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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.persistent;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.cluster.node.tasks.cancel.CancelTasksRequest;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.tasks.CancellableTask;
import org.elasticsearch.tasks.TaskId;
import org.elasticsearch.tasks.TaskManager;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Predicate;
/**
* Represents a executor node operation that corresponds to a persistent task
*/
public class AllocatedPersistentTask extends CancellableTask {
private final AtomicReference state;
private volatile String persistentTaskId;
private volatile long allocationId;
private volatile @Nullable Exception failure;
private volatile PersistentTasksService persistentTasksService;
private volatile Logger logger;
private volatile TaskManager taskManager;
public AllocatedPersistentTask(long id, String type, String action, String description, TaskId parentTask,
Map headers) {
super(id, type, action, description, parentTask, headers);
this.state = new AtomicReference<>(State.STARTED);
}
@Override
public boolean shouldCancelChildrenOnCancellation() {
return true;
}
// In case of persistent tasks we always need to return: `false`
// because in case of persistent task the parent task isn't a task in the task manager, but in cluster state.
// This instructs the task manager not to try to kill this persistent task when the task manager cannot find
// a fake parent node id "cluster" in the cluster state
@Override
public final boolean cancelOnParentLeaving() {
return false;
}
@Override
public Status getStatus() {
return new PersistentTasksNodeService.Status(state.get());
}
/**
* Updates the persistent state for the corresponding persistent task.
*
* This doesn't affect the status of this allocated task.
*/
public void updatePersistentTaskState(final PersistentTaskState state,
final ActionListener> listener) {
persistentTasksService.sendUpdateStateRequest(persistentTaskId, allocationId, state, listener);
}
public String getPersistentTaskId() {
return persistentTaskId;
}
void init(PersistentTasksService persistentTasksService, TaskManager taskManager, Logger logger, String persistentTaskId, long
allocationId) {
this.persistentTasksService = persistentTasksService;
this.logger = logger;
this.taskManager = taskManager;
this.persistentTaskId = persistentTaskId;
this.allocationId = allocationId;
}
public Exception getFailure() {
return failure;
}
public long getAllocationId() {
return allocationId;
}
/**
* Waits for a given persistent task to comply with a given predicate, then call back the listener accordingly.
*
* @param predicate the persistent task predicate to evaluate
* @param timeout a timeout for waiting
* @param listener the callback listener
*/
public void waitForPersistentTask(final Predicate> predicate,
final @Nullable TimeValue timeout,
final PersistentTasksService.WaitForPersistentTaskListener listener) {
persistentTasksService.waitForPersistentTaskCondition(persistentTaskId, predicate, timeout, listener);
}
protected final boolean isCompleted() {
return state.get() == State.COMPLETED;
}
boolean markAsCancelled() {
return state.compareAndSet(State.STARTED, State.PENDING_CANCEL);
}
public void markAsCompleted() {
completeAndNotifyIfNeeded(null);
}
public void markAsFailed(Exception e) {
if (CancelTasksRequest.DEFAULT_REASON.equals(getReasonCancelled())) {
completeAndNotifyIfNeeded(null);
} else {
completeAndNotifyIfNeeded(e);
}
}
private void completeAndNotifyIfNeeded(@Nullable Exception failure) {
final State prevState = state.getAndSet(State.COMPLETED);
if (prevState == State.COMPLETED) {
logger.warn("attempt to complete task [{}] with id [{}] in the [{}] state", getAction(), getPersistentTaskId(), prevState);
} else {
if (failure != null) {
logger.warn(() -> new ParameterizedMessage("task {} failed with an exception", getPersistentTaskId()), failure);
}
try {
this.failure = failure;
if (prevState == State.STARTED) {
logger.trace("sending notification for completed task [{}] with id [{}]", getAction(), getPersistentTaskId());
persistentTasksService.sendCompletionRequest(getPersistentTaskId(), getAllocationId(), failure, new
ActionListener>() {
@Override
public void onResponse(PersistentTasksCustomMetaData.PersistentTask persistentTask) {
logger.trace("notification for task [{}] with id [{}] was successful", getAction(),
getPersistentTaskId());
}
@Override
public void onFailure(Exception e) {
logger.warn(() -> new ParameterizedMessage(
"notification for task [{}] with id [{}] failed", getAction(), getPersistentTaskId()), e);
}
});
}
} finally {
taskManager.unregister(this);
}
}
}
public enum State {
STARTED, // the task is currently running
PENDING_CANCEL, // the task is cancelled on master, cancelling it locally
COMPLETED // the task is done running and trying to notify caller
}
}