{"action":"opened","issue":{"url":"https://api.github.com/repos/alibaba/jstorm/issues/404","repository_url":"https://api.github.com/repos/alibaba/jstorm","labels_url":"https://api.github.com/repos/alibaba/jstorm/issues/404/labels{/name}","comments_url":"https://api.github.com/repos/alibaba/jstorm/issues/404/comments","events_url":"https://api.github.com/repos/alibaba/jstorm/issues/404/events","html_url":"https://github.com/alibaba/jstorm/issues/404","id":197678224,"number":404,"title":"Stop BackPressure 消息丢失","user":{"login":"vivilife","id":8147441,"avatar_url":"https://avatars.githubusercontent.com/u/8147441?v=3","gravatar_id":"","url":"https://api.github.com/users/vivilife","html_url":"https://github.com/vivilife","followers_url":"https://api.github.com/users/vivilife/followers","following_url":"https://api.github.com/users/vivilife/following{/other_user}","gists_url":"https://api.github.com/users/vivilife/gists{/gist_id}","starred_url":"https://api.github.com/users/vivilife/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vivilife/subscriptions","organizations_url":"https://api.github.com/users/vivilife/orgs","repos_url":"https://api.github.com/users/vivilife/repos","events_url":"https://api.github.com/users/vivilife/events{/privacy}","received_events_url":"https://api.github.com/users/vivilife/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-12-27T10:00:01Z","updated_at":"2016-12-27T10:00:01Z","closed_at":null,"body":"最近一个 Topology 出现问题， 8个spout 中只有 2个正常发送消息，另外6个每分钟发送消息为个位数。 \r\n\r\ndump出worker 的heap 发现，这些有问题的spout 处于 backpressure 状态， sleep 时间高达86秒。因为有2个spout 工作正常，怀疑这6个spout的 stop backpressure 消息丢失。\r\n\r\n请问 JStorm 能否确保backpressure 之类的控制消息不会丢失？如果可能丢失，能否通过重发消息解决"}}
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