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/**
* Tests that single voting primaries can commit majority writes when they storage-commit out of
* order. This test first inserts a document to set the last applied optime, all_durable
* timestamp, and stable timestamp. It then spawns 'n' threads and holds them behind a barrier. Once
* the threads are all waiting at the barrier, the threads all do a w:majority insert. We turn on a
* fail point that will block the first thread to receive an optime from the optime generator for a
* few seconds while the other threads get later optimes and commit their inserts. The hung thread
* is released after a few seconds and asserts that its write concern can be satisfied.
*/
(function() {
'use strict';
load('jstests/libs/parallelTester.js');
const rst = new ReplSetTest({nodes: 1});
rst.startSet();
rst.initiate();
const dbName = 'storage_commit_out_of_order';
const collName = 'foo';
const numThreads = 2;
const primary = rst.getPrimary();
const coll = primary.getDB(dbName).getCollection(collName);
/**
* Waits for the provided latch to reach 0 and then does a single w:majority insert.
*/
const majorityInsert = function(num, host, dbName, collName, latch) {
const m = new Mongo(host);
latch.countDown();
while (latch.getCount() > 0) {
// do nothing
}
return m.getDB(dbName).runCommand({
insert: collName,
documents: [{b: num}],
writeConcern: {w: 'majority', wtimeout: ReplSetTest.kDefaultTimeoutMS}
});
};
assert.commandWorked(primary.setLogLevel(2, 'replication'));
assert.commandWorked(
coll.insert({a: 1}, {writeConcern: {w: 'majority', wtimeout: ReplSetTest.kDefaultTimeoutMS}}));
// Turn on a fail point to force the first thread to receive an optime from the optime
// generator to wait a few seconds before storage-committing the insert.
assert.commandWorked(primary.adminCommand({
configureFailPoint: 'sleepBetweenInsertOpTimeGenerationAndLogOp',
mode: {times: 1},
data: {waitForMillis: 3000}
}));
// Start a bunch of threads. They will block waiting on the latch to hit 0.
const t = [];
const counter = new CountDownLatch(numThreads + 1);
for (let i = 0; i < numThreads; ++i) {
t[i] = new Thread(majorityInsert, i, coll.getMongo().host, dbName, collName, counter);
t[i].start();
}
// Release the threads with the latch once they are all blocked on it.
jsTestLog('All threads started.');
assert.soon(() => counter.getCount() === 1);
jsTestLog('All threads at barrier.');
counter.countDown();
jsTestLog('All threads finishing.');
// Wait for all threads to complete and ensure they succeeded.
for (let i = 0; i < numThreads; ++i) {
t[i].join();
assert.commandWorked(t[i].returnData());
}
rst.stopSet();
}());
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