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// @tags: [does_not_support_stepdowns, requires_capped]
// Check that a warning message about doing a capped collection scan for a query with an _id
// constraint is printed at appropriate times. SERVER-5353
function numWarnings() {
logs = db.adminCommand({getLog: "global"}).log;
ret = 0;
logs.forEach(function(x) {
if (x.match(warningMatchRegexp)) {
++ret;
}
});
return ret;
}
collectionNameIndex = 0;
// Generate a collection name not already present in the log.
do {
testCollectionName = 'jstests_queryoptimizera__' + collectionNameIndex++;
warningMatchString =
'unindexed _id query on capped collection.*collection: test.' + testCollectionName;
warningMatchRegexp = new RegExp(warningMatchString);
} while (numWarnings() > 0);
t = db[testCollectionName];
t.drop();
notCappedCollectionName = testCollectionName + '_notCapped';
notCapped = db.getSiblingDB("local").getCollection(notCappedCollectionName);
notCapped.drop();
assert.commandWorked(db.createCollection(testCollectionName, {capped: true, size: 1000}));
assert.commandWorked(
notCapped.getDB().createCollection(notCappedCollectionName, {autoIndexId: false}));
t.insert({});
notCapped.insert({});
oldNumWarnings = 0;
function assertNoNewWarnings() {
assert.eq(oldNumWarnings, numWarnings());
}
function assertNewWarning() {
newNumWarnings = numWarnings();
// Ensure that newNumWarnings > oldNumWarnings. It's not safe to test that oldNumWarnings + 1
// == newNumWarnings, because a (simulated) page fault exception may cause multiple messages to
// be logged instead of only one.
assert.lt(oldNumWarnings, newNumWarnings);
oldNumWarnings = newNumWarnings;
}
// Simple _id query
t.find({_id: 0}).itcount();
assertNoNewWarnings();
// Simple _id query without an _id index, on a non capped collection.
notCapped.find({_id: 0}).itcount();
assertNoNewWarnings();
// A multi field query, including _id.
t.find({_id: 0, a: 0}).itcount();
assertNoNewWarnings();
// An unsatisfiable query.
t.find({_id: 0, a: {$in: []}}).itcount();
assertNoNewWarnings();
// An hinted query.
t.find({_id: 0}).hint({$natural: 1}).itcount();
assertNoNewWarnings();
// Retry a multi field query.
t.find({_id: 0, a: 0}).itcount();
assertNoNewWarnings();
// Warnings should not be printed when an index is added on _id.
t.ensureIndex({_id: 1});
t.find({_id: 0}).itcount();
assertNoNewWarnings();
t.find({_id: 0, a: 0}).itcount();
assertNoNewWarnings();
t.find({_id: 0, a: 0}).itcount();
assertNoNewWarnings();
t.drop(); // cleanup
notCapped.drop();
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