Mongoose cursor timeout batchSize() of the find(). 19, I will give it a try. Actually, all queries have a timeout by default. My research indicates that the cursor may be timing out but not sure how that is possible considering the operations are pretty quick. will see if the new logs show anything The object you receive is a Cursor which is an object used to retrieve the actual results. So either operations are taking a really long time or simply are not notifying completion and closing cursors. This is of course done using the timer API. Mongoose is a powerful ODM library for MongoDB and Node. 1 Tailable cursor closing when reaching end of collection. This one is pretty short (around 5s) and very reproducible but other queries take longer than 5s and do not time out I hear that it happens coz the cursor timeout but I don't think this is true coz it is the only collection running I dont see a reason why the cursor should time out. You can always retry if time is not long enough for your application. cursor). js + mongoose [RangeError: Maximum call stack size exceeded] mongo cursor timeout. 7. I tried both: let cursor = Startup. I didn't find any solution to get the cursor object and set the noTimeout property to false via addCursorFlag method of the cursor of the native mongodb driver. const paginate = require ( 'mongoose-cursor-paginate' ) ; const PostSchema = new mongoose . MongoDB Aggregation Cursors don't have a mechanism to adjust Batch Size or set Cursor Timeouts. This request returns a stream (use of mongoose cursor function). 20, Node 6. MongooseJS, a popular MongoDB object modeling tool for Node. Does it mean that it is infinite by default? mongoose update not calling back instantly. Since the session will never exceed the 30 minute idle timeout, the cursor I had the same issue when using Mongoose 6. All of the extra timeout options, etc you see are part of my attempts to fix this problem (to no avail). The noCursorTimeout() method has the following prototype form: db. mongoose connection connectTimeoutMS. Mongoose cursor times out after a couple of hours even though noCursorTimeout flag is set. Reload to refresh your session. js applications. You might even have the pleasure of removing a few dependencies from your package. Karry Cui Karry Cui. Mongoose models provide several static helper functions for CRUD operations. dataset). alive is still available at cursor level, however, it only provides meaningful information for a tailable cursor I am using mongodb's (mongoose module) with node js and i am processing around 1,00,00,000 documents in (1000 bunch each) using limit and skip functionalities. json if you start using async/await instead of co. It is analogous to QueryCursor. Otherwise, the default Mongoose cursors; Streams and promises; Share. 1483 ms in your comment), unless I'm not remembering correctly how to interpret those results. I was thinking mongoose requires the same. . Can you expose the underlying cursor object? Something like Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I had the same issue when using Mongoose 6. Can someone tell me how can I set this parameter up in Node. JS? 60000, socketTimeoutMS: 60000, } } } Mongoose. 6. 👎 Query the results in batches manually. Does mongoose include a timeout on each query? Neither mongoose nor the driver sets a cursor timeout, so cursors get killed after 10 minutes by default. find (< query > ). Are you keeping a cursor open for that long? paton commented Jun 29, 2015. noCursorTimeout() method is suitable for query scenarios that need to handle large amounts of data, such as batch data processing or importing. – Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This is a wrong interpretation of the usage of "batchSize". 19. find(). cursor has no method next. write is invoked, they might not be exactly what you want. collection. However, since use cases differ, other paradigms offer different access patterns, like pulling all matching documents into a collection in process memory. Each of these functions returns a mongoose Query object. I use data from client to run a mongoDB query 3. You can see only a few lines above that you can disable the timeout by passing the noTimeout option on the cursor query. Are you keeping a cursor open for that long? Timeout is false by default, so to disable timeout you need to set { timeout: true }. var batch_size = 1000; cursor. I'm using mLab, its a cloud mongodb service. Not super happy with this solution but for testing it is good enough. The code look like this . Improve this answer. Rather, it's usually better to set a really high timeout value instead. The cursor timout is checked here. So even a cursor with noCursorTimeout set will still time out after 30 minutes of inactivity. Follow answered Nov 25, 2016 at 12:43. – matt. deleteOne() Model. – I am trying to run an aggregation on a big collection using Mongo Java Driver 3. collection . By now, most popular Node. feature. Help Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company You need to provide cursor option for aggregate calls which is changed in Mongo 3. I've only ever had mongoose timeout if the node process gets