public class ClusterService extends AbstractLifecycleComponent {
public static final Setting<TimeValue> CLUSTER_SERVICE_SLOW_TASK_LOGGING_THRESHOLD_SETTING =
Setting.positiveTimeSetting(
"cluster.service.slow_task_logging_threshold",
TimeValue.timeValueSeconds(30),
Property.Dynamic,
Property.NodeScope);
public static final String UPDATE_THREAD_NAME = "clusterService#updateTask";
private final ThreadPool threadPool;
private final ClusterName clusterName;
private BiConsumer<ClusterChangedEvent, Discovery.AckListener> clusterStatePublisher;
private final OperationRouting operationRouting;
private final ClusterSettings clusterSettings;
private TimeValue slowTaskLoggingThreshold;
private volatile PrioritizedEsThreadPoolExecutor updateTasksExecutor;
/** Those 3 state listeners are changing infrequently - CopyOnWriteArrayList is just fine */
private final Collection<ClusterStateListener> priorityClusterStateListeners =
new CopyOnWriteArrayList<>();
private final Collection<ClusterStateListener> clusterStateListeners =
new CopyOnWriteArrayList<>();
private final Collection<ClusterStateListener> lastClusterStateListeners =
new CopyOnWriteArrayList<>();
private final Map<ClusterStateTaskExecutor, List<UpdateTask>> updateTasksPerExecutor =
new HashMap<>();
// TODO this is rather frequently changing I guess a Synced Set would be better here and a
// dedicated remove API
private final Collection<ClusterStateListener> postAppliedListeners =
new CopyOnWriteArrayList<>();
private final Iterable<ClusterStateListener> preAppliedListeners =
Iterables.concat(
priorityClusterStateListeners, clusterStateListeners, lastClusterStateListeners);
private final LocalNodeMasterListeners localNodeMasterListeners;
private final Queue<NotifyTimeout> onGoingTimeouts = ConcurrentCollections.newQueue();
private volatile ClusterState clusterState;
private final ClusterBlocks.Builder initialBlocks;
private NodeConnectionsService nodeConnectionsService;
public ClusterService(Settings settings, ClusterSettings clusterSettings, ThreadPool threadPool) {
super(settings);
this.operationRouting = new OperationRouting(settings, clusterSettings);
this.threadPool = threadPool;
this.clusterSettings = clusterSettings;
this.clusterName = ClusterName.CLUSTER_NAME_SETTING.get(settings);
// will be replaced on doStart.
this.clusterState = ClusterState.builder(clusterName).build();
this.clusterSettings.addSettingsUpdateConsumer(
CLUSTER_SERVICE_SLOW_TASK_LOGGING_THRESHOLD_SETTING, this::setSlowTaskLoggingThreshold);
this.slowTaskLoggingThreshold =
CLUSTER_SERVICE_SLOW_TASK_LOGGING_THRESHOLD_SETTING.get(settings);
localNodeMasterListeners = new LocalNodeMasterListeners(threadPool);
initialBlocks = ClusterBlocks.builder();
}
private void setSlowTaskLoggingThreshold(TimeValue slowTaskLoggingThreshold) {
this.slowTaskLoggingThreshold = slowTaskLoggingThreshold;
}
public synchronized void setClusterStatePublisher(
BiConsumer<ClusterChangedEvent, Discovery.AckListener> publisher) {
clusterStatePublisher = publisher;
}
public synchronized void setLocalNode(DiscoveryNode localNode) {
assert clusterState.nodes().getLocalNodeId() == null : "local node is already set";
DiscoveryNodes.Builder nodeBuilder =
DiscoveryNodes.builder(clusterState.nodes()).add(localNode).localNodeId(localNode.getId());
this.clusterState = ClusterState.builder(clusterState).nodes(nodeBuilder).build();
}
public synchronized void setNodeConnectionsService(
NodeConnectionsService nodeConnectionsService) {
assert this.nodeConnectionsService == null : "nodeConnectionsService is already set";
this.nodeConnectionsService = nodeConnectionsService;
}
/** Adds an initial block to be set on the first cluster state created. */
public synchronized void addInitialStateBlock(ClusterBlock block) throws IllegalStateException {
if (lifecycle.started()) {
throw new IllegalStateException("can't set initial block when started");
}
initialBlocks.addGlobalBlock(block);
}
/** Remove an initial block to be set on the first cluster state created. */
public synchronized void removeInitialStateBlock(ClusterBlock block)
throws IllegalStateException {
removeInitialStateBlock(block.id());
}
/** Remove an initial block to be set on the first cluster state created. */
public synchronized void removeInitialStateBlock(int blockId) throws IllegalStateException {
if (lifecycle.started()) {
throw new IllegalStateException("can't set initial block when started");
