[Utilities/XrdAdaptor] Multi-source open requests should specify triedrc=resel

[osschar]

Since xrootd-4.10 xrootd server supports differentiated processing of file-open requests for server reselection. There are two main uses:

1. Local storage accessed through xrootd where server reselection should not "escape" outside of the local cluster.
2. XCache clusters, where opening of a file multiple times effectively creates several copies of that file in the cache, thus wasting the cache space.

Both of these use-cases are covered by introducing the opaque parameter triedrc=resel into the request URL when opening a new file for multi-source reading.

[cmsbuild]

A new Issue was created by @osschar Matev Tadel.

@Dr15Jones, @smuzaffar, @silviodonato, @kpedro88, @davidlange6, @fabiocos can you please review it and eventually sign/assign? Thanks.

cms-bot commands are listed here

[osschar]

Justas (juztas) and @osschar will do the changes, @bbockelm agreed to help and review the changes.

[makortel]

assign core

[cmsbuild]

New categories assigned: core

@Dr15Jones,@smuzaffar,@makortel you have been requested to review this Pull request/Issue and eventually sign? Thanks

[makortel]

+1

Done in #34700

[cmsbuild]

This issue is fully signed and ready to be closed.