interupted via my computer going to sleep. To do the same in Mongoose, you need to access the raw collection object for your model: 👍 Reducing the batch size to keep the cursor alive. The maxTimeMS option lets you specify a query timeout at the operation level, meaning you can specify different time limits for Understanding the Mongoose Error The ‘Mongoose buffering timed out’ error typically occurs when Mongoose, a MongoDB object modeling tool for Node. I get data from client 2. To make MongoDB database manipulation easy, we can use the Mongoose NPM package to make working with MongoDB databases easier. Cursor timeout #252. In MongoDB, this functionality is provided with TTL (Time To Live) indexes, which can be utilized in Mongoose, a popular MongoDB object modeling tool for Node. 9k 12 12 gold badges 108 108 silver badges 85 85 bronze badges. Provide details and share your research! But avoid . How does it behave when you use This includes cursors configured with noCursorTimeout() or a maxTimeMS() greater than 30 minutes. Depending on the reply from client, I filter the cursor (the results from the first mongoDB query) – Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company For me not even no_cursor_timeout=True worked, so I created a function that saves the data from the cursor in a temporary file and than yields the documents back to the caller from the file. collection('Tweet'). Commented Mar 24, 2018 at 18:21 @Jackpile die you find a solution? I have the same problem – ThommyH. data. For example, say you are using the date field for pagination, then you would want to setup the A mongoose query can be executed in one of two ways. Otherwise, the caller is responsible Set a maxAwaitTimeMS on a tailing cursor query to allow to customize the timeout value for the option awaitData (Only supported on MongoDB 3. However, the cursor did not timeout even when I slept for 15 By default, inactive cursors expire after 10 minutes, this option makes it possible to configure this timeout. For example, consider a find() operation with the maxTimeMS() configured for a timeout of 31 minutes. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company number of open cursors with the option DBQuery. mongodb node cursor not found with timeout false. Follow edited Jun 29, 2020 at 19:17. 0. skip( ): The cursor. TCP-based protocols will timeout depending on your TCP/IP stack implementation, triggering an MG_EV_ERROR event. The cursor is configured with cursor. But when your query can I am running a query on a very large collection (500m documents) which is timing out sometimes (6 minutes) or takes very long (3-6 minutes). By default, if maxTimeMS is set on the command that created the cursor, then the timeout for awaitData is the remaining time. Mongoose provides the limit() and skip() methods for this The default timeout isn't set by mongoengine so it falls back to the mongodb cursor timeout which is 10 minutes (see doc) There is no specific support for it in mongoengine but mongodb seems to offer that feature with the cursorTimeoutMillis parameter (see doc). findOne(which will return just that object without the additional layer of indirection. , connect timeout should be done manually; but we can take advantage of Mongoose's architecture. Use Cases. Optional override for formatting stack traces. Looks like what was happenning is that the cursor was timing out. What I want to do is iterate over a collection, without loading all 1000+ found items into memory at once (instead one by one), and call some API for each found element and update My best guess is that there's a timeout somewhere that's causing the underlying socket to close, perhaps due to an OS-level timeout on the socket if there wasn't any activity for a while. You switched accounts on another tab or window. I have put in the SDAM and connection level monitoring and will see what i find. 2. We call the addCursorFlag to disable the cursor timeout. Hang up the http connection after some mongodb@2. Usually this is avoided by a timeout that disables the query after a while. This way, the MongoDB client (in this case, PyMongo) will have to query the server once in a while whenever the documents in the previous batch were used up. mongo cursor timeout. findOne() buffering timed out after 10000ms occurs when a Mongoose operation in a NodeJS + Mongoose timeout on connection. You can use several different cursor paradigms to access data. Related questions. the mongo server config error: cursor timeout; check out article. 