C0urante commented on code in PR #13465: URL: https://github.com/apache/kafka/pull/13465#discussion_r1202709620
########## connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java: ########## @@ -1247,6 +1257,257 @@ void sourceConnectorOffsets(String connName, ConnectorOffsetBackingStore offsetS }); } + /** + * Alter a connector's offsets. + * + * @param connName the name of the connector whose offsets are to be altered + * @param connectorConfig the connector's configurations + * @param offsets a mapping from partitions to offsets that need to be overwritten + * @param cb callback to invoke upon completion + */ + public void alterConnectorOffsets(String connName, Map<String, String> connectorConfig, + Map<Map<String, ?>, Map<String, ?>> offsets, Callback<Message> cb) { + String connectorClassOrAlias = connectorConfig.get(ConnectorConfig.CONNECTOR_CLASS_CONFIG); + ClassLoader connectorLoader = plugins.connectorLoader(connectorClassOrAlias); + Connector connector; + + try (LoaderSwap loaderSwap = plugins.withClassLoader(connectorLoader)) { + connector = plugins.newConnector(connectorClassOrAlias); + if (ConnectUtils.isSinkConnector(connector)) { + log.debug("Altering consumer group offsets for sink connector: {}", connName); + alterSinkConnectorOffsets(connName, connector, connectorConfig, offsets, connectorLoader, cb); + } else { + log.debug("Altering offsets for source connector: {}", connName); + alterSourceConnectorOffsets(connName, connector, connectorConfig, offsets, connectorLoader, cb); + } + } + } + + /** + * Alter a sink connector's consumer group offsets. + * <p> + * Visible for testing. + * + * @param connName the name of the sink connector whose offsets are to be altered + * @param connector an instance of the sink connector + * @param connectorConfig the sink connector's configuration + * @param offsets a mapping from topic partitions to offsets that need to be overwritten + * @param connectorLoader the connector plugin's classloader to be used as the thread context classloader + * @param cb callback to invoke upon completion + */ + void alterSinkConnectorOffsets(String connName, Connector connector, Map<String, String> connectorConfig, + Map<Map<String, ?>, Map<String, ?>> offsets, ClassLoader connectorLoader, Callback<Message> cb) { + executor.submit(plugins.withClassLoader(connectorLoader, () -> { + try { + Map<TopicPartition, Long> parsedOffsets = SinkUtils.validateAndParseSinkConnectorOffsets(offsets); + boolean alterOffsetsResult; + try { + alterOffsetsResult = ((SinkConnector) connector).alterOffsets(connectorConfig, parsedOffsets); + } catch (UnsupportedOperationException e) { + throw new ConnectException("Failed to alter offsets for connector " + connName + " because it doesn't support external " + + "modification of offsets", e); + } + + Class<? extends Connector> sinkConnectorClass = connector.getClass(); + Map<String, Object> adminConfig = adminConfigs( + connName, + "connector-worker-adminclient-" + connName, + config, + new SinkConnectorConfig(plugins, connectorConfig), + sinkConnectorClass, + connectorClientConfigOverridePolicy, + kafkaClusterId, + ConnectorType.SINK); + + SinkConnectorConfig sinkConnectorConfig = new SinkConnectorConfig(plugins, connectorConfig); + String groupId = (String) baseConsumerConfigs( + connName, "connector-consumer-", config, sinkConnectorConfig, + sinkConnectorClass, connectorClientConfigOverridePolicy, kafkaClusterId, ConnectorType.SINK).get(ConsumerConfig.GROUP_ID_CONFIG); + + Map<TopicPartition, OffsetAndMetadata> offsetsToAlter = parsedOffsets.entrySet() + .stream() + .filter(entry -> entry.getValue() != null) + .map(entry -> new AbstractMap.SimpleEntry<>(entry.getKey(), new OffsetAndMetadata(entry.getValue()))) + .