"JobDir" is a mailbox-based persistent communication mechanism, for the moment adopted between the WM proxy and the WM. In the present release it is enabled by default. A tool is available for converting from the former mechanism based on filelist (conversion in the opposite way is also supported). At the moment this not done automatically. Of course, another option to handle this transition will consist in putting the WMS in drain and wait for the filelist to be empty.
Deleted:
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Modified design to allow for DNS-based load balancing mechanism