0 + "callback approach", I had to do: mongo cursor timeout. The only way to recover is to restart the server. Closed I'm a little confused here about the results that you're showing both here and in your comment on the existing answer, as both of those queries appear to have completed in under two seconds (1514 ms in your question, . On small samples of my collection everything works great, but when I tried to execute it on the whole collection I ended up with MongoCursorNotFoundException. I am using cursor in mongo to iterate over 200k+ documents. – Jackpile. The cursor will also be auto-closed if the cursor object is garbage collected by Python. Mongoose cursors are a powerful feature that allows developers to iterate over large data sets without loading all documents into memory at once. pageInfo will have two properties: hasNext and nextCursor. Be sure to index correctly. connect(process. This cursor can be used to retrieve documents one by one or in batches, saving memory and improving It is important to keep the event manager polling timeout smaller than the timer interval, because timers are checked at every polling cycle. x according to the documentation, so I'll keep digging into this. MongoDb nodejs In a nodeJs application I'm using a for await loop to iterate a Mongoose cursor inside an async function. Since the session will never exceed the 30 minute idle timeout, the cursor According to the changelog. createIndex({ fieldName: 1 }); By creating an index on ‘fieldName’, you accelerate queries that use this field, thereby reducing the likelihood of timeouts. js libraries support some sort of promise-based API, so they integrate nicely with async/await. 11. connect( process. When using a cursor, you can also provide it a maxTimeMS option to increase/decrease the timeout on the aggregate operation. This will not scale. I am polling with around 6k requests so the stream needs to be open for mor To return query as a cursor, you must add the cursor option in the options. If you read the fine print on cursor. MongoDb nodejs connectTimeoutMS. By specifing the cursorTimeoutMillis option, administrators can configure mongod or Using a delay of 40 seconds causes the script to throw an error after some time. I would try to explicitly set these headers before sending out You signed in with another tab or window. 13. js/Mongoose?). model(job. The cursor returns no data only if the timeout expires. Mongoose time out (solved) edit: verifying file integrity under game properties found 14 missing files and solved this issue for me. 0 Aggregate pipleline Error: getMore: cursor didn't exist on server, possible restart or timeout mongoose; or ask your own question. i reduced the size of my bulk writes but that doesn’t seem to have had any impact on this. cursor. 👎 Get all the documents before the cursor expires. Copy link wibiaris commented Jul 14, 2014. However, cursors can still time out because of session idle timeouts. I am aware that the default timeout is 10min, but strange is, on one cluster it is working fine and on another identical cluster it is givin Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. For example here we are setting the expires to 2m (2 minutes) and mongoose would convert to 120 seconds for us:. You signed in with another tab or window. Follow answered Dec 15, 2020 at 2:06. serverStatus() method and accesses the metrics field from the results and then the cursor field from the metrics field: The object you receive is a Cursor which is an object used to retrieve the actual results. Introduction Diving into the world of MongoDB with Mongoose as our ODM (Object Document Mapping) tool, we realize that handling large amounts of data efficiently is crucial. An AggregationCursor fulfills the Node. I am trying to use a Mongoose cursor iterate through a Mongo database hosted in Atlas. You signed out in another tab or window. js. _onTimeout" comes whenever your above things are not matched with your server configuration. I have written a small node program using Mongoose to iterate over collection using a cursor. I indexed all the relevant fields (no compound index): Tag, trophies, battleLogMonitorFrequency, profileRefreshedAt are indexed and the totalIndexSize is lower than 60% of my memory (45gb indexsize of 153gb which are Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company command_cursor – Tools for iterating over MongoDB command results; cursor – Tools for iterating over MongoDB query results; database – Database level operations; This timeout applies to all of the work done to execute the operation, including but not limited to server selection, connection checkout, serialization, and server-side Try setting the cursor timeout globally via cursorTimeoutMillis parameter. It is minimal but can become a problem if the number of open cursors grows into the hundreds or thousands. err: Error; stackTraces: CallSite []; Returns any results will be the results that you would expect from a normal mongoose find query. 2 RangeError: Maximum call stack size exceeded with mongoose One caveat is if your application crashes, or was forcibly stopped by Lambda, this cursor will live forever in the server, similar to a memory leak. Follow answered Jun 10, 2021 at 0:42. For other protocols, application control, shorter times, etc. cursor() In the example operation, the db. However, after 10 minutes the underlying cursor is closed docs. js ODM library for interfacing with MongoDB. Hot Network Questions How was the tropical year determined for the Gregorian calendar? In SRP, why must the client send the A number before the server sends the B number? Mostly "Server selection timed out after 30000 ms at Timeout. aggregate(query, {cursor: {batchSize:100}}, writeResultsToCsv); You signed in with another tab or window. 