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// Test the awaitData flag for the find/getMore commands.
//
// @tags: [
// # This test attempts to perform a getMore command and find it using the currentOp command. The
// # former operation may be routed to a secondary in the replica set, whereas the latter must be
// # routed to the primary.
// assumes_read_preference_unchanged,
// requires_getmore,
// ]
(function() {
'use strict';
load("jstests/libs/fixture_helpers.js");
var cmdRes;
var cursorId;
var defaultBatchSize = 101;
var collName = 'await_data';
var coll = db[collName];
// 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);
// With a non-existent collection, should succeed but return no data and a closed cursor.
coll.drop();
cmdRes = assert.commandWorked(db.runCommand({find: collName, tailable: true}));
assert.eq(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.firstBatch.length, 0);
// Create a capped collection with 10 documents.
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.
// The oplog tailing in not possible on mongos.
if (FixtureHelpers.isReplSet(db)) {
var localDB = db.getSiblingDB("local");
var oplogColl = localDB.oplog.$main;
cmdRes = localDB.runCommand(
{find: oplogColl.getName(), batchSize: 2, awaitData: true, tailable: true});
assert.commandWorked(cmdRes);
if (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);
}
}
// Test filtered inserts while writing to a capped collection.
// Find with a filter which doesn't match any documents in the collection.
cmdRes = assert.commandWorked(db.runCommand({
find: collName,
batchSize: 2,
filter: {x: 1},
awaitData: true,
tailable: true,
comment: "uniquifier_comment"
}));
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
assert.eq(cmdRes.cursor.firstBatch.length, 0);
// getMore should time out if we insert a non-matching document.
let insertshell = startParallelShell(function() {
assert.soon(
function() {
return db.currentOp({
op: "getmore",
"command.collection": "await_data",
"originatingCommand.comment": "uniquifier_comment"
}).inprog.length == 1;
},
function() {
return tojson(db.currentOp().inprog);
});
assert.writeOK(db.await_data.insert({x: 0}));
});
now = new Date();
cmdRes = db.runCommand({getMore: cmdRes.cursor.id, collection: collName, maxTimeMS: 4000});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
assert.eq(cmdRes.cursor.nextBatch.length, 0);
assert.gte((new Date()) - now,
// SERVER-31502 Add some leniency here since our server-side wait may be woken up
// spuriously.
3900,
"Insert not matching filter caused awaitData getMore to return prematurely.");
insertshell();
// getMore should succeed if we insert a non-matching document followed by a matching one.
insertshell = startParallelShell(function() {
assert.writeOK(db.await_data.insert({x: 0}));
assert.writeOK(db.await_data.insert({_id: "match", x: 1}));
jsTestLog("Written");
});
cmdRes =
db.runCommand({getMore: cmdRes.cursor.id, collection: collName, maxTimeMS: 5 * 60 * 1000});
assert.commandWorked(cmdRes);
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
assert.eq(cmdRes.cursor.nextBatch.length, 1);
assert.docEq(cmdRes.cursor.nextBatch[0], {_id: "match", x: 1});
insertshell();
})();
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