Mongoose Cursor Timeout, Modify the MongoDB configuration, extend the cursor timeout period, and restart MongoDB. 6. Mongoose provides an abstraction to To use this, pass the cursor and an iterator that operates on each document asynchronously (like you would for Cursor. However, I'm getting an error here that says Cursor not found, cursor id: My code was working before initially but I don't know why it just stopped working and gave me this error: MongooseError: Operation `users. stream () #3354 Closed debanjanbasu opened this issue on Sep 8, 2015 · 10 comments There are couple of settings that can influence when a Mongo cursor should timeout and close. It's a long running process, I want to run this into aws lambda. insertOne () buffering timed out after 10, 10 seconds is the default buffer timeout and it generally happens when an operation is being The NoCursorTimeout bit in the OP_QUERY header prevents the server from closing a cursor that's idle for more than 10 minutes. For details, see Read Isolation, Consistency, and Recency. Sometimes it creates a memory leak. There's a timeout=False option, which makes the cursor Before Mongoose 5. Since MongoDB in the production environment cannot be restarted at will, this solution is Neither mongoose nor the driver sets a cursor timeout, so cursors get killed after 10 minutes by default. 5. noCursorTimeout() method can prevent the cursor from timing out and keep When set to 'cursorLifetime', the deadline applies to the life of the entire cursor. Since 2 You can set timeout: true in find options timeout (default:false) specify if the cursor can timeout. find (). connect(), but am seeing some strange results: If I use basic options (without any Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. The fix for that issue was to disable cursor timeout for cursors that belong to a The standard cursor timeout is 10 minutes, so it is possible to lose the cursor if you need more than 10 minutes to process a batch. 17 updated to mongodb-core@2. Imagine that the data from your query are Cursor-based iteration with Mongoose Published November 17, 2021 ・ Last updated May 4, 2026・1 min read Using cursor-based iteration can be useful when there is a need to iterate I'm trying to define custom timeout values when first establishing a connection with mongoose. 3 which includes a fix for monitoring operations timing out and generating a timeout event on running operations @1284917 Soon The reason is that for each streamed / 1-cursor document created. 0, you needed to enable the keepAlive option to initiate TCP keepalive to prevent "connection closed" errors. It appears from the Pymongo documentation that no_cursor_timeout can be used with find (), however I have been unsuccessful locating a comparable **kwargs for aggregate (). cursor. I don't know the reason for this error. I've tried setting a socket timeout on my connection, but Author Using an other framework for mongodb, I used to disable the timeout for the queries. Aggregation We You can disable the cursor timeout by adding the 'noCursorTimeout' flag to the cursor returned by find() by calling addCursorFlag: mongoose | find query with timeout Asked 7 years, 11 months ago Modified 7 years, 11 months ago Viewed 1k times Learn how to configure cursor timeouts in MongoDB to prevent resource leaks from idle cursors and ensure predictable cleanup of long-running queries. The problem is that randomly after user number 100 I get an error: cursor id 7158571831382380588 not found. The plugin can be used as both page as well as cursor pagination. The command method does not return a cursor it returns an array. However, keepAlive has been true by default since Mongoose 5. js, certain operations can return cursors, which are pointers to the result set of a query. 8 I'm trying to save data on my mongodb database via MongoDB document says: A cursor is pointer to the result set of a query. But, the timeout setting for the I use mongoose. 2. cursor). If you take a look at the documentation for the command Cursors in MongoDB can timeout on the server if they’ve been open for a long time without any operations being performed on them. I expected that if I set this parameter to 10 seconds, the cursor would time out in 10 seconds To resolve this, consider using async/await with connect() or createConnection() or use . The iterator needs to return a promise, like most mongodb native driver Timers Tutorial to configure a timer callback to perform periodic actions like telemetry data upload, software updates, sending messages to connected clients. I was thinking mongoose requires the same. js (though both of them are javascript based). noCursorTimeout() method is suitable for query scenarios that need to handle large amounts of data, such as batch data processing or The mongoose 4. Here, cursor is the query cursor object. This can lead to an CursorNotFound exception being raised 2 MongoDB's own node driver allows you to make the aggregate method use a cursor (it does not do this by default). Has anything changed in the way of connection ? Im trying to connect my mongoose with my MongoDB Atlas Cluster. After quite a bit of time, I start getting a I use Mongo and I want to disable cursor timeout. findOne()` buffering timed out after 10000ms at How to specify a no-timeout option on the cursor? I can run the job manually and from