}
initialBlocks.removeGlobalBlock(blockId);
}
@Override
protected synchronized void doStart() {
Objects.requireNonNull(
clusterStatePublisher, "please set a cluster state publisher before starting");
Objects.requireNonNull(
clusterState.nodes().getLocalNode(), "please set the local node before starting");
Objects.requireNonNull(
nodeConnectionsService, "please set the node connection service before starting");
add(localNodeMasterListeners);
this.clusterState = ClusterState.builder(clusterState).blocks(initialBlocks).build();
this.updateTasksExecutor =
EsExecutors.newSinglePrioritizing(
UPDATE_THREAD_NAME,
daemonThreadFactory(settings, UPDATE_THREAD_NAME),
threadPool.getThreadContext());
this.clusterState = ClusterState.builder(clusterState).blocks(initialBlocks).build();
}
@Override
protected synchronized void doStop() {
for (NotifyTimeout onGoingTimeout : onGoingTimeouts) {
onGoingTimeout.cancel();
try {
onGoingTimeout.cancel();
onGoingTimeout.listener.onClose();
} catch (Exception ex) {
logger.debug("failed to notify listeners on shutdown", ex);
}
}
ThreadPool.terminate(updateTasksExecutor, 10, TimeUnit.SECONDS);
// close timeout listeners that did not have an ongoing timeout
postAppliedListeners
.stream()
.filter(listener -> listener instanceof TimeoutClusterStateListener)
.map(listener -> (TimeoutClusterStateListener) listener)
.forEach(TimeoutClusterStateListener::onClose);
remove(localNodeMasterListeners);
}
@Override
protected synchronized void doClose() {}
/** The local node. */
public DiscoveryNode localNode() {
DiscoveryNode localNode = clusterState.getNodes().getLocalNode();
if (localNode == null) {
throw new IllegalStateException("No local node found. Is the node started?");
}
return localNode;
}
public OperationRouting operationRouting() {
return operationRouting;
}
/** The current state. */
public ClusterState state() {
return this.clusterState;
}
/** Adds a priority listener for updated cluster states. */
public void addFirst(ClusterStateListener listener) {
priorityClusterStateListeners.add(listener);
}
/** Adds last listener. */
public void addLast(ClusterStateListener listener) {
lastClusterStateListeners.add(listener);
}
/** Adds a listener for updated cluster states. */
public void add(ClusterStateListener listener) {
clusterStateListeners.add(listener);
}
/** Removes a listener for updated cluster states. */
public void remove(ClusterStateListener listener) {
clusterStateListeners.remove(listener);
priorityClusterStateListeners.remove(listener);
lastClusterStateListeners.remove(listener);
postAppliedListeners.remove(listener);
for (Iterator<NotifyTimeout> it = onGoingTimeouts.iterator(); it.hasNext(); ) {
NotifyTimeout timeout = it.next();
if (timeout.listener.equals(listener)) {
timeout.cancel();
it.remove();
}
}
}
/** Add a listener for on/off local node master events */
public void add(LocalNodeMasterListener listener) {
localNodeMasterListeners.add(listener);
}
/** Remove the given listener for on/off local master events */
public void remove(LocalNodeMasterListener listener) {
localNodeMasterListeners.remove(listener);
}
/**
* Adds a cluster state listener that will timeout after the provided timeout, and is executed
* after the clusterstate has been successfully applied ie. is in state {@link
* org.elasticsearch.cluster.ClusterState.ClusterStateStatus#APPLIED} NOTE: a {@code null} timeout
* means that the listener will never be removed automatically
*/
public void add(@Nullable final TimeValue timeout, final TimeoutClusterStateListener listener) {
if (lifecycle.stoppedOrClosed()) {
listener.onClose();
return;
}
// call the post added notification on the same event thread
try {
updateTasksExecutor.execute(
new SourcePrioritizedRunnable(Priority.HIGH, "_add_listener_") {
@Override
public void run() {
if (timeout != null) {
NotifyTimeout notifyTimeout = new NotifyTimeout(listener, timeout);
notifyTimeout.future =
threadPool.schedule(timeout, ThreadPool.Names.GENERIC, notifyTimeout);
onGoingTimeouts.add(notifyTimeout);
}
postAppliedListeners.add(listener);
listener.postAdded();
}
});
} catch (EsRejectedExecutionException e) {
if (lifecycle.stoppedOrClosed()) {
listener.onClose();
} else {
throw e;
}
}
}
/**
* Submits a cluster state update task; unlike {@link #submitStateUpdateTask(String, Object,
* ClusterStateTaskConfig, ClusterStateTaskExecutor, ClusterStateTaskListener)}, submitted updates
* will not be batched.
