{"action":"closed","issue":{"url":"https://api.github.com/repos/mperham/sidekiq/issues/2398","labels_url":"https://api.github.com/repos/mperham/sidekiq/issues/2398/labels{/name}","comments_url":"https://api.github.com/repos/mperham/sidekiq/issues/2398/comments","events_url":"https://api.github.com/repos/mperham/sidekiq/issues/2398/events","html_url":"https://github.com/mperham/sidekiq/issues/2398","id":89646484,"number":2398,"title":"Can a job be executed twice at the same time?","user":{"login":"edgarjs","id":12443,"avatar_url":"https://avatars.githubusercontent.com/u/12443?v=3","gravatar_id":"","url":"https://api.github.com/users/edgarjs","html_url":"https://github.com/edgarjs","followers_url":"https://api.github.com/users/edgarjs/followers","following_url":"https://api.github.com/users/edgarjs/following{/other_user}","gists_url":"https://api.github.com/users/edgarjs/gists{/gist_id}","starred_url":"https://api.github.com/users/edgarjs/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/edgarjs/subscriptions","organizations_url":"https://api.github.com/users/edgarjs/orgs","repos_url":"https://api.github.com/users/edgarjs/repos","events_url":"https://api.github.com/users/edgarjs/events{/privacy}","received_events_url":"https://api.github.com/users/edgarjs/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-06-19T19:50:28Z","updated_at":"2015-06-19T19:59:10Z","closed_at":"2015-06-19T19:59:10Z","body":"I've been reading the features of sidekiq, and about concurrency and idempotent jobs. However it's still not clear for me the level of concurrency sidekiq does work with.\r\n\r\nMy problem is that I've seen a couple of jobs being executed twice even if the first one succeeds. I even think that somes time a single job gets grabbed at the same time by two different workers (with like ms of difference between each other).\r\n\r\nAs I said, I understand that sidekiq can process a single job multiple times, but I'm not sure if it's expected to be processed **at the same time**.\r\n\r\nThank you."}}