{"action":"created","comment":{"url":"https://api.github.com/repos/apache/kafka/pulls/comments/170376245","pull_request_review_id":99062577,"id":170376245,"diff_hunk":"@@ -103,6 +103,19 @@ private Bytes keyBytes(final K key) {\n         return Bytes.wrap(serdes.rawKey(key));\n     }\n \n+    @Override\n+    public V fetch(final K key, final long timestamp) {\n+        final long startNs = time.nanoseconds();\n+        byte[] result;\n+        try {\n+            result = inner.fetch(keyBytes(key), timestamp);\n+        } finally {\n+            metrics.recordLatency(this.fetchTime, startNs, time.nanoseconds());\n+        }\n+\n+        return 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catch!!","created_at":"2018-02-23T21:46:20Z","updated_at":"2018-02-23T21:46:20Z","html_url":"https://github.com/apache/kafka/pull/4578#discussion_r170376245","pull_request_url":"https://api.github.com/repos/apache/kafka/pulls/4578","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/kafka/pulls/comments/170376245"},"html":{"href":"https://github.com/apache/kafka/pull/4578#discussion_r170376245"},"pull_request":{"href":"https://api.github.com/repos/apache/kafka/pulls/4578"}},"in_reply_to_id":170369777},"pull_request":{"url":"https://api.github.com/repos/apache/kafka/pulls/4578","id":169510612,"html_url":"https://github.com/apache/kafka/pull/4578","diff_url":"https://github.com/apache/kafka/pull/4578.diff","patch_url":"https://github.com/apache/kafka/pull/4578.patch","issue_url":"https://api.github.com/repos/apache/kafka/issues/4578","number":4578,"state":"open","locked":false,"title":"KAFKA-6560: Replace range query with newly added single point query in Windowed Aggregation [WIP]","user":{"login":"guozhangwang","id":10729597,"avatar_url":"https://avatars0.githubusercontent.com/u/10729597?v=4","gravatar_id":"","url":"https://api.github.com/users/guozhangwang","html_url":"https://github.com/guozhangwang","followers_url":"https://api.github.com/users/guozhangwang/followers","following_url":"https://api.github.com/users/guozhangwang/following{/other_user}","gists_url":"https://api.github.com/users/guozhangwang/gists{/gist_id}","starred_url":"https://api.github.com/users/guozhangwang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/guozhangwang/subscriptions","organizations_url":"https://api.github.com/users/guozhangwang/orgs","repos_url":"https://api.github.com/users/guozhangwang/repos","events_url":"https://api.github.com/users/guozhangwang/events{/privacy}","received_events_url":"https://api.github.com/users/guozhangwang/received_events","type":"User","site_admin":false},"body":"* Add a new fetch(K key, long window-start-timestamp) API into ReadOnlyWindowStore.\r\n* Use the new API to replace the range fetch API in KStreamWindowedAggregate and KStreamWindowedReduce.\r\n* Added corresponding unit tests.\r\n* Also removed some redundant byte serdes in byte stores.\r\n\r\nRunning some modified simple benchmark with a very limited resource machine on windowed count (https://github.com/apache/kafka/pull/4614) have the following result:\r\n\r\nBranch | MB / sec | Records / sec\r\n-- | -- | -- \r\nTrunk | 0.029 | 317.4\r\nKAFKA-6560 | 5.84 | 63823.58\r\n\r\n### Committer Checklist (excluded from commit message)\r\n- [ ] Verify design and implementation \r\n- [ ] Verify test coverage and CI build status\r\n- [ ] Verify documentation (including upgrade notes)\r\n","created_at":"2018-02-15T23:06:33Z","updated_at":"2018-02-23T21:46:20Z","closed_at":null,"merged_at":null,"merge_commit_sha":"ba44e4774d86801f847dd99a08b921e2596615af","assignee":null,"assignees":[],"requested_reviewers":[],"requested_teams":[],"labels":[{"id":820747028,"url":"https://api.github.com/repos/apache/kafka/labels/streams","name":"streams","color":"63edea","default":false}],"milestone":null,"commits_url":"https://api.github.com/repos/apache/kafka/pulls/4578/commits","review_comments_url":"https://api.github.com/repos/apache/kafka/pulls/4578/comments","review_comment_url":"https://api.github.com/repos/apache/kafka/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/kafka/issues/4578/comments","statuses_url":"https://api.github.com/repos/apache/kafka/statuses/5ff4abbf039283e71760e50092007499666e92b5","head":{"label":"guozhangwang:K6560-use-single-query-for-window-agg-processor","ref":"K6560-use-single-query-for-window-agg-processor","sha":"5ff4abbf039283e71760e50092007499666e92b5","user":{"login":"guozhangwang","id":10729597,"avatar_url":"https://avatars0.githubusercontent.com/u/10729597?v=4","gravatar_id":"","url":"https://api.github.com/users/guozhangwang","html_url":"https://github.com/guozhangwang","followers_url":"https://api.github.com/users/guozhangwang/followers","following_url":"https://api.github.com/users/guozhangwang/following{/other_user}","gists_url":"https://api.github.com/users/guozhangwang/gists{/gist_id}","starred_url":"https://api.github.com/users/guozhangwang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/guozhangwang/subscriptions","organizations_url":"https://api.github.com/users/guozhangwang/orgs","repos_url":"https://api.github.com/users/guozhangwang/repos","events_url":"https://api.github.com/users/guozhangwang/events{/privacy}","received_events_url":"https://api.github.com/users/guozhangwang/received_events","type":"User","site_admin":false},"repo":{"id":39164613,"name":"kafka","full_name":"guozhangwang/kafka","owner":{"login":"guozhangwang","id":10729597,"avatar_url":"https://avatars0.githubusercontent.com/u/10729597?v=4","gravatar_id":"","url":"https://api.github.com/users/guozhangwang","html_url":"https://github.com/guozhangwang","followers_url":"https://api.github.com/users/guozhangwang/followers","following_url":"https://api.github.com/users/guozhangwang/following{/other_user}","gists_url":"https://api.github.com/users/guozhangwang/gists{/gist_id}","starred_url":"https://api.github.com/users/guozhangwang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/guozhangwang/subscriptions","organizations_url":"https://api.github.com/users/guozhangwang/orgs","repos_url":"https://api.github.com/users/guozhangwang/repos","events_url":"https://api.github.com/users/guozhangwang/events{/privacy}","received_events_url":"https://api.github.com/users/guozhangwang/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/guozhangwang/kafka","description":"Mirror 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