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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,
* 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.stats;
import org.apache.flink.metrics.Gauge;
import org.apache.flink.metrics.MetricGroup;
import org.apache.flink.runtime.checkpoint.CompletedCheckpoint;
import org.apache.flink.runtime.checkpoint.SubtaskState;
import org.apache.flink.runtime.executiongraph.ExecutionJobVertex;
import org.apache.flink.runtime.checkpoint.TaskState;
import org.apache.flink.runtime.jobgraph.JobVertexID;
import scala.Option;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.apache.flink.util.Preconditions.checkArgument;
/**
* A simple checkpoint stats tracker.
*/
public class SimpleCheckpointStatsTracker implements CheckpointStatsTracker {
/** Lock guarding access to the stats */
private final Object statsLock = new Object();
/** The maximum number of recent checkpoint stats to remember. */
private final int historySize;
/** A bounded list of detailed stats. */
private final ArrayList history = new ArrayList<>();
/**
* Expected parallelism of tasks, which acknowledge checkpoints. Used for
* per sub task state size computation.
*/
private final Map taskParallelism;
/**
* Stats per operator. The long[parallelism][2], where [i][0] holds the
* duration, [i][1] the state size for sub task i of the operator.
*/
private Map subTaskStats;
/**
* Last computed job-specific statistic. Cleared on every completed
* checkpoint. And computed only on call to {@link #getJobStats()}.
*/
private JobCheckpointStats lastJobStats;
/**
* A map caching computed operator-specific statistics. Cleared on every
* completed checkpoint. And computed only on call to {@link #getOperatorStats(JobVertexID)}.
*/
private Map operatorStatsCache = new HashMap<>();
/**
* The total number of completed checkpoints. This does not always
* equal the last completed ID, because some checkpoints may have been
* cancelled after incrementing the ID counter.
*/
private long overallCount;
/** The minimum checkpoint completion duration (over all checkpoints). */
private long overallMinDuration = Long.MAX_VALUE;
/** The maximum checkpoint completion duration (over all checkpoints). */
private long overallMaxDuration = Long.MIN_VALUE;
/**
* The total checkpoint completion duration of all completed checkpoints.
* Used for computing the average duration.
*/
private long overallTotalDuration;
/** The minimum checkpoint state size (over all checkpoints). */
private long overallMinStateSize = Long.MAX_VALUE;
/** The maximum checkpoint state size (over all checkpoints). */
private long overallMaxStateSize = Long.MIN_VALUE;
/**
* The total checkpoint state size (over all checkpoints). Used for
* computing the overall average state size.
*/
private long overallTotalStateSize;
/**
* The latest completed checkpoint (highest ID) or null.
*/
private CompletedCheckpoint latestCompletedCheckpoint;
public SimpleCheckpointStatsTracker(
int historySize,
List tasksToWaitFor,
MetricGroup metrics) {
checkArgument(historySize >= 0);
this.historySize = historySize;
// We know upfront which tasks will ack the checkpoints
if (tasksToWaitFor != null && !tasksToWaitFor.isEmpty()) {
taskParallelism = new HashMap<>(tasksToWaitFor.size());
for (ExecutionJobVertex vertex : tasksToWaitFor) {
taskParallelism.put(vertex.getJobVertexId(), vertex.getParallelism());
}
} else {
taskParallelism = Collections.emptyMap();
}
metrics.gauge("lastCheckpointSize", new CheckpointSizeGauge());
metrics.gauge("lastCheckpointDuration", new CheckpointDurationGauge());
}
@Override
public void onCompletedCheckpoint(CompletedCheckpoint checkpoint) {
// Sanity check
if (taskParallelism.isEmpty()) {
return;
}
synchronized (statsLock) {
long overallStateSize = checkpoint.getStateSize();
// Operator stats
Map statsForSubTasks = new HashMap<>();
for (Map.Entry taskStateEntry: checkpoint.getTaskStates().entrySet()) {
JobVertexID jobVertexID = taskStateEntry.getKey();
TaskState taskState = taskStateEntry.getValue();
int parallelism = taskParallelism.get(jobVertexID);
long[][] statsPerSubtask = new long[parallelism][2];
statsForSubTasks.put(jobVertexID, statsPerSubtask);
for (int i = 0; i < Math.min(taskState.getParallelism(), parallelism); i++) {
SubtaskState subtaskState = taskState.getState(i);
if (subtaskState != null) {
statsPerSubtask[i][0] = subtaskState.getDuration();
statsPerSubtask[i][1] = subtaskState.getStateSize();
}
}
}
// It is possible that completed checkpoints are added out of
// order. Make sure that in this case the last completed
// checkpoint is not updated.
