Hi,
[This is mostly for Andy, Brian, and Michal.]
In the context of XCache cluster used by CMSSW multi-source jobs there is an
issue with cmssw jobs requesting opening of a second source on the cache cluster
using the tried= opaque parameter to point to cache server already in use. This
leads to creation of another replica of the same file in the cache cluster.
The cache still needs to honor tried= in case there is a problem with the
existing server. However, asking for a new "extra" server in the context of
cache does not make much sense.
To distinguish these two conditions I propose to introduce a new opaque
directive, "using=", used to signal to the redirector that the client is already
using the listed servers.
On cmsd side this would be accompanied with a cms.dfs multisource count
("sister" option to cms.dfs retries). These two would then control how many
errors and parallel accesses are allowed for a client session.
Does this make sense?
Matevz
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