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); + + Set<TopicPartition> partitionsToReset = parsedOffsets.entrySet() + .stream() + .filter(entry -> entry.getValue() == null) + .map(Map.Entry::getKey) + .collect(Collectors.toSet()); + + KafkaFuture<Void> adminFuture = KafkaFuture.completedFuture(null); + + Admin admin = adminFactory.apply(adminConfig); + + try { + if (!offsetsToAlter.isEmpty()) { + log.debug("Committing the following consumer group topic partition offsets using an admin client for sink connector {}: {}.", + connName, offsetsToAlter); + AlterConsumerGroupOffsetsOptions alterConsumerGroupOffsetsOptions = new AlterConsumerGroupOffsetsOptions().timeoutMs( + (int) ConnectResource.DEFAULT_REST_REQUEST_TIMEOUT_MS); + AlterConsumerGroupOffsetsResult alterConsumerGroupOffsetsResult = admin.alterConsumerGroupOffsets(groupId, offsetsToAlter, + alterConsumerGroupOffsetsOptions); + + adminFuture = alterConsumerGroupOffsetsResult.all(); + } + + adminFuture.whenComplete((ignored, error) -> { + if (error != null) { + Utils.closeQuietly(admin, "Offset alter admin for sink connector " + connName); + // When a consumer group is non-empty, only group members can commit offsets. The above attempt to alter offsets via the admin + // client will result in an UnknownMemberIdException if the consumer group is non-empty (i.e. if the sink tasks haven't stopped + // completely or if the connector is resumed while the alter offsets request is being processed) + if (error instanceof UnknownMemberIdException) { + cb.onCompletion(new ConnectException("Failed to alter consumer group offsets for connector " + connName + " either because its tasks " + + "haven't stopped completely yet or the connector was resumed before the request to alter its offsets could be successfully " + + "completed. If the connector is in a stopped state, this operation can be safely retried. If it doesn't eventually succeed, the " + + "Connect cluster may need to be restarted to get rid of the zombie sink tasks."), + null); + } else { + cb.onCompletion(new ConnectException("Failed to alter consumer group offsets for topic partitions " + offsetsToAlter.keySet() + " for " + + "connector " + connName, error), + null); + } + } else if (!partitionsToReset.isEmpty()) { + log.debug("Deleting the consumer group offsets for the following topic partitions using an admin client for sink connector {}: {}.", + connName, partitionsToReset); + DeleteConsumerGroupOffsetsOptions deleteConsumerGroupOffsetsOptions = new DeleteConsumerGroupOffsetsOptions().timeoutMs( + (int) ConnectResource.DEFAULT_REST_REQUEST_TIMEOUT_MS); + DeleteConsumerGroupOffsetsResult deleteConsumerGroupOffsetsResult = admin.deleteConsumerGroupOffsets(groupId, partitionsToReset, + deleteConsumerGroupOffsetsOptions); + deleteConsumerGroupOffsetsResult.all().whenComplete((ignored2, error2) -> { + Utils.closeQuietly(admin, "Offset alter admin for sink connector " + connName); + if (error2 != null) { + // The attempt to delete offsets for certain topic partitions via the admin client will result in a + // GroupSubscribedToTopicException if the consumer group is non-empty (i.e. if the sink tasks haven't stopped completely + // or if the connector is resumed while the alter offsets request is being processed). + if (error2 instanceof GroupSubscribedToTopicException) { + cb.onCompletion(new ConnectException("Failed to alter consumer group offsets for connector " + connName + " either because its tasks " + + "haven't stopped completely yet or the connector was resumed before the request to alter its offsets could be successfully " + + "completed. If the connector is in a stopped state, this operation can be safely retried. If it doesn't eventually succeed, the " + + "Connect cluster may need to be restarted to get rid of the zombie sink tasks."), + null); + } else { + cb.onCompletion(new ConnectException("Failed to delete consumer group offsets for topic partitions " + partitionsToReset + " for connector " + + connName, error2), + null); + } + } else { + completeAlterOffsetsCallback(alterOffsetsResult, cb); + } + }); + } else { + Utils.closeQuietly(admin, "Offset alter admin for sink connector " + connName); + completeAlterOffsetsCallback(alterOffsetsResult, cb); + } + }); + } catch (Throwable t) { + Utils.closeQuietly(admin, "Offset alter admin for sink connector " + connName); + throw t; + } + } catch (Throwable t) { + cb.onCompletion(ConnectUtils.maybeWrap(t, "Failed to alter offsets for sink connector " + connName), null); + } + })); + } + + /** + * Alter