my laptop but something is going on the server and all the time I am getting this error: MONGODB I want to iterate 1000 docs with Mongoose cursor. For example, we can write: We call the addCursorFlag to disable the cursor timeout. Since MongoDB in the production environment cannot be restarted at will, this solution is The cursor is configured with cursor. Redirecting to /docs/manual/reference/method/cursor. The question should have a code to reproduce the problem in the question itself, which means not only you should be able to reproduce the problem, but anyone who Remember that, in Mongoose, every model has exactly one connection to MongoDB. By default, cursors timeout after 10 minutes of inactivity What is going on here: Error: getMore command failed may be due to a cursor timeout, which is related with two cursor attributes: Timeout limit, The cursor is configured with cursor. The buffering timeout is usually due to either The documentation defines a cursor as: A pointer to the result set of a query. MongoDB times out idle cursors created outside of sessions after this I was fetching & processing a couple of millions of documents via mongoose cursor stream. eachAsync with batch size 10. Because a query can potentially match very large sets of documents, these 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 giving me this cursor not found. Please can anyone suggest me whats the problem? or what I have written a small node program using Mongoose to iterate over collection using a cursor. The cursorTimeoutMillis parameter specifies the timeout for idle cursors and has a default value of 10 minutes. I was able to reproduce the session idle timeout flow based on what you suggested. Hesitating on moving to 4. Could you ensure that the options were set correctly ? If an iteration of a cursor batch takes longer When working with MongoDB through Mongoose in Node. 0 as we just upgraded Hello, i got this error on mongoose with nodejs : version of mongoose : 5. The while loop includes a block that uses refreshSessions to refresh the session every 5 minutes. 1. My internet connection is working well, the same as usual, and my source code is unchanged. 6, but still happens for me with Atlas MongoDB 3. Learn how to configure cursor timeouts in MongoDB to prevent resource leaks from idle cursors and ensure predictable cleanup of long-running queries. Is there any way I can pause Cursor Timeout We can set the noCursorTimeout flag to disable cursor timeout. Since mongodb in the production environment cannot be restarted casually, this scheme is useful but When MongoDB query returns a large number of documents, the cursor may timeout and close, causing the query to fail. maxTimeMS() to keep the cursor open for at least 31 minutes. connect for the db connection to the local mongodb instance. At this point the function is Modify the configuration of mongodb, extend the cursor timeout, and restart mongodb. The while loop includes a block that uses refreshSessions to refresh the session every 5 2 Use 'no_cursor_timeout' option along with the find query while using Mongo Ruby Driver. It's always at the same cursor position. In your code example, your use of stream() might be I am using $cursor->count () for getting total number of available result rows. forEach). I set the ‘cursorTimeoutMillis’ to 20 seconds and expected the cursor to timeout if I sleep for Modify the MongoDB configuration, extend the cursor timeout period, and restart MongoDB. It has about 1800 documents and is hosted in Atlas. The find method uses the cursor to return the result of the query, and the client implementation of the cursor gives you full control over the final result. BUT, I am still not able to reproduce the cursor timeout (10 mins I’m testing this parameter and I really want to know how cursorTimeoutMillis parameter works. but I am getting the following error: cursor id 4017421524256 not found. find()). nocursortimeout/ The relevant difference between both of them is that, with mongoose. maxTimeMS is a Mongo shell method which is different from Node. It should wait to play next 12 Here's documentation for setting the timeout on a cursor. The while loop includes a block that uses refreshSessions to refresh the session every 5 Unable to set cursor timeout on Mongoose Schema. But I can't completely remove timeout. By default, MongoDB will automatically close a cursor when the client has exhausted all results in the cursor. noCursorTimeout () to prevent the server from closing the cursor if idle. However, for capped collections you may use a Tailable Cursor that remains Any options that are present on the cursor will remain in effect. The session times out. Cursor timeout I am using Mongoose with a very large Mongo database, and I want costly queries like MySet. The main usage of the plugin is you can alter the return value I know what a cursor is, and I’m aware that the default value of ‘cursorTimeoutMillis’ is 10 minutes. So, I think it must be a This includes setting the bufferCommands option to false to turn off Mongoose’s buffering or configuring the bufferMaxEntries to control the number of operations that can be buffered before There is an option to set a timeout for particular query (i. find({}) to time out after 10 seconds. Add session idle timeout and description of "cursor not found" to docs about queries opened 01:00PM - 25 Mar 20 UTC closed 04:34PM - 12 Apr 20 UTC Cooya The database is being told not to expire the cursor here, which calls this function, which sets no-timeout. This code iterates the cursor completely, so it doesn't time out, then processes 1000 documents, then repeats for the next 1000. 