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// Verify that we can run various forms of the mapReduce command during different stages of the
// cluster upgrade process.
// Checking UUID consistency uses cached connections, which are not valid across restarts or
// stepdowns.
TestData.skipCheckingUUIDsConsistentAcrossCluster = true;
(function() {
"use strict";
load("jstests/multiVersion/libs/multi_cluster.js"); // For upgradeCluster.
const testName = "map_reduce_multiversion_cluster";
const dbName = "test_" + testName;
const collName = testName;
// Start a sharded cluster in which all mongod and mongos processes are "last-stable" binVersion.
var st = new ShardingTest({
shards: 2,
rs: {nodes: 2, binVersion: "last-stable"},
other: {mongosOptions: {binVersion: "last-stable"}}
});
let mongosConn = st.s;
assert.commandWorked(mongosConn.getDB(dbName).runCommand({create: collName}));
st.ensurePrimaryShard(dbName, st.shard0.shardName);
// Shard the test collection and split it into two chunks.
st.shardColl(collName,
{state: 1} /* Shard key */,
{state: "MA"} /* Split at */,
{state: "MA"} /* Move the chunk containing {state: MA} to its own shard */,
dbName,
true /* Wait until documents orphaned by the move get deleted */);
// Seed the source collection with example user documents.
let sourceColl = mongosConn.getDB(dbName)[collName];
const nDocs = 100;
const states = ["AL", "MA", "NY"];
Random.setRandomSeed();
const bulk = sourceColl.initializeUnorderedBulkOp();
for (let i = 0; i < nDocs; i++) {
const randomState = states[Math.floor(Math.random() * states.length)];
bulk.insert({state: randomState, age: Random.randInt(100)});
}
assert.commandWorked(bulk.execute());
// Runs a set of MapReduce commands which are expected to be supported regardless of the FCV and
// binary version of the nodes in the cluster.
function runValidMrTests(coll) {
// Map/reduce/finalize functions to compute the average age per state.
function map() {
emit(this.state, {count: 1, avgAge: 0, total: this.age});
}
function reduce(key, values) {
let reducedObject = {total: 0, count: 0, avgAge: 0};
values.forEach(function(value) {
reducedObject.total += value.total;
reducedObject.count += value.count;
});
return reducedObject;
}
function fin(key, reducedValue) {
if (reducedValue.count > 0) {
reducedValue.avgAge = reducedValue.total / reducedValue.count;
}
return reducedValue;
}
function assertResultsValid(results, expectedCount) {
assert.gt(results.length, 0, tojson(results));
assert.lte(results.length, expectedCount, tojson(results));
results.map(resultDoc => assert.eq(resultDoc.value.avgAge,
resultDoc.value.total / resultDoc.value.count,
tojson(results)));
}
// Inline output.
let res = assert.commandWorked(coll.mapReduce(map, reduce, {finalize: fin, out: {inline: 1}}));
assertResultsValid(res.results, states.length);
// Output mode "replace" to a non-existent unsharded collection.
const replaceColl = coll.getDB().mr_replace_out;
assert.commandWorked(coll.mapReduce(map, reduce, {finalize: fin, out: replaceColl.getName()}));
res = replaceColl.find().toArray();
assertResultsValid(res, states.length);
// Output mode "replace" to an existing unsharded collection.
assert.commandWorked(coll.mapReduce(map, reduce, {finalize: fin, out: replaceColl.getName()}));
res = replaceColl.find().toArray();
assertResultsValid(res, states.length);
function testMergeAgainstColl(mergeColl) {
// Output mode "merge" to a non-existent unsharded collection.
mergeColl.drop();
assert.commandWorked(coll.mapReduce(
map,
reduce,
{finalize: fin, out: {merge: mergeColl.getName(), db: mergeColl.getDB().getName()}}));
res = mergeColl.find().toArray();
assertResultsValid(res, states.length);
// Cache a sample result document to ensure that re-reducing actually occurs below.
