sdks io for cassandra

[surpass]

Be sure to do all of the following to help us incorporate your contribution
quickly and easily:

• Make sure the PR title is formatted like:
  `[BEAM-SDKS-IO] cassandra io read and write

---

[coveralls]

Coverage increased (+0.003%) to 69.322% when pulling d090294 on surpass:master into b261d48 on apache:master.

[asfbot]

Refer to this link for build results (access rights to CI server needed):
https://builds.apache.org/job/beam_PreCommit_Java_MavenInstall/7882/
--none--

[jbonofre]

I guess you didn't see:

1. https://issues.apache.org/jira/browse/BEAM-245
2. [BEAM-245] Add Cassandra IO #592

[jbonofre]

I would appreciate you close this PR and contribute directly on the existing one.

[jbonofre]

Thanks !

[davorbonaci]

First, @surpass, thank you for your contribution. It is much appreciated and we'd like to have Cassandra support in Beam as soon as possible!

Indeded, @jbonofre has started this particular effort a while ago, and it would be great if you can work together to move this IO forward as quickly as possible.

Personally, I don't think we need to worry which PR goes first. Perhaps both can go in, in some order, to get a few distinct benefits from each of them.

I'd be happy to assist, as appropriate. Also, CC: @jkff, @dhalperi.

[jbonofre]

Original Cassandra PR is almost ready. I would like to merge pretty fast.

[mingmxu]

This version is conflicted with default version 20.0, it may breaks.

[zznate]

FYI this just changed in the Java-Driver to support v20: apache/cassandra-java-driver@1ddd09e and https://datastax-oss.atlassian.net/browse/JAVA-1328

[zznate]

Netty rev as well: https://github.com/datastax/java-driver/blob/3.1.x/pom.xml#L54

[jbonofre]

As said, I'm resuming/finishing work on #592

[jbonofre]

I just take a quick look to compare with what I did in #592. IMHO, this one is not what we want in Beam: this IO is basically a copy of JdbcIO updated for Cassandra. So basically, no splitting, no leveraging Cassandra features. I would recommend to close this PR and take a look on mine (I'm finalizing #592 this week).

[coveralls]

Coverage increased (+0.003%) to 70.624% when pulling 4f3543f on surpass:master into 0cba43e on apache:master.

[davorbonaci]

CassandraIO has been merged to Beam from a separate pull request. This pull request is pending closure. Any objections?

[jbonofre]

+1 to close this PR. I asked already some weeks ago.

[jkff]

@surpass Could you please close this PR?

Asking in part because I use Github's "Mentioned" PRs tab to keep track of what I need to review, and there is no way for me to remove the PR from there except by asking you to close it.