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* (the "License"); you may not use this file except in compliance with
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* http://www.apache.org/licenses/LICENSE-2.0
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* 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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package org.apache.flink.runtime.checkpoint;
import org.apache.flink.api.common.JobID;
import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
import org.apache.flink.util.ExceptionUtils;
import org.apache.flink.util.FlinkRuntimeException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Consumer;
import static org.apache.flink.util.Preconditions.checkArgument;
import static org.apache.flink.util.Preconditions.checkNotNull;
/** The checkpoint failure manager which centralized manage checkpoint failure processing logic. */
public class CheckpointFailureManager {
private static final Logger LOG = LoggerFactory.getLogger(CheckpointFailureManager.class);
public static final int UNLIMITED_TOLERABLE_FAILURE_NUMBER = Integer.MAX_VALUE;
public static final String EXCEEDED_CHECKPOINT_TOLERABLE_FAILURE_MESSAGE =
"Exceeded checkpoint tolerable failure threshold.";
private static final int UNKNOWN_CHECKPOINT_ID = -1;
private final int tolerableCpFailureNumber;
private final FailJobCallback failureCallback;
private final AtomicInteger continuousFailureCounter;
private final Set countedCheckpointIds;
private long lastSucceededCheckpointId = Long.MIN_VALUE;
public CheckpointFailureManager(int tolerableCpFailureNumber, FailJobCallback failureCallback) {
checkArgument(
tolerableCpFailureNumber >= 0,
"The tolerable checkpoint failure number is illegal, "
+ "it must be greater than or equal to 0 .");
this.tolerableCpFailureNumber = tolerableCpFailureNumber;
this.continuousFailureCounter = new AtomicInteger(0);
this.failureCallback = checkNotNull(failureCallback);
this.countedCheckpointIds = ConcurrentHashMap.newKeySet();
}
/**
* Failures on JM:
*
*
* - all checkpoints - go against failure counter.
*
- any savepoints - don’t do anything, manual action, the failover will not help anyway.
*
*
* Failures on TM:
*
*
* - all checkpoints - go against failure counter (failover might help and we want to notify
* users).
*
- sync savepoints - we must always fail, otherwise we risk deadlock when the job
* cancelation waiting for finishing savepoint which never happens.
*
- non sync savepoints - go against failure counter (failover might help solve the
* problem).
*
*
* @param pendingCheckpoint the failed checkpoint if it was initialized already.
* @param checkpointProperties the checkpoint properties in order to determinate which handle
* strategy can be used.
* @param exception the checkpoint exception.
* @param executionAttemptID the execution attempt id, as a safe guard.
* @param job the JobID.
* @param pendingCheckpointStats the pending checkpoint statistics.
* @param statsTracker the tracker for checkpoint statistics.
*/
public void handleCheckpointException(
@Nullable PendingCheckpoint pendingCheckpoint,
CheckpointProperties checkpointProperties,
CheckpointException exception,
@Nullable ExecutionAttemptID executionAttemptID,
JobID job,
@Nullable PendingCheckpointStats pendingCheckpointStats,
CheckpointStatsTracker statsTracker) {
long checkpointId =
pendingCheckpoint == null
? UNKNOWN_CHECKPOINT_ID
: pendingCheckpoint.getCheckpointID();
updateStatsAfterCheckpointFailed(pendingCheckpointStats, statsTracker, exception);
if (CheckpointFailureReason.NOT_ALL_REQUIRED_TASKS_RUNNING.equals(
exception.getCheckpointFailureReason())) {
LOG.info(
"Failed to trigger checkpoint for job {} since {}.",
job,
exception.getMessage());
} else {
LOG.warn(
"Failed to trigger or complete checkpoint {} for job {}. ({} consecutive failed attempts so far)",
checkpointId == UNKNOWN_CHECKPOINT_ID ? "UNKNOWN_CHECKPOINT_ID" : checkpointId,
job,
continuousFailureCounter.get(),
exception);
}
if (isJobManagerFailure(exception, executionAttemptID)) {
handleJobLevelCheckpointException(checkpointProperties, exception, checkpointId);
} else {
handleTaskLevelCheckpointException(
checkNotNull(pendingCheckpoint), exception, checkNotNull(executionAttemptID));
}
}
/**
* Updating checkpoint statistics after checkpoint failed.
*
* @param pendingCheckpointStats the pending checkpoint statistics.
* @param exception the checkpoint exception.
*/
private void updateStatsAfterCheckpointFailed(
@Nullable PendingCheckpointStats pendingCheckpointStats,
CheckpointStatsTracker statsTracker,
CheckpointException exception) {
if (pendingCheckpointStats != null) {
long failureTimestamp = System.currentTimeMillis();
statsTracker.reportFailedCheckpoint(
pendingCheckpointStats.toFailedCheckpoint(failureTimestamp, exception));
} else {
statsTracker.reportFailedCheckpointsWithoutInProgress();
}
}
private boolean isJobManagerFailure(
CheckpointException exception, @Nullable ExecutionAttemptID executionAttemptID) {
// TODO: Try to get rid of checking nullability of executionAttemptID because false value of
// isPreFlightFailure should guarantee that executionAttemptID is always not null.
return isPreFlightFailure(exception) || executionAttemptID == null;
}
/**
* Handle job level checkpoint exception with a handler callback.
*
* @param exception the checkpoint exception.
* @param checkpointId the failed checkpoint id used to count the continuous failure number
* based on checkpoint id sequence. In trigger phase, we may not get the checkpoint id when
* the failure happens before the checkpoint id generation. In this case, it will be
* specified a negative latest generated checkpoint id as a special flag.
