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From Zhenyu Zheng <zhengzhenyul...@gmail.com>
Subject Re: Wire compatibility between Hadoop 3.x client and 2.x server
Date Tue, 13 Oct 2020 01:37:14 GMT
Hi,

I'm not a Hadoop expert but I've had some experiences in the cloud
infrastructure that I think also makes sense in your case.
For 2.x client + 3.x Server case, the Server side can obviously provide
compatibility, so it should work fine. But in the opposite case,
it might have problem, because 2.x server may not understand new client
calls added in 3.x, for old calls, it should work fine, but
if some internal implementation has changed, it might also be a problem, so
you might have to check case by case.

BR,

On Tue, Oct 13, 2020 at 6:41 AM Chao Sun <sunchao@apache.org> wrote:

> Hi community,
>
> Does Hadoop 3.x provide wire compatibility between 3.x clients and 2.x
> server? There is a blog post from Cloudera [1] mentioning wire
> compatibility between 2.x clients and 3.x server, but not the other
> direction. Curious if someone knows this. Also it'd be good to know if
> someone is running this setup in prod. Thanks!
>
> Chao
>
> [1]:
> https://blog.cloudera.com/upgrading-clusters-workloads-hadoop-2-hadoop-3
>

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