pvary commented on code in PR #11010: URL: https://github.com/apache/iceberg/pull/11010#discussion_r1739164510
########## flink/v1.20/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/LockRemover.java: ########## @@ -0,0 +1,152 @@ +/* + * 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.maintenance.operator; + +import java.util.List; +import java.util.concurrent.atomic.AtomicLong; +import org.apache.flink.annotation.Internal; +import org.apache.flink.metrics.Counter; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.api.watermark.Watermark; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Manages locks and collect {@link org.apache.flink.metrics.Metric} for the Maintenance Tasks. + * + * <p>The assumptions about the locks are the following: + * + * <ul> + * <li>Every {@link TaskResult} is followed by a {@link Watermark} for normal {@link Trigger}s + * <li>For the {@link Trigger#recovery(long)} {@link Watermark} there is no element to process + * </ul> + * + * When processing the inputs there are 3 possibilities: + * + * <ul> + * <li>Normal execution - we receive a {@link TaskResult} and then a {@link Watermark} - unlocking + * the lock is handled by the {@link #processElement(StreamRecord)} + * <li>Recovery without ongoing execution (unlocking the recoveryLock) - we receive the {@link + * Trigger#recovery(long)} {@link Watermark} without any {@link TaskResult} - unlocking the + * {@link TriggerLockFactory#createRecoveryLock()} and a possible {@link + * TriggerLockFactory#createLock()} is handled by the {@link #processWatermark(Watermark)} + * (the {@link #lastProcessedTaskStartEpoch} is 0 in this case) + * <li>Recovery with an ongoing execution - we receive a {@link TaskResult} and then a {@link + * Watermark} - unlocking the {@link TriggerLockFactory#createLock()} is handled by the {@link + * #processElement(StreamRecord)}, unlocking the {@link + * TriggerLockFactory#createRecoveryLock()} is handled by the {@link + * #processWatermark(Watermark)} (the {@link #lastProcessedTaskStartEpoch} is the start time + * of the old task) + * </ul> + */ +@Internal +public class LockRemover extends AbstractStreamOperator<MaintenanceResult> + implements OneInputStreamOperator<TaskResult, MaintenanceResult> { + private static final Logger LOG = LoggerFactory.getLogger(LockRemover.class); + + private final TriggerLockFactory lockFactory; + private final List<String> maintenanceTaskNames; + + private transient List<Counter> succeededTaskResultCounters; + private transient List<Counter> failedTaskResultCounters; + private transient List<AtomicLong> taskLastRunDurationMs; + private transient TriggerLockFactory.Lock lock; + private transient TriggerLockFactory.Lock recoveryLock; + private transient long lastProcessedTaskStartEpoch = 0L; + + public LockRemover(TriggerLockFactory lockFactory, List<String> maintenanceTaskNames) { + Preconditions.checkNotNull(lockFactory, "Lock factory should no be null"); + Preconditions.checkArgument( + maintenanceTaskNames != null && !maintenanceTaskNames.isEmpty(), + "Invalid maintenance task names: null or empty"); + + this.lockFactory = lockFactory; + this.maintenanceTaskNames = maintenanceTaskNames; + } + + @Override + public void open() throws Exception { + super.open(); + this.succeededTaskResultCounters = + Lists.newArrayListWithExpectedSize(maintenanceTaskNames.size()); + this.failedTaskResultCounters = Lists.newArrayListWithExpectedSize(maintenanceTaskNames.size()); + this.taskLastRunDurationMs = Lists.newArrayListWithExpectedSize(maintenanceTaskNames.size()); + for (String name : maintenanceTaskNames) { + succeededTaskResultCounters.add( + getRuntimeContext() + .getMetricGroup() + .addGroup(TableMaintenanceMetrics.GROUP_KEY, name) + .counter(TableMaintenanceMetrics.SUCCEEDED_TASK_COUNTER)); + failedTaskResultCounters.add( + getRuntimeContext() + .getMetricGroup() + .addGroup(TableMaintenanceMetrics.GROUP_KEY, name) + .counter(TableMaintenanceMetrics.FAILED_TASK_COUNTER)); + AtomicLong length = new AtomicLong(0); + taskLastRunDurationMs.add(length); + getRuntimeContext() + .getMetricGroup() + .addGroup(TableMaintenanceMetrics.GROUP_KEY, name) + .gauge(TableMaintenanceMetrics.LAST_RUN_DURATION_MS, length::get); + } + + this.lock = lockFactory.createLock(); + this.recoveryLock = lockFactory.createRecoveryLock(); + } + + @Override + public void processElement(StreamRecord<TaskResult> streamRecord) { + TaskResult taskResult = streamRecord.getValue(); + LOG.info( + "Processing result {} for task {}", + taskResult, + maintenanceTaskNames.get(taskResult.taskIndex())); + long duration = System.currentTimeMillis() - taskResult.startEpoch(); + output.collect( + new StreamRecord<>( + new MaintenanceResult( + taskResult.startEpoch(), + taskResult.taskIndex(), + duration, + taskResult.success(), + taskResult.exceptions()))); + lock.unlock(); Review Comment: You can check the Locking paragraph in the design doc: https://docs.google.com/document/d/16g3vR18mVBy8jbFaLjf2JwAANuYOmIwr15yDDxovdnA If you still have questions, feel free to ask -- This is an automated message from the Apache Git Service. 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