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// Confirms that JavaScript heap limits are respected in aggregation. Includes testing for mapReduce
// and $where which use aggregation for execution.
(function() {
"use strict";
const st = new ShardingTest({shards: 2});
const mongos = st.s;
let mongosDB = mongos.getDB("test");
let mongosColl = mongosDB.coll;
// Shard the collection with one chunk per shard. Insert a single document into each shard.
st.shardColl(mongosColl.getName(), {x: 1}, {x: 2}, {x: 2});
assert.commandWorked(mongosColl.insert([{x: 0}, {x: 2}]));
// The limits chosen in this test for "tooSmallHeapSizeMB", "sufficentHeapSizeMB" and "arraySize"
// reflect a setup where allocating a string of size "arraySize" with a "tooSmallHeapSizeMB"
// JavaScript heap limit will trigger an OOM event, whereas allocating the same array with a
// "sufficentHeapSizeMB" JavaScript heap limit will succeed.
const tooSmallHeapSizeMB = 10;
const sufficentHeapSizeMB = 100;
function setHeapSizeLimitMB({db, queryLimit, globalLimit}) {
assert.commandWorked(
db.adminCommand({setParameter: 1, internalQueryJavaScriptHeapSizeLimitMB: queryLimit}));
assert.commandWorked(db.adminCommand({setParameter: 1, jsHeapLimitMB: globalLimit}));
}
function allocateLargeString() {
const arraySize = 1000000;
let str = new Array(arraySize).fill(0);
return true;
}
const mapReduce = {
mapReduce: "coll",
map: allocateLargeString,
reduce: function(k, v) {
return 1;
},
out: {inline: 1}
};
const aggregateWithJSFunction = {
aggregate: "coll",
cursor: {},
pipeline: [
{$group: {_id: "$x"}},
{$project: {y: {"$function": {args: [], body: allocateLargeString, lang: "js"}}}}
],
allowDiskUse: false
};
const aggregateWithInternalJsReduce = {
aggregate: "coll",
cursor: {},
pipeline: [{
$group: {
_id: "$x",
value: {
$_internalJsReduce: {
data: {k: "$x", v: "$x"},
eval: allocateLargeString,
}
}
}
}],
allowDiskUse: false
};
const aggregateWithUserDefinedAccumulator = {
aggregate: "coll",
cursor: {},
pipeline: [{
$group: {
_id: "$x",
value: {
$accumulator: {
init: allocateLargeString,
accumulate: allocateLargeString,
accumulateArgs: [{k: "$x", v: "$x"}],
merge: allocateLargeString,
lang: 'js',
}
}
}
}],
allowDiskUse: false
};
const findWithJavaScriptFunction = {
find: "coll",
filter: {$expr: {"$function": {args: [], body: allocateLargeString, lang: "js"}}}
};
const findWithWhere = {
find: "coll",
filter: {$where: allocateLargeString}
};
/**
* The following tests will execute JavaScript on the process represented by 'db' regardless of
* whether it is a mongod or mongos. This is because the JavaScript expressions live in the merger
* part of an aggregation pipeline.
*/
function runCommonTests(db) {
// All commands are expected to work with a sufficient JS heap size.
setHeapSizeLimitMB({db: db, queryLimit: sufficentHeapSizeMB, globalLimit: sufficentHeapSizeMB});
assert.commandWorked(db.runCommand(aggregateWithJSFunction));
assert.commandWorked(db.runCommand(aggregateWithInternalJsReduce));
assert.commandWorked(db.runCommand(aggregateWithUserDefinedAccumulator));
// The aggregate command is expected to fail when the aggregation specific heap size limit is
// too low.
setHeapSizeLimitMB({db: db, queryLimit: tooSmallHeapSizeMB, globalLimit: sufficentHeapSizeMB});
assert.commandFailedWithCode(db.runCommand(aggregateWithJSFunction),
ErrorCodes.JSInterpreterFailure);
assert.commandFailedWithCode(db.runCommand(aggregateWithInternalJsReduce),
ErrorCodes.JSInterpreterFailure);
assert.commandFailedWithCode(db.runCommand(aggregateWithUserDefinedAccumulator),
ErrorCodes.JSInterpreterFailure);
// All commands are expected to fail when the global heap size limit is too low, regardless
// of the aggregation limit.
setHeapSizeLimitMB({db: db, queryLimit: sufficentHeapSizeMB, globalLimit: tooSmallHeapSizeMB});
assert.commandFailedWithCode(db.runCommand(aggregateWithJSFunction),
ErrorCodes.JSInterpreterFailure);
assert.commandFailedWithCode(db.runCommand(aggregateWithInternalJsReduce),
ErrorCodes.JSInterpreterFailure);
assert.commandFailedWithCode(db.runCommand(aggregateWithUserDefinedAccumulator),
ErrorCodes.JSInterpreterFailure);
}
/**
* The following tests will execute JavaScript only on mongod. This is because $where and $expr are
* only evaluated on mongod, not on mongos.
*/
function runShardTests(db) {
// All commands are expected to work with a sufficient JS heap size.
setHeapSizeLimitMB({db: db, queryLimit: sufficentHeapSizeMB, globalLimit: sufficentHeapSizeMB});
assert.commandWorked(db.runCommand(findWithJavaScriptFunction));
// TODO SERVER-45454: Uncomment when $where is executed via aggregation JavaScript expression.
// assert.commandWorked(db.runCommand(findWithWhere));
assert.commandWorked(db.runCommand(mapReduce));
// A find command with JavaScript agg expression is expected to fail when the query specific
// heap size limit is too low.
setHeapSizeLimitMB({db: db, queryLimit: tooSmallHeapSizeMB, globalLimit: sufficentHeapSizeMB});
assert.commandFailedWithCode(db.runCommand(findWithJavaScriptFunction),
ErrorCodes.JSInterpreterFailure);
// The mapReduce command and $where are not limited by the query heap size limit and will
// succeed even if it is set too low.
setHeapSizeLimitMB({db: db, queryLimit: tooSmallHeapSizeMB, globalLimit: sufficentHeapSizeMB});
assert.commandWorked(db.runCommand(mapReduce));
// TODO SERVER-45454: Uncomment when $where is executed via aggregation JavaScript expression.
// assert.commandWorked(db.runCommand(findWithWhere));
// All commands are expected to fail when the global heap size limit is too low, regardless
// of the aggregation limit.
setHeapSizeLimitMB({db: db, queryLimit: sufficentHeapSizeMB, globalLimit: tooSmallHeapSizeMB});
assert.commandFailedWithCode(db.runCommand(findWithJavaScriptFunction),
ErrorCodes.JSInterpreterFailure);
// TODO SERVER-45454: Uncomment when $where is executed via aggregation JavaScript expression.
// assert.commandFailedWithCode(db.runCommand(findWithWhere), ErrorCodes.JSInterpreterFailure);
assert.commandFailedWithCode(db.runCommand(mapReduce), ErrorCodes.JSInterpreterFailure);
}
// Test command invocations that can execute JavaScript on either mongos or mongod.
runCommonTests(mongosDB);
// Test command invocations that will only execute JavaScript on the shards.
const shardDB = st.shard0.getDB("test");
runCommonTests(shardDB);
runShardTests(shardDB);
st.stop();
}());
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