a source connector's offsets. + * + * @param connName the name of the source connector whose offsets are to be altered + * @param connector an instance of the source connector + * @param connectorConfig the source connector's configuration + * @param offsets a mapping from partitions to offsets that need to be overwritten + * @param connectorLoader the connector plugin's classloader to be used as the thread context classloader + * @param cb callback to invoke upon completion + */ + private void alterSourceConnectorOffsets(String connName, Connector connector, Map<String, String> connectorConfig, + Map<Map<String, ?>, Map<String, ?>> offsets, ClassLoader connectorLoader, Callback<Message> cb) { + SourceConnectorConfig sourceConfig = new SourceConnectorConfig(plugins, connectorConfig, config.topicCreationEnable()); + Map<String, Object> producerProps = config.exactlyOnceSourceEnabled() + ? exactlyOnceSourceTaskProducerConfigs(new ConnectorTaskId(connName, 0), config, sourceConfig, + connector.getClass(), connectorClientConfigOverridePolicy, kafkaClusterId) + : baseProducerConfigs(connName, "connector-offset-producer-" + connName, config, sourceConfig, + connector.getClass(), connectorClientConfigOverridePolicy, kafkaClusterId); + KafkaProducer<byte[], byte[]> producer = new KafkaProducer<>(producerProps); + + ConnectorOffsetBackingStore offsetStore = config.exactlyOnceSourceEnabled() + ? offsetStoreForExactlyOnceSourceConnector(sourceConfig, connName, connector, producer) + : offsetStoreForRegularSourceConnector(sourceConfig, connName, connector, producer); + + OffsetStorageWriter offsetWriter = new OffsetStorageWriter(offsetStore, connName, internalKeyConverter, internalValueConverter); + alterSourceConnectorOffsets(connName, connector, connectorConfig, offsets, offsetStore, producer, offsetWriter, connectorLoader, cb); + } + + // Visible for testing + void alterSourceConnectorOffsets(String connName, Connector connector, Map<String, String> connectorConfig, + Map<Map<String, ?>, Map<String, ?>> offsets, ConnectorOffsetBackingStore offsetStore, + KafkaProducer<byte[], byte[]> producer, OffsetStorageWriter offsetWriter, + ClassLoader connectorLoader, Callback<Message> cb) { + executor.submit(plugins.withClassLoader(connectorLoader, () -> { + try { + boolean alterOffsetsResult; + try { + alterOffsetsResult = ((SourceConnector) connector).alterOffsets(connectorConfig, offsets); + } catch (UnsupportedOperationException e) { + throw new ConnectException("Failed to alter offsets for connector " + connName + " because it doesn't support external " + + "modification of offsets", e); + } + + offsetStore.configure(config); + // This reads to the end of the offsets topic and can be a potentially time-consuming operation + offsetStore.start(); + + // The alterSourceConnectorOffsets method should only be called after all the connector's tasks have been stopped, and it's + // safe to write offsets via an offset writer + offsets.forEach(offsetWriter::offset); + + // We can call begin flush without a timeout because this newly created single-purpose offset writer can't do concurrent + // offset writes. We can also ignore the return value since it returns false if and only if there is no data to be flushed, + // and we've just put some data in the previous statement + offsetWriter.beginFlush(); + + try { + if (config.exactlyOnceSourceEnabled()) { + producer.initTransactions(); + producer.beginTransaction(); + } + log.debug("Committing the following partition offsets for source connector {}: {}", connName, offsets); + FutureCallback<Void> offsetWriterCallback = new FutureCallback<>(); + offsetWriter.doFlush(offsetWriterCallback); + if (config.exactlyOnceSourceEnabled()) { + producer.commitTransaction(); + } + offsetWriterCallback.get(ConnectResource.DEFAULT_REST_REQUEST_TIMEOUT_MS, TimeUnit.MILLISECONDS); + } catch (ExecutionException e) { + throw new ConnectException("Failed to alter offsets for source connector " + connName, e.getCause()); Review Comment: Fair enough, LGTM 👍 -- This is an automated message from the Apache Git Service. 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