{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/59430558","id":59430558,"diff_hunk":"@@ -343,6 +349,11 @@ public Void call() throws Exception {\n                                                   String metricsConfPath, @Nullable String logbackJarName) {\n     Map<String, String> configs = new HashMap<>();\n \n+    // Make Spark UI runs on random port. By default, Spark UI runs on port 4040 and it will do a sequential search\n+    // of the next port if 4040 is already occupied. However, during the process, it unnecessarily logs big stacktrace\n+    // as WARN, which pollute the logs a lot if there are concurrent Spark job running (e.g. a fork in Workflow).\n+    configs.put(\"spark.ui.port\", 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for the fix. devops should never assume that it is on port 404*","created_at":"2016-04-12T18:40:44Z","updated_at":"2016-04-12T18:40:44Z","html_url":"https://github.com/caskdata/cdap/pull/5499#discussion_r59430558","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/5499","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/59430558"},"html":{"href":"https://github.com/caskdata/cdap/pull/5499#discussion_r59430558"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/5499"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/5499","id":65874490,"html_url":"https://github.com/caskdata/cdap/pull/5499","diff_url":"https://github.com/caskdata/cdap/pull/5499.diff","patch_url":"https://github.com/caskdata/cdap/pull/5499.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/5499","number":5499,"state":"open","locked":false,"title":"(CDAP-5530) (CDAP-5547) Fix Spark ClassLoader and memory 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