{"action":"created","comment":{"url":"https://api.github.com/repos/apache/kafka/pulls/comments/47412816","id":47412816,"diff_hunk":"@@ -169,8 +169,11 @@ public void run(long now) {\n         RecordAccumulator.ReadyCheckResult result = this.accumulator.ready(cluster, now);\n \n         // if there are any partitions whose leaders are not known yet, force metadata update\n-        if (result.unknownLeadersExist)\n+        if (result.unknownLeaderTopics.size() > 0) {\n+            for (String topic : result.unknownLeaderTopics)\n+                this.metadata.addWithExpiry(topic);","path":"clients/src/main/java/org/apache/kafka/clients/producer/internals/Sender.java","position":7,"original_position":7,"commit_id":"3964a4e8d8cb17a100d5b6f707f1a22e41296125","original_commit_id":"3964a4e8d8cb17a100d5b6f707f1a22e41296125","user":{"login":"hachikuji","id":12502538,"avatar_url":"https://avatars.githubusercontent.com/u/12502538?v=3","gravatar_id":"","url":"https://api.github.com/users/hachikuji","html_url":"https://github.com/hachikuji","followers_url":"https://api.github.com/users/hachikuji/followers","following_url":"https://api.github.com/users/hachikuji/following{/other_user}","gists_url":"https://api.github.com/users/hachikuji/gists{/gist_id}","starred_url":"https://api.github.com/users/hachikuji/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hachikuji/subscriptions","organizations_url":"https://api.github.com/users/hachikuji/orgs","repos_url":"https://api.github.com/users/hachikuji/repos","events_url":"https://api.github.com/users/hachikuji/events{/privacy}","received_events_url":"https://api.github.com/users/hachikuji/received_events","type":"User","site_admin":false},"body":"This seems a little obscure. Can you add to clarify why this is needed?","created_at":"2015-12-11T22:23:10Z","updated_at":"2015-12-11T22:23:10Z","html_url":"https://github.com/apache/kafka/pull/645#discussion_r47412816","pull_request_url":"https://api.github.com/repos/apache/kafka/pulls/645","_links":{"self":{"href":"https://api.github.com/repos/apache/kafka/pulls/comments/47412816"},"html":{"href":"https://github.com/apache/kafka/pull/645#discussion_r47412816"},"pull_request":{"href":"https://api.github.com/repos/apache/kafka/pulls/645"}}},"pull_request":{"url":"https://api.github.com/repos/apache/kafka/pulls/645","id":53060972,"html_url":"https://github.com/apache/kafka/pull/645","diff_url":"https://github.com/apache/kafka/pull/645.diff","patch_url":"https://github.com/apache/kafka/pull/645.patch","issue_url":"https://api.github.com/repos/apache/kafka/issues/645","number":645,"state":"open","locked":false,"title":"KAFKA-2948: Remove unused topics from producer metadata set","user":{"login":"rajinisivaram","id":13164074,"avatar_url":"https://avatars.githubusercontent.com/u/13164074?v=3","gravatar_id":"","url":"https://api.github.com/users/rajinisivaram","html_url":"https://github.com/rajinisivaram","followers_url":"https://api.github.com/users/rajinisivaram/followers","following_url":"https://api.github.com/users/rajinisivaram/following{/other_user}","gists_url":"https://api.github.com/users/rajinisivaram/gists{/gist_id}","starred_url":"https://api.github.com/users/rajinisivaram/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rajinisivaram/subscriptions","organizations_url":"https://api.github.com/users/rajinisivaram/orgs","repos_url":"https://api.github.com/users/rajinisivaram/repos","events_url":"https://api.github.com/users/rajinisivaram/events{/privacy}","received_events_url":"https://api.github.com/users/rajinisivaram/received_events","type":"User","site_admin":false},"body":"If no messages are sent to a topic during the last refresh interval or if UNKNOWN_TOPIC_OR_PARTITION error is received, remove the topic from the metadata list. Topics are added to the list on the next attempt to send a message to the 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