{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/28838470","id":28838470,"diff_hunk":"@@ -50,14 +54,27 @@\n  */\n public class DefaultStreamWriter implements StreamWriter {\n \n+  private static final Logger LOG = LoggerFactory.getLogger(DefaultStreamWriter.class);\n+\n   private final String namespaceId;\n   private final EndpointStrategy endpointStrategy;\n+  /**\n+   * The program that is using this {@link StreamWriter}.\n+   */\n+  private final Id.Program program;\n+  private final Map<Id.Stream, Boolean> isStreamRegistered;\n+  private final UsageRegistry usageRegistry;\n \n   @Inject\n   public DefaultStreamWriter(@Assisted(\"namespaceId\") String namespaceId,\n+                             @Assisted(\"programId\") Id.Program program,\n+                             UsageRegistry usageRegistry,\n                              DiscoveryServiceClient discoveryServiceClient) {\n     this.namespaceId = namespaceId;\n+    this.program = program;\n     this.endpointStrategy = new RandomEndpointStrategy(discoveryServiceClient.discover(Constants.Service.STREAMS));\n+    this.isStreamRegistered = Maps.newHashMap();","path":"cdap-app-fabric/src/main/java/co/cask/cdap/app/stream/DefaultStreamWriter.java","position":47,"original_position":47,"commit_id":"625d6f0ce5e541e6e8a8f44bd06cdd76ce0c25f3","original_commit_id":"625d6f0ce5e541e6e8a8f44bd06cdd76ce0c25f3","user":{"login":"jwang47","id":1084704,"avatar_url":"https://avatars.githubusercontent.com/u/1084704?v=3","gravatar_id":"","url":"https://api.github.com/users/jwang47","html_url":"https://github.com/jwang47","followers_url":"https://api.github.com/users/jwang47/followers","following_url":"https://api.github.com/users/jwang47/following{/other_user}","gists_url":"https://api.github.com/users/jwang47/gists{/gist_id}","starred_url":"https://api.github.com/users/jwang47/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jwang47/subscriptions","organizations_url":"https://api.github.com/users/jwang47/orgs","repos_url":"https://api.github.com/users/jwang47/repos","events_url":"https://api.github.com/users/jwang47/events{/privacy}","received_events_url":"https://api.github.com/users/jwang47/received_events","type":"User","site_admin":false},"body":"I was assuming\r\n1. `HashMap` won't fail if `write` is called concurrently\r\n2. `ConcurrentMap` would incur more overhead, which would become significant","created_at":"2015-04-22T01:40:35Z","updated_at":"2015-04-22T01:40:35Z","html_url":"https://github.com/caskdata/cdap/pull/2188#discussion_r28838470","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/2188","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/28838470"},"html":{"href":"https://github.com/caskdata/cdap/pull/2188#discussion_r28838470"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/2188"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/2188","id":33806677,"html_url":"https://github.com/caskdata/cdap/pull/2188","diff_url":"https://github.com/caskdata/cdap/pull/2188.diff","patch_url":"https://github.com/caskdata/cdap/pull/2188.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/2188","number":2188,"state":"open","locked":false,"title":"CDAP-2216: Program/App-Stream usage registry integration","user":{"login":"jwang47","id":1084704,"avatar_url":"https://avatars.githubusercontent.com/u/1084704?v=3","gravatar_id":"","url":"https://api.github.com/users/jwang47","html_url":"https://github.com/jwang47","followers_url":"https://api.github.com/users/jwang47/followers","following_url":"https://api.github.com/users/jwang47/following{/other_user}","gists_url":"https://api.github.com/users/jwang47/gists{/gist_id}","starred_url":"https://api.github.com/users/jwang47/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jwang47/subscriptions","organizations_url":"https://api.github.com/users/jwang47/orgs","repos_url":"https://api.github.com/users/jwang47/repos","events_url":"https://api.github.com/users/jwang47/events{/privacy}","received_events_url":"https://api.github.com/users/jwang47/received_events","type":"User","site_admin":false},"body":"https://issues.cask.co/browse/CDAP-2216\r\nhttp://builds.cask.co/browse/CDAP-DUT1550-8\r\n\r\nTODO:\r\n- [ ] Test in distributed cluster. 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