C0urante commented on code in PR #11779:
URL: https://github.com/apache/kafka/pull/11779#discussion_r890817292
##########
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java:
##########
@@ -582,6 +588,59 @@ public boolean startTask(
}
}
+ /**
+ * Using the admin principal for this connector, perform a round of zombie
fencing that disables transactional producers
+ * for the specified number of source tasks from sending any more records.
+ * @param connName the name of the connector
+ * @param numTasks the number of tasks to fence out
+ * @param connProps the configuration of the connector; may not be null
+ * @return a {@link KafkaFuture} that will complete when the producers
have all been fenced out, or the attempt has failed
+ */
+ public KafkaFuture<Void> fenceZombies(String connName, int numTasks,
Map<String, String> connProps) {
+ return fenceZombies(connName, numTasks, connProps, Admin::create);
+ }
+
+ // Allows us to mock out the Admin client for testing
+ KafkaFuture<Void> fenceZombies(String connName, int numTasks, Map<String,
String> connProps, Function<Map<String, Object>, Admin> adminFactory) {
+ log.debug("Fencing out {} task producers for source connector {}",
numTasks, connName);
+ try (LoggingContext loggingContext =
LoggingContext.forConnector(connName)) {
+ ClassLoader savedLoader = plugins.currentThreadLoader();
+ try {
+ String connType =
connProps.get(ConnectorConfig.CONNECTOR_CLASS_CONFIG);
+ ClassLoader connectorLoader =
plugins.delegatingLoader().connectorLoader(connType);
+ savedLoader = Plugins.compareAndSwapLoaders(connectorLoader);
+ final SourceConnectorConfig connConfig = new
SourceConnectorConfig(plugins, connProps, config.topicCreationEnable());
+ final Class<? extends Connector> connClass =
plugins.connectorClass(
+
connConfig.getString(ConnectorConfig.CONNECTOR_CLASS_CONFIG));
+
+ Map<String, Object> adminConfig = adminConfigs(
+ connName,
+ "connector-worker-adminclient-" + connName,
+ config,
+ connConfig,
+ connClass,
+ connectorClientConfigOverridePolicy,
+ kafkaClusterId,
+ ConnectorType.SOURCE);
+ Admin admin = adminFactory.apply(adminConfig);
Review Comment:
Good catch, done.
##########
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java:
##########
@@ -582,6 +588,59 @@ public boolean startTask(
}
}
+ /**
+ * Using the admin principal for this connector, perform a round of zombie
fencing that disables transactional producers
+ * for the specified number of source tasks from sending any more records.
+ * @param connName the name of the connector
+ * @param numTasks the number of tasks to fence out
+ * @param connProps the configuration of the connector; may not be null
+ * @return a {@link KafkaFuture} that will complete when the producers
have all been fenced out, or the attempt has failed
+ */
+ public KafkaFuture<Void> fenceZombies(String connName, int numTasks,
Map<String, String> connProps) {
+ return fenceZombies(connName, numTasks, connProps, Admin::create);
+ }
+
+ // Allows us to mock out the Admin client for testing
+ KafkaFuture<Void> fenceZombies(String connName, int numTasks, Map<String,
String> connProps, Function<Map<String, Object>, Admin> adminFactory) {
+ log.debug("Fencing out {} task producers for source connector {}",
numTasks, connName);
+ try (LoggingContext loggingContext =
LoggingContext.forConnector(connName)) {
+ ClassLoader savedLoader = plugins.currentThreadLoader();
+ try {
+ String connType =
connProps.get(ConnectorConfig.CONNECTOR_CLASS_CONFIG);
+ ClassLoader connectorLoader =
plugins.delegatingLoader().connectorLoader(connType);
+ savedLoader = Plugins.compareAndSwapLoaders(connectorLoader);
Review Comment:
Ah yeah, been toying with that idea for a while but never got around to
trying it out. Works pretty well in this case; the one wrinkle is that the
signature for `AutoCloseable::close` includes a checked exception. I've added a
new (internal) `LoaderSwap` class that implements `AutoCloseable` and removes
that checked exception to address that.
If this looks good, we can retrofit other parts of the code base to leverage
it in a follow-up.
##########
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Herder.java:
##########
@@ -138,6 +138,17 @@ public interface Herder {
*/
void putTaskConfigs(String connName, List<Map<String, String>> configs,
Callback<Void> callback, InternalRequestSignature requestSignature);
+ /**
+ * Fence out any older task generations for a source connector, and then
write a record to the config topic
+ * indicating that it is safe to bring up a new generation of tasks. If
that record is already present, do nothing
+ * and invoke the callback successfully.
+ * @param connName the name of the connector to fence out; must refer to a
source connector
Review Comment:
The callback is invoked with an error (added to Javadocs)
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