Details
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Task
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Status: Closed
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Unknown
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Resolution: Done
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None
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None
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None
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2
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Not Needed
Description
NODE-4467 Description
What problem are you facing?
When trying to use a tailable cursor, it seems the flag `oplogReplay` is being ignore, based on `currentOp` command.
What driver and relevant dependency versions are you using?
No additional dependencies.
Steps to reproduce?
This is a complete example code. The same code can be used in different driver versions. When running this code using driver version 3.7.3 it works as expected, but starting from version 4.0 I can't see the oplogReplay option being applied which causes the query to take way longer.
const { MongoClient } = require('mongodb'); |
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(async function () { |
const client = new MongoClient('mongodb://localhost:27017', { |
maxPoolSize: 1,
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});
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await client.connect();
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const db = client.db('local'); |
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const _baseOplogSelector = {
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ns: new RegExp('^(?:rocketchat.)'), |
$or: [
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{ op: { $in: ['i', 'u', 'd'] } }, |
],
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};
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const lastEntry = await db.collection('oplog.rs').findOne(_baseOplogSelector, |
{projection: {ts: 1}, sort: {$natural: -1}});
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const cursor = db.collection('oplog.rs').find({ |
..._baseOplogSelector,
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ts: { '$gt' : lastEntry.ts } |
}, {
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tailable: true, |
awaitData: true, |
});
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cursor.addCursorFlag('oplogReplay', true); |
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console.log('get doc'); |
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const doc = await cursor.next();
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console.log('doc ->', doc); |
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client.close();
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})();
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I've attached two different results of db.currentOp(), when using driver version 3.7.3 and 4.0.1
Attachments
Issue Links
- is depended on by
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NODE-4467 Cursor option oplogReplay ignored starting from version 4.0
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- Closed
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