dwavesystems / dwavesystems/dwave-cloud-client

urllib3 connection pool full warning message

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Description

With the latest version, v0.6.2, under heavy problem submit / answer download load, seeing messages like this:
```
WARNING:urllib3.connectionpool: Connection pool is full, discarding connection: ...
```
has been reported.

Steps to reproduce are not clear.

The warning is possibly related to increased number of threads that do requests to SAPI (in v0.6.2), and the size of connection pool staying the same. See [pool size options](https://urllib3.readthedocs.io/en/latest/advanced-usage.html#customizing-pool-behavior).

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