ServerStatus | Real-time Server Status Monitoring By SignalR in DotNetCore | Websocket library
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kandi X-RAY | ServerStatus Summary
Real-time Server Status Monitoring By SignalR in DotNetCore
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QUESTION
We chose to deploy the mongos router in the same VM as our applications, but we're running into some issues where the application gets OOM Killed because the mongos eats up a lot more RAM than we'd expect / want to.
After a reboot, the mongos footprint is a bit under 2GB, but from here it constantly requires more memory. About 500MB per week. It went up to 4.5+GB
This is the stats for one of our mongos for the past 2 weeks and it clearly looks like it's leaking memory...
So my question is: how to investigate such behavior? We've not really been able to find explanations as of why the router might require more RAM, or how to diagnosis the behavior much. Or even how to set a memory usage limit to the mongos.
With a db.serverStatus on the mongos we can see the allocations:
ANSWER
Answered 2021-May-03 at 04:04Why the router would require more memory?
If there is any query in the sharded cluster where the system needs to do a scatter gather then merging activity is taken care of by the mongos itself.
For example I am running a query db.collectionanme.find({something : 1})
If this something field here is not the shard key itself then by default it will do a scatter gather, use explainPlan to check the query. It does a scatter gather because mongos interacts with config server and realises that it doesn't have information for this respective field. {This is applicable for a collection which is sharded}
To make things worse, if you have sorting operations where the index cannot be used then even that now has to be done on the mongos itself. Sorting operations have to block the memory segment to get the pages together based on volume of data then sort works, imagine the best possible Big O for a sorting operation here. Till that is done the memory is blocked for that operation.
What you should do?
Based on settings (your slowms setting, default should be 100ms), check the logs, take a look at your slow queries in the system. If you see a lot of SHARD_MERGE & in memory sorts taking place then you have your culprit right there.
And for quick fix increase the Swap memory availability and make sure settings are apt.
All the best.
QUESTION
I'm trying connect to mySQL server with code below: (just part of my whole code)
...ANSWER
Answered 2021-Apr-29 at 22:03As Jason already mentioned this is a horrible idea to do. Instead, I suggest you build some mini REST API or even use some of the serverless services out there.
When you have that REST API or Azure Function ready then you can communicate with them using your C# code, more precisely using HttpClient from the .NET.
Your mobile app will be the client which will "talk" to REST API, and REST API will proceed with your request and make the request to the DB, grab some data and return you JSON or XML which you can, later on, deserialize into C# objects and show to the user.
The most simple example is located on the MS Docs page here, so you can take a look.
Wishing you lots of luck with coding!
QUESTION
I have a custom hook useServerStatus that fetches from a RESTful API with axios. Checking the network tab, the response went through fine, I can see all my data. Using console.log to print out the result or using debugger to check the result in the browser works flawlessly. However, calling the setState method that I get from useState will not save the response data.
ServerStatus Interface (ServerStatus.ts)
...ANSWER
Answered 2021-Mar-26 at 09:21Following the lesson here https://reactjs.org/docs/hooks-custom.html the most obvious thing that jumps out to me is that you aren't returning the state variable serverStatus in your code vs. the example is returning "isOnline". Try to match this by returning serverStatua in your custom effect to see if it helps.
QUESTION
it doesn't show any error but database table doesn't update
id and status taken from HTML form
ANSWER
Answered 2021-Mar-26 at 09:56What you have to do, you have to change the sequence of array member in array to [status, id] from [id,status]
And also as mentioned by Robert Kawecki, your request has to be a POST request to fetch status value from the body.
QUESTION
i have this issue when i tried to run my app in a physical device in debug mode. When I try to debug the next code:
...ANSWER
Answered 2021-Mar-17 at 08:28QUESTION
the json string comes like this ,
[[{"id":39,"mail":"mail@mm04.com","password":"q149","name":"Anthony","photo":"a14.png","dateac":"1900-01-01T18:36:36.000Z"},{"id":40,"mail":"mail@mm04.com","password":"q14","name":"Anthony","photo":"a3.png","dateac":"1900-01-01T18:36:36.000Z"}],{"fieldCount":0,"affectedRows":0,"insertId":0,"serverStatus":34,"warningCount":0,"message":"","protocol41":true,"changedRows":0}]
I need to convert to two objects: on the one hand a list of people and the other a control record, I appreciate any guide I am new to dart and I have been trying for several days. Thanks.
...ANSWER
Answered 2021-Jan-28 at 05:33QUESTION
I know you might mark it as duplicate or downvote it. but I am unable to figure out a solution despite searching over forums and google. I am basically trying to create a migration system for MySQL nodejs. Code:
...ANSWER
Answered 2021-Jan-25 at 11:09The problem is that you are using forEach to iterate over migrations in main trigger function. Of course the forEach cannot be awaited from the outer async function. Here it is my suggestion(not tested)
QUESTION
I am making an API for my minecraft server and have been able to get as far as getting the JSON file to update what I send it in a POST request. I would like to know if it is possible to only update on key of the JSON file.
This is my current code:
...ANSWER
Answered 2020-Dec-20 at 09:54You could use require to get .json file content.
Then update your JSON content such as jsonData["survival"] = "online".
Final, write content back to file with fs.writeFile. (See note-1)
You could see the following example code.
QUESTION
I am trying to use async await with mysql2 and pooling but I think I doing things wrong. Below is my code (as I said, I am not really sure if I am doing things right here).
...ANSWER
Answered 2020-Nov-26 at 00:07If you insert multiple rows into the same table, and the table has an AUTO_INCREMENT primary key style column, the server assigns the values for you. You don't need to know the insertId of the first row you insert to get the second row inserted correctly.
The insertId value you need is in addUser.insertId.
QUESTION
I am trying to figure out how does angular import modules and I am not sure why would it not be able to load the forms module from the root.
...ANSWER
Answered 2020-Sep-29 at 12:53Angular can only look up the stack not down.
So if you only want to create the import of FormsModule ones put it in a shared Module that gets imported in child Modules (with an export of it).
Without it being imported into the child modules, it does not know about the existence.
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