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Hi Brian,

Thank you for your feedback.

Already for some time we have been asked by our colleagues form the experiments to give a clear timeline for XRootD4.
With the announcement we wanted to give the XRootD community a strong push towards XRootD5 so the migration is
finalised before RUN3. As we are moving with XRootD5 to C++14 it simply won’t be possible to back-port some of the
new developments/bugfixes to XRootD4 and hence the end of full support of XRootD4.

That said, nobody will be left behind. We are determined to help with the migration, and if there is a strong desire in the
community we can offer a period of limited support for XRootD4 (for example until end of Q2). 

XRootD5 is backwards compatible with XRootD4 and the transition should be straight forward. Nevertheless the sites
should allow themselves a time buffer before RUN3 so all potential issues can be addressed in a timely manner.

Let me know your thoughts!

Cheers,
Michal

On 15 Mar 2021, at 19:29, Brian Lin <[log in to unmask]> wrote:

Hi Michal,

Thanks for the updated timeline but I'd like to express that the short notice for XRootD 4 EOL is shocking. Although all of the XCaches in the OSG are using XRootD 5.x, there are many sites still using XRootD 4 out of OSG 3.5 production and I suspect that there will be sites using XRootD 4 until Feb '22. What are your plans to support these sites in a transition to XRootD 5?

Thanks,
Brian

On 3/13/21 6:03 AM, Michal Simon wrote:
[log in to unmask]" class="">
Dear all,

I am reposting the C++14 announcement as the date format I used in my previous email created some confusion.

Starting from the April 1st, 2021 we will be building XRootD with the -std=c++14 flag.

On Centos7 platform one will need to enable devtoolset-7 (please see the instructions bellow).

# 1. Install a package with repository for your system:
# On CentOS, install package centos-release-scl available in CentOS repository:
$ sudo yum install centos-release-scl

# 2. Install the collection:
$ sudo yum install devtoolset-7

# 3. Start using software collections:
$ scl enable devtoolset-7 bash

Please note that this means that it won't be possible to back-port some of the new developments/bugfixes to XRootD4, and hence XRootD4 will reach end of support.

Kind regards,
Michal


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