1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
// cursor1.js
// checks that cursors survive a chunk's move
(function() {
var s = new ShardingTest({name: "sharding_cursor1", shards: 2});
s.config.settings.find().forEach(printjson);
// create a sharded 'test.foo', for the moment with just one chunk
s.adminCommand({enablesharding: "test"});
s.ensurePrimaryShard('test', 'shard0001');
s.adminCommand({shardcollection: "test.foo", key: {_id: 1}});
db = s.getDB("test");
primary = s.getPrimaryShard("test").getDB("test");
secondary = s.getOther(primary).getDB("test");
var numObjs = 30;
var bulk = db.foo.initializeUnorderedBulkOp();
for (i = 0; i < numObjs; i++) {
bulk.insert({_id: i});
}
assert.writeOK(bulk.execute());
assert.eq(1, s.config.chunks.count(), "test requires collection to have one chunk initially");
// we'll split the collection in two and move the second chunk while three cursors are open
// cursor1 still has more data in the first chunk, the one that didn't move
// cursor2 buffered the last obj of the first chunk
// cursor3 buffered data that was moved on the second chunk
var cursor1 = db.foo.find().batchSize(3);
assert.eq(3, cursor1.objsLeftInBatch());
var cursor2 = db.foo.find().batchSize(5);
assert.eq(5, cursor2.objsLeftInBatch());
var cursor3 = db.foo.find().batchSize(7);
assert.eq(7, cursor3.objsLeftInBatch());
s.adminCommand({split: "test.foo", middle: {_id: 5}});
s.adminCommand({movechunk: "test.foo", find: {_id: 5}, to: secondary.getMongo().name});
assert.eq(2, s.config.chunks.count());
// the cursors should not have been affected
assert.eq(numObjs, cursor1.itcount(), "c1");
assert.eq(numObjs, cursor2.itcount(), "c2");
assert.eq(numObjs, cursor3.itcount(), "c3");
// Test that a cursor with a 1 second timeout eventually times out.
gc();
gc();
var cur = db.foo.find().batchSize(2);
assert(cur.next(), "T1");
assert(cur.next(), "T2");
assert.commandWorked(s.admin.runCommand({
setParameter: 1,
cursorTimeoutMillis: 1000 // 1 second.
}));
assert.soon(function() {
try {
cur.next();
cur.next();
print("cursor still alive");
return false;
} catch (e) {
return true;
}
}, "cursor failed to time out", /*timeout*/ 30000, /*interval*/ 5000);
gc();
gc();
s.stop();
})();
|
