mongodb/jstests/replsets/initial_sync_drop_collection.js

/**
 * Test that CollectionCloner completes without error when a collection is dropped during cloning.
 * @tags: [requires_fcv_44]
 */

(function() {
"use strict";

load("jstests/libs/fail_point_util.js");
load('jstests/replsets/libs/two_phase_drops.js');
load("jstests/libs/uuid_util.js");
load("jstests/libs/logv2_helpers.js");

// Set up replica set. Disallow chaining so nodes always sync from primary.
const testName = "initial_sync_drop_collection";
const dbName = testName;
var replTest = new ReplSetTest(
    {name: testName, nodes: [{}, {rsConfig: {priority: 0}}], settings: {chainingAllowed: false}});
replTest.startSet();
replTest.initiate();

var primary = replTest.getPrimary();
var primaryDB = primary.getDB(dbName);
var secondary = replTest.getSecondary();
var secondaryDB = secondary.getDB(dbName);
const collName = "testcoll";
var primaryColl = primaryDB[collName];
var secondaryColl = secondaryDB[collName];
var nss = primaryColl.getFullName();

// This function adds data to the collection, restarts the secondary node with the given
// parameters and setting the given failpoint, waits for the failpoint to be hit,
// drops the collection, then disables the failpoint.  It then optionally waits for the
// expectedLog message and waits for the secondary to complete initial sync, then ensures
// the collection on the secondary is empty.
function setupTest({failPoint, extraFailPointData, secondaryStartupParams}) {
    jsTestLog("Writing data to collection.");
    assert.commandWorked(primaryColl.insert([{_id: 1}, {_id: 2}]));
    const data = Object.merge(extraFailPointData || {}, {nss: nss});

    jsTestLog("Restarting secondary with failPoint " + failPoint + " set for " + nss);
    secondaryStartupParams = secondaryStartupParams || {};
    secondaryStartupParams['failpoint.' + failPoint] = tojson({mode: 'alwaysOn', data: data});
    // Skip clearing initial sync progress after a successful initial sync attempt so that we
    // can check initialSyncStatus fields after initial sync is complete.
    secondaryStartupParams['failpoint.skipClearInitialSyncState'] = tojson({mode: 'alwaysOn'});
    secondaryStartupParams['numInitialSyncAttempts'] = 1;
    secondary =
        replTest.restart(secondary, {startClean: true, setParameter: secondaryStartupParams});
    secondaryDB = secondary.getDB(dbName);
    secondaryColl = secondaryDB[collName];

    jsTestLog("Waiting for secondary to reach failPoint " + failPoint);
    assert.commandWorked(secondary.adminCommand({
        waitForFailPoint: failPoint,
        timesEntered: 1,
        maxTimeMS: kDefaultWaitForFailPointTimeout
    }));

    // Restarting the secondary may have resulted in an election.  Wait until the system
    // stabilizes and reaches RS_STARTUP2 state.
    replTest.getPrimary();
    replTest.waitForState(secondary, ReplSetTest.State.STARTUP_2);
}

function finishTest({failPoint, expectedLog, waitForDrop, createNew}) {
    // Get the uuid for use in checking the log line.
    const uuid_obj = getUUIDFromListCollections(primaryDB, collName);
    const uuid = extractUUIDFromObject(uuid_obj);

    jsTestLog("Dropping collection on primary: " + primaryColl.getFullName());
    assert(primaryColl.drop());

    if (waitForDrop) {
        jsTestLog("Waiting for drop to commit on primary");
        TwoPhaseDropCollectionTest.waitForDropToComplete(primaryDB, collName);
    }

    // Only set for test cases that use 'system.drop' namespaces when dropping collections.
    // In those tests the variable 'rnss' represents such a namespace. Used for expectedLog.
    // See test cases 3 and 4 below.
    let rnss;
    const dropPendingColl =
        TwoPhaseDropCollectionTest.collectionIsPendingDropInDatabase(primaryDB, collName);
    if (dropPendingColl) {
        rnss = dbName + "." + dropPendingColl["name"];
    }

    if (createNew) {
        jsTestLog("Creating a new collection with the same name: " + primaryColl.getFullName());
        assert.commandWorked(primaryColl.insert({_id: "not the same collection"}));
    }

    jsTestLog("Allowing secondary to continue.");
    assert.commandWorked(secondary.adminCommand({configureFailPoint: failPoint, mode: 'off'}));

    if (expectedLog) {
        expectedLog = eval(expectedLog);
        jsTestLog(expectedLog);
        checkLog.contains(secondary, expectedLog);
    }

    jsTestLog("Waiting for initial sync to complete.");
    replTest.waitForState(secondary, ReplSetTest.State.SECONDARY);

