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/**
* Test that spilling to disk is prohibited in queryable backup (read-only) mode and when the
* parameter 'recoverFromOplogAsStandalone' is set to 'true'.
*
* The 'requires_persistence' tag exludes the test from running with 'inMemory' and
* 'ephemeralForTest' storage engines that do not support queryable backup (read-only) mode.
* @tags: [
* requires_persistence,
* requires_replication
* ]
*/
(function() {
"use strict";
const memoryLimitMb = 1;
const memoryLimitBytes = 1 * 1024 * 1024;
const largeStr = "A".repeat(1024 * 1024); // 1MB string
function prepareData(conn) {
const testDb = conn.getDB(jsTestName());
testDb.largeColl.drop();
// Create a collection exceeding the memory limit.
for (let i = 0; i < memoryLimitMb + 1; ++i)
assert.commandWorked(testDb.largeColl.insert({x: i, largeStr: largeStr + i}));
// Create a view on a large collection containg a sort operation.
testDb.largeView.drop();
assert.commandWorked(testDb.createView("largeView", "largeColl", [{$sort: {x: -1}}]));
}
function runTest(conn, allowDiskUseByDefault) {
const testDb = conn.getDB(jsTestName());
const coll = testDb.largeColl;
const view = testDb.largeView;
function assertFailed(cmdObject) {
assert.commandFailedWithCode(testDb.runCommand(cmdObject),
ErrorCodes.QueryExceededMemoryLimitNoDiskUseAllowed);
}
assert.commandWorked(
testDb.adminCommand({setParameter: 1, allowDiskUseByDefault: allowDiskUseByDefault}));
// The 'aggregate' pipelines running within the memory limit must pass.
assert.eq(1, coll.aggregate([{$match: {x: 1}}]).itcount());
assert.eq(1,
coll.aggregate([{$match: {x: 1}}], {allowDiskUse: !allowDiskUseByDefault}).itcount());
// The 'aggregate' grouping exceeding the memory limit must fail.
assertFailed({
aggregate: coll.getName(),
pipeline: [{$group: {_id: '$largeStr', minId: {$min: '$_id'}}}],
cursor: {}
});
assertFailed({
aggregate: coll.getName(),
pipeline: [{$group: {_id: '$largeStr', minId: {$min: '$_id'}}}],
cursor: {},
allowDiskUse: !allowDiskUseByDefault
});
// The 'aggregate' sort exceeding the memory limit must fail.
assertFailed({aggregate: coll.getName(), pipeline: [{$sort: {x: -1}}], cursor: {}});
assertFailed({
aggregate: coll.getName(),
pipeline: [{$sort: {x: -1}}],
cursor: {},
allowDiskUse: !allowDiskUseByDefault
});
// The 'find' queries within the memory limit must pass.
assert.eq(1, coll.find({x: 1}).itcount());
assert.eq(1, coll.find({x: 1}).allowDiskUse(!allowDiskUseByDefault).itcount());
// The 'find' and sort queries exceeding the memory limit must fail.
assertFailed({find: coll.getName(), sort: {x: -1}});
assertFailed({find: coll.getName(), sort: {x: -1}, allowDiskUse: !allowDiskUseByDefault});
// The 'mapReduce' command running within the memory limit must pass.
assert.eq(coll.mapReduce(
function() {
emit("x", 1);
},
function(k, v) {
return Array.sum(v);
},
{out: {inline: 1}})
.results[0]
.value,
memoryLimitMb + 1);
// The 'mapReduce' command exceeding the memory limit must fail.
assertFailed({
mapReduce: coll.getName(),
map: function() {
emit("x", this.largeStr);
},
reduce: function(k, v) {
return 42;
},
out: {inline: 1}
});
// The 'count' command within the memory limit must pass.
assert.eq(coll.count(), memoryLimitMb + 1);
// The 'count' command exceeding the memory limit must fail.
assertFailed({count: view.getName()});
// The 'distinct' command within the memory limit must pass.
assert.eq(coll.distinct("x"), [0, 1]);
// The 'distinct' command exceeding the memory limit must fail.
assertFailed({distinct: view.getName(), key: "largeStr"});
}
// Create a replica set with just one node and add some data.
const rst = new ReplSetTest({nodes: 1});
rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
prepareData(primary);
rst.stopSet(/*signal=*/null, /*forRestart=*/true);
const tightMemoryLimits = {
internalDocumentSourceGroupMaxMemoryBytes: memoryLimitBytes,
internalQueryMaxBlockingSortMemoryUsageBytes: memoryLimitBytes,
internalQuerySlotBasedExecutionHashAggApproxMemoryUseInBytesBeforeSpill: memoryLimitBytes
};
// Start the mongod in a queryable backup mode with the existing dbpath.
const connQueryableBackup = MongoRunner.runMongod({
dbpath: primary.dbpath,
noCleanData: true,
queryableBackupMode: "",
setParameter: tightMemoryLimits
});
assert.neq(null, connQueryableBackup, "mongod was unable to start up");
runTest(connQueryableBackup, true);
runTest(connQueryableBackup, false);
MongoRunner.stopMongod(connQueryableBackup);
// Recover the mongod from oplog as a standalone with the existing dbpath.
const connRecoverStandalone = MongoRunner.runMongod({
dbpath: primary.dbpath,
noCleanData: true,
setParameter: Object.assign(tightMemoryLimits, {recoverFromOplogAsStandalone: true})
});
assert.neq(null, connRecoverStandalone, "mongod was unable to start up");
runTest(connRecoverStandalone, true);
runTest(connRecoverStandalone, false);
MongoRunner.stopMongod(connRecoverStandalone);
})();
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