{"action":"closed","issue":{"url":"https://api.github.com/repos/proofpoint/platform/issues/394","repository_url":"https://api.github.com/repos/proofpoint/platform","labels_url":"https://api.github.com/repos/proofpoint/platform/issues/394/labels{/name}","comments_url":"https://api.github.com/repos/proofpoint/platform/issues/394/comments","events_url":"https://api.github.com/repos/proofpoint/platform/issues/394/events","html_url":"https://github.com/proofpoint/platform/issues/394","id":56313044,"node_id":"MDU6SXNzdWU1NjMxMzA0NA==","number":394,"title":"Lock Contention In HttpServiceBalancerImpl","user":{"login":"gwittel","id":484093,"node_id":"MDQ6VXNlcjQ4NDA5Mw==","avatar_url":"https://avatars3.githubusercontent.com/u/484093?v=4","gravatar_id":"","url":"https://api.github.com/users/gwittel","html_url":"https://github.com/gwittel","followers_url":"https://api.github.com/users/gwittel/followers","following_url":"https://api.github.com/users/gwittel/following{/other_user}","gists_url":"https://api.github.com/users/gwittel/gists{/gist_id}","starred_url":"https://api.github.com/users/gwittel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gwittel/subscriptions","organizations_url":"https://api.github.com/users/gwittel/orgs","repos_url":"https://api.github.com/users/gwittel/repos","events_url":"https://api.github.com/users/gwittel/events{/privacy}","received_events_url":"https://api.github.com/users/gwittel/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2015-02-03T00:00:28Z","updated_at":"2018-09-09T16:33:06Z","closed_at":"2018-09-09T16:33:06Z","author_association":"MEMBER","body":"In situations with high request volumes to a small set of URIs, we observed lock contention in blocks that synchronize on `concurrentAttempts` within the `HttpServiceBalancerImpl`.  In particular, we see blocking in two places:\n1.  `HttpServiceAttemptImpl(Set<URI> attempted)`\n2.  `HttpServiceAttemptImpl#decrementConcurrency`\n\nThe locking system could use improvements given its a single lock across all URIs.\n"}}
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