Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/4353#discussion_r129272281 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/TaskStateSnapshot.java --- @@ -0,0 +1,137 @@ +/* + * 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.flink.runtime.checkpoint; + +import org.apache.flink.runtime.jobgraph.OperatorID; +import org.apache.flink.runtime.state.CompositeStateHandle; +import org.apache.flink.runtime.state.SharedStateRegistry; +import org.apache.flink.runtime.state.StateUtil; +import org.apache.flink.util.Preconditions; + +import java.util.HashMap; +import java.util.Map; +import java.util.Set; + +/** + * This class encapsulates state handles to the snapshots of all operator instances executed within one task. A task + * can run multiple operator instances as a result of operator chaining, and all operator instances from the chain can + * register their state under their operator id. Each operator instance is a physical execution responsible for + * processing a partition of the data that goes through a logical operator. This partitioning happens to parallelize + * execution of logical operators, e.g. distributing a map function. + * <p>One instance of this class contains the information that one task will send to acknowledge a checkpoint request by t --- End diff -- add empty line before paragraph
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---