Manu - one thing to make sure your aware of is with the latest driver version (4.9) it’s not just about binary compatibility.
There has been a removal of certain core features from the driver which if you are using you may find you’ve more work todo then you expected. The ability to route requests to your non-local DC via driver retry policies doesn’t seem to be there anymore. Also changing your choice of consistency on driver retries is also gone (not necessarily a bad thing). It’s not possible to implement your own retry policy to replicate this as the driver api seems to have completely removed the hookins to do this within the driver retry mechanism. The docs say this should be done at the app level and is not the drivers responsibility now. However replicating this functionality at the app level is not trivial particular when leveraging asynchronous calls and (depending on your testing guidelines) probably warrants a lot of testing on the app itself. Have a look at resiliance4j retry component if you need to go down that route - it’s pretty handy. Regards, Johnny On Tue, 27 Oct 2020 at 08:14, Manu Chadha <manu.cha...@hotmail.com> wrote: > Thanks Erick. I agree that I should considering moving to latest version. > > > > Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows 10 > > > > *From: *Erick Ramirez <erick.rami...@datastax.com> > *Sent: *26 October 2020 22:55 > *To: *user@cassandra.apache.org > *Subject: *Re: migrating driver from 3.4 to 4.9 > > > > Yes, Java driver 4 is not binary-compatible with older versions. Our > recommendation is that you upgrade to the latest version instead of > re-coding your app for an older version. If you run into issues with the > older version, you will have to upgrade anyway to get the fix. Java driver > v3.4 was released in January 2018 so it's very old. > > > > See the upgrade guide here -- > https://docs.datastax.com/en/developer/java-driver/4.9/. Cheers! > > > -- Sent from my iPhone, apologies for any typos -- -- The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.digitalis.io <http://www.digitalis.io>
