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/*
 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.flink.runtime.checkpoint;

import org.apache.flink.runtime.jobgraph.JobVertexID;

import javax.annotation.Nullable;
import java.util.HashMap;
import java.util.Map;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * Statistics for a pending checkpoint that is still in progress.
 *
 * 

This is the starting point for all checkpoint tracking. The life cycle * of instances of this class is tightly coupled to a {@link PendingCheckpoint} * instance, which forwards statistics about acknowledged subtasks * via {@link #reportSubtaskStats(JobVertexID, SubtaskStateStats)}. * *

Depending on whether the {@link PendingCheckpoint} is finalized * successfully or aborted, we replace ourselves with a {@link CompletedCheckpointStats} * or {@link FailedCheckpointStats} and notify the {@link CheckpointStatsTracker}. * *

The statistics gathered here are all live updated. */ public class PendingCheckpointStats extends AbstractCheckpointStats { private static final long serialVersionUID = -973959257699390327L; /** Tracker callback when the pending checkpoint is finalized or aborted. */ private transient final CheckpointStatsTracker.PendingCheckpointStatsCallback trackerCallback; /** The current number of acknowledged subtasks. */ private volatile int currentNumAcknowledgedSubtasks; /** Current checkpoint state size over all collected subtasks. */ private volatile long currentStateSize; /** Current buffered bytes during alignment over all collected subtasks. */ private volatile long currentAlignmentBuffered; /** Stats of the latest acknowledged subtask. */ private volatile SubtaskStateStats latestAcknowledgedSubtask; /** * Creates a tracker for a {@link PendingCheckpoint}. * * @param checkpointId ID of the checkpoint. * @param triggerTimestamp Timestamp when the checkpoint was triggered. * @param props Checkpoint properties of the checkpoint. * @param totalSubtaskCount Total number of subtasks for the checkpoint. * @param taskStats Task stats for each involved operator. * @param trackerCallback Callback for the {@link CheckpointStatsTracker}. */ PendingCheckpointStats( long checkpointId, long triggerTimestamp, CheckpointProperties props, int totalSubtaskCount, Map taskStats, CheckpointStatsTracker.PendingCheckpointStatsCallback trackerCallback) { super(checkpointId, triggerTimestamp, props, totalSubtaskCount, taskStats); this.trackerCallback = checkNotNull(trackerCallback); } @Override public CheckpointStatsStatus getStatus() { return CheckpointStatsStatus.IN_PROGRESS; } @Override public int getNumberOfAcknowledgedSubtasks() { return currentNumAcknowledgedSubtasks; } @Override public long getStateSize() { return currentStateSize; } @Override public long getAlignmentBuffered() { return currentAlignmentBuffered; } @Override public SubtaskStateStats getLatestAcknowledgedSubtaskStats() { return latestAcknowledgedSubtask; } // ------------------------------------------------------------------------ // Callbacks from the PendingCheckpoint instance // ------------------------------------------------------------------------ /** * Reports statistics for a single subtask. * * @param jobVertexId ID of the task/operator the subtask belongs to. * @param subtask The statistics for the subtask. * @return true if successfully reported or false otherwise. */ boolean reportSubtaskStats(JobVertexID jobVertexId, SubtaskStateStats subtask) { TaskStateStats taskStateStats = taskStats.get(jobVertexId); if (taskStateStats != null && taskStateStats.reportSubtaskStats(subtask)) { currentNumAcknowledgedSubtasks++; latestAcknowledgedSubtask = subtask; currentStateSize += subtask.getStateSize(); long alignmentBuffered = subtask.getAlignmentBuffered(); if (alignmentBuffered > 0) { currentAlignmentBuffered += alignmentBuffered; } return true; } else { return false; } } /** * Reports a successfully completed pending checkpoint. * * @param externalPointer Optional external storage path if checkpoint was externalized. * @return Callback for the {@link CompletedCheckpoint} instance to notify about disposal. */ CompletedCheckpointStats.DiscardCallback reportCompletedCheckpoint(String externalPointer) { CompletedCheckpointStats completed = new CompletedCheckpointStats( checkpointId, triggerTimestamp, props, numberOfSubtasks, new HashMap<>(taskStats), currentNumAcknowledgedSubtasks, currentStateSize, currentAlignmentBuffered, latestAcknowledgedSubtask, externalPointer); trackerCallback.reportCompletedCheckpoint(completed); return completed.getDiscardCallback(); } /** * Reports a failed pending checkpoint. * * @param failureTimestamp Timestamp of the failure. * @param cause Optional cause of the failure. */ void reportFailedCheckpoint(long failureTimestamp, @Nullable Throwable cause) { FailedCheckpointStats failed = new FailedCheckpointStats( checkpointId, triggerTimestamp, props, numberOfSubtasks, new HashMap<>(taskStats), currentNumAcknowledgedSubtasks, currentStateSize, currentAlignmentBuffered, failureTimestamp, latestAcknowledgedSubtask, cause); trackerCallback.reportFailedCheckpoint(failed); } @Override public String toString() { return "PendingCheckpoint(id=" + getCheckpointId() + ")"; } }





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