stevenzwu commented on a change in pull request #2105: URL: https://github.com/apache/iceberg/pull/2105#discussion_r564074591
########## File path: flink/src/main/java/org/apache/iceberg/flink/source/assigner/SplitAssigner.java ########## @@ -0,0 +1,102 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.iceberg.flink.source.assigner; + +import java.util.Collection; +import java.util.Map; +import java.util.concurrent.CompletableFuture; +import javax.annotation.Nullable; +import org.apache.flink.api.connector.source.SplitEnumeratorContext; +import org.apache.iceberg.flink.source.split.IcebergSourceSplit; +import org.apache.iceberg.flink.source.split.IcebergSourceSplitStatus; + +/** + * Enumerator should call the assigner APIs from the coordinator thread. + * This is to simplify the thread safety for assigner implementation. + */ +public interface SplitAssigner extends AutoCloseable { + + /** + * Some assigners may need to start background threads or perform other activity such as + * registering as listeners to updates from other event sources e.g., watermark tracker. + */ + default void start() { + } + + /** + * Some assigners may need to perform certain actions + * when their corresponding enumerators are closed + */ + @Override + default void close() { + } + + /** + * Request a new split from the assigner + * as enumerator trying to assign splits to awaiting readers + */ + GetSplitResult getNext(@Nullable String hostname); Review comment: that is true. but I am not sure we need to document the enumerator behavior in the assigner interface/contract. Assigner is responsible of returning a split if available. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
