chia7712 commented on code in PR #23946:
URL: https://github.com/apache/kafka/pull/23946#discussion_r4380246937
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core/src/test/scala/unit/kafka/zk/migration/ZkMigrationClientTest.scala:
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@@ -158,6 +158,52 @@ class ZkMigrationClientTest extends ZkMigrationTestHarness
{
assertEquals(List(1, 2, 3), partition1.isr)
}
+ /**
+ * The controller_epoch stored in a partition state znode is compared
against the epoch of the ZK
+ * controller (see KAFKA-20488), so the migration client must write the ZK
controller epoch and
+ * not the KRaft controller epoch.
+ */
+ @Test
+ def testPartitionStateUsesZkControllerEpoch(): Unit = {
+ // Claiming the controller bumps the ZK controller epoch from the
pre-created 1 to 2, which keeps
Review Comment:
What does `pre-created 1 to 2` mean?
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