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// Test the awaitData flag for the find/getMore commands.
(function() {
'use strict';
var mongo = MongoRunner.runMongod({master: ""});
var cmdRes;
var cursorId;
var defaultBatchSize = 101;
var collName = 'await_data';
var db = mongo.getDB("test");
var coll = db[collName];
var localDB = db.getSiblingDB("local");
var oplogColl = localDB.oplog.$main;
// Create a non-capped collection with 10 documents.
coll.drop();
for (var i = 0; i < 10; i++) {
assert.writeOK(coll.insert({a: i}));
}
// Find with tailable flag set should fail for a non-capped collection.
cmdRes = db.runCommand({find: collName, tailable: true});
assert.commandFailed(cmdRes);
// Should also fail in the non-capped case if both the tailable and awaitData flags are set.
cmdRes = db.runCommand({find: collName, tailable: true, awaitData: true});
assert.commandFailed(cmdRes);
// Create a capped collection with 10 documents.
coll.drop();
assert.commandWorked(db.createCollection(collName, {capped: true, size: 2048}));
for (var i = 0; i < 10; i++) {
assert.writeOK(coll.insert({a: i}));
}
// GetMore should succeed if query has awaitData but no maxTimeMS is supplied.
cmdRes = db.runCommand({find: collName, batchSize: 2, awaitData: true, tailable: true});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
assert.eq(cmdRes.cursor.firstBatch.length, 2);
cmdRes = db.runCommand({getMore: cmdRes.cursor.id, collection: collName});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
// Should also succeed if maxTimeMS is supplied on the original find.
cmdRes = db.runCommand({
find: collName,
batchSize: 2,
awaitData: true,
tailable: true,
maxTimeMS: 2000
});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
assert.eq(cmdRes.cursor.firstBatch.length, 2);
cmdRes = db.runCommand({getMore: cmdRes.cursor.id, collection: collName});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
// Check that we can set up a tailable cursor over the capped collection.
cmdRes = db.runCommand({find: collName, batchSize: 5, awaitData: true, tailable: true});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
assert.eq(cmdRes.cursor.firstBatch.length, 5);
// Check that tailing the capped collection with awaitData eventually ends up returning an empty
// batch after hitting the timeout.
cmdRes = db.runCommand({find: collName, batchSize: 2, awaitData: true, tailable: true});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
assert.eq(cmdRes.cursor.firstBatch.length, 2);
// Issue getMore until we get an empty batch of results.
cmdRes = db.runCommand({
getMore: cmdRes.cursor.id,
collection: coll.getName(),
batchSize: NumberInt(2),
maxTimeMS: 4000
});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
// Keep issuing getMore until we get an empty batch after the timeout expires.
while (cmdRes.cursor.nextBatch.length > 0) {
var now = new Date();
cmdRes = db.runCommand({
getMore: cmdRes.cursor.id,
collection: coll.getName(),
batchSize: NumberInt(2),
maxTimeMS: 4000
});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
}
assert.gte((new Date()) - now, 2000);
// Repeat the test, this time tailing the oplog rather than a user-created capped collection.
cmdRes = localDB.runCommand({
find: oplogColl.getName(),
batchSize: 2,
awaitData: true,
tailable: true
});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, oplogColl.getFullName());
assert.eq(cmdRes.cursor.firstBatch.length, 2);
cmdRes = localDB.runCommand({
getMore: cmdRes.cursor.id,
collection: oplogColl.getName(),
maxTimeMS: 1000
});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, oplogColl.getFullName());
while (cmdRes.cursor.nextBatch.length > 0) {
now = new Date();
cmdRes = localDB.runCommand({
getMore: cmdRes.cursor.id,
collection: oplogColl.getName(),
maxTimeMS: 4000
});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, oplogColl.getFullName());
}
assert.gte((new Date()) - now, 2000);
})();
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