Cassandra storage not compatible with Python 3.12

[ekzhu]

When running in Python 3.12, get the following error:

datasketch/__init__.py:4: in <module>
    from datasketch.lsh import MinHashLSH
datasketch/lsh.py:7: in <module>
    from datasketch.storage import ordered_storage, unordered_storage, _random_name
datasketch/storage.py:17: in <module>
    from cassandra import cluster as c_cluster
cassandra/cluster.py:173: in init cassandra.cluster
    ???
E   cassandra.DependencyException: Unable to load a default connection class
E   The following exceptions were observed: 
E    - The C extension needed to use libev was not found.  This probably means that you didn't have the required build dependencies when installing the driver.  See http://datastax.github.io/python-driver/installation.html#c-extensions for instructions on installing build dependencies and building the C extension.
E    - Unable to import asyncore module.  Note that this module has been removed in Python 3.12 so when using the driver with this version (or anything newer) you will need to use one of the other event loop implementations.

[ekzhu]

@ostefano Could you help with this issue?

[rupeshkumaar]

@ekzhu I have taken a look at the issue and it seems that Datastax already raised this. Sharing the ticket
cassandra-driver for Python 3.12 Linux is compiled without libev support

[ekzhu]

• Unable to import asyncore module. Note that this module has been removed in Python 3.12 so when using the driver with this version (or anything newer) you will need to use one of the other event loop implementations.

Thanks for looking into this. Regarding the second point in the error message:

E - Unable to import asyncore module. Note that this module has been removed in Python 3.12 so when using the driver with this version (or anything newer) you will need to use one of the other event loop implementations.

Is there anything we have to do on our end?

[rupeshkumaar]

We might have to use asyncio since asyncore has been deprecated. But even if we implement it I think it will be a short time thing because once the issue is resolved and the new drivers are released we might have to reinstall it and it might create an issue again. We can still think about it. @ekzhu

[ekzhu]

Thanks. Let's wait for their issue to resolve.