{"action":"opened","issue":{"url":"https://api.github.com/repos/GoogleCloudPlatform/DataflowJavaSDK/issues/55","labels_url":"https://api.github.com/repos/GoogleCloudPlatform/DataflowJavaSDK/issues/55/labels{/name}","comments_url":"https://api.github.com/repos/GoogleCloudPlatform/DataflowJavaSDK/issues/55/comments","events_url":"https://api.github.com/repos/GoogleCloudPlatform/DataflowJavaSDK/issues/55/events","html_url":"https://github.com/GoogleCloudPlatform/DataflowJavaSDK/issues/55","id":105521394,"number":55,"title":"Aggregators cannot be created dynamically","user":{"login":"francesperry","id":10078933,"avatar_url":"https://avatars.githubusercontent.com/u/10078933?v=3","gravatar_id":"","url":"https://api.github.com/users/francesperry","html_url":"https://github.com/francesperry","followers_url":"https://api.github.com/users/francesperry/followers","following_url":"https://api.github.com/users/francesperry/following{/other_user}","gists_url":"https://api.github.com/users/francesperry/gists{/gist_id}","starred_url":"https://api.github.com/users/francesperry/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/francesperry/subscriptions","organizations_url":"https://api.github.com/users/francesperry/orgs","repos_url":"https://api.github.com/users/francesperry/repos","events_url":"https://api.github.com/users/francesperry/events{/privacy}","received_events_url":"https://api.github.com/users/francesperry/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-09-09T05:22:23Z","updated_at":"2015-09-09T05:22:23Z","closed_at":null,"body":"Currently, Aggregators have to be created during DoFn construction. That rules out useful cases like dynamically creating a small number of aggregators to track excepts that get thrown during DoFn execution.\r\n\r\n(See http://stackoverflow.com/questions/32469446/create-aggregators-dynamically-for-exceptions )"}}