akalash commented on a change in pull request #17437:
URL: https://github.com/apache/flink/pull/17437#discussion_r726336587
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File path:
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/tasks/bufferdebloat/BufferDebloaterTest.java
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@@ -105,14 +107,50 @@ public void testNegativeConsumptionTime() {
testBufferSizeCalculation(3, asList(3, 5, 8), 3333, 50, 1100, -1, 248);
}
- private void testBufferSizeCalculation(
+ @Test
+ public void
testAnnouncedMaxBufferSizeEvenDespiteLastDiffLessThanThreshold() {
+ // Calculate the buffer size a little lower than the max buffer size.
+ BufferDebloater bufferDebloater =
+ testBufferSizeCalculation(1, singletonList(1), 500, 50, 1100,
1000, 500);
+ bufferDebloater.recalculateBufferSize(1000);
+ assertThat(bufferDebloater.getLastBufferSize(), is(1000));
+
+ // Recalculate the buffer size to max value.
+ bufferDebloater.recalculateBufferSize(2000);
+
+ // The max value should be announced despite it differ from the
previous one by less than
+ // threshold value.
+ assertThat(bufferDebloater.getLastBufferSize(), is(1100));
+
+ // Make sure that there is no repeated announcement of max buffer size.
+ bufferDebloater.recalculateBufferSize(2000);
+ }
+
+ @Test
+ public void
testAnnouncedMinBufferSizeEvenDespiteLastDiffLessThanThreshold() {
+ // Calculate the buffer size a little greater than the min buffer size.
+ BufferDebloater bufferDebloater =
+ testBufferSizeCalculation(1, singletonList(1), 60, 50, 1100,
1000, 60);
Review comment:
The initial value is always max value but after this method, it will be
60(because throughput is 60). But you are right and I will add this information
explicitly
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