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// Test mapReduce use with different values of the allowDiskUseByDefault parameter.
(function() {
"use strict";
const conn = MongoRunner.runMongod();
assert.neq(null, conn, "mongod was unable to start up");
const db = conn.getDB("test");
const coll = db.getCollection(jsTestName());
coll.drop();
const memoryLimitMb = 1;
const largeStr = "A".repeat(1024 * 1024); // 1MB string
// Create a collection exceeding the memory limit.
for (let i = 0; i < memoryLimitMb + 1; ++i)
assert.commandWorked(coll.insert({largeStr: largeStr}));
const mapReduceCmd = {
mapReduce: coll.getName(),
map: function() {
emit("a", this.largeStr);
},
reduce: function(k, v) {
return 42;
},
out: {inline: 1}
};
assert.commandWorked(db.adminCommand(
{setParameter: 1, internalDocumentSourceGroupMaxMemoryBytes: memoryLimitMb * 1024 * 1024}));
assert.commandWorked(db.adminCommand({setParameter: 1, allowDiskUseByDefault: false}));
assert.commandFailedWithCode(db.runCommand(mapReduceCmd),
ErrorCodes.QueryExceededMemoryLimitNoDiskUseAllowed);
assert.commandWorked(db.adminCommand({setParameter: 1, allowDiskUseByDefault: true}));
const res = assert.commandWorked(db.runCommand(mapReduceCmd));
assert.eq(res.results[0], {_id: "a", value: 42}, res);
MongoRunner.stopMongod(conn);
})();
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