1. The session refreshes each time the The only timeout that can be specified is one which informs the server to timeout the cursor after 10 minutes of inactivity, however as in the scenario above the connection to the server is down this does not work. However I noticed that it's pretty slow (it takes more than 40 minutes). Note that this plugin always add _id to the sort key to ensure cursors are unique, so include that in your index as well. Just dies. log('Connected to MongoDB'); } ); I found the following info for Mongoose 6 in their site: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Understanding the Mongoose Timeout Error The error MongooseError: Operation users. 17 updated to mongodb-core@2. find({},{timeout: false}). populate: an array representing what paths will be populated. 19 Node. Ask Question Asked 4 months ago. Here, cursor is the query cursor object. batchSize(batch_size). total number of open cursors. js streams3 API, in addition to several other mechanisms for loading documents from MongoDB one at a time. 3 which includes a fix for monitoring operations timing out and generating a timeout event on running operations @1284917. find(timeout=False) which I found in below links, StackOveflowLink1. deleteMany() Model. 5,436 1 1 gold I am receiving a FInd Cursor object instead of expected - MongoDB Loading In the example operation, the db. noTimeout); The reason is that for each streamed / 1-cursor document created. Setting timeout parameter makes cursor open for unlimited time, which will affect system performance. noCursorTimeout() to prevent the server from closing the cursor if idle. I get a reply from client 6. _onTimeout (D:\nestJS\elit-it-backend\node_modules\mongoose\node_modules\mongodb\lib\change_stream. Since the session will never exceed the 30 minute idle timeout, the cursor Providing a string to expires also works nicely with Mongoose if you do not want to deal with the expire time calculation and improve the overall readability of the schema. StacKOverflowLink2. We can call aggregate to do aggregation with the results. However, the documented function addCursorFlag doesn't work. It seems to timeout randomly. i dont know which clause should make it timeout, though. Define your mongoose schema and plug the mongoose-cursor-paginate module. Something like this: let count = 0 const movies = Movies. The example code in the Mongoose repository uses WebSocket to send a small periodic message to every connected client. You do that from the client side when opening the cursor: var cursor = t. NodeJS MongoDB avoid Cursor Timeout. 12. How do I set a timeout on a Mongoose query? 0. You can configure the timeout period using a initializer, like this One great perk of async/await in Node. How do I set a timeout on a Mongoose query? 1. Mongoose versions prior to 5. 22. 2 or higher, ignored otherwise) Name Type Using an other framework for mongodb, I used to disable the timeout for the queries. Asking for help, clarification, or responding to other answers. connect(): The NoCursorTimeout bit in the OP_QUERY header prevents the server from closing a cursor that's idle for more than 10 minutes. All that means ( and essentially as a parameter to the the cursor return of . iterating over a Mongo Cursor with finite batch size. Hi, How can implement/adjust the cursor time out? Mongo Tailable Cursor { Error: No More Documents in Tailed Cursor } Hot Network Questions Finding nice relations for an explicit matrix group and showing that it is isomorphic to the symmetric group Documentation says that such timeout could only be specified for a cursor via cursor. Cursor times out even with `noCursorTimeout` set to true. I get the results from mongoDB (cursor) 4. number of open cursors with the option DBQuery. Since MongoDB in the I set the ‘cursorTimeoutMillis’ to 20 seconds and expected the cursor to timeout if I sleep for more than 20 seconds. each(function (err, document) { To specify a time limit for a query, perform one of these actions: Specify the maxTimeMS() option for a query. I need to iterate over a full MongoDb collection with ~2 million documents. Instructs the server to avoid closing a cursor automatically after a period of inactivity. 👍 Remove the timeout from the cursor. @virattara, the code used is directly under step 3 in each scenario. Ask Question Asked 12 years, 7 months ago. Harshana Harshana. Parameters. 9 and mongodb@2. Schema({ name: String, createdAt: { type: There is an option to set a timeout for particular query (i. also, i set the noCursorTimeout flag. Handling subdocuments effectively is critical for achieving complex data Mongoose models provide several static helper functions for CRUD operations. When querying a MongoDB collection with Mongoose, a cursor is returned instead of the actual data. