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/**
* Starts an index build, steps down the primary before the index build has completed its setup (and
* made other replicas aware of the index build), and drop the collection the index is being built
* on. This exercises a path described in SERVER-77025 whereby applying a DDL operation (like
* dropCollection) on the secondary conflicts with the ongoing index build. This test confirms that
* replication waits until the index build is not present anymore, and then retries dropCollection
* and succeeds.
*
* @tags: [
* requires_replication,
* ]
*/
(function() {
"use strict";
load("jstests/libs/fail_point_util.js"); // For "configureFailPoint()"
load("jstests/libs/parallelTester.js"); // For "startParallelShell()"
load("jstests/noPassthrough/libs/index_build.js"); // For "IndexBuildTest"
const rst = new ReplSetTest({nodes: 2});
rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const primaryDB = primary.getDB("test");
const primaryColl = primaryDB.getCollection("coll");
assert.commandWorked(primaryDB.setLogLevel(1, "replication"));
assert.commandWorked(primaryColl.insert({_id: 1, a: 1}));
rst.awaitReplication();
// Enable fail point which makes index build hang during setup, simulating a condition where the
// index build is registered, but not yet replicated.
const fp = configureFailPoint(primary, "hangIndexBuildOnSetupBeforeTakingLocks");
const waitForIndexBuildToErrorOut = IndexBuildTest.startIndexBuild(
primary, primaryColl.getFullName(), {a: 1}, {}, [ErrorCodes.InterruptedDueToReplStateChange]);
fp.wait();
// Step down the node, while the index build is set up in memory but the "startIndexBuild" entry
// hasn't replicated.
assert.commandWorked(primaryDB.adminCommand({"replSetStepDown": 5 * 60, "force": true}));
rst.waitForPrimary();
// Drop the collection on the new primary. The new primary is not aware of the index build, because
// the old primary hadn't been able to replicate the "startIndexBuild" oplog entry.
const waitForDropCollection = startParallelShell(function() {
db.getCollection("coll").drop();
}, rst.getPrimary().port);
// Confirm that the old primary, now secondary waits until the index build is not in progress any
// longer before retrying the drop.
// "Waiting for index build(s) to complete on the namespace before retrying the conflicting
// operation"
assert.soon(() => checkLog.checkContainsOnceJson(rst.getSecondary(), 7702500));
// Resume the index build so it can fail due to InterruptedDueToReplStateChange.
fp.off();
// Confirm that the old primary, now secondary can retry the dropCollection.
// "Acceptable error during oplog application: background operation in progress for namespace"
assert.soon(() => checkLog.checkContainsOnceJson(rst.getSecondary(), 51775));
// dropCollection now succeeds, and the command completes on the primary.
waitForDropCollection();
rst.awaitReplication();
// The index build fails with InterruptedDueToReplStateChange.
waitForIndexBuildToErrorOut();
// Collection doesn't exist.
assert(!rst.getPrimary().getDB("test").getCollectionNames().includes("coll"));
assert(!rst.getSecondary().getDB("test").getCollectionNames().includes("coll"));
rst.stopSet();
})();
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