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The isMaster command returns a document describing the mongod instance. When the mongod is configsvr which is part of a replica set (CSRS) the output looks like:
{
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"hosts" : [
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"Jonathans-MacBook-Pro.local:29017",
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"Jonathans-MacBook-Pro.local:29018",
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"Jonathans-MacBook-Pro.local:29019"
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],
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"setName" : "configServers",
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"setVersion" : 1,
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"ismaster" : false,
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"secondary" : true,
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"me" : "Jonathans-MacBook-Pro.local:29017",
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"configsvr" : 1,
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"maxBsonObjectSize" : 16777216,
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"maxMessageSizeBytes" : 48000000,
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"maxWriteBatchSize" : 1000,
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"localTime" : ISODate("2015-08-13T17:05:16.605Z"),
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"maxWireVersion" : 4,
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"minWireVersion" : 0,
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"ok" : 1
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}
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The property configvr is a numeric. What does this value represent? When specifying the command replSetGetStatus for the replica set, the property configsvr is a boolean:
{
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"set" : "configServers",
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"date" : ISODate("2015-08-13T17:01:20.208Z"),
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"myState" : 1,
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"term" : NumberLong(0),
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"configsvr" : true,
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"heartbeatIntervalMillis" : NumberLong(2000),
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...
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