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/**
* Tests that the cardinality and frequency metrics calculation within the analyzeShardKey command
* prioritizes indexes that allows it to infer if the shard key is unique.
*
* @tags: [requires_fcv_70]
*/
(function() {
"use strict";
load("jstests/libs/fail_point_util.js");
load("jstests/libs/uuid_util.js"); // for 'extractUUIDFromObject'
load("jstests/sharding/analyze_shard_key/libs/analyze_shard_key_util.js");
const numNodesPerRS = 2;
const numMostCommonValues = 5;
// The write concern to use when inserting documents into test collections. Waiting for the
// documents to get replicated to all nodes is necessary since mongos runs the analyzeShardKey
// command with readPreference "secondaryPreferred".
const writeConcern = {
w: numNodesPerRS
};
function testAnalyzeShardKey(conn, {docs, indexSpecs, shardKeys, metrics}) {
const dbName = "testDb-" + extractUUIDFromObject(UUID());
const collName = "testColl";
const ns = dbName + "." + collName;
jsTest.log(`Testing ${tojson({dbName, collName, docs, indexSpecs, shardKeys, metrics})}`);
const db = conn.getDB(dbName);
const coll = db.getCollection(collName);
assert.commandWorked(db.runCommand({createIndexes: collName, indexes: indexSpecs}));
assert.commandWorked(coll.insert(docs, {writeConcern}));
for (let shardKey of shardKeys) {
const res = assert.commandWorked(conn.adminCommand({analyzeShardKey: ns, key: shardKey}));
AnalyzeShardKeyUtil.assertKeyCharacteristicsMetrics(res, metrics);
}
}
function runTest(conn) {
testAnalyzeShardKey(conn, {
docs: [{x: -1}, {x: 1}],
indexSpecs: [
{
name: "x_hashed",
key: {x: "hashed"},
},
{
name: "x_1",
key: {x: 1},
unique: true,
}
],
shardKeys: [{x: 1}, {x: "hashed"}],
metrics: {
numDocs: 2,
isUnique: true,
numDistinctValues: 2,
mostCommonValues: [{value: {x: -1}, frequency: 1}, {value: {x: 1}, frequency: 1}],
numMostCommonValues
}
});
testAnalyzeShardKey(conn, {
docs: [{x: -1}, {x: 1}],
indexSpecs: [
{
name: "x_1_not_unique",
key: {x: 1},
},
{
name: "x_1_unique",
key: {x: 1},
unique: true,
}
],
shardKeys: [{x: 1}, {x: "hashed"}],
metrics: {
numDocs: 2,
isUnique: true,
numDistinctValues: 2,
mostCommonValues: [{value: {x: -1}, frequency: 1}, {value: {x: 1}, frequency: 1}],
numMostCommonValues
}
});
testAnalyzeShardKey(conn, {
docs: [{x: -1, y: -1}, {x: 1, y: 1}],
indexSpecs: [
{
name: "x_1_y_1",
key: {x: 1, y: 1},
unique: true,
},
{
name: "x_1",
key: {x: 1},
}
],
shardKeys: [{x: 1}, {x: "hashed"}],
metrics: {
numDocs: 2,
isUnique: false,
numDistinctValues: 2,
mostCommonValues: [{value: {x: -1}, frequency: 1}, {value: {x: 1}, frequency: 1}],
numMostCommonValues
}
});
testAnalyzeShardKey(conn, {
docs: [{x: -1, y: -1, z: -1}, {x: 1, y: 1, z: 1}],
indexSpecs: [
{
name: "x_1_y_1_z_1",
key: {x: 1, y: 1, z: 1},
unique: true,
},
{
name: "x_1_y_1",
key: {x: 1, y: 1},
unique: true,
}
],
shardKeys: [{x: 1, y: 1}, {x: "hashed", y: 1}],
metrics: {
numDocs: 2,
isUnique: true,
numDistinctValues: 2,
mostCommonValues:
[{value: {x: -1, y: -1}, frequency: 1}, {value: {x: 1, y: 1}, frequency: 1}],
numMostCommonValues
}
});
}
const setParameterOpts = {
analyzeShardKeyNumMostCommonValues: numMostCommonValues,
// Skip calculating the read and write distribution metrics since there are no sampled queries
// anyway.
"failpoint.analyzeShardKeySkipCalcalutingReadWriteDistributionMetrics":
tojson({mode: "alwaysOn"})
};
{
const st =
new ShardingTest({shards: 1, rs: {nodes: numNodesPerRS, setParameter: setParameterOpts}});
runTest(st.s);
st.stop();
}
{
const rst =
new ReplSetTest({nodes: numNodesPerRS, nodeOptions: {setParameter: setParameterOpts}});
rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
runTest(primary);
rst.stopSet();
}
})();
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