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Providing a string to expires also works nicely with Mongoose if you do not want to deal with the expire time calculation and improve the overall readability of the schema. skip() method is often expensive because it requires the server to walk from the beginning of the collection or index to get the offset or skip position before beginning to return result. There are a lot of other great solutions on here, thanks for posting them! so they're easy to find here are some successful solutions other users have posted: Thanks for the responses! I had done an 'npm update mongoose' previously, but went back and did it again and realized the response I'm getting is: trunk\node_modules>npm update mongoose [email protected] mongoose └── [email protected] I should be getting to version 5. js:497:7) Emitted 'error' event on ChangeStream instance at: at ChangeStream. Mongodb timeout while using for loop. function findQuotes(from, to) { c Hello, I am getting cursorTimeout error, so I increased cursorTimeoutMillis . If no document is found, it returns null. 3. addOption(DBQuery. 000 My assumption is that there is a timeout parameter with the value of 30 seconds that blocks my application from finish the query. Can anybody help me with cursor close connection. noTimeout set to prevent timeout after a period of inactivity. James Z. cursor({batchSize: 100}). First, if you pass in a callback function, However, cursors can still time out because of session idle timeouts. 6, Mongoose 4. log(count); I am wondering if this could be a timeout issue of the cursor. 5). write. Schedule Issue Undo Transition. @Neodan For something like this (with 100 simultaneous clients): 1. Mongo cursor with node driver. maxTimeMS is a Mongo shell method which is different from Node. I connected to Mongoose in my index. number of "pinned" open cursors. Its default timeout value is 10 minutes. Aggregation. Option. Clients can set this bit if they may spend more than 10 minutes processing a batch of results. Share. But when the db crashes it should be possible to send a message to the user. The while loop includes a block that uses refreshSessions to refresh the session every 5 minutes. find() So even a cursor with noCursorTimeout set will still time out after 30 minutes of inactivity. After quite a bit of time, I start getting a Mongo Error: Cursor ID not found. Consider the following example which calls the db. You are missing the concept of a "cursor". If you look at the doc however, while the headers are implicitly set the first time response. js:475:23) at listOnTimeout (internal/timers. Timeouts are really weird. lean(). Soon Mongoose updates to mongodb@2. Can you add the mongoose connect code, the options you have set. For example, say you are using the date field for pagination, then you would want to setup the MongoError: Timed out waiting for connection at Timeout. js, attempts to Overview Mongoose is a widely used Object Data Modeling (ODM) library for MongoDB and Node. Follow mongo cursor timeout. Documented here. env. I've only ever seen it happen twice but if I go to production and it happens that would be a nightmare lol. Commented Jul 7, 2016 at 20:09. Wtower Wtower. 2. populate(); lean: if truthy, Mongoose will not hydrate any documents that are returned from this query. Having the same problem with mongoose@4. Getter/setter around the current mongoose-specific options for this query Below are the current Mongoose-specific options. <anonymous> (D:\nestJS\elit-it I'm am very disappointed by the accepted answers in this question. The "aggregate" and "parallelCollectionScan" commands should allow the client to turn off cursor timeouts, too. Mongoose send 1 query to MongoDB via its Driver. retry is already on. In this article, we’ll look at how to use Mongoose to manipulate our MongoDB database. Therefore I am using the cursor feature and the eachAsync function. js (though both of them are javascript based). 5,436 1 1 gold badge 19 19 silver badges 30 30 bronze badges. The code is fixed in recent mongoose releases. Schema ( { title : String , date : Date , body : String , author : { type : mongoose . js is how well it integrates with existing libraries. Take a look here. This works perfectly find for an undetermined amount of time and then all of the sudden The cursor is configured with cursor. Weird API, I know. Improve this question. 8. Viewed 4k times 3 So I've read that mongoose driver for NodeJS caches queries until it connects to MongoDB (no timeouts). 35 Mongoose - RangeError: Maximum Call Stack Size Exceeded. It may be a good idea for you to consider using MongoDB's aggregation pipeline for simplifying the processing of large data sets. One sharded collection with about 300. lean() for more Sets the cursor to block the query thread when no data is available and await data for a set time instead of immediately returning no data. In your terminal, type: $ mongod --setParameter cursorTimeoutMillis=600000 Share. 