Hi Recently I've detected some random problems when trying to connect to mongo using the node-red-contrib-mongodb4 plugin. Attached you have a simple flow that includes some basic stuff to get the collections from a database, try to find a specific one (defined in the init node) and do something de…

Ok, problem found (it had nothing to do with the library getting frozen at all). What I don't understand is the policy used by nodered to execute the code, because the problem was like 6 nodes ahead of the mongo ones and still I couldn't see any debug messages at all before the point, although they…

[image] Colin: This can happen if the browser is hung up doing something (so it is not able to display the debug messages), or if the browser is running on the same machine running node red, then the machine itself is so busy that the browser does not get a look in. Probably there are other poss…

Show us a screenshot of the nodes from the mongo node up the the one that had the infinite loop, including the debug node(s) whose output did not appear.

Attached you have a very simplified flow showing this. In this case, 2 nodes generate debug messages (Find collection multiple messages and Process elements one) until the flow reaches Read variable, where I've forced an infinite loop. If you just comment the while in this last node, you can see all…

Can you add debug nodes to the outputs of the mongo nodes, set to Output Complete Message, and capture the output and paste it here so I can simulate the flow. This canned text explains how to copy output from the debug window in a way that can be copied and used in a flow: There’s a great page in…

In order to show the output of the Get collections node, I've had to remove the link to the next function node, otherwise I get a RangeError: Maximum call stack size exceeded error. The output is this: [imagen] As you can see, the path to reach the names of the collections is: msg.payload[x].s.na…

[image] Mamonetti: I've had to remove the link to the next function node, otherwise I get a RangeError: Maximum call stack size exceeded error. I don't understand what you mean. Are you saying that having the function node linked changes what you see in the debug node showing what is coming …

Also, in order that full message is posted here, you must use the Copy Value button in the debug pane as described in the previous post. Then I can put that into an inject or function node to simulate the mongo node.

[image] Colin: I don't understand what you mean. Or do you just mean you had to remove the infinite loop, in which case yes, obviously.

Ok, the full output of the Get collections node is here: output.json (59.3 KB) I have tried to insert it directly in the post but the maximum limit is exceeded. This is a quite large payload (around 60 KB), and that's why if I run the flow connecting the output of this node to both the debug and …

[image] Mamonetti: I get this RangeError: Maximum call stack size exceeded message. If you pretty-print this output, you'll see around 3700 lines of nested stuff, and it looks like cloning such a json is just too much (it works fine as long as it doesn't need cloning, if you only have either the…

Node-RED

Node-RED Forum

Mongodb4 hangs randomly

General

Mamonetti 18 August 2024 12:30 16

With this, again nodered freezes and I don't see debug messages.

Regards

Topic		Replies	Views
Node red crash. - JavaScript heap out of memory General	10	4139	20 March 2020
Node-Red crashes with RangeError: Maximum call stack size exceeded General	26	4462	14 May 2020
Node-red Startup Console: connecting: mongodb://127.0.0.1:27017/{{mydb}} General	8	385	2 February 2022
Debug node causing RangeError: Maximum call stack size exceeded General	29	3217	5 August 2020
Node-red inject node and debug nodes are not working correctly after deploying in rancher General	8	216	31 July 2023

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

Mongodb4 hangs randomly

Related topics