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/**
* Tests that unbounded collections 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}));
const runTest = function(options) {
assert.commandWorked(db.createCollection(coll.getName(), options));
assert.commandWorked(coll.insert({_id: 0}));
assert.commandWorked(coll.insert({_id: 1}));
const numLowPriority = function() {
return db.serverStatus()
.wiredTiger.concurrentTransactions.read.lowPriority.finishedProcessing;
};
const testScanDeprioritized = function(direction) {
const numLowPriorityBefore = numLowPriority();
coll.find().hint({$natural: direction}).itcount();
assert.gt(numLowPriority(), numLowPriorityBefore);
};
testScanDeprioritized(1);
testScanDeprioritized(-1);
const testScanSortLimitDeprioritized = function(direction) {
const numLowPriorityBefore = numLowPriority();
coll.find().hint({$natural: direction}).sort({_id: 1}).limit(1).itcount();
assert.gt(numLowPriority(), numLowPriorityBefore);
};
testScanSortLimitDeprioritized(1);
testScanSortLimitDeprioritized(-1);
const testScanLimitNotDeprioritized = function(direction) {
const numLowPriorityBefore = numLowPriority();
coll.find().hint({$natural: direction}).limit(1).itcount();
assert.eq(numLowPriority(), numLowPriorityBefore);
};
testScanLimitNotDeprioritized(1);
testScanLimitNotDeprioritized(-1);
assert(coll.drop());
};
runTest({});
runTest({clusteredIndex: {key: {_id: 1}, unique: true}});
MongoRunner.stopMongod(conn);
}());
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