*
* @param source the source of the cluster state update task
* @param updateTask the full context for the cluster state update task
*/
public void submitStateUpdateTask(final String source, final ClusterStateUpdateTask updateTask) {
submitStateUpdateTask(source, updateTask, updateTask, updateTask, updateTask);
}
/**
* Submits a cluster state update task; submitted updates will be batched across the same instance
* of executor. The exact batching semantics depend on the underlying implementation but a rough
* guideline is that if the update task is submitted while there are pending update tasks for the
* same executor, these update tasks will all be executed on the executor in a single batch
*
* @param source the source of the cluster state update task
* @param task the state needed for the cluster state update task
* @param config the cluster state update task configuration
* @param executor the cluster state update task executor; tasks that share the same executor will
* be executed batches on this executor
* @param listener callback after the cluster state update task completes
* @param <T> the type of the cluster state update task state
*/
public <T> void submitStateUpdateTask(
final String source,
final T task,
final ClusterStateTaskConfig config,
final ClusterStateTaskExecutor<T> executor,
final ClusterStateTaskListener listener) {
submitStateUpdateTasks(source, Collections.singletonMap(task, listener), config, executor);
}
/**
* Submits a batch of cluster state update tasks; submitted updates are guaranteed to be processed
* together, potentially with more tasks of the same executor.
*
* @param source the source of the cluster state update task
* @param tasks a map of update tasks and their corresponding listeners
* @param config the cluster state update task configuration
* @param executor the cluster state update task executor; tasks that share the same executor will
* be executed batches on this executor
* @param <T> the type of the cluster state update task state
*/
public <T> void submitStateUpdateTasks(
final String source,
final Map<T, ClusterStateTaskListener> tasks,
final ClusterStateTaskConfig config,
final ClusterStateTaskExecutor<T> executor) {
if (!lifecycle.started()) {
return;
}
if (tasks.isEmpty()) {
return;
}
try {
// convert to an identity map to check for dups based on update tasks semantics of using
// identity instead of equal
final IdentityHashMap<T, ClusterStateTaskListener> tasksIdentity =
new IdentityHashMap<>(tasks);
final List<UpdateTask<T>> updateTasks =
tasksIdentity
.entrySet()
.stream()
.map(
entry ->
new UpdateTask<>(
source, entry.getKey(), config, executor, safe(entry.getValue(), logger)))
.collect(Collectors.toList());
synchronized (updateTasksPerExecutor) {
List<UpdateTask> existingTasks =
updateTasksPerExecutor.computeIfAbsent(executor, k -> new ArrayList<>());
for (@SuppressWarnings("unchecked") UpdateTask<T> existing : existingTasks) {
if (tasksIdentity.containsKey(existing.task)) {
throw new IllegalStateException(
"task ["
+ executor.describeTasks(Collections.singletonList(existing.task))
+ "] with source ["
+ source
+ "] is already queued");
}
}
existingTasks.addAll(updateTasks);
}
final UpdateTask<T> firstTask = updateTasks.get(0);
if (config.timeout() != null) {
updateTasksExecutor.execute(
firstTask,
threadPool.scheduler(),
config.timeout(),
() ->
threadPool
.generic()
.execute(
() -> {
for (UpdateTask<T> task : updateTasks) {
if (task.processed.getAndSet(true) == false) {
logger.debug(
"cluster state update task [{}] timed out after [{}]",
source,
config.timeout());
task.listener.onFailure(
source,
new ProcessClusterEventTimeoutException(
config.timeout(), source));
}
}
}));
} else {
updateTasksExecutor.execute(firstTask);
}
} catch (EsRejectedExecutionException e) {
// ignore cases where we are shutting down..., there is really nothing interesting
// to be done here...
if (!lifecycle.stoppedOrClosed()) {
throw e;
}
}
}
/** Returns the tasks that are pending. */
public List<PendingClusterTask> pendingTasks() {
PrioritizedEsThreadPoolExecutor.Pending[] pendings = updateTasksExecutor.getPending();
List<PendingClusterTask> pendingClusterTasks = new ArrayList<>(pendings.length);
for (PrioritizedEsThreadPoolExecutor.Pending pending : pendings) {
final String source;
final long timeInQueue;
// we have to capture the task as it will be nulled after execution and we don't want to
// change while we check things here.