    let res = assert.commandWorked(secondary.adminCommand({replSetGetStatus: 1}));
    assert.eq(0, res.initialSyncStatus.failedInitialSyncAttempts);

    if (createNew) {
        assert.eq([{_id: "not the same collection"}], secondaryColl.find().toArray());
        assert(primaryColl.drop());
    } else {
        assert.eq(0, secondaryColl.find().itcount());
    }
    replTest.checkReplicatedDataHashes();
}

function runDropTest(params) {
    setupTest(params);
    finishTest(params);
}

jsTestLog("[1] Testing dropping between listIndexes and find.");
runDropTest({
    failPoint: "hangBeforeClonerStage",
    extraFailPointData: {cloner: "CollectionCloner", stage: "query"}
});

jsTestLog(
    "[2] Testing dropping between listIndexes and find, with new same-name collection created.");
runDropTest({
    failPoint: "hangBeforeClonerStage",
    extraFailPointData: {cloner: "CollectionCloner", stage: "query"},
    createNew: true
});

let expectedLogFor3and4 =
    "`CollectionCloner ns: '${nss}' uuid: UUID(\"${uuid}\") stopped because collection was dropped on source.`";

if (isJsonLogNoConn()) {
    // Double escape the backslash as eval will do unescaping
    expectedLogFor3and4 =
        '`CollectionCloner stopped because collection was dropped on source","attr":{"namespace":"${nss}","uuid":{"uuid":{"$uuid":"${uuid}"}}}}`';
}

// We don't support 4.2 style two-phase drops with EMRC=false - in that configuration, the
// collection will instead be renamed to a <db>.system.drop.* namespace before being dropped. Since
// the cloner queries collection by UUID, it will observe the first drop phase as a rename.
// We still want to check that initial sync succeeds in such a case.
if (TwoPhaseDropCollectionTest.supportsDropPendingNamespaces(replTest)) {
    if (isJsonLogNoConn()) {
        expectedLogFor3and4 =
            '`Initial Sync retrying cloner stage due to error","attr":{"cloner":"CollectionCloner","stage":"query","error":{"code":175,"codeName":"QueryPlanKilled","errmsg":"collection renamed from \'${nss}\' to \'${rnss}\'. UUID ${uuid}`';
    } else {
        expectedLogFor3and4 =
            "`Initial Sync retrying CollectionCloner stage query due to QueryPlanKilled: collection renamed from '${nss}' to '${rnss}'. UUID ${uuid}`";
    }
}

jsTestLog("[3] Testing drop-pending between getMore calls.");
runDropTest({
    failPoint: "initialSyncHangCollectionClonerAfterHandlingBatchResponse",
    secondaryStartupParams: {collectionClonerBatchSize: 1},
    expectedLog: expectedLogFor3and4
});

jsTestLog("[4] Testing drop-pending with new same-name collection created, between getMore calls.");
runDropTest({
    failPoint: "initialSyncHangCollectionClonerAfterHandlingBatchResponse",
    secondaryStartupParams: {collectionClonerBatchSize: 1},
    expectedLog: expectedLogFor3and4,
    createNew: true
});

// Add another node to the set, so when we drop the collection it can commit.  This other
// secondary will be finished with initial sync when the drop happens.
var secondary2 = replTest.add({rsConfig: {priority: 0}});
replTest.reInitiate();
replTest.waitForState(secondary2, ReplSetTest.State.SECONDARY);

jsTestLog("[5] Testing committed drop between getMore calls.");
runDropTest({
    failPoint: "initialSyncHangCollectionClonerAfterHandlingBatchResponse",
    secondaryStartupParams: {collectionClonerBatchSize: 1},
    waitForDrop: true,
    // Double escape the backslash as eval will do unescaping
    expectedLog: isJsonLogNoConn()
        ? '`CollectionCloner stopped because collection was dropped on source","attr":{"namespace":"${nss}","uuid":{"uuid":{"$uuid":"${uuid}"}}}}`'
        : "`CollectionCloner ns: '${nss}' uuid: UUID(\"${uuid}\") stopped because collection was dropped on source.`"
});

jsTestLog(
    "[6] Testing committed drop with new same-name collection created, between getMore calls.");
runDropTest({
    failPoint: "initialSyncHangCollectionClonerAfterHandlingBatchResponse",
    secondaryStartupParams: {collectionClonerBatchSize: 1},
    waitForDrop: true,
    // Double escape the backslash as eval will do unescaping
    expectedLog: isJsonLogNoConn()
        ? '`CollectionCloner stopped because collection was dropped on source","attr":{"namespace":"${nss}","uuid":{"uuid":{"$uuid":"${uuid}"}}}}`'
        : "`CollectionCloner ns: '${nss}' uuid: UUID(\"${uuid}\") stopped because collection was dropped on source.`",
    createNew: true
});

replTest.stopSet();
})();