Hi Huseyn,
We have discussed some of this in another channel, but just in case it's
still helpful to you or somebody else I will leave a response here:
First, in the Ripe Atlas, I sometimes get “-1” in the result indicating
> 100% packet loss and sometimes very long RTTs. Can you tell me please what
> is the condition when Ripe gives up on a target and marks it as "-1”?
>
A value of "-1" is used for the min, max and avg statistics when all of the
packets timeout, in which case each packet result should have a value of
{"x": "*"}. A timeout is declared if the ping "packet_interval" is reached,
which defaults to 1000ms.
> Second, I have implemented asynchronous reading using web sockets and
> faced a rate limit on several concurrent web socket connections. The error
> message said:
> 'There are too many connections from this IP address. Try making
> multiple subscriptions on the same connection.’
> Can you tell me please, if there is a limit on the number of subscriptions
> on the same connection?
>
I know you're working around this now, but for the benefit of others there
is a concurrent connection limit of 16 (currently), and it's better to make
multiple subscriptions on the same WebSocket. The reason for this is that
otherwise we can (and have in the past) end up with many thousands of
persistent TCP connections for only a small number of users. The value of
16 was chosen to allow reasonable concurrent processing on the client-side
without overwhelming the servers with too many network connections.
> To solve the issue in the second question, I implemented a polling
> mechanism that periodically checks if the measurement is finished. In order
> to not overload the API, I attempted to retrieve multiple measurement
> results in a single call using the following API endpoint:
>
> GET /api/v2/measurements/{pk}/latest/
>
> The documentation of that API endpoint states: "Get the most recent
> results from one or more measurements”. However, I need help understanding
> how to specify multiple measurement IDs in this endpoint, because all
> options I tried failed with HTTP status code 405 (Method Not Allowed).
> Could you please show me the correct way of using this API endpoint?
>
The latest endpoint only supports a single measurement ID, so this is
indeed the correct way to use it.
Regards,
Chris
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