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// This test ensures that the replWriterThreadCount server parameter:
// 1) cannot be less than 1
// 2) cannot be greater than 256
// 3) is actually set to the passed in value
// 4) cannot be altered at run time
(function() {
"use strict";
// too low a count
clearRawMongoProgramOutput();
assert.throws(() => MongoRunner.runMongod({setParameter: 'replWriterThreadCount=0'}));
assert(
rawMongoProgramOutput().match(
"Invalid value for parameter replWriterThreadCount: 0 is not greater than or equal to 1"),
"mongod started with too low a value for replWriterThreadCount");
// too high a count
clearRawMongoProgramOutput();
assert.throws(() => MongoRunner.runMongod({setParameter: 'replWriterThreadCount=257'}));
assert(
rawMongoProgramOutput().match(
"Invalid value for parameter replWriterThreadCount: 257 is not less than or equal to 256"),
"mongod started with too high a value for replWriterThreadCount");
// proper count
clearRawMongoProgramOutput();
let mongo = MongoRunner.runMongod({setParameter: 'replWriterThreadCount=24'});
assert.neq(null, mongo, "mongod failed to start with a suitable replWriterThreadCount value");
assert(!rawMongoProgramOutput().match("Invalid value for parameter replWriterThreadCount"),
"despite accepting the replWriterThreadCount value, mongod logged an error");
// getParameter to confirm the value was set
var result = mongo.getDB("admin").runCommand({getParameter: 1, replWriterThreadCount: 1});
assert.eq(24, result.replWriterThreadCount, "replWriterThreadCount was not set internally");
// setParameter to ensure it is not possible
assert.commandFailed(mongo.getDB("admin").runCommand({setParameter: 1, replWriterThreadCount: 1}));
MongoRunner.stopMongod(mongo);
}());
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