Initial syncing node can crash due to BSONObjectTooLarge exception thrown while replaying the oplog entries.

  (function() { "use strict";   load("jstests/libs/curop_helpers.js"); // for waitForCurOpByFailPoint(). load("jstests/libs/fail_point_util.js");   const testName = "testDB"; const dbName = testName; const collName = "testcoll";   // Start a 3 node replica set to avoid primary step down after secondary restart. const rst = new ReplSetTest( {nodes: [{}, {rsConfig: {priority: 0}}, {arbiter: true}], settings: {chainingAllowed: false}}); rst.startSet(); rst.initiate();   var primary = rst.getPrimary(); var primaryDB = primary.getDB(dbName); var primaryAdmin = primary.getDB("admin"); var primaryColl = primaryDB[collName]; var secondary = rst.getSecondary();   // Write a document of 6 MB. const largeArray = new Array(6 * 1024 * 1024).join('x'); assert.commandWorked(primaryColl.insert({_id: 1, a: largeArray}));   jsTestLog("Stopping secondary."); rst.stop(secondary);   jsTestLog("Enabling failpoint 'hangBeforeListDatabases' on primary (sync source)."); assert.commandWorked( primary.adminCommand({configureFailPoint: "hangBeforeListDatabases", mode: "alwaysOn"}));   jsTestLog("Starting secondary."); let secondaryStartupParams = {}; secondaryStartupParams['numInitialSyncAttempts'] = 1; secondary = rst.start(secondary, {startClean: true, setParameter: secondaryStartupParams}); rst.waitForState(secondary, ReplSetTest.State.STARTUP_2);   jsTestLog("Waiting for primary to reach failPoint 'hangBeforeListDatabases'"); waitForCurOpByFailPoint(primaryAdmin, new RegExp('^' + ""), "hangBeforeListDatabases");   // Now perform following updates on the document. So, both collection cloner and initial sync // oplog appplier would try to apply those updates and lead to BSONObjectTooLarge exception error. assert.commandWorked(primaryColl.update({_id: 1}, {$set: {b: largeArray}})); assert.commandWorked(primaryColl.update({_id: 1}, {$unset: {b: 1}})); assert.commandWorked(primaryColl.update({_id: 1}, {$set: {c: largeArray}}));   jsTestLog("Allowing initial sync to continue."); assert.commandWorked( primaryAdmin.adminCommand({configureFailPoint: 'hangBeforeListDatabases', mode: 'off'}));   jsTestLog("Waiting for initial sync to complete."); rst.waitForState(secondary, ReplSetTest.State.SECONDARY);   rst.stopSet(); })();