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// Test queries that set the OplogReplay flag.
// @tags: [requires_replication, requires_capped]
(function() {
"use strict";
load("jstests/libs/analyze_plan.js");
load("jstests/libs/storage_engine_utils.js");
function test(t) {
const isOplog = t.getName().startsWith("oplog.");
if (storageEngineIsWiredTigerOrInMemory() && isOplog) {
// We forbid dropping the oplog when using the WiredTiger or in-memory storage engines
// and so we can't drop the oplog here. Because Evergreen reuses nodes for testing,
// the oplog may already exist on the test node; in this case, trying to create the
// oplog once again would fail.
// To ensure we are working with a clean oplog (an oplog without entries), we resort
// to truncating the oplog instead.
if (!t.getDB().getCollectionNames().includes(t.getName())) {
t.getDB().createCollection(t.getName(), {capped: true, size: 16 * 1024});
}
t.runCommand('emptycapped');
t.getDB().adminCommand({replSetResizeOplog: 1, size: 16 * 1024});
} else {
t.drop();
assert.commandWorked(
t.getDB().createCollection(t.getName(), {capped: true, size: 16 * 1024}));
}
/**
* Helper function for making timestamps with the property that if i < j, then makeTS(i) <
* makeTS(j).
*/
function makeTS(i) {
return Timestamp(1000, i);
}
for (let i = 1; i <= 100; i++) {
assert.writeOK(t.insert({_id: i, ts: makeTS(i)}));
}
// Missing 'ts' field.
assert.throws(function() {
t.find().addOption(DBQuery.Option.oplogReplay).next();
});
assert.throws(function() {
t.find({_id: 3}).addOption(DBQuery.Option.oplogReplay).next();
});
// 'ts' field is not top-level.
assert.throws(function() {
t.find({$or: [{ts: {$gt: makeTS(3)}}, {foo: 3}]})
.addOption(DBQuery.Option.oplogReplay)
.next();
});
assert.throws(function() {
t.find({$nor: [{ts: {$gt: makeTS(4)}}, {foo: 4}]})
.addOption(DBQuery.Option.oplogReplay)
.next();
});
// There is no $eq, $gt or $gte predicate on 'ts'.
assert.throws(function() {
t.find({ts: {$lt: makeTS(4)}}).addOption(DBQuery.Option.oplogReplay).next();
});
assert.throws(function() {
t.find({ts: {$lt: makeTS(4)}, _id: 3}).addOption(DBQuery.Option.oplogReplay).next();
});
// A $gt query on just the 'ts' field should return the next document after the timestamp.
var cursor = t.find({ts: {$gt: makeTS(20)}}).addOption(DBQuery.Option.oplogReplay);
assert.eq(21, cursor.next()["_id"]);
assert.eq(22, cursor.next()["_id"]);
// A $gte query on the 'ts' field should include the timestamp.
cursor = t.find({ts: {$gte: makeTS(20)}}).addOption(DBQuery.Option.oplogReplay);
assert.eq(20, cursor.next()["_id"]);
assert.eq(21, cursor.next()["_id"]);
// An $eq query on the 'ts' field should return the single record with the timestamp.
cursor = t.find({ts: {$eq: makeTS(20)}}).addOption(DBQuery.Option.oplogReplay);
assert.eq(20, cursor.next()["_id"]);
assert(!cursor.hasNext());
// An AND with both a $gt and $lt query on the 'ts' field will correctly return results in
// the proper bounds.
cursor = t.find({
$and: [{ts: {$lt: makeTS(5)}}, {ts: {$gt: makeTS(1)}}]
}).addOption(DBQuery.Option.oplogReplay);
assert.eq(2, cursor.next()["_id"]);
assert.eq(3, cursor.next()["_id"]);
assert.eq(4, cursor.next()["_id"]);
assert(!cursor.hasNext());
// An AND with multiple predicates on the 'ts' field correctly returns results on the
// tightest range.
