54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
// Regression test for edge cases in which .snapshot() queries could historically miss documents or
|
|
// return the same document twice.
|
|
(function() {
|
|
'use strict';
|
|
|
|
var cursor;
|
|
var coll = db.snapshot_queries;
|
|
coll.drop();
|
|
|
|
//
|
|
// Test that a large update to the document we just returned won't cause us to return it again.
|
|
//
|
|
|
|
for (var i = 0; i < 3; i++) {
|
|
assert.writeOK(coll.insert({_id: i}));
|
|
}
|
|
|
|
cursor = coll.find().batchSize(2).snapshot();
|
|
assert.eq(0, cursor.next()["_id"]);
|
|
assert.eq(1, cursor.next()["_id"]);
|
|
|
|
// Force a document move (on MMAP) while the query is yielded for a getMore.
|
|
var bigString = Array(1024*1024).toString()
|
|
assert.writeOK(coll.update({_id: 1}, {$set: {padding: bigString}}));
|
|
|
|
assert.eq(2, cursor.next()["_id"]);
|
|
assert(!cursor.hasNext());
|
|
|
|
//
|
|
// Test that a large update to the document we are about to return won't cause us to skip that
|
|
// doc.
|
|
//
|
|
|
|
coll.drop();
|
|
assert.writeOK(coll.insert({_id: 0, padding: Array(1000).toString()}));
|
|
for (var i = 1; i <= 3; i++) {
|
|
assert.writeOK(coll.insert({_id: i}));
|
|
}
|
|
|
|
// On MMAP, this will leave space at the beginning of the collection. A document can be moved
|
|
// into this free space.
|
|
assert.writeOK(coll.remove({_id: 0}));
|
|
|
|
cursor = coll.find().snapshot().batchSize(2);
|
|
assert.eq(1, cursor.next()["_id"]);
|
|
assert.eq(2, cursor.next()["_id"]);
|
|
|
|
// Force a document move (on MMAP) while the query is yielded for a getMore.
|
|
assert.writeOK(coll.update({_id: 3}, {$set: {padding: Array(100).toString()}}));
|
|
|
|
assert.eq(3, cursor.next()["_id"]);
|
|
assert(!cursor.hasNext());
|
|
})();
|