0. In this tutorial, we will delve into the use Though not directly a timeout setting, using indexes can significantly decrease query execution time, indirectly addressing timeout issues by improving efficiency: db. Mongoose provides several To solve this problem, we have four approaches: Modify the MongoDB configuration, extend the cursor timeout period, and restart MongoDB. The server returns a cursor along with a batch of documents defined by the cursor. The while loop includes a block that uses refreshSessions to refresh the session In this tutorial, we will explore how to set timeouts in Mongoose, guaranteeing more robustness and stability inside your Node. MongoDB's own node driver allows you to make the aggregate method use a cursor (it does not do this by default). The buffering timeout is usually due to either registering models on a newly created connection but using mongoose. I don't know if socketTimeoutMS should apply to cursors, even when noCursorTimeout is set to Neither mongoose nor the driver sets a cursor timeout, so cursors get killed after 10 minutes by default. addOption(), but I was unable to find a way to specify a timeout for write queries. rst for the PyMongo driver, the alive method is deprecated on MongoClient since it no longer provides meaningful information. But honestly, I don't think we'll be able to make any progress with this issue without being able to consistently reproduce it. toArray}, the cursor will only hold a maximum of batch size elements at any given time if batch size is specified. mongoose; cursor; Share. Closed wibiaris opened this issue Jul 14, 2014 · 5 comments Closed Cursor timeout #252. Otherwise, the default Introduction. js driver only supports the batchSize setting. When you are sure your query will never return more than one object (like in this case where you query by the always unique _id field), you can use db. As a software developer, you may often find yourself working with large data sets that need to be processed thanks. js:554:17) at processTimers (internal/timers. 4. One of its fundamental database query functions is findOne(), which retrieves a single document from the database matching the given criteria. aggregate(pipeline). Use the close method of the cursor object. MONGO_URI,optionsMongoose); but after some time all the request to MongoDB will start getting timed out. This is one reason why it's not usually recommended to have a notimeout cursor. 👍 Retry when the cursor expires. serverStatus() method and accesses the metrics field from the results and then the cursor field from the metrics field: { [MongoError: cursor killed or timed out] name: 'MongoError', message: 'cursor killed or timed out' } I am using the following code to poll the google doc results will be the results that you would expect from a normal mongoose find query. prototype. var TestSchema = new mongoose. The purpose of findOne() is to find the first document that matches the specified query criteria. It has about 1800 documents and is hosted in Atlas. See Query. Imagine that the data from your query are consumed in days, so the cursor is kept open for days. If the query involves a large number of documents and the query time exceeds the default timeout time of the cursor (10 minutes), the cursor will timeout and close, causing the There is no timeout for res. The Overflow Blog The ghost jobs haunting your career search Mongoose models provide several static helper functions for CRUD operations. Model. If you use a replica set, you can even set a readPreference to direct your large aggregation queries to secondary nodes, ensuring that In the example operation, the db. Follow the Build Tools tutorial to Remember that, in Mongoose, every model has exactly one connection to MongoDB. You would set the batchOption like this: var cursor = coll. e. js that provides a higher level of abstraction, making database interactions easier and more secure. But, the timeout setting for the aggregation cursor is (currently) not supported. Even if the Mongo Client is disconnected, it may discover a server in time to fulfill the next operation. If you have a sizable list of Mongo Aggregation Framework with Mongoose raising Document Limit exception on simple Projection. – line-segment. Mongoose/MongoDB batchSize(30) still Cursor-based iteration with Mongoose Published November 17, 2021 ・ Last updated December 16, 2024 ・ 1 min read Using cursor-based iteration can be useful when there is a need to iterate (in memory) over all of the documents I'm trying to make an aggregate query on a Model with the noCursorTimeout option. { [MongoError: cursor killed or timed out] name: 'MongoError', message: 'cursor killed or timed out' } I am using the following code to poll the google docs API. There are also next() and forEach() methods, but those seem to be available only in MongoDB shell, not in Mongoose (or can I create a cursor in Node. it happens when i’m doing very long runs (> 30 minutes), although i do a lot of reads and writes throughout that period. 1. Good Morning, I'm making a database request to my MongoDB through Mongoose ODM in javascript. 11. also, i dont think it is a document that is larger to process, which would go above the max idle time, because if i skip {cursor. find({}). js that provides a straightforward, schema-based solution to model your application’s data. Commented Feb 11, 2017 at 15:42. Since the session will never exceed the 30 minute idle timeout, the cursor Do you want to request a feature or report a bug? Bug What is the current behavior? Hy all, I ran into a very weird issue, I have a 2 shards replica set mongodb cluster (latest 3. find() method is associated with an explicit session. Therefore there is no direct way to alter this and the timeout of an aggregation query solely depends on the cursorTimeoutMillis parameter of the MongoDB or mongos` instance. Solution was setting the find() query to {timeout:false} like the following: mongoose. 