Renat Akhmerov 1a4c599a4d Improve join by removing periodic jobs ... * This patch removes the approach with DB polling needed to determine if a "join" task is ready to run. Instead of running a periodic scheduled job, each task completion now runs the algorithm that finds all potentially affected join tasks and schedules just one job (instead of a periodic job) to check their readiness. This solves a problem of system cascaded overloading in case of having many very large joins (when a workflow has many joins with many dependencies each). Previously, in such case Mistral created too many periodic jobs that just didn't let the workflow progress well, i.e. most CPU was used by scheduler to run those periodic jobs that very rarely switched "join" tasks to the RUNNING state. Change-Id: I5ebc44c7a3f95c868d653689dc5cea689c788cd0 Closes-Bug: #1799356		2018-10-23 14:01:39 +07:00
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notes	Improve join by removing periodic jobs	2018-10-23 14:01:39 +07:00
source	Update reno for stable/rocky	2018-08-09 12:11:31 +00:00