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Summary: Fixes T9994. Currently, when Drydock can't allocate a new resource because some limit has been reached, it waits patiently for a resource to become available. It is possible that no resource will ever become available. Particularly with "Working Copy" resources, the new lease may want a copy of `rB`, but the resource may already be maxed out on `rA`. Right now, no process exists to automatically reclaim the unused `rA`. When we encounter this situation, try to reclaim one of the other resources if it is just sitting there unused. Specifically: - Add a "reclaim" command which means "release this resource //if// it is completely unused". - Add a `bin/drydock reclaim` to send this command to every active resource. - When we try to acquire a resource and can't, but only because of some kind of limit / utilization problem, try to release an unused resource to free up some room. Test Plan: - Set "Working Copy" resource limit to 1. - Ran "Test Configuration" in `rA`, which worked. - Ran "Test Configuration" in `rB`, which hung forever. - Applied patch. - Ran "Test Configuration" in `rB`, saw it reclaim the `rA` resource, use the slot, then succeed. - Ran "Test Configuration" in `rA` again, saw it grab the slot back. - Ran `bin/drydock reclaim` and saw it reclaim a bunch of old orphaned resources. Reviewers: chad Reviewed By: chad Maniphest Tasks: T9994 Differential Revision: https://secure.phabricator.com/D14819 |
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