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HBASE-21521 Expose master startup status via web UI
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hbase-server/src/main/java/org/apache/hadoop/hbase/monitoring/TaskGroup.java
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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.hadoop.hbase.monitoring; | ||
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| import java.util.Collection; | ||
| import java.util.Collections; | ||
| import java.util.concurrent.ConcurrentLinkedDeque; | ||
| import org.apache.yetus.audience.InterfaceAudience; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
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| /** | ||
| * The {@link TaskGroup} can be seen as a big {@link MonitoredTask}, which contains a list of sub | ||
| * monitored tasks. The monitored tasks in the group are still be managed by the | ||
| * {@link TaskMonitor}, but whether to clear/expire the monitored tasks in a task group is optional. | ||
| * Since the monitored task already has journals, which mark the phases in a task, we still also | ||
| * need a task group to monitor a big task/process because the journals in a task is serial but the | ||
| * tasks in the task group can be parallel, then we have more flexible ability to monitor the | ||
| * process. Grouping the tasks is not strictly necessary but it is cleaner for presentation to | ||
| * operators. We might want to display the tasks in a group in a list view where each task can be | ||
| * collapsed (probably by default) or expanded. | ||
| */ | ||
| @InterfaceAudience.Private | ||
| public class TaskGroup extends MonitoredTaskImpl { | ||
| private static final Logger LOG = LoggerFactory.getLogger(TaskGroup.class); | ||
|
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| /** Sub-tasks in the group */ | ||
| private final ConcurrentLinkedDeque<MonitoredTask> tasks = new ConcurrentLinkedDeque<>(); | ||
|
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| /** Whether to be tracked(e.g. show/clear/expire) in the singleton {@link TaskMonitor} */ | ||
| private final boolean trackSubTasksInTaskMonitor; | ||
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|
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| /** Used to track this task group in {@link TaskMonitor} */ | ||
| private final MonitoredTask delegate; | ||
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| public TaskGroup(boolean trackSubTasksInTaskMonitor, String description) { | ||
| super(false, description); | ||
| this.trackSubTasksInTaskMonitor = trackSubTasksInTaskMonitor; | ||
| this.delegate = TaskMonitor.get().createStatus(description, true, true); | ||
| } | ||
|
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| public synchronized MonitoredTask addTask(String description) { | ||
| return addTask(description, true); | ||
| } | ||
|
|
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| /** | ||
| * Add a new task to the group, and before that might complete the last task in the group | ||
| * @param description the description of the new task | ||
| * @param withCompleteLast whether to complete the last task in the group | ||
| * @return the added new task | ||
| */ | ||
| public synchronized MonitoredTask addTask(String description, boolean withCompleteLast) { | ||
| if (withCompleteLast) { | ||
| MonitoredTask previousTask = this.tasks.peekLast(); | ||
| if ( | ||
| previousTask != null && previousTask.getState() != State.COMPLETE | ||
| && previousTask.getState() != State.ABORTED | ||
| ) { | ||
| previousTask.markComplete("Completed"); | ||
| } | ||
| } | ||
| MonitoredTask task = | ||
| TaskMonitor.get().createStatus(description, trackSubTasksInTaskMonitor, true); | ||
| this.setStatus(description); | ||
| this.tasks.addLast(task); | ||
| delegate.setStatus(description); | ||
| return task; | ||
| } | ||
|
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| public synchronized Collection<MonitoredTask> getTasks() { | ||
| return Collections.unmodifiableCollection(this.tasks); | ||
| } | ||
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| @Override | ||
| public synchronized void abort(String msg) { | ||
| setStatus(msg); | ||
| setState(State.ABORTED); | ||
| for (MonitoredTask task : tasks) { | ||
| if (task.getState() != State.COMPLETE && task.getState() != State.ABORTED) { | ||
| task.abort(msg); | ||
| } | ||
| } | ||
| delegate.abort(msg); | ||
| } | ||
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| @Override | ||
| public synchronized void markComplete(String msg) { | ||
| setState(State.COMPLETE); | ||
| setStatus(msg); | ||
| if (tasks.getLast() != null) { | ||
| tasks.getLast().markComplete(msg); | ||
| } | ||
| delegate.markComplete(msg); | ||
| } | ||
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| @Override | ||
| public synchronized void cleanup() { | ||
| this.tasks.clear(); | ||
| } | ||
| } |
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