6, which now expects a cursor. Modified 10 years, 10 months ago. Hot Network Questions Home Articles Developers FAQ Mongoose developers questions Handling Large Data Sets with Mongoose Cursors. Mongoose is a popular Node. mongoose. x call a "legacy" mode of aggregate to return as a single BSON document, which is not compatible with the "default" action in MongoDB 3. In my DB monitoring tool, I can see that the In applications involving time-sensitive data, having a mechanism to automatically expire and remove documents can be incredibly useful. The Overflow Blog “Data is the key”: Twilio’s Head of R&D on the need for good data A better way to get rid of the cursor id timeout exception is to estimate how many documents your loop can process within 10 minutes, and come up with an conservative batch size. Mongodb slow update loop. NodeJS + Mongoose timeout on connection. But when your query can Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The process function can took more then 10 minutes to finish. Not a cursor timeout since I'm using it constantly. wibiaris opened this issue Jul 14, 2014 · 5 comments Labels. Schema({ name: String, createdAt: { type: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company My test runner (AVA) creates a new database for every test file but it seems it needs some time to settle now and adding await timeout(1000) after the mongoose. Since the session will never exceed the 30 minute idle timeout, the cursor Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company With the above in mind, it's possible that your data set could grow to be quite large and difficult to work with. game is running great. You can set a no_timeout option to tell the query to never timeout. connect(url, { maxIdleTimeMS: 80000, serverSelectionTimeoutMS: 80000, socketTimeoutMS: 0, connectTimeoutMS: 0 } I am receiving a FInd Cursor object instead of expected - MongoDB Loading Sets the cursor to block the query thread when no data is available and await data for a set time instead of immediately returning no data. exec(); cursor The solutions to this problem is setting timeout paramter mongo_collection. js file the following way: mongoose. Hard to tell without the code, but exactly why you should be looking at the server logs for the number of active connections . What scenario might result in an open cursor? Does mongoose return a cursor for any operations? I was under the impression that the cursor was abstracted away An AggregationCursor is a concurrency primitive for processing aggregation results one document at a time. MongoDB and PHP Library Cursor Timeout. So we use batchSize along with cursor, for example How to process documents in batch while not timing out on node mongodb cursor. I found out it is a problem of the Cursor that times out and gets closed by the server. connect the problem went away. 4. Should have one entry for each call to Query. Most cursor paradigms allow you to access query results one document at a time, abstracting away network and caching logic. Published on 10 October 2024 by Cătălina Mărcuță & MoldStud Research Team Handling Large Data Sets with Mongoose Cursors. MONGO_URL, { useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex: true }, () => { console. connect(url, options); Share. find(), despite the driver method ) is that that server will return a "batch" of 100 results ( in this case ) at a time, which is then to be iterated as a "cursor". const optionsMongoose = { poolSize: 10, bufferMaxEntries: 0, connectTimeoutMS: 10000, socketTimeoutMS: 45000, family: 4 }; mongoose. The cost of having open cursors is the memory required on the server for the cursor. from tempfile import NamedTemporaryFile import pickle import os def safely_read_from_cursor(cursor): # save data in a local file with NamedTemporaryFile Introduction When building applications with large datasets, effective pagination strategies become crucial for performance and user experience. Note they are not numbered following any specific criteria. 3k 10 10 NodeJS MongoDB avoid Cursor Timeout. Comments. Upgrade Mongoose. cursor(); for await (const movie of movies) { count++ } console. Try setting the cursor timeout globally via cursorTimeoutMillis parameter. I have tried In the example operation, the db. 2 Iterate over Mongodb cursor from aggregate. With Mongoose 3. This is not a MongoDB issue it's a "mongoose" issue. The native node. Add a comment | Your Answer mongoose; or ask your own question. Mongo shell query timing out at 90 seconds. I ask a question to client 5. js, supports cursor-based Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog In the example operation, the db. log('Connected to MongoDB'); } ); I found the following info for Mongoose 6 in their site: I am receiving a FInd Cursor object instead of expected - MongoDB Loading The object you receive is a Cursor which is an object used to retrieve the actual results.