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// 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();
})();
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