boolean isInOrder = latestCompletedCheckpoint != null &&
checkpoint.getCheckpointID() > latestCompletedCheckpoint.getCheckpointID();
// Clear this in each case
lastJobStats = null;
if (overallCount == 0 || isInOrder) {
latestCompletedCheckpoint = checkpoint;
// Clear cached stats
operatorStatsCache.clear();
// Update the stats per sub task
subTaskStats = statsForSubTasks;
}
long checkpointId = checkpoint.getCheckpointID();
long checkpointTriggerTimestamp = checkpoint.getTimestamp();
long checkpointDuration = checkpoint.getDuration();
overallCount++;
// Duration stats
if (checkpointDuration > overallMaxDuration) {
overallMaxDuration = checkpointDuration;
}
if (checkpointDuration < overallMinDuration) {
overallMinDuration = checkpointDuration;
}
overallTotalDuration += checkpointDuration;
// State size stats
if (overallStateSize < overallMinStateSize) {
overallMinStateSize = overallStateSize;
}
if (overallStateSize > overallMaxStateSize) {
overallMaxStateSize = overallStateSize;
}
this.overallTotalStateSize += overallStateSize;
// Recent history
if (historySize > 0) {
CheckpointStats stats = new CheckpointStats(
checkpointId,
checkpointTriggerTimestamp,
checkpointDuration,
overallStateSize);
if (isInOrder) {
if (history.size() == historySize) {
history.remove(0);
}
history.add(stats);
}
else {
final int size = history.size();
// Only remove it if it the new checkpoint is not too old
if (size == historySize) {
if (checkpointId > history.get(0).getCheckpointId()) {
history.remove(0);
}
}
int pos = 0;
// Find position
for (int i = 0; i < size; i++) {
pos = i;
if (checkpointId < history.get(i).getCheckpointId()) {
break;
}
}
history.add(pos, stats);
}
}
}
}
@SuppressWarnings("unchecked")
@Override
public Option getJobStats() {
synchronized (statsLock) {
if (lastJobStats != null) {
return Option.apply(lastJobStats);
}
else if (latestCompletedCheckpoint != null) {
long overallAverageDuration = overallCount == 0
? 0
: overallTotalDuration / overallCount;
long overallAverageStateSize = overallCount == 0
? 0
: overallTotalStateSize / overallCount;
lastJobStats = new JobCheckpointStatsSnapshot(
// Need to clone in order to have a consistent snapshot.
// We can safely update it afterwards.
(List) history.clone(),
overallCount,
overallMinDuration,
overallMaxDuration,
overallAverageDuration,
overallMinStateSize,
overallMaxStateSize,
overallAverageStateSize);
return Option.apply(lastJobStats);
}
else {
return Option.empty();
}
}
}
@Override
public Option getOperatorStats(JobVertexID operatorId) {
synchronized (statsLock) {
OperatorCheckpointStats stats = operatorStatsCache.get(operatorId);
if (stats != null) {
return Option.apply(stats);
}
else if (latestCompletedCheckpoint != null && subTaskStats != null) {
long[][] subTaskStats = this.subTaskStats.get(operatorId);
if (subTaskStats == null) {
return Option.empty();
}
else {
long maxDuration = Long.MIN_VALUE;
long stateSize = 0;
for (long[] subTaskStat : subTaskStats) {
if (subTaskStat[0] > maxDuration) {
maxDuration = subTaskStat[0];
}
stateSize += subTaskStat[1];
}
stats = new OperatorCheckpointStats(
latestCompletedCheckpoint.getCheckpointID(),
latestCompletedCheckpoint.getTimestamp(),
maxDuration,
stateSize,
subTaskStats);
// Remember this and don't recompute if requested again
operatorStatsCache.put(operatorId, stats);
return Option.apply(stats);
}
}
else {
return Option.empty();
}
}
}
// ------------------------------------------------------------------------
/**
* A snapshot of checkpoint stats.
*/
private static class JobCheckpointStatsSnapshot implements JobCheckpointStats {
// General
private final List recentHistory;
private final long count;
// Duration
private final long minDuration;
private final long maxDuration;
private final long averageDuration;
// State size
private final long minStateSize;
private final long maxStateSize;
private final long averageStateSize;
public JobCheckpointStatsSnapshot(
List recentHistory,
long count,
long minDuration,
long maxDuration,
long averageDuration,
long minStateSize,
long maxStateSize,
long averageStateSize) {
this.recentHistory = recentHistory;
this.count = count;
this.minDuration = minDuration;
this.maxDuration = maxDuration;
this.averageDuration = averageDuration;
this.minStateSize = minStateSize;
this.maxStateSize = maxStateSize;
this.averageStateSize = averageStateSize;
}
@Override
public List getRecentHistory() {
return recentHistory;
}
@Override
public long getCount() {
return count;
}
@Override
public long getMinDuration() {
return minDuration;
}
@Override
public long getMaxDuration() {
return maxDuration;
}
@Override
public long getAverageDuration() {
return averageDuration;
}
@Override
public long getMinStateSize() {
return minStateSize;
}
@Override
public long getMaxStateSize() {
return maxStateSize;
}
@Override
public long getAverageStateSize() {
return averageStateSize;
}
}
private class CheckpointSizeGauge implements Gauge {
@Override
public Long getValue() {
return latestCompletedCheckpoint == null ? -1 : latestCompletedCheckpoint.getStateSize();
}
}
private class CheckpointDurationGauge implements Gauge {
@Override
public Long getValue() {
return latestCompletedCheckpoint == null ? -1 : latestCompletedCheckpoint.getDuration();
}
}
}
