cxm940188 commented on code in PR #23525:
URL: https://github.com/apache/kafka/pull/23525#discussion_r4109562958
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metadata/src/test/java/org/apache/kafka/controller/QuorumControllerTest.java:
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@@ -1637,6 +1652,61 @@ public void testAppendRecordsAtomically() {
appender)).getMessage());
}
+ @ParameterizedTest(name = "numRecords={0}, maxRecordsPerBatch={1}")
+ @CsvSource({
+ "1, 1",
+ "5, 1",
+ "5, 10",
+ "10, 10",
+ "15, 10",
+ "20, 10"
+ })
+ public void testAppendRecordsNonAtomicBatching(int numRecords, int
maxRecordsPerBatch) {
+ List<ApiMessageAndVersion> records = new ArrayList<>();
+ for (int i = 0; i < numRecords; i++) {
+ records.add(rec(i));
+ }
+ RecordingAppender appender = new RecordingAppender();
+ long returned = QuorumController.appendRecords(log,
+ ControllerResult.of(records, null), maxRecordsPerBatch, appender);
+
+ List<Integer> expectedSizes = new ArrayList<>();
+ for (int i = 0; i < numRecords; i += maxRecordsPerBatch) {
+ expectedSizes.add(Math.min(maxRecordsPerBatch, numRecords - i));
+ }
+ assertEquals(expectedSizes, appender.batchSizes,
+ "batches should be exactly maxRecordsPerBatch-sized except the
final one");
+ assertTrue(appender.batchSizes.stream().allMatch(s -> s > 0 && s <=
maxRecordsPerBatch),
+ "every batch should be non-empty and no larger than
maxRecordsPerBatch");
+ assertEquals(numRecords,
appender.batchSizes.stream().mapToLong(Integer::longValue).sum(),
+ "no record should be dropped or duplicated");
+ assertEquals((long) numRecords, returned);
+ }
+
+ @Test
+ public void testNonAtomicWriteDoesNotTriggerControllerFailover() throws
Throwable {
+ try (
+ MockRaftClientTestEnv clientEnv = new
MockRaftClientTestEnv.Builder(1).build();
+ QuorumControllerTestEnv controlEnv = new
QuorumControllerTestEnv.Builder(clientEnv)
+ // Set the batch size to 1 so that any non-empty write is an
exact multiple
+ // of maxRecordsPerBatch, exercising the off-by-one path.
+ .setControllerBuilderInitializer(b ->
b.setControllerMaxRecordsPerBatch(1))
+ .build()
+ ) {
+ // Wait for the controller to become active and finish activation.
+ QuorumController controller = controlEnv.activeController(true);
+
+ // Remember the leadership epoch so we can detect a failover.
+ int epochBefore = controller.curClaimEpoch();
+
+ // A non-atomic write (broker registration) goes through the real
production appender
+ assertEquals(1, registerBrokersAndUnfence(controller, 1).size());
Review Comment:
Thanks @kevin-wu24 . You're right: with `maxRecordsPerBatch == 1` any
non-empty write is already an exact multiple, so the count was meaningless. The
real check (epoch unchanged) stays.
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