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// Test that map reduce and aggregate properly handle shard versioning.
(function() {
"use strict";
const st = new ShardingTest({shards: 2, mongos: 3});
const dbName = jsTest.name();
const nsString = dbName + ".coll";
const numDocs = 50000;
const numKeys = 1000;
st.s.adminCommand({enableSharding: dbName});
st.ensurePrimaryShard(dbName, st.shard0.shardName);
st.s.adminCommand({shardCollection: nsString, key: {key: 1}});
// Load chunk data to the stale mongoses before moving a chunk
const staleMongos1 = st.s1;
const staleMongos2 = st.s2;
staleMongos1.getCollection(nsString).find().itcount();
staleMongos2.getCollection(nsString).find().itcount();
st.s.adminCommand({split: nsString, middle: {key: numKeys / 2}});
st.s.adminCommand({moveChunk: nsString, find: {key: 0}, to: st.shard1.shardName});
const bulk = st.s.getCollection(nsString).initializeUnorderedBulkOp();
for (let i = 0; i < numDocs; i++) {
bulk.insert({_id: i, key: (i % numKeys), value: i % numKeys});
}
assert.commandWorked(bulk.execute());
// Add orphaned documents directly to the shards to ensure they are properly filtered out.
st.shard0.getCollection(nsString).insert({_id: 0, key: 0, value: 0});
st.shard1.getCollection(nsString).insert({_id: numDocs, key: numKeys, value: numKeys});
const map = function() {
emit(this.key, this.value);
};
const reduce = function(k, values) {
let total = 0;
for (let i = 0; i < values.length; i++) {
total += values[i];
}
return total;
};
function validateOutput(output) {
assert.eq(output.length, numKeys, tojson(output));
for (let i = 0; i < output.length; i++) {
assert.eq(output[i]._id * (numDocs / numKeys), output[i].value, tojson(output));
}
}
let res = staleMongos1.getCollection(nsString).mapReduce(map, reduce, {out: {inline: 1}});
validateOutput(res.results);
res = staleMongos2.getCollection(nsString).aggregate(
[{$group: {_id: "$key", value: {$sum: "$value"}}}, {$sort: {_id: 1}}]);
validateOutput(res.toArray());
st.stop();
})();
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