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/**
* SERVER-46365 In MongoDB v4.0, getMore commands check the featureCompatibilityVersion, but the
* featureCompatibiltyVersion does not get initialized in a replica set member until the replica set
* is initialized. The getMore command must not crash when it sees an uninitialized
* featureCompatibilityVersion, because it is possible to send a getMore to an uninitialized replica
* set member: for example, by reading the "local" database.
*/
(function() {
"use strict";
const rs = new ReplSetTest({name: "getMoreBeforeInitiateTest", nodes: 1});
rs.startSet();
// Before replica set initialization finishes, members reject getMore commands for any database
// other than the "local" database.
const db = rs.nodes[0].getDB("local");
const collName = "non_existent_collection";
// We use batch size 0 to ensure we get a cursor, even though there is no data in the
// collection.
const aggregateRes = assert.commandWorked(
db.runCommand({aggregate: collName, pipeline: [], cursor: {batchSize: 0}}));
assert(aggregateRes.hasOwnProperty("cursor"), aggregateRes);
// This getMore command will check the featureCompatibiltyVersion.
const getMoreRes = assert.commandWorked(
db.runCommand({getMore: aggregateRes.cursor.id, collection: collName}));
// This test is primarily testing that we don't crash, but we may as well also include a sanity
// check that we get back a correct (empty) result and exhausted cursor.
assert(getMoreRes.hasOwnProperty("cursor"), getMoreRes);
assert.eq(getMoreRes.cursor.id, 0, getMoreRes);
assert.eq(getMoreRes.cursor.nextBatch, [], getMoreRes);
rs.stopSet();
}());
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