88 lines
3.4 KiB
JavaScript
88 lines
3.4 KiB
JavaScript
/*
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* This script provides a runCommand override which intercepts CRUD/aggregation commands, creates
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* histograms for all indexed fields and then dispatches to the original command. It is intended to
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* be used for passthrough testing of the cost-based ranker.
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*/
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import {
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getCollectionName,
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getInnerCommand,
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isSystemCollectionName,
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isTimeSeriesCollection,
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} from "jstests/libs/cmd_object_utils.js";
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import {OverrideHelpers} from "jstests/libs/override_methods/override_helpers.js";
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// List of commands which this script will override to first construct histograms.
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const queryCommands = [
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"aggregate",
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"count",
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"delete",
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"distinct",
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"explain",
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"find",
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"findAndModify",
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"update",
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];
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// Predicate function which returns true if a histogram over the given path can be constructed.
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function isPathHistogrammable(path) {
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const components = path.split('.');
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return components.every(c => {
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return isNaN(Number(c)) && // Numeric path components are not supported.
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c !== "$**"; // Wildcard path not supported
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});
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}
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// Returns true if the given collection has a collation specified.
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function collectionHasCollation(db, collectionName) {
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const collectionInfo = db.getCollectionInfos({name: collectionName});
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if (!collectionInfo || collectionInfo.length === 0) {
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return false;
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}
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return collectionInfo[0].options.hasOwnProperty("collation");
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}
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// Returns true if the collection can have 'analyze' run on it.
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function isCollectionHistogrammable(db, coll) {
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// TODO SERVER-100679: Remove collation restriction
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return !coll.isCapped() && !isSystemCollectionName(coll.getName()) &&
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!isTimeSeriesCollection(db, coll.getName()) && !collectionHasCollation(db, coll.getName());
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}
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export function runCommandOverride(conn, dbName, _cmdName, cmdObj, clientFunction, makeFuncArgs) {
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// If we are running a non-query command, dispatch the original command. This is necessary to do
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// here because the getCollectionName() function below will run a command itself, resulting in a
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// recursive call to this function.
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if (!queryCommands.includes(_cmdName)) {
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return clientFunction.apply(conn, makeFuncArgs(cmdObj));
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}
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const db = conn.getDB(dbName);
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const innerCmd = getInnerCommand(cmdObj);
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const collectionName = getCollectionName(db, innerCmd);
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const coll = db[collectionName];
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// Make histograms for all indexed fields.
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if (collectionName !== undefined && isCollectionHistogrammable(db, coll)) {
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// Drop statistics collection. This should not be necessary, but it is currently a
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// workaround for SERVER-100679.
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db.system.statistics.getCollection(collectionName).drop();
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const indexes = coll.getIndexes();
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// Construct set of indexed paths
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let indexedPaths = new Set();
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indexes.forEach(index => Object.keys(index.key)
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.filter(isPathHistogrammable)
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.forEach(path => indexedPaths.add(path)));
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// Create histogram for each path
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indexedPaths.forEach(
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path => assert.commandWorked(db.runCommand({analyze: collectionName, key: path})));
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}
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// Dispatch to original command after creating histograms.
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return clientFunction.apply(conn, makeFuncArgs(cmdObj));
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}
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// Install the runCommand hook
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OverrideHelpers.overrideRunCommand(runCommandOverride);
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