cmccabe commented on code in PR #15744:
URL: https://github.com/apache/kafka/pull/15744#discussion_r1572722514
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core/src/main/scala/kafka/zk/KafkaZkClient.scala:
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@@ -467,13 +470,33 @@ class KafkaZkClient private[zk] (zooKeeperClient:
ZooKeeperClient, isSecure: Boo
* @param rootEntityType entity type
* @param sanitizedEntityName entity name
* @throws KeeperException if there is an error while setting or creating
the znode
+ * @throws ControllerMovedException if no controller is defined, or a KRaft
controller is defined
*/
def setOrCreateEntityConfigs(rootEntityType: String, sanitizedEntityName:
String, config: Properties): Unit = {
+ val controllerRegistration = getControllerRegistration match {
+ case Some(registration) => registration
+ case None =>
+ // This case is mainly here to make tests less flaky. In practice,
there will always be a /controller ZNode
+ throw new ControllerMovedException(s"Cannot set entity configs when
there is no controller.")
+ }
+
+ // If there is a KRaft controller defined, don't even attempt this write.
The broker will soon get a UMR
+ // from the new KRaft controller that lets it know about the new
controller. It will then forward
+ // IncrementalAlterConfig requests instead of processing directly.
+ if (controllerRegistration.kraftEpoch.exists(epoch => epoch > 0)) {
+ throw new ControllerMovedException(s"Cannot set entity configs directly
when there is a KRaft controller.")
+ }
def set(configData: Array[Byte]): SetDataResponse = {
val setDataRequest =
SetDataRequest(ConfigEntityZNode.path(rootEntityType, sanitizedEntityName),
configData, ZkVersion.MatchAnyVersion)
- retryRequestUntilConnected(setDataRequest)
+ if (controllerRegistration.zkVersion > 0) {
+ // Pass the zkVersion previously captured to ensure the controller
hasn't changed to KRaft while
+ // this method was processing.
+ retryRequestUntilConnected(setDataRequest,
controllerRegistration.zkVersion)
+ } else {
+ retryRequestUntilConnected(setDataRequest)
Review Comment:
can you explain how we'd get to this branch of the "if" statement? Surely
the controller znode always has a version?
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