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/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.indexing.overlord.supervisor;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.inject.Inject;
import com.metamx.emitter.EmittingLogger;
import io.druid.indexing.overlord.DataSourceMetadata;
import io.druid.java.util.common.Pair;
import io.druid.java.util.common.collect.JavaCompatUtils;
import io.druid.java.util.common.lifecycle.LifecycleStart;
import io.druid.java.util.common.lifecycle.LifecycleStop;
import io.druid.metadata.MetadataSupervisorManager;
import javax.annotation.Nullable;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
/**
* Manages the creation and lifetime of {@link Supervisor}.
*/
public class SupervisorManager
{
private static final EmittingLogger log = new EmittingLogger(SupervisorManager.class);
private final MetadataSupervisorManager metadataSupervisorManager;
private final ConcurrentHashMap> supervisors = new ConcurrentHashMap<>();
private final Object lock = new Object();
private volatile boolean started = false;
@Inject
public SupervisorManager(MetadataSupervisorManager metadataSupervisorManager)
{
this.metadataSupervisorManager = metadataSupervisorManager;
}
public Set getSupervisorIds()
{
return JavaCompatUtils.keySet(supervisors);
}
public Optional getSupervisorSpec(String id)
{
Pair supervisor = supervisors.get(id);
return supervisor == null ? Optional.absent() : Optional.fromNullable(supervisor.rhs);
}
public boolean createOrUpdateAndStartSupervisor(SupervisorSpec spec)
{
Preconditions.checkState(started, "SupervisorManager not started");
Preconditions.checkNotNull(spec, "spec");
Preconditions.checkNotNull(spec.getId(), "spec.getId()");
synchronized (lock) {
Preconditions.checkState(started, "SupervisorManager not started");
possiblyStopAndRemoveSupervisorInternal(spec.getId(), false);
return createAndStartSupervisorInternal(spec, true);
}
}
public boolean stopAndRemoveSupervisor(String id)
{
Preconditions.checkState(started, "SupervisorManager not started");
Preconditions.checkNotNull(id, "id");
synchronized (lock) {
Preconditions.checkState(started, "SupervisorManager not started");
return possiblyStopAndRemoveSupervisorInternal(id, true);
}
}
@LifecycleStart
public void start()
{
Preconditions.checkState(!started, "SupervisorManager already started");
log.info("Loading stored supervisors from database");
synchronized (lock) {
Map supervisors = metadataSupervisorManager.getLatest();
for (String id : supervisors.keySet()) {
SupervisorSpec spec = supervisors.get(id);
if (!(spec instanceof NoopSupervisorSpec)) {
createAndStartSupervisorInternal(spec, false);
}
}
started = true;
}
}
@LifecycleStop
public void stop()
{
Preconditions.checkState(started, "SupervisorManager not started");
synchronized (lock) {
for (String id : JavaCompatUtils.keySet(supervisors)) {
try {
supervisors.get(id).lhs.stop(false);
}
catch (Exception e) {
log.warn(e, "Caught exception while stopping supervisor [%s]", id);
}
}
supervisors.clear();
started = false;
}
log.info("SupervisorManager stopped.");
}
public Map> getSupervisorHistory()
{
return metadataSupervisorManager.getAll();
}
public Optional getSupervisorStatus(String id)
{
Pair supervisor = supervisors.get(id);
return supervisor == null ? Optional.absent() : Optional.fromNullable(supervisor.lhs.getStatus());
}
public boolean resetSupervisor(String id, @Nullable DataSourceMetadata dataSourceMetadata)
{
Preconditions.checkState(started, "SupervisorManager not started");
Preconditions.checkNotNull(id, "id");
Pair supervisor = supervisors.get(id);
if (supervisor == null) {
return false;
}
supervisor.lhs.reset(dataSourceMetadata);
return true;
}
/**
* Stops a supervisor with a given id and then removes it from the list.
*
* Caller should have acquired [lock] before invoking this method to avoid contention with other threads that may be
* starting and stopping supervisors.
*
* @return true if a supervisor was stopped, false if there was no supervisor with this id
*/
private boolean possiblyStopAndRemoveSupervisorInternal(String id, boolean writeTombstone)
{
Pair pair = supervisors.get(id);
if (pair == null) {
return false;
}
if (writeTombstone) {
metadataSupervisorManager.insert(id, new NoopSupervisorSpec()); // where NoopSupervisorSpec is a tombstone
}
pair.lhs.stop(true);
supervisors.remove(id);
return true;
}
/**
* Creates a supervisor from the provided spec and starts it if there is not already a supervisor with that id.
*
* Caller should have acquired [lock] before invoking this method to avoid contention with other threads that may be
* starting and stopping supervisors.
*
* @return true if a new supervisor was created, false if there was already an existing supervisor with this id
*/
private boolean createAndStartSupervisorInternal(SupervisorSpec spec, boolean persistSpec)
{
String id = spec.getId();
if (supervisors.containsKey(id)) {
return false;
}
if (persistSpec) {
metadataSupervisorManager.insert(id, spec);
}
Supervisor supervisor = null;
try {
supervisor = spec.createSupervisor();
supervisor.start();
}
catch (Exception e) {
// Supervisor creation or start failed write tombstone only when trying to start a new supervisor
if (persistSpec) {
metadataSupervisorManager.insert(id, new NoopSupervisorSpec());
}
Throwables.propagate(e);
}
supervisors.put(id, Pair.of(supervisor, spec));
return true;
}
}
