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/**
* Confirms that the limit on number of aggregragation pipeline stages is respected.
*/
(function() {
"use strict";
load("jstests/libs/fixture_helpers.js");
function testLimits(testDB, lengthLimit) {
let maxLength = lengthLimit;
let tooLarge = lengthLimit + 1;
assert.commandWorked(testDB.runCommand({
aggregate: "test",
cursor: {},
pipeline: new Array(maxLength).fill({$project: {_id: 1}})
}));
assert.commandFailedWithCode(testDB.runCommand({
aggregate: "test",
cursor: {},
pipeline: new Array(tooLarge).fill({$project: {_id: 1}})
}),
ErrorCodes.FailedToParse);
testDB.setLogLevel(1);
assert.commandWorked(testDB.runCommand({
aggregate: "test",
cursor: {},
pipeline: [
{$unionWith: {coll: "test", pipeline: new Array(maxLength).fill({$project: {_id: 1}})}}
]
}));
assert.commandFailedWithCode(testDB.runCommand({
aggregate: "test",
cursor: {},
pipeline:
[{$unionWith: {coll: "test", pipeline: new Array(tooLarge).fill({$project: {_id: 1}})}}]
}),
ErrorCodes.FailedToParse);
assert.commandWorked(testDB.runCommand({
aggregate: "test",
cursor: {},
pipeline: [{$facet: {foo: new Array(maxLength).fill({$project: {_id: 1}})}}]
}));
assert.commandFailedWithCode(testDB.runCommand({
aggregate: "test",
cursor: {},
pipeline: [{$facet: {foo: new Array(tooLarge).fill({$project: {_id: 1}}), bar: []}}]
}),
ErrorCodes.FailedToParse);
assert.commandWorked(testDB.runCommand(
{update: "test", updates: [{q: {}, u: new Array(maxLength).fill({$project: {_id: 1}})}]}));
assert.commandFailedWithCode(testDB.runCommand({
update: "test",
updates: [{q: {}, u: new Array(tooLarge).fill({$project: {_id: 1}})}]
}),
ErrorCodes.FailedToParse);
const collname = "test";
[ // Long pipelines with many unions.
new Array(maxLength).fill({$unionWith: collname}),
// maxLength * 2 total unions.
new Array(maxLength).fill(
{$unionWith: {coll: collname, pipeline: [{$unionWith: collname}]}}),
// maxLength in subPipeline.
[{
$unionWith:
{coll: collname, pipeline: new Array(maxLength).fill({$unionWith: collname})}
}],
// maxLength * 50 total unions, should be within max doc size.
new Array(maxLength).fill(
{$unionWith: {coll: collname, pipeline: new Array(50).fill({$unionWith: collname})}})]
.forEach((pipeline) => {
assert.commandWorked(testDB.runCommand({
aggregate: collname,
cursor: {},
pipeline,
}));
});
// Long pipelines filled with the same stage over and over.
[{$addFields: {foo: 1}},
{$bucketAuto: {groupBy: "$nonExistentField", buckets: 1}},
{
$graphLookup:
{from: collname, startWith: "$_id", connectFromField: "_id", connectToField: "_id", as: "foo"}
},
{$group: {_id: "$_id"}},
{$limit: 1},
{$lookup: {from: collname, localField: "_id", foreignField: "_id", as: "foo"}},
{$match: {_id: {$exists: true}}},
{$project: {_id: 1}},
{$redact: "$$KEEP"},
{$replaceWith: "$$ROOT"},
{$skip: 1},
{$sort: {_id: 1}},
// unionWith already covered.
{$unwind: "$_id"}]
.forEach((stage) => {
assert.commandWorked(testDB.runCommand({
aggregate: collname,
cursor: {},
pipeline: new Array(maxLength).fill(stage)
}));
});
// Same test, but these to stages get replaced by 2 stages under the hood.
[{$bucket: {groupBy: "$nonExistentField", boundaries: [0, 1], default: 2}},
{$sortByCount: "$_id"}]
.forEach((stage) => assert.commandWorked(testDB.runCommand({
aggregate: collname,
cursor: {},
pipeline: new Array(parseInt(maxLength / 2)).fill(stage)
})));
// $lookup inserts a DocumentSourceSequentialDocumentCache stage in the subpipeline to perform
// cacheing optimizations, so the subpipeline can have at most 'maxLength - 1' user-specified
// stages. When we connect directly to a shard without mongos, it is treated as a standalone
// and will not perform pipeline length validation after the cache stage is added.
if (FixtureHelpers.isMongos(testDB)) {
maxLength = maxLength - 1;
tooLarge = tooLarge - 1;
}
assert.commandWorked(testDB.runCommand({
aggregate: "test",
cursor: {},
pipeline: [{
$lookup:
{from: "test", as: "as", pipeline: new Array(maxLength).fill({$project: {_id: 1}})}
}]
}));
assert.commandFailedWithCode(testDB.runCommand({
aggregate: "test",
cursor: {},
pipeline: [{
$lookup:
{from: "test", as: "as", pipeline: new Array(tooLarge).fill({$project: {_id: 1}})}
}]
}),
ErrorCodes.FailedToParse);
}
function runTest(lengthLimit, mongosConfig = {}, mongodConfig = {}) {
const st = new ShardingTest(
{shards: 2, rs: {nodes: 1}, other: {mongosOptions: mongosConfig, rsOptions: mongodConfig}});
assert.commandWorked(st.s0.adminCommand({enablesharding: "test"}));
assert.commandWorked(st.s0.adminCommand({shardCollection: "test.foo", key: {_id: "hashed"}}));
let mongosDB = st.s0.getDB("test");
assert.commandWorked(mongosDB.test.insert([{}, {}, {}, {}]));
// Run test against mongos.
testLimits(mongosDB, lengthLimit);
// Run test against shard.
let shard0DB = st.rs0.getPrimary().getDB("test");
testLimits(shard0DB, lengthLimit);
st.stop();
}
// This is a sanity check to make sure that the default value is correct. If the limit is changed,
// it will break for users and this check catches that.
const st = new ShardingTest({shards: 1, rs: {nodes: 1}});
let buildInfo = assert.commandWorked(st.s0.getDB("test").adminCommand("buildInfo"));
let pipelineLimit =
assert.commandWorked(st.s0.adminCommand({"getParameter": 1, "internalPipelineLengthLimit": 1}));
let expectedPipelineLimit = buildInfo.debug ? 200 : 1000;
assert.eq(expectedPipelineLimit, pipelineLimit["internalPipelineLengthLimit"]);
const shardPrimary = st.rs0.getPrimary().getDB("test");
buildInfo = assert.commandWorked(shardPrimary.adminCommand("buildInfo"));
expectedPipelineLimit = buildInfo.debug ? 200 : 1000;
pipelineLimit = assert.commandWorked(
shardPrimary.adminCommand({"getParameter": 1, "internalPipelineLengthLimit": 1}));
assert.eq(expectedPipelineLimit, pipelineLimit["internalPipelineLengthLimit"]);
st.stop();
// Test with modified pipeline length limit.
runTest(50,
{setParameter: {internalPipelineLengthLimit: 50}},
{setParameter: {internalPipelineLengthLimit: 50}});
})();
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