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
|
s = new ShardingTest( "find_and_modify_sharded" , 2 , 2);
s.adminCommand( { enablesharding : "test" } );
db = s.getDB( "test" );
primary = s.getServer( "test" ).getDB( "test" );
secondary = s.getOther( primary ).getDB( "test" );
numObjs = 20;
// Turn balancer off - with small numbers of chunks the balancer tries to correct all imbalances, not just < 8
s.s.getDB( "config" ).settings.update({ _id : "balancer" }, { $set : { stopped : true } }, true )
s.adminCommand( { shardcollection : "test.stuff" , key : {_id:1} } );
// pre-split the collection so to avoid interference from balancer
s.adminCommand( { split: "test.stuff" , middle : { _id : numObjs/2 } } );
s.adminCommand( { movechunk : "test.stuff" , find : { _id : numObjs/2 } , to : secondary.getMongo().name } ) ;
for (var i=0; i < numObjs; i++){
db.stuff.insert({_id: i});
}
db.getLastError()
// put two docs in each chunk (avoid the split in 0, since there are no docs less than 0)
for (var i=2; i < numObjs; i+=2){
if (i == numObjs/2)
continue;
s.adminCommand( { split: "test.stuff" , middle : {_id: i} } );
}
s.printChunks();
assert.eq( numObjs/2, s.config.chunks.count(), "split failed" );
assert.eq( numObjs/4, s.config.chunks.count({ shard: "shard0000" }) );
assert.eq( numObjs/4, s.config.chunks.count({ shard: "shard0001" }) );
// update
for (var i=0; i < numObjs; i++){
assert.eq(db.stuff.count({b:1}), i, "2 A");
var out = db.stuff.findAndModify({query: {_id:i, b:null}, update: {$set: {b:1}}});
assert.eq(out._id, i, "2 E");
assert.eq(db.stuff.count({b:1}), i+1, "2 B");
}
// remove
for (var i=0; i < numObjs; i++){
assert.eq(db.stuff.count(), numObjs - i, "3 A");
assert.eq(db.stuff.count({_id: i}), 1, "3 B");
var out = db.stuff.findAndModify({remove: true, query: {_id:i}});
assert.eq(db.stuff.count(), numObjs - i - 1, "3 C");
assert.eq(db.stuff.count({_id: i}), 0, "3 D");
assert.eq(out._id, i, "3 E");
}
s.stop();
|
