MongoDB ReplicaSet问题

Question

我们在Kubernetes上运行MongoDB ReplicaSet。MongoDB在CrashLoop中的一个豆荚，它显示OOMKilled为真。从那以后这个吊舱就坠毁了234次。

我们有一所小学和两所中学。

这是最新的日志。容器停留在一分钟左右，然后再次崩溃。我在试着理解这些日志的含义。

OplogStartMissing是什么意思？

145 {"log":"2022-03-08T09:24:44.127+0000 I REPL     [rsBackgroundSync] Starting rollback due to     OplogStartMissing: Our last op time fetched: { ts: Timestamp(1646656464, 1), t: 58 }. source    's GTE: { ts: Timestamp(1646656801, 1), t: 60 } hashes: (2206456552855381608/810867260034420    2316)\n","stream":"stdout","time":"2022-03-08T09:24:44.12744806Z"}

147 {"log":"2022-03-08T09:24:44.127+0000 I REPL[rsBackgroundSync] Rollback using the 'rollbackViaRefetch' method because UUID support is feature compatible with featureCompatibilityVersion 3.6.\n","stream":"stdout","time":"2022-03-08T09:24:44.12747365Z"}
148 {"log":"2022-03-08T09:24:44.127+0000 I REPL[rsBackgroundSync] transition to ROLLBACK from SECONDARY\n","stream":"stdout","time":"2022-03-08T09:24:44.127477084Z"}
149 {"log":"2022-03-08T09:24:44.127+0000 I ROLLBACK [rsBackgroundSync] Starting rollback. Sync source: mongodb-2.mongodb.maglev-system.svc.cluster.local:27017\n","stream":"stdout","time":"    2022-03-08T09:24:44.127480067Z"}
150 {"log":"2022-03-08T09:24:44.133+0000 I ROLLBACK [rsBackgroundSync] Finding the Common Point\n","stream":"stdout","time":"2022-03-08T09:24:44.133319869Z"}
151 {"log":"2022-03-08T09:24:44.136+0000 I ROLLBACK [rsBackgroundSync] our last optime:   Timest    amp(1646656464, 1)\n","stream":"stdout","time":"2022-03-08T09:24:44.136901468Z"}
152 {"log":"2022-03-08T09:24:44.136+0000 I ROLLBACK [rsBackgroundSync] their last optime: Timestamp(1646731479, 1)\n","stream":"stdout","time":"2022-03-08T09:24:44.136912166Z"}
153 {"log":"2022-03-08T09:24:44.136+0000 I ROLLBACK [rsBackgroundSync] diff in end of log times: **-75015** seconds\n","stream":"stdout","time":"2022-03-08T09:24:44.136916265Z"}
154 {"log":"2022-03-08T09:24:44.320+0000 I NETWORK  [listener] connection accepted from 127.0.0.    1:41476 #2 (1 connection now open)\n","stream":"stdout","time":"2022-03-08T09:24:44.32070222    4Z"}

特别是日志时间结束时的差异是负的。负值意味着什么。RollBackViaRefetch是什么意思？

Answer 1

OOMKilled -意味着容器被杀死了，因为它试图使用比您在resources.limits部分分配给它的内存更多的内存。

OplogStartMissing --大多数情况下，似乎都认为OpLog太小了。试着增加它。

RollbackViaRefetch -来自文档

如果节点在收到来自同步源的第一批写入后进入回滚，那么它们就会意识到大于或等于谓词没有返回oplog中的最后一个op。回滚时，节点处于回滚状态，禁止读取。当一个节点进入回滚时，它会删除所有快照。回滚节点首先找到其oplog和同步源oplog之间的公共点。然后，它将其oplog中的所有操作返回到公共点，并找出如何撤消它们。