FangYongs commented on code in PR #1022: URL: https://github.com/apache/incubator-paimon/pull/1022#discussion_r1177407410
########## paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/source/operator/MonitorFunction.java: ########## @@ -0,0 +1,222 @@ +/* + * 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.paimon.flink.source.operator; + +import org.apache.paimon.flink.utils.JavaTypeInfo; +import org.apache.paimon.table.source.DataSplit; +import org.apache.paimon.table.source.EndOfScanException; +import org.apache.paimon.table.source.ReadBuilder; +import org.apache.paimon.table.source.Split; +import org.apache.paimon.table.source.StreamTableScan; + +import org.apache.flink.api.common.state.CheckpointListener; +import org.apache.flink.api.common.state.ListState; +import org.apache.flink.api.common.state.ListStateDescriptor; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.common.typeutils.TypeSerializer; +import org.apache.flink.api.common.typeutils.base.LongSerializer; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.api.java.typeutils.runtime.TupleSerializer; +import org.apache.flink.runtime.state.FunctionInitializationContext; +import org.apache.flink.runtime.state.FunctionSnapshotContext; +import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction; +import org.apache.flink.streaming.api.datastream.DataStream; +import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; +import org.apache.flink.streaming.api.functions.source.RichSourceFunction; +import org.apache.flink.table.data.RowData; +import org.apache.flink.util.Preconditions; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.ArrayList; +import java.util.List; +import java.util.NavigableMap; +import java.util.OptionalLong; +import java.util.TreeMap; + +/** + * This is the single (non-parallel) monitoring task, it is responsible for: + * + * <ol> + * <li>Monitoring snapshots of the Paimon table. + * <li>Creating the {@link Split splits} corresponding to the incremental files + * <li>Assigning them to downstream tasks for further processing. + * </ol> + * + * <p>The splits to be read are forwarded to the downstream {@link ReadOperator} which can have + * parallelism greater than one. + */ +public class MonitorFunction extends RichSourceFunction<Split> + implements CheckpointedFunction, CheckpointListener { + + private static final long serialVersionUID = 1L; + + private static final Logger LOG = LoggerFactory.getLogger(MonitorFunction.class); + + private final ReadBuilder readBuilder; + private final long monitorInterval; + + private volatile boolean isRunning = true; + + private transient StreamTableScan scan; + private transient SourceContext<Split> ctx; + + private transient ListState<Long> checkpointState; + private transient ListState<Tuple2<Long, Long>> nextSnapshotState; + private transient TreeMap<Long, Long> nextSnapshotPerCheckpoint; + + public MonitorFunction(ReadBuilder readBuilder, long monitorInterval) { + this.readBuilder = readBuilder; + this.monitorInterval = monitorInterval; + } + + @Override + public void initializeState(FunctionInitializationContext context) throws Exception { + this.scan = readBuilder.newStreamScan(); + + this.checkpointState = + context.getOperatorStateStore() + .getListState( + new ListStateDescriptor<>( + "next-snapshot", LongSerializer.INSTANCE)); + + @SuppressWarnings("unchecked") + final Class<Tuple2<Long, Long>> typedTuple = + (Class<Tuple2<Long, Long>>) (Class<?>) Tuple2.class; + this.nextSnapshotState = + context.getOperatorStateStore() + .getListState( + new ListStateDescriptor<>( + "next-snapshot-per-checkpoint", + new TupleSerializer<>( + typedTuple, + new TypeSerializer[] { + LongSerializer.INSTANCE, LongSerializer.INSTANCE + }))); + + this.nextSnapshotPerCheckpoint = new TreeMap<>(); + + if (context.isRestored()) { + LOG.info("Restoring state for the {}.", getClass().getSimpleName()); + + List<Long> retrievedStates = new ArrayList<>(); + for (Long entry : this.checkpointState.get()) { + retrievedStates.add(entry); + } + + // given that the parallelism of the function is 1, we can only have 1 retrieved items. + + Preconditions.checkArgument( + retrievedStates.size() <= 1, + getClass().getSimpleName() + " retrieved invalid state."); + + if (retrievedStates.size() == 1) { + this.scan.restore(retrievedStates.get(0)); Review Comment: Should we need to restore scan with the snapshot id in state or in consume-id file here? -- This is an automated message from the Apache Git Service. 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