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/**
* Fills WiredTiger cache during steady state oplog application.
* @tags: [requires_replication, requires_wiredtiger]
*/
(function() {
'use strict';
const rst = new ReplSetTest({
nodes: [
{
slowms: 30000, // Don't log slow operations on primary.
},
{
// Disallow elections on secondary.
rsConfig: {
priority: 0,
votes: 0,
},
},
],
nodeOptions: {
// Constrain the storage engine cache size to make it easier to fill it up with
// unflushed modifications.
wiredTigerCacheSizeGB: 1,
},
});
const nodes = rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const mydb = primary.getDB('test');
const coll = mydb.getCollection('t');
const numDocs = 2;
const minDocSizeMB = 10;
for (let i = 0; i < numDocs; ++i) {
assert.writeOK(
coll.save({_id: i, i: 0, x: 'x'.repeat(minDocSizeMB * 1024 * 1024)},
{writeConcern: {w: nodes.length, wtimeout: ReplSetTest.kDefaultTimeoutMS}}));
}
assert.eq(numDocs, coll.find().itcount());
const numUpdates = 500;
const secondary = rst.getSecondary();
const batchOpsLimit =
assert.commandWorked(secondary.adminCommand({getParameter: 1, replBatchLimitOperations: 1}))
.replBatchLimitOperations;
jsTestLog('Oplog application on secondary ' + secondary.host + ' is limited to ' + batchOpsLimit +
' operations per batch.');
jsTestLog('Buffering ' + numUpdates + ' updates to ' + numDocs + ' documents on secondary.');
const session = primary.startSession();
const sessionDB = session.getDatabase(mydb.getName());
const sessionColl = sessionDB.getCollection(coll.getName());
session.startTransaction();
for (let i = 0; i < numDocs; ++i) {
for (let j = 0; j < numUpdates; ++j) {
assert.writeOK(sessionColl.update({_id: i}, {$inc: {i: 1}}));
}
}
assert.commandWorked(session.commitTransaction_forTesting());
session.endSession();
jsTestLog('Applying updates on secondary ' + secondary.host);
// If the secondary is unable to apply all the operations in the unprepared transaction within
// a single batch with the constrained cache settings, the replica set will not reach a stable
// state.
rst.awaitReplication();
rst.stopSet();
})();
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