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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_capped,
// requires_getmore,
// uses_multiple_connections,
// uses_parallel_shell,
// ]
(function() {
'use strict';
load("jstests/libs/fixture_helpers.js");
load('jstests/libs/discover_topology.js'); // For Topology and DiscoverTopology.
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.commandWorked(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.commandWorked(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.
const sixtyMinutes = 60 * 60 * 1000;
cmdRes = db.runCommand(
{find: collName, batchSize: 2, awaitData: true, tailable: true, maxTimeMS: sixtyMinutes});
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.rs;
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);
}
}
let originalCmdLogLevel = assert.commandWorked(db.setLogLevel(5, 'command')).was.command.verbosity;
let originalQueryLogLevel = assert.commandWorked(db.setLogLevel(5, 'query')).was.query.verbosity;
try {
// 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);
// The code below will test for the tailable, awaitData cursor being awaken once a matching
// document is inserted and expects the document to be returned in the next batch. However, the
// logic without waiting for the timeout in order to receive the data only works if the read
// concern is not set to majority. The reason for this is that the primary node will notify the
// waiting cursor on document being inserted on its node and not on the majority of nodes.
// However, since the read concern is set to majority, the awaken cursor won't find the newly
// inserted document, as at that time it is present on the primary only. Therefore it will be
// waiting till the timeout. In order to avoid the waiting we stop running this test if read
// concern majority.
const topology = DiscoverTopology.findConnectedNodes(db.getMongo());
if (topology.type !== Topology.kStandalone) {
const readConcern =
assert.commandWorked(db.adminCommand({getDefaultRWConcern: 1})).defaultReadConcern;
if (readConcern.level == "majority" || TestData.defaultReadConcernLevel === "majority") {
return;
}
}
// Test that a getMore command on a tailable, awaitData cursor does not return a new batch to
// the user if a document was inserted, but it did not match the filter.
let insertshell = startParallelShell(() => {
// Signal to the original shell that the parallel shell has successfully started.
assert.commandWorked(db.await_data.insert({_id: "signal parent shell"}));
// Wait for the parent shell to start watching for the next document.
jsTestLog("Checking getMore is being blocked...");
assert.soon(() => db.currentOp({
op: "getmore",
"cursor.originatingCommand.comment": "uniquifier_comment"
}).inprog.length == 1,
() => tojson(db.currentOp().inprog));
// Now write a non-matching document to the collection.
assert.commandWorked(db.await_data.insert({_id: "no match", x: 0}));
// Make sure the getMore has not ended after a while.
sleep(2000);
jsTestLog("Checking getMore is still being blocked...");
assert.eq(
db.currentOp({op: "getmore", "cursor.originatingCommand.comment": "uniquifier_comment"})
.inprog.length,
1,
tojson(db.currentOp().inprog));
// Now write a matching document to wake it up.
jsTestLog("Sending signal to getMore...");
assert.commandWorked(db.await_data.insert({_id: "match", x: 1}));
jsTestLog("Insertion shell finished successfully.");
});
// Wait until we receive confirmation that the parallel shell has started.
assert.soon(() => db.await_data.findOne({_id: "signal parent shell"}) !== null);
// Now issue a getMore which will match the parallel shell's currentOp filter, signalling it to
// write a non-matching document into the collection. Confirm that we do not receive this
// document and that we subsequently time out.
cmdRes = db.runCommand({
getMore: cmdRes.cursor.id,
collection: collName,
maxTimeMS: ReplSetTest.kDefaultTimeoutMS
});
assert.commandWorked(cmdRes);
jsTestLog("Waiting insertion shell to terminate...");
assert.eq(insertshell(), 0);
jsTestLog("Insertion shell terminated.");
assert.gt(cmdRes.cursor.id, NumberLong(0));
assert.eq(cmdRes.cursor.ns, coll.getFullName());
assert.eq(cmdRes.cursor.nextBatch.length,
1,
'Collection documents: ' + tojson(db.await_data.find({}).toArray()));
assert.docEq(cmdRes.cursor.nextBatch[0], {_id: "match", x: 1});
} finally {
db.setLogLevel(originalCmdLogLevel, 'command');
db.setLogLevel(originalQueryLogLevel, 'query');
}
})();
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