cursor = t.find({
$and: [
{ts: {$gte: makeTS(2)}},
{ts: {$gt: makeTS(3)}},
{ts: {$lte: makeTS(7)}},
{ts: {$lt: makeTS(7)}}
]
}).addOption(DBQuery.Option.oplogReplay);
assert.eq(4, cursor.next()["_id"]);
assert.eq(5, cursor.next()["_id"]);
assert.eq(6, cursor.next()["_id"]);
assert(!cursor.hasNext());
// An AND with an $eq predicate in conjunction with other bounds correctly returns one
// result.
cursor = t.find({
$and: [
{ts: {$gte: makeTS(1)}},
{ts: {$gt: makeTS(2)}},
{ts: {$eq: makeTS(5)}},
{ts: {$lte: makeTS(8)}},
{ts: {$lt: makeTS(8)}}
]
}).addOption(DBQuery.Option.oplogReplay);
assert.eq(5, cursor.next()["_id"]);
assert(!cursor.hasNext());
// An $eq query stops scanning after passing the max timestamp.
let res = t.find({ts: {$eq: makeTS(10)}})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 2, tojson(res));
let collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(10), collScanStage.maxTs, tojson(res));
// An AND with an $lt predicate stops scanning after passing the max timestamp.
res = t.find({$and: [{ts: {$gte: makeTS(1)}}, {ts: {$lt: makeTS(10)}}]})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 11, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(10), collScanStage.maxTs, tojson(res));
// An AND with an $lte predicate stops scanning after passing the max timestamp.
res = t.find({$and: [{ts: {$gte: makeTS(1)}}, {ts: {$lte: makeTS(10)}}]})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 12, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(10), collScanStage.maxTs, tojson(res));
// The max timestamp is respected even when the min timestamp is smaller than the lowest
// timestamp in the collection.
res = t.find({$and: [{ts: {$gte: makeTS(0)}}, {ts: {$lte: makeTS(10)}}]})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 12, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(10), collScanStage.maxTs, tojson(res));
// An AND with redundant $eq/$lt/$lte predicates stops scanning after passing the max
// timestamp.
res = t.find({
$and: [
{ts: {$gte: makeTS(0)}},
{ts: {$lte: makeTS(10)}},
{ts: {$eq: makeTS(5)}},
{ts: {$lt: makeTS(20)}}
]
})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 2, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(5), collScanStage.maxTs, tojson(res));
// An $eq query for a non-existent timestamp scans a single document.
res = t.find({ts: {$eq: makeTS(200)}})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 1, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(200), collScanStage.maxTs, tojson(res));
// When the filter matches the last document within the timestamp range, the collection scan
// examines at most one more document.
res = t.find({$and: [{ts: {$gte: makeTS(4)}}, {ts: {$lte: makeTS(8)}}, {_id: 8}]})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 6, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(8), collScanStage.maxTs, tojson(res));
// A query over both 'ts' and '_id' should only pay attention to the 'ts' field for finding
// the oplog start (SERVER-13566).
cursor = t.find({ts: {$gte: makeTS(20)}, _id: 25}).addOption(DBQuery.Option.oplogReplay);
assert.eq(25, cursor.next()["_id"]);
assert(!cursor.hasNext());
}
jsTestLog("Non-oplog.");
// Test that oplog replay on a non-oplog collection succeeds.
test(db.jstests_query_oplogreplay);
jsTestLog("Oplog.");
// Test that oplog replay on the actual oplog succeeds.
test(db.getSiblingDB("local").oplog.jstests_query_oplogreplay);
// Test that oplog replay on a non-capped collection fails.
const coll = db.jstests_query_oplogreplay;
coll.drop();
assert.commandWorked(coll.getDB().createCollection(coll.getName()));
assert.throws(function() {
coll.find({ts: {$gt: "abcd"}}).addOption(DBQuery.Option.oplogReplay).next();
});
}());
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