为mongoDB shell编写了一个小脚本。它显示了optime和optimeDate之间的差异。您可以使用它而不是比较手动副本集成员。
var isMaster = rs.isMaster();
var me = isMaster.me;
if(!isMaster.ismaster && isMaster.secondary)
{
var status = rs.status();
var master = isMaster.primary;
var masterOptime = 0;
var masterOptimeDate = 0;
var myOptime = 0;
var myOptimeDate = 0;
for(var i = 0 ; i < status.members.length ; i++)
{
var member = status.members[i];
if(member.name == me)
{
if(member.stateStr == "SECONDARY") {
myOptime = member.optime.getTime();
myOptimeDate = member.optimeDate.getTime();
}
else
{
print(me + ' is out of sync ' + member.stateStr);
break;
}
}
else if(member.name == master)
{
masterOptime = member.optime.getTime();
masterOptimeDate = member.optimeDate.getTime();
}
}
if(myOptime && myOptimeDate)
{
var optimeDiff = masterOptime - myOptime;
var optimeDateDiff = masterOptimeDate - myOptimeDate;
print('optime diff: ' + optimeDiff);
print('optimeDate diff: ' + optimeDateDiff);
}
}
else
{
print(me + ' is not secondary');
}
答案 3 :(得分：0)
@arcseldon提供了正确的答案，但是rs.printSlaveReplicationInfo（）将很快被描述
rs0：PRIMARY> rs.printSlaveReplicationInfo（） 警告：printSlaveReplicationInfo已被弃用，并可能在下一个主要版本中删除。请改用printSecondaryReplicationInfo。
因此，请改用 rs.printSecondaryReplicationInfo（）
rs0:PRIMARY> rs.printSecondaryReplicationInfo()
source: mongo-1.mongo.ns.svc.cluster.local:27017
syncedTo: Sat Sep 26 2020 01:26:32 GMT+0000 (UTC)
10 secs (0 hrs) behind the primary
source: mongo-2.mongo.ns.svc.cluster.local:27017
syncedTo: Sat Sep 26 2020 01:26:32 GMT+0000 (UTC)
10 secs (0 hrs) behind the primary
答案 4 :(得分：0)
更新命令 rs.printSecondaryReplicationInfo()：当您的 SECONDARY 处于初始同步状态，即 STARTUP2 时，输出将如下所示：
shard_03:PRIMARY> db.printSecondaryReplicationInfo()
source: mongo-1.mongo.ns.svc.cluster.local:27017
syncedTo: Thu Jan 01 1970 01:00:00 GMT+0100 (CET)
1623062383 secs (450850.66 hrs) behind the primary
当初始同步可能完成时，它没有给出任何指示。为了得到这个，连接到 SECONDARY 而不是 PRIMARY：
shard_03:STARTUP2> db.printSecondaryReplicationInfo()
source: mongo-2.mongo.ns.svc.cluster.local:27017
InitialSyncSyncSource: mongo-1.mongo.ns.svc.cluster.local:27017
InitialSyncRemainingEstimatedDuration: 1 hour(s) 11 minute(s)
哪个更有用。
从本地日志文件中您还可以看到进度，请参见此示例：
$ tail -f /var/log/mongodb/mongod.log | grep Repl
{"t":{"$date":"2021-06-07T12:44:57.310+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplWriterWorker-15","msg":"progress meter","attr":{"name":"data.sessions.20210603 collection clone progress","done":2541288,"total":14003530,"percent":18,"units":"documents copied"}}
{"t":{"$date":"2021-06-07T12:46:02.478+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplWriterWorker-15","msg":"progress meter","attr":{"name":"data.sessions.20210603 collection clone progress","done":5703094,"total":14003530,"percent":40,"units":"documents copied"}}
{"t":{"$date":"2021-06-07T12:47:11.357+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplWriterWorker-15","msg":"progress meter","attr":{"name":"data.sessions.20210603 collection clone progress","done":9131425,"total":14003530,"percent":65,"units":"documents copied"}}
{"t":{"$date":"2021-06-07T12:48:13.295+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplWriterWorker-15","msg":"progress meter","attr":{"name":"data.sessions.20210603 collection clone progress","done":11761778,"total":14003530,"percent":83,"units":"documents copied"}}
{"t":{"$date":"2021-06-07T12:49:01.000+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplCoordExtern-0","msg":"progress meter","attr":{"name":"Index Build: inserting keys from external sorter into index","done":4847100,"total":14003530,"percent":34}}
{"t":{"$date":"2021-06-07T12:49:04.001+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplCoordExtern-0","msg":"progress meter","attr":{"name":"Index Build: inserting keys from external sorter into index","done":10169600,"total":14003530,"percent":72}}
{"t":{"$date":"2021-06-07T12:49:05.952+02:00"},"s":"I", "c":"INDEX", "id":20685, "ctx":"ReplCoordExtern-0","msg":"Index build: inserted keys from external sorter into index","attr":{"namespace":"data.sessions.20210603","index":"tsi_1_t0_1_t_1","keysInserted":14003530,"durationMillis":8000}}
{"t":{"$date":"2021-06-07T12:49:09.000+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplCoordExtern-0","msg":"progress meter","attr":{"name":"Index Build: inserting keys from external sorter into index","done":6208700,"total":14003530,"percent":44}}
