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/**
* Tests that unbounded index scans access the storage engine with low priority.
*
* @tags: [
* requires_wiredtiger,
* ]
*/
(function() {
'use strict';
load('jstests/libs/os_helpers.js');
if (!isLinux()) {
return;
}
const conn = MongoRunner.runMongod();
const db = conn.getDB(jsTestName());
const coll = db.coll;
assert.commandWorked(db.adminCommand({setParameter: 1, internalQueryExecYieldIterations: 1}));
assert.commandWorked(coll.insert({a: 0}));
assert.commandWorked(coll.insert({a: 1}));
assert.commandWorked(coll.createIndexes([{a: 1}, {a: -1}]));
const numLowPriority = function() {
return db.serverStatus().wiredTiger.concurrentTransactions.read.lowPriority.finishedProcessing;
};
const testCoveredScanDeprioritized = function(direction) {
const numLowPriorityBefore = numLowPriority();
coll.find().hint({a: direction}).itcount();
assert.gt(numLowPriority(), numLowPriorityBefore);
};
testCoveredScanDeprioritized(1);
testCoveredScanDeprioritized(-1);
const testNonCoveredScanDeprioritized = function(direction) {
const numLowPriorityBefore = numLowPriority();
coll.find({b: 1}).hint({a: direction}).itcount();
assert.gt(numLowPriority(), numLowPriorityBefore);
};
testNonCoveredScanDeprioritized(1);
testNonCoveredScanDeprioritized(-1);
const testScanSortLimitDeprioritized = function(direction) {
const numLowPriorityBefore = numLowPriority();
coll.find().hint({a: direction}).sort({a: 1}).limit(1).itcount();
assert.gt(numLowPriority(), numLowPriorityBefore);
};
testScanSortLimitDeprioritized(1);
testScanSortLimitDeprioritized(-1);
const testScanLimitNotDeprioritized = function(direction) {
const numLowPriorityBefore = numLowPriority();
coll.find().hint({a: direction}).limit(1).itcount();
assert.eq(numLowPriority(), numLowPriorityBefore);
};
testScanLimitNotDeprioritized(1);
testScanLimitNotDeprioritized(-1);
MongoRunner.stopMongod(conn);
}());
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