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/**
* Tests for using collStats to retrieve count information.
*
* @tags: [
* requires_replication,
* requires_sharding,
* ]
*/
(function() {
"use strict";
const dbName = jsTestName();
const collName = "test";
function getShardCount(counts, shardName) {
for (let i = 0; i < counts.length; i++) {
if (counts[i]["shard"] == shardName)
return counts[i];
}
return {count: null};
}
/* Accepts a dbName, collName, and shardDistribution (array of positive integers or nulls).
* Creates a sharded cluster with shardDistribution.length shards and shardDistribution[i] documents
* on the i-th shard or no chunks assigned to that shard if shardDistribution[i] is null.
*/
function runShardingTestExists(shardDistribution) {
const st = ShardingTest({shards: shardDistribution.length});
const mongos = st.s0;
const admin = mongos.getDB("admin");
const config = mongos.getDB("config");
const shards = config.shards.find().toArray();
const namespace = dbName + "." + collName;
/* Shard the collection. */
assert.commandWorked(admin.runCommand({enableSharding: dbName}));
assert.commandWorked(admin.runCommand({movePrimary: dbName, to: shards[0]._id}));
assert.commandWorked(admin.runCommand({shardCollection: namespace, key: {a: 1}}));
const coll = mongos.getCollection(namespace);
const length = shardDistribution.length;
let curr = 0;
let startChunk = curr;
for (let i = 0; i < length; i++) {
for (startChunk = curr;
shardDistribution[i] != null && curr < startChunk + shardDistribution[i];
curr++) {
/* Insert shardDistribution[i] documents into the current chunk.*/
assert.commandWorked(coll.insert({a: curr}));
}
/* We need to ensure that we don't split at the same location as we spit previously. */
if (shardDistribution[i] == 0) {
curr++;
}
/* If the i-th shard is supposed to have documents then split the chunk to the right of
* where it is supposed to end. Otherwise do not split the chunk. */
if (shardDistribution[i] != null) {
assert.commandWorked(st.splitAt(namespace, {a: curr}));
}
/* Move the "next" chunk to the next shard */
assert.commandWorked(admin.runCommand(
{moveChunk: namespace, find: {a: curr + 1}, to: shards[(i + 1) % length]._id}));
}
/* Move the remaining chunk to the first shard which is supposed to have documents. */
for (let j = 0; shardDistribution[j] == null && j < length; j++)
assert.commandWorked(
admin.runCommand({moveChunk: namespace, find: {a: curr + 1}, to: shards[j + 1]._id}));
const counts = coll.aggregate([{"$collStats": {"count": {}}}]).toArray();
for (let i = 0; i < shards.length; i++) {
assert.eq(getShardCount(counts, shards[i]._id)["count"], shardDistribution[i]);
}
st.stop();
}
function runUnshardedCollectionShardTestExists(shardNum, docsNum) {
const st = ShardingTest({shards: shardNum});
const mongos = st.s0;
const admin = mongos.getDB("admin");
const namespace = dbName + "." + collName;
const coll = mongos.getCollection(namespace);
/* Shard the collection. */
assert.commandWorked(admin.runCommand({enableSharding: dbName}));
for (let i = 0; i < docsNum; i++) {
assert.commandWorked(coll.insert({a: i}));
}
const counts = coll.aggregate([{"$collStats": {"count": {}}}]).toArray();
assert.eq(counts.length, 1);
assert.eq(counts[0]["count"], docsNum);
assert.eq(counts[0].hasOwnProperty("shard"), true);
st.stop();
}
function runReplicaSetTestExists(nodesNum, docsNum) {
const namespace = dbName + '.' + collName;
const rst = ReplSetTest({nodes: nodesNum});
rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const coll = primary.getCollection(namespace);
for (let i = 0; i < docsNum; i++) {
assert.commandWorked(coll.insert({a: i}));
}
const counts = coll.aggregate([{"$collStats": {"count": {}}}]).toArray();
assert.eq(counts.length, 1);
assert.eq(counts[0]["count"], docsNum);
assert.eq(counts[0].hasOwnProperty("shard"), false);
rst.stopSet();
}
function runStandaloneTestExists(docsNum) {
const namespace = dbName + '.' + collName;
const conn = MongoRunner.runMongod({});
const coll = conn.getCollection(namespace);
for (let i = 0; i < docsNum; i++) {
assert.commandWorked(coll.insert({a: i}));
}
const counts = coll.aggregate([{"$collStats": {"count": {}}}]).toArray();
assert.eq(counts.length, 1);
assert.eq(counts[0]["count"], docsNum);
MongoRunner.stopMongod(conn);
}
runShardingTestExists([1, 2]);
runShardingTestExists([null, 1, 2]);
runShardingTestExists([null, 0, 2]);
runShardingTestExists([null, 2, 0]);
runReplicaSetTestExists(1, 4);
runStandaloneTestExists(4);
runStandaloneTestExists(6);
runUnshardedCollectionShardTestExists(3, 4);
runUnshardedCollectionShardTestExists(2, 3);
const doesNotExistName = "dne";
/* Test that if a collection does not exist that the database throws NamespaceNotFound. */
const st = ShardingTest({shards: 3});
const mongos = st.s0;
const stDb = mongos.getDB(dbName);
assert.commandFailedWithCode(
stDb.runCommand(
{aggregate: doesNotExistName, pipeline: [{"$collStats": {"count": {}}}], cursor: {}}),
ErrorCodes.NamespaceNotFound);
assert.commandFailedWithCode(
stDb.runCommand(
{aggregate: doesNotExistName, pipeline: [{"$collStats": {"unknown": {}}}], cursor: {}}),
40415);
assert.commandFailedWithCode(stDb.runCommand({
aggregate: doesNotExistName,
pipeline: [{"$collStats": {"queryExecStats": {}}}],
cursor: {}
}),
ErrorCodes.NamespaceNotFound);
st.stop();
const rst = ReplSetTest({nodes: 3});
rst.startSet();
rst.initiate();
const rstDb = rst.getPrimary().getDB(dbName);
assert.commandFailedWithCode(
rstDb.runCommand(
{aggregate: doesNotExistName, pipeline: [{"$collStats": {"count": {}}}], cursor: {}}),
ErrorCodes.NamespaceNotFound);
rst.stopSet();
const conn = MongoRunner.runMongod({});
const standaloneDb = conn.getDB(dbName);
assert.commandFailedWithCode(
standaloneDb.runCommand(
{aggregate: doesNotExistName, pipeline: [{"$collStats": {"count": {}}}], cursor: {}}),
ErrorCodes.NamespaceNotFound);
assert.commandFailedWithCode(
standaloneDb.runCommand(
{aggregate: doesNotExistName, pipeline: [{"$collStats": {"unknown": {}}}], cursor: {}}),
40415);
assert.commandFailedWithCode(standaloneDb.runCommand({
aggregate: doesNotExistName,
pipeline: [{"$collStats": {"queryExecStats": {}}}],
cursor: {}
}),
ErrorCodes.NamespaceNotFound);
MongoRunner.stopMongod(conn);
})();
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