{"action":"opened","issue":{"url":"https://api.github.com/repos/dotnet/orleans/issues/1012","labels_url":"https://api.github.com/repos/dotnet/orleans/issues/1012/labels{/name}","comments_url":"https://api.github.com/repos/dotnet/orleans/issues/1012/comments","events_url":"https://api.github.com/repos/dotnet/orleans/issues/1012/events","html_url":"https://github.com/dotnet/orleans/issues/1012","id":116219792,"number":1012,"title":"Orleans.Streams.QueueCacheMissException: Item not found in cache","user":{"login":"andycwk","id":2248787,"avatar_url":"https://avatars.githubusercontent.com/u/2248787?v=3","gravatar_id":"","url":"https://api.github.com/users/andycwk","html_url":"https://github.com/andycwk","followers_url":"https://api.github.com/users/andycwk/followers","following_url":"https://api.github.com/users/andycwk/following{/other_user}","gists_url":"https://api.github.com/users/andycwk/gists{/gist_id}","starred_url":"https://api.github.com/users/andycwk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/andycwk/subscriptions","organizations_url":"https://api.github.com/users/andycwk/orgs","repos_url":"https://api.github.com/users/andycwk/repos","events_url":"https://api.github.com/users/andycwk/events{/privacy}","received_events_url":"https://api.github.com/users/andycwk/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-11-10T22:46:06Z","updated_at":"2015-11-10T22:46:06Z","closed_at":null,"body":"Hi,\r\n\r\nI've added streams into my solution and keep receiving the following exception, this was happening a lot in dev - but updating to 1.1.0-beta1 seemed to have resolved the issue.\r\n\r\nI've now deployed into QA and the issue has reappeared!\r\n\r\nThe big issue for me is that once this exception occurs, the stream agent appears to stop pushing any more events out to the stream consumers!\r\n\r\nAny thoughts on how I can debug this further, or even how I can detect the issue and restart processing?\r\n\r\n```xml\r\n\r\n    <Message>EventName=&quot;MessageEvent&quot; Message=&quot;[2015-11-10 21:23:38.558 GMT    15\tERROR  \t0\tWorkspaceHistoryNotificationsBuilder *grn/6A8E938A/425f28bdbc14b4aa9ba56e004541769d030000006a8e938a-0x3C5E6574\t]\t!!!!!!!!!! Item not found in cache.  Requested: [EventSequenceToken: SeqNum=35, EventIndex=0], Low: [EventSequenceToken: SeqNum=37, EventIndex=0], High: [EventSequenceToken: SeqNum=37, EventIndex=0]\t\r\nExc level 0: Orleans.Streams.QueueCacheMissException: Item not found in cache.  Requested: [EventSequenceToken: SeqNum=35, EventIndex=0], Low: [EventSequenceToken: SeqNum=37, EventIndex=0], High: [EventSequenceToken: SeqNum=37, EventIndex=0]\r\n   at Orleans.Providers.Streams.Common.SimpleQueueCache.InitializeCursor(SimpleQueueCacheCursor cursor, StreamSequenceToken sequenceToken, Boolean enforceSequenceToken)\r\n   at Orleans.Providers.Streams.Common.SimpleQueueCache.GetCacheCursor(Guid streamGuid, String streamNamespace, StreamSequenceToken token)\r\n   at Orleans.Streams.PersistentStreamPullingAgent.&lt;DoHandshakeWithConsumer&gt;d__1e.MoveNext()&quot; TraceSource=&quot;WaWorkerHost.exe&quot;</Message>\r\n\r\n```\r\n"}}