final Object task = pending.task;
if (task == null) {
continue;
} else if (task instanceof SourcePrioritizedRunnable) {
SourcePrioritizedRunnable runnable = (SourcePrioritizedRunnable) task;
source = runnable.source();
timeInQueue = runnable.getAgeInMillis();
} else {
assert false : "expected SourcePrioritizedRunnable got " + task.getClass();
source = "unknown [" + task.getClass() + "]";
timeInQueue = 0;
}
pendingClusterTasks.add(
new PendingClusterTask(
pending.insertionOrder,
pending.priority,
new Text(source),
timeInQueue,
pending.executing));
}
return pendingClusterTasks;
}
/** Returns the number of currently pending tasks. */
public int numberOfPendingTasks() {
return updateTasksExecutor.getNumberOfPendingTasks();
}
/**
* Returns the maximum wait time for tasks in the queue
*
* @return A zero time value if the queue is empty, otherwise the time value oldest task waiting
* in the queue
*/
public TimeValue getMaxTaskWaitTime() {
return updateTasksExecutor.getMaxTaskWaitTime();
}
/** asserts that the current thread is the cluster state update thread */
public static boolean assertClusterStateThread() {
assert Thread.currentThread().getName().contains(ClusterService.UPDATE_THREAD_NAME)
: "not called from the cluster state update thread";
return true;
}
public ClusterName getClusterName() {
return clusterName;
}
abstract static class SourcePrioritizedRunnable extends PrioritizedRunnable {
protected final String source;
public SourcePrioritizedRunnable(Priority priority, String source) {
super(priority);
this.source = source;
}
public String source() {
return source;
}
}
<T> void runTasksForExecutor(ClusterStateTaskExecutor<T> executor) {
final ArrayList<UpdateTask<T>> toExecute = new ArrayList<>();
final Map<String, ArrayList<T>> processTasksBySource = new HashMap<>();
synchronized (updateTasksPerExecutor) {
List<UpdateTask> pending = updateTasksPerExecutor.remove(executor);
if (pending != null) {
for (UpdateTask<T> task : pending) {
if (task.processed.getAndSet(true) == false) {
logger.trace("will process {}", task.toString(executor));
toExecute.add(task);
processTasksBySource
.computeIfAbsent(task.source, s -> new ArrayList<>())
.add(task.task);
} else {
logger.trace("skipping {}, already processed", task.toString(executor));
}
}
}
}
if (toExecute.isEmpty()) {
return;
}
final String tasksSummary =
processTasksBySource
.entrySet()
.stream()
.map(
entry -> {
String tasks = executor.describeTasks(entry.getValue());
return tasks.isEmpty() ? entry.getKey() : entry.getKey() + "[" + tasks + "]";
})
.reduce((s1, s2) -> s1 + ", " + s2)
.orElse("");
if (!lifecycle.started()) {
logger.debug("processing [{}]: ignoring, cluster_service not started", tasksSummary);
return;
}
logger.debug("processing [{}]: execute", tasksSummary);
ClusterState previousClusterState = clusterState;
if (!previousClusterState.nodes().isLocalNodeElectedMaster() && executor.runOnlyOnMaster()) {
logger.debug("failing [{}]: local node is no longer master", tasksSummary);
toExecute.stream().forEach(task -> task.listener.onNoLongerMaster(task.source));
return;
}
ClusterStateTaskExecutor.BatchResult<T> batchResult;
long startTimeNS = currentTimeInNanos();
try {
List<T> inputs =
toExecute.stream().map(tUpdateTask -> tUpdateTask.task).collect(Collectors.toList());
batchResult = executor.execute(previousClusterState, inputs);
} catch (Exception e) {
TimeValue executionTime =
TimeValue.timeValueMillis(
Math.max(0, TimeValue.nsecToMSec(currentTimeInNanos() - startTimeNS)));
if (logger.isTraceEnabled()) {
logger.trace(
(Supplier<?>)
() ->
new ParameterizedMessage(
"failed to execute cluster state update in [{}], state:\nversion [{}], source [{}]\n{}{}{}",
executionTime,
previousClusterState.version(),
tasksSummary,
previousClusterState.nodes().prettyPrint(),
previousClusterState.routingTable().prettyPrint(),
previousClusterState.getRoutingNodes().prettyPrint()),
e);
}
warnAboutSlowTaskIfNeeded(executionTime, tasksSummary);
batchResult =
ClusterStateTaskExecutor.BatchResult.<T>builder()
