[GitHub] [flink-kubernetes-operator] gyfora commented on a diff in pull request #227: [FLINK-27685] Scale subresource prototype

[GitBox <gi...@apache.org>]

gyfora commented on code in PR #227:
URL: https://github.com/apache/flink-kubernetes-operator/pull/227#discussion_r894195379


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flink-kubernetes-operator/src/main/java/org/apache/flink/kubernetes/operator/utils/FlinkUtils.java:
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@@ -278,4 +280,10 @@ public static boolean isKubernetesHAActivated(Configuration configuration) {
     public static boolean clusterShutdownDisabled(FlinkDeploymentSpec spec) {
         return spec.getFlinkVersion().isNewerVersionThan(FlinkVersion.v1_14);
     }
+
+    public static int getNumTaskManagers(Configuration conf) {
+        int parallelism = conf.get(CoreOptions.DEFAULT_PARALLELISM);
+        int taskSlots = conf.get(TaskManagerOptions.NUM_TASK_SLOTS);
+        return (parallelism + taskSlots - 1) / taskSlots;

Review Comment:
   In java integer division always rounds down. 5/2 would result in 2 instead of rounding up to 3 what we need to compute here. `(parallelism + taskSlots - 1) / taskSlots` is a nice trick to divide parallelism/taskslots while rounding up.



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