Mongodb how many connections

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MongoError: failed to connect to server. My connections have dropped from the peak of s down to around now. It definitely looks like this is still an issue. Screen Shot at As you get more clients the connections will begin to even out and disperse to balance the loads of an ever increasing number of clients.

If you continue to experience any further issues with the connections not being released by the Realm application please let us know Realm app link and we would be happy to look into this further.

Realm internally proxies connection by default and keeps them open across multiple invocations so this will definitely be more efficient with connection utilization and may actually be more performant on average less of a latency hit for opening new connections. Realm generally opens a single connection pool per Realm host and manages connections at the Realm host-level.

So in another way to explain in short summary, connections count is not directly proportional on either the number of clients or the number of currently open Realms. Some unused connections can stay active on Atlas and later be reused by another Realm client. I completely understand the architect behind how the connections get made and thanks for clearing that side of it up. The additional connections made are understood, so for example, I log in to my Realm app as ONE client, but it actually makes 10 connections.

Either the existing connections that have been created should be used OR those connections should be dropped and new ones created for this instance. As such, I only have one or two test clients running at a time and the app has only 3 very small collections to sync with.

At any rate, the of connections never seems to really go down. Will these connections be released if I delete my Realm applications?

Same issue here and I reported it to support who opened an internal ticket. What I did in the meantime was to create a new Cluster and restore the most recent database snapshot back to the new cluster.

I then switched my Realm app to the new cluster. I deleted the application, waited 10 minutes, the connections were still there. Besides, the operation count are also non zero when no users are connected.

Somehow, it seems each user opens a number of connections that are kept active and asking for data each second. I tried updating a function via the UI and deploying the changes in dev and I still got a big jump in connections despite it not linking back to GitHub.

For more info, see the MongoDB manual page on ulimit settings. But wait, there's more! Creating threads uses mmap to allocate memory from stack. And on the kernel level there's a setting for max number of mmapped memory blocks per process, which must be increased too:. In the TCP protocol, one socket is identified with the tuple local address, local port, remote address, remote port and this tuple must be unique per socket. The port numbers range from 1 to So from a single benchmark client, I can only create outgoing connections.

To benchmark more connections than this, the only alternative is to have more than one client host, or at least more than one IP address for the client. But I didn't go that far. I was surprised to learn that by default Linux wouldn't even use the full range of 65k ports that TCP has possible. Even this had to be configured:. The two numbers are the min and max outgoing ports.

Note that this configuration is NOT necessary on a server, just the benchmark client. With the exact same configuration, but switching to c3. I haven't found any AWS documentation that would confirm my observation about M5 instances.

Nor did AWS support confirm it. So it could still be an error on my side.