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/**
* This test tests that initial sync succeeds when the sync source's oplog rolls over before the
* destination node reaches the oplog apply phase. It adds a new secondary to a replicaset and then
* pauses the initial sync before it copies the databases but after it starts to fetch and buffer
* oplog entries. The primary then fills up its oplog until it rolls over. At that point
* initial sync is resumed and we assert that it succeeds and that all of the inserted documents
* are there.
*/
(function() {
"use strict";
load("jstests/libs/check_log.js");
var name = 'initial_sync_oplog_rollover';
var replSet = new ReplSetTest({
name: name,
// This test requires a third node (added later) to be syncing when the oplog rolls
// over. Rolling over the oplog requires a majority of nodes to have confirmed and
// persisted those writes. Set the syncdelay to one to speed up checkpointing.
nodeOptions: {syncdelay: 1},
nodes: [
{rsConfig: {priority: 1}},
{rsConfig: {priority: 0}},
],
});
var oplogSizeOnPrimary = 1; // size in MB
replSet.startSet({oplogSize: oplogSizeOnPrimary});
replSet.initiate();
var primary = replSet.getPrimary();
var coll = primary.getDB('test').foo;
assert.writeOK(coll.insert({a: 1}));
function getFirstOplogEntry(conn) {
return conn.getDB('local').oplog.rs.find().sort({$natural: 1}).limit(1)[0];
}
var firstOplogEntry = getFirstOplogEntry(primary);
// Add a secondary node but make it hang before copying databases.
var secondary = replSet.add();
secondary.setSlaveOk();
assert.commandWorked(secondary.getDB('admin').runCommand(
{configureFailPoint: 'initialSyncHangBeforeCopyingDatabases', mode: 'alwaysOn'}));
replSet.reInitiate();
checkLog.contains(secondary,
'initial sync - initialSyncHangBeforeCopyingDatabases fail point enabled');
// Keep inserting large documents until they roll over the oplog.
const largeStr = new Array(4 * 1024 * oplogSizeOnPrimary).join('aaaaaaaa');
var i = 0;
while (bsonWoCompare(getFirstOplogEntry(primary), firstOplogEntry) === 0) {
assert.writeOK(coll.insert({a: 2, x: i++, long_str: largeStr}));
sleep(100);
}
assert.commandWorked(secondary.getDB('admin').runCommand(
{configureFailPoint: 'initialSyncHangBeforeCopyingDatabases', mode: 'off'}));
replSet.awaitSecondaryNodes(200 * 1000);
assert.eq(
i, secondary.getDB('test').foo.count({a: 2}), 'collection successfully synced to secondary');
assert.eq(0,
secondary.getDB('local')['temp_oplog_buffer'].find().itcount(),
"Oplog buffer was not dropped after initial sync");
replSet.stopSet();
})();
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