cxm940188 commented on code in PR #23525:
URL: https://github.com/apache/kafka/pull/23525#discussion_r4321932147
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metadata/src/test/java/org/apache/kafka/controller/QuorumControllerTest.java:
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@@ -1637,6 +1652,54 @@ public void testAppendRecordsAtomically() {
appender)).getMessage());
}
+ @ParameterizedTest(name = "numRecords={0}, maxRecordsPerBatch={1}")
+ @CsvSource({
+ "1, 1",
+ "5, 1",
+ "5, 10",
+ "10, 10",
+ "15, 10",
Review Comment:
Thanks for the suggestion @jsancio.
For this particular off-by-one, the only trigger is ` records.size() %
maxRecordsPerBatch == 0`. The old loop appended an empty trailing batch solely
when the size was an exact multiple of the batch size. For
`maxRecordsPerBatch=10`, that means 10, 20, 30, …; 9 and 11 are non-multiples
and take the identical code path before and after the fix (9 → a single batch
of 9; 11 → batches of 10 and 1), so they can't exercise the buggy branch.
The exact-multiple cases are already covered by "`10, 10`" and "`20, 10`",
plus every positive size under "`1, 1`" / "`5, 1`" (where every size is a
multiple). So I'd keep the current matrix rather than add 9/11.
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