{{2017-11-14T12:18:54.686+0330 I COMMAND  [conn18] command local.oplog.rs command: getMore { getMore: 16697257165, collection: "oplog.rs", maxTimeMS: 5000, term: 21, lastKnownCommittedOpTime: { ts: Timestamp 1510649328000|1, t: 21 } } originatingCommand: { find: "oplog.rs", filter: { ts: { $gte: Timestamp 1510640408000|1 } }, tailable: true, oplogReplay: true, awaitData: true, maxTimeMS: 60000, term: 21 } planSummary: COLLSCAN cursorid:16697257165 keysExamined:0 docsExamined:0 numYields:1 nreturned:0 reslen:451 locks:{ Global: { acquireCount: { r: 6 } }, Database: { acquireCount: { r: 3 } }, oplog: { acquireCount: { r: 3 } } } protocol:op_command 5810ms}}

serverStatus slow error : 
{{2017-11-14T11:48:06.309+0330 I COMMAND  [ftdc] serverStatus was very slow: { after basic: 0, after asserts: 0, after backgroundFlushing: 0, after connections: 0, after dur: 0, after extra_info: 0, after globalLock: 0, after locks: 0, after network: 0, after opLatencies: 0, after opcounters: 0, after opcountersRepl: 0, after repl: 0, after security: 0, after storageEngine: 0, after tcmalloc: 0, after wiredTiger: 3572, at end: 3572 }}}

2017-11-13T13:41:28.649-0500 I REPL     [rsBackgroundSync] sync source candidate: 172.16.12.165:27017
2017-11-13T13:43:33.609-0500 I REPL     [ReplicationExecutor] Starting an election, since we've seen no PRIMARY in the past 10000ms
2017-11-13T13:43:33.609-0500 I REPL     [ReplicationExecutor] conducting a dry run election to see if we could be elected
2017-11-13T13:43:33.610-0500 I REPL     [ReplicationExecutor] VoteRequester(term 18 dry run) received a yes vote from 172.16.12.166:27017; response message: { term: 18, voteGranted: true, reason: "", ok: 1.0 }
2017-11-13T13:43:33.610-0500 I REPL     [ReplicationExecutor] dry election run succeeded, running for election
2017-11-13T13:43:33.614-0500 I REPL     [ReplicationExecutor] VoteRequester(term 19) received a yes vote from 172.16.12.166:27017; response message: { term: 18, voteGranted: true, reason: "", ok: 1.0 }
2017-11-13T13:43:33.614-0500 I REPL     [ReplicationExecutor] election succeeded, assuming primary role in term 19
2017-11-13T13:43:33.614-0500 I REPL     [ReplicationExecutor] transition to PRIMARY
2017-11-13T13:43:33.614-0500 I REPL     [ReplicationExecutor] Entering primary catch-up mode.
2017-11-13T13:43:33.614-0500 I REPL     [ReplicationExecutor] Member 172.16.12.166:27017 is now in state SECONDARY
2017-11-13T13:43:33.616-0500 I REPL     [ReplicationExecutor] Caught up to the latest optime known via heartbeats after becoming primary.
2017-11-13T13:43:33.616-0500 I REPL     [ReplicationExecutor] Exited primary catch-up mode.
2017-11-13T13:43:33.616-0500 I REPL     [rsBackgroundSync] Replication producer stopped after oplog fetcher finished returning a batch from our sync source.  Abandoning this batch of oplog entries and re-evaluating our sync source.
2017-11-13T13:43:33.970-0500 I REPL     [SyncSourceFeedback] SyncSourceFeedback error sending update to 172.16.12.165:27017: InvalidSyncSource: Sync source was cleared. Was 172.16.12.165:27017
2017-11-13T13:43:35.610-0500 I REPL     [rsSync] transition to primary complete; database writes are now permitted
2017-11-13T13:44:16.527-0500 I REPL     [conn234] stepping down from primary, because a new term has begun: 20
2017-11-13T13:44:16.527-0500 I REPL     [replExecDBWorker-2] transition to SECONDARY