afedulov commented on code in PR #950:
URL:
https://github.com/apache/flink-kubernetes-operator/pull/950#discussion_r1985027312
##########
examples/autoscaling/src/main/java/autoscaling/LoadSimulationPipeline.java:
##########
@@ -74,8 +78,50 @@ public static void main(String[] args) throws Exception {
for (String branch : maxLoadPerTask.split("\n")) {
String[] taskLoads = branch.split(";");
+ /*
+ * Creates an unbounded stream that continuously emits the
constant value 42L.
+ * Flink's DataGeneratorSource with RateLimiterStrategy is used to
control the emission rate.
+ *
+ * Emission Rate Logic:
+ * - The goal is to generate a fixed number of impulses per
sampling interval.
+ * - `samplingIntervalMs` defines the duration of one sampling
interval in milliseconds.
+ * - We define `IMPULSES_PER_SAMPLING_INTERVAL = 10`, meaning that
for every sampling interval,
+ * exactly 10 impulses should be generated.
+ *
+ * To calculate the total number of records emitted per second:
+ * 1. Determine how many sampling intervals fit within one second:
+ * samplingIntervalsPerSecond = 1000 / samplingIntervalMs;
+ * 2. Multiply this by the number of impulses per interval to get
the total rate:
+ * impulsesPerSecond = IMPULSES_PER_SAMPLING_INTERVAL *
samplingIntervalsPerSecond;
+ *
+ * Example Calculations:
+ * - If `samplingIntervalMs = 1000 ms`:
+ * - `samplingIntervalsPerSecond = 1000 / 1000 = 1`
+ * - `impulsesPerSecond = 10 * 1 = 10 records per second`
+ * - If `samplingIntervalMs = 500 ms`:
+ * - `samplingIntervalsPerSecond = 1000 / 500 = 2`
+ * - `impulsesPerSecond = 10 * 2 = 20 records per second`
+ * - If `samplingIntervalMs = 2000 ms`:
+ * - `samplingIntervalsPerSecond = 1000 / 2000 = 0.5`
+ * - `impulsesPerSecond = 10 * 0.5 = 5 records per second`
+ *
+ * This approach ensures that the number of records emitted
dynamically scales
+ * based on the sampling interval while maintaining the target of
10 impulses per interval.
+ * RateLimiterStrategy internally distributes these emissions
efficiently over time.
+ */
DataStream<Long> stream =
- env.addSource(new
ImpulseSource(samplingIntervalMs)).name("ImpulseSource");
+ env.fromSource(
+ new DataGeneratorSource<>(
+ (GeneratorFunction<Long, Long>)
+ (index) -> 42L, // Emits constant
value 42
+ Long.MAX_VALUE, // Unbounded stream
+ RateLimiterStrategy.perSecond(
+ (double) 1000
Review Comment:
More importantly, actually adjust the calculation to align with the
description
a/b/c -> (a/b)*c
c: 10 -> IMPULSES_PER_SAMPLING_INTERVAL
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