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// Test background index creation w/ constraints
// @tags: [SERVER-40561]
(function() {
"use strict";
const conn = MongoRunner.runMongod();
assert.neq(null, conn, "mongod failed to start.");
let db = conn.getDB("test");
let baseName = "jstests_index12";
let parallel = function() {
return db[baseName + "_parallelStatus"];
};
let resetParallel = function() {
parallel().drop();
};
// Return the PID to call `waitpid` on for clean shutdown.
let doParallel = function(work) {
resetParallel();
return startMongoProgramNoConnect(
"mongo",
"--eval",
work + "; db." + baseName + "_parallelStatus.save( {done:1} );",
db.getMongo().host);
};
let indexBuild = function() {
let fullName = "db." + baseName;
return doParallel(fullName + ".createIndex( {i:1}, {background:true, unique:true} )");
};
let doneParallel = function() {
return !!parallel().findOne();
};
let waitParallel = function() {
assert.soon(function() {
return doneParallel();
}, "parallel did not finish in time", 300000, 1000);
};
let turnFailPointOn = function(failPointName, i) {
assert.commandWorked(conn.adminCommand(
{configureFailPoint: failPointName, mode: "alwaysOn", data: {fieldsToMatch: {i: i}}}));
};
let turnFailPointOff = function(failPointName) {
assert.commandWorked(conn.adminCommand({configureFailPoint: failPointName, mode: "off"}));
};
// Unique background index build fails when there exists duplicate indexed values
// for the duration of the build.
let failOnExistingDuplicateValue = function(coll) {
let duplicateKey = 0;
assert.commandWorked(coll.save({i: duplicateKey}));
let bgIndexBuildPid = indexBuild();
waitProgram(bgIndexBuildPid);
assert.eq(1, coll.getIndexes().length, "Index should fail. There exist duplicate values.");
// Revert to unique key set
coll.deleteOne({i: duplicateKey});
};
// Unique background index build fails when started with a unique key set,
// but a document with a duplicate key is inserted prior to that key being indexed.
let failOnInsertedDuplicateValue = function(coll) {
let duplicateKey = 7;
turnFailPointOn("hangIndexBuildDuringCollectionScanPhaseBeforeInsertion", duplicateKey);
let bgIndexBuildPid;
try {
bgIndexBuildPid = indexBuild();
jsTestLog("Waiting to hang index build during collection scan before insertion of {i: " +
duplicateKey + "}");
checkLog.containsJson(conn, 20386, {
where: "before",
doc: function(doc) {
return doc.i === duplicateKey;
}
});
assert.commandWorked(coll.save({i: duplicateKey}));
} finally {
turnFailPointOff("hangIndexBuildDuringCollectionScanPhaseBeforeInsertion");
}
waitProgram(bgIndexBuildPid);
assert.eq(1,
coll.getIndexes().length,
"Index should fail. Duplicate key is inserted prior to that key being indexed.");
// Revert to unique key set
coll.deleteOne({i: duplicateKey});
};
// Unique background index build succeeds:
// 1) when a document is inserted and removed with a key that has already been indexed
// 2) when a document with a key not present in the initial set is inserted and removed
let succeedWithoutWriteErrors = function(coll, newKey) {
let duplicateKey = 3;
turnFailPointOn("hangIndexBuildDuringCollectionScanPhaseAfterInsertion", duplicateKey);
let bgIndexBuildPid;
try {
bgIndexBuildPid = indexBuild();
jsTestLog("Waiting to hang index build during collection scan after insertion of {i: " +
duplicateKey + "}");
checkLog.containsJson(conn, 20386, {
where: "after",
doc: function(doc) {
return doc.i === duplicateKey;
}
});
assert.commandWorked(coll.insert({i: duplicateKey, n: true}));
// First insert on key not present in initial set.
assert.commandWorked(coll.insert({i: newKey, n: true}));
// Remove duplicates before completing the index build.
assert.commandWorked(coll.deleteOne({i: duplicateKey, n: true}));
assert.commandWorked(coll.deleteOne({i: newKey, n: true}));
} finally {
turnFailPointOff("hangIndexBuildDuringCollectionScanPhaseAfterInsertion");
}
waitProgram(bgIndexBuildPid);
assert.eq(2, coll.getIndexes().length, "Index build should succeed");
};
let doTest = function() {
"use strict";
const size = 10;
let coll = db[baseName];
coll.drop();
for (let i = 0; i < size; ++i) {
assert.commandWorked(coll.save({i: i}));
}
assert.eq(size, coll.count());
assert.eq(1, coll.getIndexes().length, "_id index should already exist");
failOnExistingDuplicateValue(coll);
assert.eq(size, coll.count());
failOnInsertedDuplicateValue(coll);
assert.eq(size, coll.count());
succeedWithoutWriteErrors(coll, size);
waitParallel();
};
doTest();
MongoRunner.stopMongod(conn);
})();
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