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In theory, we can create a ReplSetTest fixture from a seed node that is part of an existing replica set, like 'new ReplSetTest("host:123")'. The test queries the RS config and initiates its own data structures as if it had initiated the set itself. However, ReplSetTest.stop() fails:
checkDBHashesForReplSet going to check data hashes on secondary: jesse-workstation:20022
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uncaught exception: TypeError: replSetConfig.members[rst.getNodeId(...)] is undefined :
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checkDBHashesForReplSet/<@src/mongo/shell/replsettest.js:2510:47
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checkDBHashesForReplSet@src/mongo/shell/replsettest.js:2387:17
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ReplSetTest/this.checkReplicaSet@src/mongo/shell/replsettest.js:2303:13
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ReplSetTest/this.checkReplicatedDataHashes@src/mongo/shell/replsettest.js:2588:9
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RollbackTest/this._checkDataConsistencyImpl@jstests/replsets/libs/rollback_test.js:249:9
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RollbackTest/this.checkDataConsistency@jstests/replsets/libs/rollback_test.js:255:9
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The fixture doesn't initialize its "members" array when constructed with a seed node.
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