{"t":{"$date":"2021-06-07T12:49:11.977+02:00"},"s":"I", "c":"INDEX", "id":20685, "ctx":"ReplCoordExtern-0","msg":"Index build: inserted keys from external sorter into index","attr":{"namespace":"data.sessions.20210603","index":"si_1","keysInserted":14003530,"durationMillis":5000}}
{"t":{"$date":"2021-06-07T12:49:15.001+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplCoordExtern-0","msg":"progress meter","attr":{"name":"Index Build: inserting keys from external sorter into index","done":4498400,"total":14003530,"percent":32}}
{"t":{"$date":"2021-06-07T12:49:18.001+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplCoordExtern-0","msg":"progress meter","attr":{"name":"Index Build: inserting keys from external sorter into index","done":11187800,"total":14003530,"percent":79}}
{"t":{"$date":"2021-06-07T12:49:19.557+02:00"},"s":"I", "c":"INDEX", "id":20685, "ctx":"ReplCoordExtern-0","msg":"Index build: inserted keys from external sorter into index","attr":{"namespace":"data.sessions.20210603","index":"tsi_1_si_1","keysInserted":14003530,"durationMillis":7000}}
{"t":{"$date":"2021-06-07T12:49:19.697+02:00"},"s":"I", "c":"INDEX", "id":20345, "ctx":"ReplCoordExtern-0","msg":"Index build: done building","attr":{"buildUUID":null,"namespace":"data.sessions.20210603","index":"tsi_1_t0_1_t_1","commitTimestamp":{"$timestamp":{"t":1623062959,"i":22000}}}}
{"t":{"$date":"2021-06-07T12:49:19.698+02:00"},"s":"I", "c":"INDEX", "id":20345, "ctx":"ReplCoordExtern-0","msg":"Index build: done building","attr":{"buildUUID":null,"namespace":"data.sessions.20210603","index":"si_1","commitTimestamp":{"$timestamp":{"t":1623062959,"i":22000}}}}
{"t":{"$date":"2021-06-07T12:49:19.699+02:00"},"s":"I", "c":"INDEX", "id":20345, "ctx":"ReplCoordExtern-0","msg":"Index build: done building","attr":{"buildUUID":null,"namespace":"data.sessions.20210603","index":"tsi_1_si_1","commitTimestamp":{"$timestamp":{"t":1623062959,"i":22000}}}}
{"t":{"$date":"2021-06-07T12:49:26.001+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplCoordExtern-0","msg":"progress meter","attr":{"name":"Index Build: inserting keys from external sorter into index","done":5717400,"total":14003530,"percent":40}}
{"t":{"$date":"2021-06-07T12:49:29.000+02:00"},"s":"I", "c":"-", "id":51773, "ctx":"ReplCoordExtern-0","msg":"progress meter","attr":{"name":"Index Build: inserting keys from external sorter into index","done":12567700,"total":14003530,"percent":89}}
{"t":{"$date":"2021-06-07T12:49:29.618+02:00"},"s":"I", "c":"INDEX", "id":20685, "ctx":"ReplCoordExtern-0","msg":"Index build: inserted keys from external sorter into index","attr":{"namespace":"data.sessions.20210603","index":"_id_","keysInserted":14003530,"durationMillis":9000}}
{"t":{"$date":"2021-06-07T12:49:29.833+02:00"},"s":"I", "c":"INDEX", "id":20345, "ctx":"ReplCoordExtern-0","msg":"Index build: done building","attr":{"buildUUID":null,"namespace":"data.sessions.20210603","index":"_id_","commitTimestamp":{"$timestamp":{"t":1623062969,"i":7002}}}}
{"t":{"$date":"2021-06-07T12:49:29.839+02:00"},"s":"I", "c":"STORAGE", "id":20320, "ctx":"ReplCoordExtern-0","msg":"createCollection","attr":{"namespace":"data.sessions.20210601","uuidDisposition":"provided","uuid":{"uuid":{"$uuid":"bddc70be-463a-472a-a1e9-bdc5162a13f0"}},"options":{"uuid":{"$uuid":"bddc70be-463a-472a-a1e9-bdc5162a13f0"}}}}
{"t":{"$date":"2021-06-07T12:49:29.846+02:00"},"s":"I", "c":"INDEX", "id":20384, "ctx":"ReplCoordExtern-0","msg":"Index build: starting","attr":{"namespace":"data.sessions.20210601","buildUUID":null,"properties":{"v":2,"key":{"tsi":1.0,"t0":1.0,"t":1.0},"name":"tsi_1_t0_1_t_1"},"method":"Hybrid","maxTemporaryMemoryUsageMB":66}}
{"t":{"$date":"2021-06-07T12:49:29.849+02:00"},"s":"I", "c":"INDEX", "id":20384, "ctx":"ReplCoordExtern-0","msg":"Index build: starting","attr":{"namespace":"data.sessions.20210601","buildUUID":null,"properties":{"v":2,"key":{"si":1.0},"name":"si_1"},"method":"Hybrid","maxTemporaryMemoryUsageMB":66}}
{"t":{"$date":"2021-06-07T12:49:29.853+02:00"},"s":"I", "c":"INDEX", "id":20384, "ctx":"ReplCoordExtern-0","msg":"Index build: starting","attr":{"namespace":"data.sessions.20210601","buildUUID":null,"properties":{"v":2,"key":{"tsi":1.0,"si":1.0},"name":"tsi_1_si_1"},"method":"Hybrid","maxTemporaryMemoryUsageMB":66}}
{"t":{"$date":"2021-06-07T12:49:29.859+02:00"},"s":"I", "c":"INDEX", "id":20384, "ctx":"ReplCoordExtern-0","msg":"Index build: starting","attr":{"namespace":"data.sessions.20210601","buildUUID":null,"properties":{"v":2,"key":{"_id":1},"name":"_id_"},"method":"Hybrid","maxTemporaryMemoryUsageMB":200}}