ahuang98 commented on code in PR #19658:
URL: https://github.com/apache/kafka/pull/19658#discussion_r2082035897
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raft/src/test/java/org/apache/kafka/raft/KafkaRaftClientTest.java:
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@@ -4569,6 +4574,55 @@ public void testObserverFetchWithNoLocalId(boolean
withKip853Rpc) throws Excepti
assertEquals(3, context.log.lastFetchedEpoch());
}
+ @Test
+ public void testExponentialElectionBackoffMs() {
+ Random mockedRandom = Mockito.mock(Random.class);
+ int electionBackoffMaxMs = 1000;
+
+ // test the bound of the first call to random.nextInt
+ for (int retries = 1; retries < 11; retries++) {
+ binaryExponentialElectionBackoffMs(electionBackoffMaxMs, retries,
mockedRandom);
+ ArgumentCaptor<Integer> nextIntCaptor =
ArgumentCaptor.forClass(Integer.class);
+ Mockito.verify(mockedRandom).nextInt(Mockito.eq(1),
nextIntCaptor.capture());
+ int actualBound = nextIntCaptor.getValue();
+ int expectedBound = (int) (2 * Math.pow(2, retries - 1));
+ assertEquals(expectedBound, actualBound, "Incorrect bound for
retries=" + retries);
+ Mockito.clearInvocations(mockedRandom);
+ }
+ // after the 10th retry, the bound of the first call to random.nextInt
will remain capped to
+ // (RETRY_BACKOFF_BASE_MS * 2 << 10)=2048 to prevent overflow
+ int firstNextIntMaxBound = 2048;
+ for (int retries = 11; retries < 13; retries++) {
+ binaryExponentialElectionBackoffMs(electionBackoffMaxMs, retries,
mockedRandom);
+ ArgumentCaptor<Integer> nextIntCaptor =
ArgumentCaptor.forClass(Integer.class);
+ Mockito.verify(mockedRandom).nextInt(Mockito.eq(1),
nextIntCaptor.capture());
+ int actualBound = nextIntCaptor.getValue();
+ assertEquals(firstNextIntMaxBound, actualBound);
+ Mockito.clearInvocations(mockedRandom);
+ }
+
+ // test that the return value of the method is capped to
QUORUM_ELECTION_BACKOFF_MAX_MS_CONFIG + jitter
+ int jitterMs = 50;
+ // any bound >= (1000 + jitter)/(RETRY_BACKOFF_BASE_MS)=21 will result
in returning this cap
+ for (int firstNextInt : Arrays.asList(21, 1000, firstNextIntMaxBound))
{
+ Mockito.when(mockedRandom.nextInt(1,
firstNextIntMaxBound)).thenReturn(firstNextInt);
+
Mockito.when(mockedRandom.nextInt(RETRY_BACKOFF_BASE_MS)).thenReturn(jitterMs);
+
+ int returnedBackoffMs =
binaryExponentialElectionBackoffMs(electionBackoffMaxMs, 11, mockedRandom);
+
+ // verify nextInt was called on both expected bounds
+ ArgumentCaptor<Integer> nextIntCaptor =
ArgumentCaptor.forClass(Integer.class);
+ Mockito.verify(mockedRandom).nextInt(Mockito.eq(1),
nextIntCaptor.capture());
+ Mockito.verify(mockedRandom).nextInt(nextIntCaptor.capture());
+ List<Integer> allCapturedBounds = nextIntCaptor.getAllValues();
+ assertEquals(firstNextIntMaxBound, allCapturedBounds.get(0));
+ assertEquals(RETRY_BACKOFF_BASE_MS, allCapturedBounds.get(1));
+
+ // finally verify the backoff returned is capped to
electionBackoffMaxMs + jitterMs
+ assertEquals(electionBackoffMaxMs + jitterMs, returnedBackoffMs);
+ }
Review Comment:
this doesn't seem to be necessary because mockedRandom is declared within
the test and this is the end of the test
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