.failures(toExecute.stream().map(updateTask -> updateTask.task)::iterator, e)
.build(previousClusterState);
}
assert batchResult.executionResults != null;
assert batchResult.executionResults.size() == toExecute.size()
: String.format(
Locale.ROOT,
"expected [%d] task result%s but was [%d]",
toExecute.size(),
toExecute.size() == 1 ? "" : "s",
batchResult.executionResults.size());
boolean assertsEnabled = false;
assert (assertsEnabled = true);
if (assertsEnabled) {
for (UpdateTask<T> updateTask : toExecute) {
assert batchResult.executionResults.containsKey(updateTask.task)
: "missing task result for " + updateTask.toString(executor);
}
}
ClusterState newClusterState = batchResult.resultingState;
final ArrayList<UpdateTask<T>> proccessedListeners = new ArrayList<>();
// fail all tasks that have failed and extract those that are waiting for results
for (UpdateTask<T> updateTask : toExecute) {
assert batchResult.executionResults.containsKey(updateTask.task)
: "missing " + updateTask.toString(executor);
final ClusterStateTaskExecutor.TaskResult executionResult =
batchResult.executionResults.get(updateTask.task);
executionResult.handle(
() -> proccessedListeners.add(updateTask),
ex -> {
logger.debug(
(Supplier<?>)
() ->
new ParameterizedMessage(
"cluster state update task {} failed", updateTask.toString(executor)),
ex);
updateTask.listener.onFailure(updateTask.source, ex);
});
}
if (previousClusterState == newClusterState) {
for (UpdateTask<T> task : proccessedListeners) {
if (task.listener instanceof AckedClusterStateTaskListener) {
// no need to wait for ack if nothing changed, the update can be counted as acknowledged
((AckedClusterStateTaskListener) task.listener).onAllNodesAcked(null);
}
task.listener.clusterStateProcessed(task.source, previousClusterState, newClusterState);
}
TimeValue executionTime =
TimeValue.timeValueMillis(
Math.max(0, TimeValue.nsecToMSec(currentTimeInNanos() - startTimeNS)));
logger.debug(
"processing [{}]: took [{}] no change in cluster_state", tasksSummary, executionTime);
warnAboutSlowTaskIfNeeded(executionTime, tasksSummary);
return;
}
try {
ArrayList<Discovery.AckListener> ackListeners = new ArrayList<>();
if (newClusterState.nodes().isLocalNodeElectedMaster()) {
// only the master controls the version numbers
Builder builder = ClusterState.builder(newClusterState).incrementVersion();
if (previousClusterState.routingTable() != newClusterState.routingTable()) {
builder.routingTable(
RoutingTable.builder(newClusterState.routingTable())
.version(newClusterState.routingTable().version() + 1)
.build());
}
if (previousClusterState.metaData() != newClusterState.metaData()) {
builder.metaData(
MetaData.builder(newClusterState.metaData())
.version(newClusterState.metaData().version() + 1));
}
newClusterState = builder.build();
for (UpdateTask<T> task : proccessedListeners) {
if (task.listener instanceof AckedClusterStateTaskListener) {
final AckedClusterStateTaskListener ackedListener =
(AckedClusterStateTaskListener) task.listener;
if (ackedListener.ackTimeout() == null || ackedListener.ackTimeout().millis() == 0) {
ackedListener.onAckTimeout();
} else {
try {
ackListeners.add(
new AckCountDownListener(
ackedListener,
newClusterState.version(),
newClusterState.nodes(),
threadPool));
} catch (EsRejectedExecutionException ex) {
if (logger.isDebugEnabled()) {
logger.debug(
"Couldn't schedule timeout thread - node might be shutting down", ex);
}
// timeout straightaway, otherwise we could wait forever as the timeout thread has
// not started
ackedListener.onAckTimeout();
}
}
}
}
}
final Discovery.AckListener ackListener = new DelegetingAckListener(ackListeners);
newClusterState.status(ClusterState.ClusterStateStatus.BEING_APPLIED);
if (logger.isTraceEnabled()) {
logger.trace(
"cluster state updated, source [{}]\n{}", tasksSummary, newClusterState.prettyPrint());
} else if (logger.isDebugEnabled()) {
logger.debug(
"cluster state updated, version [{}], source [{}]",
newClusterState.version(),
tasksSummary);
}
ClusterChangedEvent clusterChangedEvent =
new ClusterChangedEvent(tasksSummary, newClusterState, previousClusterState);