let sampleDoc = mergeColl.findOne();
// Output mode "reduce" to an existing unsharded collection.
assert.commandWorked(coll.mapReduce(
map,
reduce,
{finalize: fin, out: {reduce: mergeColl.getName(), db: mergeColl.getDB().getName()}}));
res = mergeColl.find().toArray();
assertResultsValid(res, states.length);
assert.gte(mergeColl.findOne({_id: sampleDoc._id}).value.avgAge, sampleDoc.value.avgAge);
// Drop and recreate the target collection as sharded.
mergeColl.drop();
st.shardColl(mergeColl.getName(),
{_id: 1} /* Shard key */,
{_id: "MA"} /* Split at */,
{_id: "MA"} /* Move the chunk containing {state: MA} to its own shard */,
mergeColl.getDB().getName());
// Insert sentinel docs in the output collection to ensure that output mode "merge" does
// not blow it away. To workaround SERVER-44477, ensure that there is at least one document
// on each shard.
assert.commandWorked(mergeColl.insert({_id: "PA", value: {total: 5, avgAge: 5, count: 1}}));
assert.commandWorked(
mergeColl.insert({_id: "AL", value: {total: 50, avgAge: 50, count: 1}}));
// Output mode "merge" to an existing sharded collection.
assert.commandWorked(coll.mapReduce(map, reduce, {
finalize: fin,
out: {merge: mergeColl.getName(), db: mergeColl.getDB().getName(), sharded: true}
}));
res = mergeColl.find().toArray();
assertResultsValid(res, states.length + 2);
assert.eq(mergeColl.find({_id: "PA"}).itcount(), 1);
// Cache a sample result document to ensure that re-reducing actually occurs below.
sampleDoc = mergeColl.findOne({_id: {$not: {$in: ["AL", "PA"]}}});
// Output mode "reduce" to an existing sharded collection.
assert.commandWorked(coll.mapReduce(map, reduce, {
finalize: fin,
out: {reduce: mergeColl.getName(), db: mergeColl.getDB().getName(), sharded: true}
}));
res = mergeColl.find().toArray();
assertResultsValid(res, states.length + 2);
assert.gte(mergeColl.findOne({_id: sampleDoc._id}).value.avgAge, sampleDoc.value.avgAge);
}
// Test merge to a collection in the same database as the source collection.
testMergeAgainstColl(coll.getDB().mr_merge_out);
// Test merge to a collection in a foreign database. Creating the collection will also
// implicitly create the database.
assert.commandWorked(
coll.getDB().getSiblingDB("foreign_db").runCommand({create: "mr_merge_out"}));
testMergeAgainstColl(coll.getDB().getSiblingDB("foreign_db").mr_merge_out);
}
//
// Test against an all 4.2 cluster.
//
runValidMrTests(sourceColl);
//
// Upgrade the config servers and the shards to the "latest" binVersion.
//
st.upgradeCluster("latest", {upgradeShards: true, upgradeConfigs: true, upgradeMongos: false});
//
// Test against a mixed version cluster where the shards are upgraded to the latest binary but still
// in FCV 4.2. Mongos is still on the 4.2 binary version.
//
runValidMrTests(sourceColl);
//
// Upgrade mongos to the "latest" binVersion but keep the old FCV.
//
st.upgradeCluster("latest", {upgradeShards: false, upgradeConfigs: false, upgradeMongos: true});
mongosConn = st.s;
sourceColl = mongosConn.getDB(dbName)[collName];
//
// Test against a cluster where both mongos and the shards are upgraded to the latest binary
// version, but remain in the old FCV.
//
runValidMrTests(sourceColl);
//
// Fully upgraded to 4.4.
//
assert.commandWorked(
mongosConn.getDB(dbName).adminCommand({setFeatureCompatibilityVersion: latestFCV}));
runValidMrTests(sourceColl);
st.stop();
}());
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