[Condor-devel] STARTD_SENDS_ALVIES = TRUE is known safe?

[Matthew Farrellee <matt@xxxxxxxxxx>]

Recently the default for STARTD_SENDS_ALIVES changed from FALSE to TRUE.

https://condor-wiki.cs.wisc.edu/index.cgi/tktview?tn=671
https://condor-wiki.cs.wisc.edu/index.cgi/tktview?tn=1420

A few questions -

 o What happens in the case of a pre-7.5.4 Schedd configured with 
STARTD_SENDS_ALIVES=TRUE and a post-7.5.4 Startd?
 o We can currently disconnect a Schedd and it will reconnect with 
running jobs when it returns.
  . Is this still possible with the Startd sending the alives?
  . What is the impact on the Startd when the Schedd is not accessible?
  . Is a test being written for shadow-starter reconnect?
 o A benefit of STARTD_SENDS_ALIVES is that it is TCP and ACKd.
  . What other configuration changes must be done to a Schedd that is 
managing 10Ks of jobs?
  . #671 suggests offloading work from the Schedd, what's the impact on 
the Schedd performance in responding to ALIVES? What extra resources are 
used?
 o Before, if we wanted to renew all leases when a Schedd is going down 
we could with a small change to the Schedd. Is this still possible, or 
must a new protocol be created between Schedd and Startd?

Best,


matt