// new cluster state, notify all listeners
final DiscoveryNodes.Delta nodesDelta = clusterChangedEvent.nodesDelta();
if (nodesDelta.hasChanges() && logger.isInfoEnabled()) {
String summary = nodesDelta.shortSummary();
if (summary.length() > 0) {
logger.info("{}, reason: {}", summary, tasksSummary);
}
}
nodeConnectionsService.connectToAddedNodes(clusterChangedEvent);
// if we are the master, publish the new state to all nodes
// we publish here before we send a notification to all the listeners, since if it fails
// we don't want to notify
if (newClusterState.nodes().isLocalNodeElectedMaster()) {
logger.debug("publishing cluster state version [{}]", newClusterState.version());
try {
clusterStatePublisher.accept(clusterChangedEvent, ackListener);
} catch (Discovery.FailedToCommitClusterStateException t) {
final long version = newClusterState.version();
logger.warn(
(Supplier<?>)
() ->
new ParameterizedMessage(
"failing [{}]: failed to commit cluster state version [{}]",
tasksSummary,
version),
t);
proccessedListeners.forEach(task -> task.listener.onFailure(task.source, t));
return;
}
}
// update the current cluster state
clusterState = newClusterState;
logger.debug("set local cluster state to version {}", newClusterState.version());
try {
// nothing to do until we actually recover from the gateway or any other block indicates we
// need to disable persistency
if (clusterChangedEvent.state().blocks().disableStatePersistence() == false
&& clusterChangedEvent.metaDataChanged()) {
final Settings incomingSettings = clusterChangedEvent.state().metaData().settings();
clusterSettings.applySettings(incomingSettings);
}
} catch (Exception ex) {
logger.warn("failed to apply cluster settings", ex);
}
for (ClusterStateListener listener : preAppliedListeners) {
try {
listener.clusterChanged(clusterChangedEvent);
} catch (Exception ex) {
logger.warn("failed to notify ClusterStateListener", ex);
}
}
nodeConnectionsService.disconnectFromRemovedNodes(clusterChangedEvent);
newClusterState.status(ClusterState.ClusterStateStatus.APPLIED);
for (ClusterStateListener listener : postAppliedListeners) {
try {
listener.clusterChanged(clusterChangedEvent);
} catch (Exception ex) {
logger.warn("failed to notify ClusterStateListener", ex);
}
}
// manual ack only from the master at the end of the publish
if (newClusterState.nodes().isLocalNodeElectedMaster()) {
try {
ackListener.onNodeAck(newClusterState.nodes().getLocalNode(), null);
} catch (Exception e) {
final DiscoveryNode localNode = newClusterState.nodes().getLocalNode();
logger.debug(
(Supplier<?>)
() ->
new ParameterizedMessage(
"error while processing ack for master node [{}]", localNode),
e);
}
}
for (UpdateTask<T> task : proccessedListeners) {
task.listener.clusterStateProcessed(task.source, previousClusterState, newClusterState);
}
try {
executor.clusterStatePublished(clusterChangedEvent);
} catch (Exception e) {
logger.error(
(Supplier<?>)
() ->
new ParameterizedMessage(
"exception thrown while notifying executor of new cluster state publication [{}]",
tasksSummary),
e);
}
TimeValue executionTime =
TimeValue.timeValueMillis(
Math.max(0, TimeValue.nsecToMSec(currentTimeInNanos() - startTimeNS)));
logger.debug(
"processing [{}]: took [{}] done applying updated cluster_state (version: {}, uuid: {})",
tasksSummary,
executionTime,
newClusterState.version(),
newClusterState.stateUUID());
warnAboutSlowTaskIfNeeded(executionTime, tasksSummary);
} catch (Exception e) {
TimeValue executionTime =
TimeValue.timeValueMillis(
Math.max(0, TimeValue.nsecToMSec(currentTimeInNanos() - startTimeNS)));
final long version = newClusterState.version();
final String stateUUID = newClusterState.stateUUID();
final String prettyPrint = newClusterState.prettyPrint();
logger.warn(
(Supplier<?>)
() ->
new ParameterizedMessage(
"failed to apply updated cluster state in [{}]:\nversion [{}], uuid [{}], source [{}]\n{}",
executionTime,
version,
stateUUID,
tasksSummary,
prettyPrint),
e);
// TODO: do we want to call updateTask.onFailure here?