*/
void handleJobLevelCheckpointException(
CheckpointProperties checkpointProperties,
CheckpointException exception,
long checkpointId) {
if (!checkpointProperties.isSavepoint()) {
checkFailureAgainstCounter(exception, checkpointId, failureCallback::failJob);
}
}
/**
* Handle task level checkpoint exception with a handler callback.
*
* @param pendingCheckpoint the failed checkpoint used to count the continuous failure number
* based on checkpoint id sequence. In trigger phase, we may not get the checkpoint id when
* the failure happens before the checkpoint id generation. In this case, it will be
* specified a negative latest generated checkpoint id as a special flag.
* @param exception the checkpoint exception.
* @param executionAttemptID the execution attempt id, as a safe guard.
*/
void handleTaskLevelCheckpointException(
PendingCheckpoint pendingCheckpoint,
CheckpointException exception,
ExecutionAttemptID executionAttemptID) {
CheckpointProperties checkpointProps = pendingCheckpoint.getProps();
if (checkpointProps.isSavepoint() && checkpointProps.isSynchronous()) {
failureCallback.failJob(exception);
} else {
checkFailureAgainstCounter(
exception,
pendingCheckpoint.getCheckpointID(),
e -> failureCallback.failJobDueToTaskFailure(e, executionAttemptID));
}
}
private void checkFailureAgainstCounter(
CheckpointException exception,
long checkpointId,
Consumer errorHandler) {
if (checkpointId == UNKNOWN_CHECKPOINT_ID || checkpointId > lastSucceededCheckpointId) {
checkFailureCounter(exception, checkpointId);
if (continuousFailureCounter.get() > tolerableCpFailureNumber) {
clearCount();
String exceptionMessage =
String.format(
"%s The latest checkpoint failed due to %s, view the Checkpoint History tab"
+ " or the Job Manager log to find out why continuous checkpoints failed.",
EXCEEDED_CHECKPOINT_TOLERABLE_FAILURE_MESSAGE,
exception.getCheckpointFailureReason().message());
errorHandler.accept(new FlinkRuntimeException(exceptionMessage));
}
}
}
public void checkFailureCounter(CheckpointException exception, long checkpointId) {
if (tolerableCpFailureNumber == UNLIMITED_TOLERABLE_FAILURE_NUMBER) {
return;
}
CheckpointFailureReason reason = exception.getCheckpointFailureReason();
switch (reason) {
case PERIODIC_SCHEDULER_SHUTDOWN:
case TOO_MANY_CHECKPOINT_REQUESTS:
case MINIMUM_TIME_BETWEEN_CHECKPOINTS:
case NOT_ALL_REQUIRED_TASKS_RUNNING:
case CHECKPOINT_SUBSUMED:
case CHECKPOINT_COORDINATOR_SUSPEND:
case CHECKPOINT_COORDINATOR_SHUTDOWN:
case CHANNEL_STATE_SHARED_STREAM_EXCEPTION:
case JOB_FAILOVER_REGION:
// for compatibility purposes with user job behavior
case CHECKPOINT_DECLINED_TASK_NOT_READY:
case CHECKPOINT_DECLINED_TASK_CLOSING:
case CHECKPOINT_DECLINED_ON_CANCELLATION_BARRIER:
case CHECKPOINT_DECLINED_SUBSUMED:
case CHECKPOINT_DECLINED_INPUT_END_OF_STREAM:
case TASK_FAILURE:
case TASK_CHECKPOINT_FAILURE:
case UNKNOWN_TASK_CHECKPOINT_NOTIFICATION_FAILURE:
// there are some edge cases shouldn't be counted as a failure, e.g. shutdown
case TRIGGER_CHECKPOINT_FAILURE:
case BLOCKING_OUTPUT_EXIST:
// ignore
break;
case IO_EXCEPTION:
case CHECKPOINT_ASYNC_EXCEPTION:
case CHECKPOINT_DECLINED:
case CHECKPOINT_EXPIRED:
case FINALIZE_CHECKPOINT_FAILURE:
// we should make sure one checkpoint only be counted once
if (checkpointId == UNKNOWN_CHECKPOINT_ID
|| countedCheckpointIds.add(checkpointId)) {
continuousFailureCounter.incrementAndGet();
}
break;
default:
throw new FlinkRuntimeException(
"Unknown checkpoint failure reason : " + reason.name());
}
}
/**
* Handle checkpoint success.
*
* @param checkpointId the failed checkpoint id used to count the continuous failure number
* based on checkpoint id sequence.
*/
public void handleCheckpointSuccess(long checkpointId) {
if (checkpointId > lastSucceededCheckpointId) {
lastSucceededCheckpointId = checkpointId;
clearCount();
}
}
private void clearCount() {
continuousFailureCounter.set(0);
countedCheckpointIds.clear();
}
private static boolean isPreFlightFailure(final Throwable cause) {
return ExceptionUtils.findThrowable(cause, CheckpointException.class)
.map(CheckpointException::getCheckpointFailureReason)
.map(CheckpointFailureReason::isPreFlight)
.orElse(false);
}
/** A callback interface about how to fail a job. */
public interface FailJobCallback {
/**
* Fails the whole job graph.
*
* @param cause The reason why the synchronous savepoint fails.
*/
void failJob(final Throwable cause);
/**
* Fails the whole job graph due to task failure.
*
* @param cause The reason why the job is cancelled.
* @param failingTask The id of the failing task attempt to prevent failing the job multiple
* times.
*/
void failJobDueToTaskFailure(final Throwable cause, final ExecutionAttemptID failingTask);
}
}
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