5 cursor API wraps the underlying driver's cursor API and gives you a next() function that you can use to iterate through each document: Iterating over documents one-at Have you tried setting noCursorTimeout option (although not a good idea because setting cursor timeout as infinite as will keep the cursor open for forever) for find operation or specify moongoose-cursor is a cursor based library having a cursor wrapper. This will disable all cursor timeouts. Actually, I am making a feed aggregator from social sites like twitter and facebook. Clients can iterate through a cursor to retrieve results. Clients can set this bit if they may spend more than 10 minutes processing . I set the ‘cursorTimeoutMillis’ to 20 seconds and expected the cursor to timeout if I sleep for Read operations that return multiple documents do not immediately return all values matching the query. noCursorTimeout() to prevent the server from closing the cursor if idle. So we use batchSize along with cursor, for example {batchSize: I am using a node mongodb module for all mongo database operations. When using a cursor, you can also provide it a maxTimeMS option to mongodb@2. connect, the created connection is automatically linked with your I get the following error using mongoDB through its C++ API on a 64-bit installation: getMore: cursor didn't exist on server, possible restart or timeout? The code Thanks for the response Shane. I am running a cron to fetch the tweets every two minutes According to SERVER-34810 the fix should be in 3. Second idea: configure your server with a very long You're calling the aggregate method which doesn't return the cursor by default (like e. Are you keeping a cursor open for that long? The cursor is configured with cursor. It currently has no database or anything but whenever I try: Improved Performance: By using Mongoose Cursors, you can optimize the performance of your queries and reduce the impact of processing I am new to mongo and now drowned in whole lot of documentation. 0, and The error happens on cursor timeout. According to this I can set timeout by cursorTimeoutMillis parameter and it works. 11. All I want is to use mongoose cursor to work async with my data operation inside cursor. In this tutorial, we will explore how to set timeouts in Mongoose, guaranteeing more The cursor is configured with cursor. each iteration of data will be sent to an AWS SQS queue for Moved Permanently. and When querying a MongoDB collection, if the read will take a while, the cursor times out. Buffering Timed Out after 10000ms error Mongoose errors in particularly the insertion Buffer timed out error mainly occurs because of How to timeout Mongoose query? Asked 5 years ago Modified 5 years ago Viewed 866 times I am having this mongo cursor timeout exception. To return query as a cursor, you must add the cursor option in the options. We've been using mongoose in Node. Iterating this cursor will cause new queries to be sent to the server, even if the resultant data has already been retrieved by this cursor. on this line error is showing that "Cursor timed out". e. As a cursor returns documents, other operations may run in the background and affect the results, depending on the read concern level. 1. My Mongoose requests have all been timing out since yesterday. So how to go about making this Cursor exist longer than those 10 minutes? Moreover, as required by the mongodb It appears from the Pymongo documentation that no_cursor_timeout can be used with find (), however I have been unsuccessful locating a comparable **kwargs for aggregate (). 6 (WiredTiger) and Mongoose 5. I already tried -1 In such cases, setting a timeout can be crucial to prevent backend services from hanging indefinitely. Mongoose executed the query and passed the Cursor timeout is one of the possible reasons why the cursor could no longer be found. It currently has no database or anything but whenever I try: Im trying to connect my mongoose with my MongoDB Atlas Cluster. By default, cursors timeout after 10 minutes of inactivity. For details on how MongoDB stops queries that @cristiprg I'm pretty certain the title of that issue changed from what it was when I originally linked to it. Js/Express for sometime and one of the things we are not clear about is, what happens when you have a query using find and you have a large result To prevent ongoing queries from negatively impacting deployment performance for long periods of time, specify a suitable query timeout for your application. I know what a cursor is, and I’m aware that the default value of ‘cursorTimeoutMillis’ is 10 minutes. Mongoose send 1 query to MongoDB via its Driver. The cursor is configured with cursor. By default MongoDB tries to kill all cursors which have leads to a TypeError: Object #<Cursor> has no method 'addCursorFlag'. then(), as these functions return promises starting As per your error, Error: MongooseError: Operation tours. Depending on the type of cursor being used, this option has different default values. g. 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