}
}
// this one is overridden in tests so we can control time
protected long currentTimeInNanos() {
return System.nanoTime();
}
private static SafeClusterStateTaskListener safe(
ClusterStateTaskListener listener, Logger logger) {
if (listener instanceof AckedClusterStateTaskListener) {
return new SafeAckedClusterStateTaskListener(
(AckedClusterStateTaskListener) listener, logger);
} else {
return new SafeClusterStateTaskListener(listener, logger);
}
}
private static class SafeClusterStateTaskListener implements ClusterStateTaskListener {
private final ClusterStateTaskListener listener;
private final Logger logger;
public SafeClusterStateTaskListener(ClusterStateTaskListener listener, Logger logger) {
this.listener = listener;
this.logger = logger;
}
@Override
public void onFailure(String source, Exception e) {
try {
listener.onFailure(source, e);
} catch (Exception inner) {
inner.addSuppressed(e);
logger.error(
(Supplier<?>)
() ->
new ParameterizedMessage(
"exception thrown by listener notifying of failure from [{}]", source),
inner);
}
}
@Override
public void onNoLongerMaster(String source) {
try {
listener.onNoLongerMaster(source);
} catch (Exception e) {
logger.error(
(Supplier<?>)
() ->
new ParameterizedMessage(
"exception thrown by listener while notifying no longer master from [{}]",
source),
e);
}
}
@Override
public void clusterStateProcessed(String source, ClusterState oldState, ClusterState newState) {
try {
listener.clusterStateProcessed(source, oldState, newState);
} catch (Exception e) {
logger.error(
(Supplier<?>)
() ->
new ParameterizedMessage(
"exception thrown by listener while notifying of cluster state processed from [{}], old cluster state:\n"
+ "{}\nnew cluster state:\n{}",
source,
oldState.prettyPrint(),
newState.prettyPrint()),
e);
}
}
}
private static class SafeAckedClusterStateTaskListener extends SafeClusterStateTaskListener
implements AckedClusterStateTaskListener {
private final AckedClusterStateTaskListener listener;
private final Logger logger;
public SafeAckedClusterStateTaskListener(
AckedClusterStateTaskListener listener, Logger logger) {
super(listener, logger);
this.listener = listener;
this.logger = logger;
}
@Override
public boolean mustAck(DiscoveryNode discoveryNode) {
return listener.mustAck(discoveryNode);
}
@Override
public void onAllNodesAcked(@Nullable Exception e) {
try {
listener.onAllNodesAcked(e);
} catch (Exception inner) {
inner.addSuppressed(e);
logger.error("exception thrown by listener while notifying on all nodes acked", inner);
}
}
@Override
public void onAckTimeout() {
try {
listener.onAckTimeout();
} catch (Exception e) {
logger.error("exception thrown by listener while notifying on ack timeout", e);
}
}
@Override
public TimeValue ackTimeout() {
return listener.ackTimeout();
}
}
class UpdateTask<T> extends SourcePrioritizedRunnable {
public final T task;
public final ClusterStateTaskConfig config;
public final ClusterStateTaskExecutor<T> executor;
public final ClusterStateTaskListener listener;
public final AtomicBoolean processed = new AtomicBoolean();
UpdateTask(
String source,
T task,
ClusterStateTaskConfig config,
ClusterStateTaskExecutor<T> executor,
ClusterStateTaskListener listener) {
super(config.priority(), source);
this.task = task;
this.config = config;
this.executor = executor;
this.listener = listener;
}
@Override
public void run() {
// if this task is already processed, the executor shouldn't execute other tasks (that arrived
// later),
// to give other executors a chance to execute their tasks.
if (processed.get() == false) {
runTasksForExecutor(executor);
}
}
public String toString(ClusterStateTaskExecutor<T> executor) {
String taskDescription = executor.describeTasks(Collections.singletonList(task));
if (taskDescription.isEmpty()) {
return "[" + source + "]";
} else {
return "[" + source + "[" + taskDescription + "]]";
}
}
}
private void warnAboutSlowTaskIfNeeded(TimeValue executionTime, String source) {
if (executionTime.getMillis() > slowTaskLoggingThreshold.getMillis()) {
logger.warn(
"cluster state update task [{}] took [{}] above the warn threshold of {}",
source,
executionTime,
slowTaskLoggingThreshold);
}
}
class NotifyTimeout implements Runnable {
final TimeoutClusterStateListener listener;
final TimeValue timeout;
volatile ScheduledFuture future;
NotifyTimeout(TimeoutClusterStateListener listener, TimeValue timeout) {
this.listener = listener;
this.timeout = timeout;
}
public void cancel() {
FutureUtils.cancel(future);
}
@Override
public void run() {
if (future != null && future.isCancelled()) {
return;
}
if (lifecycle.stoppedOrClosed()) {
listener.onClose();
} else {
listener.onTimeout(this.timeout);
}
// note, we rely on the listener to remove itself in case of timeout if needed
}
}
private static class LocalNodeMasterListeners implements ClusterStateListener {
private final List<LocalNodeMasterListener> listeners = new CopyOnWriteArrayList<>();
private final ThreadPool threadPool;
private volatile boolean master = false;
private LocalNodeMasterListeners(ThreadPool threadPool) {
this.threadPool = threadPool;
}
@Override
public void clusterChanged(ClusterChangedEvent event) {
if (!master && event.localNodeMaster()) {
master = true;
for (LocalNodeMasterListener listener : listeners) {
Executor executor = threadPool.executor(listener.executorName());
executor.execute(new OnMasterRunnable(listener));
}
return;
}
if (master && !event.localNodeMaster()) {
master = false;
for (LocalNodeMasterListener listener : listeners) {
Executor executor = threadPool.executor(listener.executorName());
executor.execute(new OffMasterRunnable(listener));
}
}
}
private void add(LocalNodeMasterListener listener) {
listeners.add(listener);
}
private void remove(LocalNodeMasterListener listener) {
listeners.remove(listener);
}
private void clear() {
listeners.clear();
}
}
private static class OnMasterRunnable implements Runnable {
private final LocalNodeMasterListener listener;
private OnMasterRunnable(LocalNodeMasterListener listener) {
this.listener = listener;
}
@Override
public void run() {
listener.onMaster();
}
}
private static class OffMasterRunnable implements Runnable {
private final LocalNodeMasterListener listener;
private OffMasterRunnable(LocalNodeMasterListener listener) {
this.listener = listener;
}
@Override
public void run() {
listener.offMaster();
}
}
private static class DelegetingAckListener implements Discovery.AckListener {
private final List<Discovery.AckListener> listeners;
private DelegetingAckListener(List<Discovery.AckListener> listeners) {
this.listeners = listeners;
}
@Override
public void onNodeAck(DiscoveryNode node, @Nullable Exception e) {
for (Discovery.AckListener listener : listeners) {
listener.onNodeAck(node, e);
}
}
@Override
public void onTimeout() {
throw new UnsupportedOperationException("no timeout delegation");
}
}
private static class AckCountDownListener implements Discovery.AckListener {
private static final Logger logger = Loggers.getLogger(AckCountDownListener.class);
private final AckedClusterStateTaskListener ackedTaskListener;
private final CountDown countDown;
private final DiscoveryNodes nodes;
private final long clusterStateVersion;
private final Future<?> ackTimeoutCallback;
private Exception lastFailure;
AckCountDownListener(
AckedClusterStateTaskListener ackedTaskListener,
long clusterStateVersion,
DiscoveryNodes nodes,
ThreadPool threadPool) {
this.ackedTaskListener = ackedTaskListener;
this.clusterStateVersion = clusterStateVersion;
this.nodes = nodes;
int countDown = 0;
for (DiscoveryNode node : nodes) {
if (ackedTaskListener.mustAck(node)) {
countDown++;
}
}
// we always wait for at least 1 node (the master)
countDown = Math.max(1, countDown);
logger.trace(
"expecting {} acknowledgements for cluster_state update (version: {})",
countDown,
clusterStateVersion);
this.countDown = new CountDown(countDown);
this.ackTimeoutCallback =
threadPool.schedule(
ackedTaskListener.ackTimeout(),
ThreadPool.Names.GENERIC,
new Runnable() {
@Override
public void run() {
onTimeout();
}
});
}
@Override
public void onNodeAck(DiscoveryNode node, @Nullable Exception e) {
if (!ackedTaskListener.mustAck(node)) {
// we always wait for the master ack anyway
if (!node.equals(nodes.getMasterNode())) {
return;
}
}
if (e == null) {
logger.trace(
"ack received from node [{}], cluster_state update (version: {})",
node,
clusterStateVersion);
} else {
this.lastFailure = e;
logger.debug(
(Supplier<?>)
() ->
new ParameterizedMessage(
"ack received from node [{}], cluster_state update (version: {})",
node,
clusterStateVersion),
e);
}
if (countDown.countDown()) {
logger.trace(
"all expected nodes acknowledged cluster_state update (version: {})",
clusterStateVersion);
FutureUtils.cancel(ackTimeoutCallback);
ackedTaskListener.onAllNodesAcked(lastFailure);
}
}
@Override
public void onTimeout() {
if (countDown.fastForward()) {
logger.trace(
"timeout waiting for acknowledgement for cluster_state update (version: {})",
clusterStateVersion);
ackedTaskListener.onAckTimeout();
}
}
}
public ClusterSettings getClusterSettings() {
return clusterSettings;
}
public Settings getSettings() {
return settings;
}
}
// we do our best to return the shard failures, but its ok if its not fully concurrently safe
// we simply try and return as much as possible
protected final void addShardFailure(ShardSearchFailure failure) {
if (shardFailures == null) {
shardFailures = ConcurrentCollections.newQueue();
}
shardFailures.add(failure);
}