jihoonson commented on a change in pull request #9610: Fix NPE in
RemoteTaskRunner event handler causes JVM shutdown
URL: https://github.com/apache/druid/pull/9610#discussion_r404391313
##########
File path:
indexing-service/src/main/java/org/apache/druid/indexing/overlord/RemoteTaskRunner.java
##########
@@ -969,116 +970,129 @@ private boolean cancelWorkerCleanup(String workerHost)
);
// Add status listener to the watcher for status changes
- zkWorker.addListener(
- (client, event) -> {
- final String taskId;
- final RemoteTaskRunnerWorkItem taskRunnerWorkItem;
- synchronized (statusLock) {
- try {
- switch (event.getType()) {
- case CHILD_ADDED:
- case CHILD_UPDATED:
- taskId =
ZKPaths.getNodeFromPath(event.getData().getPath());
- final TaskAnnouncement announcement = jsonMapper.readValue(
- event.getData().getData(), TaskAnnouncement.class
- );
-
- log.info(
- "Worker[%s] wrote %s status for task [%s] on [%s]",
- zkWorker.getWorker().getHost(),
- announcement.getTaskStatus().getStatusCode(),
- taskId,
- announcement.getTaskLocation()
- );
-
- // Synchronizing state with ZK
- statusLock.notifyAll();
-
- final RemoteTaskRunnerWorkItem tmp;
- if ((tmp = runningTasks.get(taskId)) != null) {
- taskRunnerWorkItem = tmp;
- } else {
- final RemoteTaskRunnerWorkItem newTaskRunnerWorkItem =
new RemoteTaskRunnerWorkItem(
- taskId,
- announcement.getTaskType(),
- zkWorker.getWorker(),
- TaskLocation.unknown(),
- announcement.getTaskDataSource()
- );
- final RemoteTaskRunnerWorkItem existingItem =
runningTasks.putIfAbsent(
- taskId,
- newTaskRunnerWorkItem
- );
- if (existingItem == null) {
- log.warn(
- "Worker[%s] announced a status for a task I didn't
know about, adding to runningTasks: %s",
- zkWorker.getWorker().getHost(),
- taskId
- );
- taskRunnerWorkItem = newTaskRunnerWorkItem;
- } else {
- taskRunnerWorkItem = existingItem;
- }
- }
-
- if
(!announcement.getTaskLocation().equals(taskRunnerWorkItem.getLocation())) {
-
taskRunnerWorkItem.setLocation(announcement.getTaskLocation());
- TaskRunnerUtils.notifyLocationChanged(listeners, taskId,
announcement.getTaskLocation());
- }
+ zkWorker.addListener(getStatusListener(worker, zkWorker, retVal));
+ zkWorker.start();
+ return retVal;
+ }
+ catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
- if (announcement.getTaskStatus().isComplete()) {
- taskComplete(taskRunnerWorkItem, zkWorker,
announcement.getTaskStatus());
- runPendingTasks();
- }
- break;
- case CHILD_REMOVED:
- taskId =
ZKPaths.getNodeFromPath(event.getData().getPath());
- taskRunnerWorkItem = runningTasks.remove(taskId);
- if (taskRunnerWorkItem != null) {
- log.info("Task[%s] just disappeared!", taskId);
- taskRunnerWorkItem.setResult(TaskStatus.failure(taskId));
- TaskRunnerUtils.notifyStatusChanged(listeners, taskId,
TaskStatus.failure(taskId));
- } else {
- log.info("Task[%s] went bye bye.", taskId);
- }
- break;
- case INITIALIZED:
- if (zkWorkers.putIfAbsent(worker.getHost(), zkWorker) ==
null) {
- retVal.set(zkWorker);
- } else {
- final String message = StringUtils.format(
- "WTF?! Tried to add already-existing worker[%s]",
- worker.getHost()
- );
- log.makeAlert(message)
- .addData("workerHost", worker.getHost())
- .addData("workerIp", worker.getIp())
- .emit();
- retVal.setException(new IllegalStateException(message));
- }
- runPendingTasks();
- break;
- case CONNECTION_SUSPENDED:
- case CONNECTION_RECONNECTED:
- case CONNECTION_LOST:
- // do nothing
+ @VisibleForTesting
+ PathChildrenCacheListener getStatusListener(final Worker worker, final
ZkWorker zkWorker, final SettableFuture<ZkWorker> retVal)
+ {
+ return (client, event) -> {
+ final String taskId;
+ final RemoteTaskRunnerWorkItem taskRunnerWorkItem;
+ synchronized (statusLock) {
+ try {
+ switch (event.getType()) { // lgtm
[java/dereferenced-value-may-be-null]
+ case CHILD_ADDED:
+ case CHILD_UPDATED:
+ taskId = ZKPaths.getNodeFromPath(event.getData().getPath()); //
lgtm [java/dereferenced-value-may-be-null]
+ final TaskAnnouncement announcement = jsonMapper.readValue(
+ event.getData().getData(), TaskAnnouncement.class // lgtm
[java/dereferenced-value-may-be-null]
+ );
+
+ log.info(
+ "Worker[%s] wrote %s status for task [%s] on [%s]",
+ zkWorker.getWorker().getHost(),
+ announcement.getTaskStatus().getStatusCode(),
+ taskId,
+ announcement.getTaskLocation()
+ );
+
+ // Synchronizing state with ZK
+ statusLock.notifyAll();
+
+ final RemoteTaskRunnerWorkItem tmp;
+ if ((tmp = runningTasks.get(taskId)) != null) {
+ taskRunnerWorkItem = tmp;
+ } else {
+ final RemoteTaskRunnerWorkItem newTaskRunnerWorkItem = new
RemoteTaskRunnerWorkItem(
+ taskId,
+ announcement.getTaskType(),
+ zkWorker.getWorker(),
+ TaskLocation.unknown(),
+ announcement.getTaskDataSource()
+ );
+ final RemoteTaskRunnerWorkItem existingItem =
runningTasks.putIfAbsent(
+ taskId,
+ newTaskRunnerWorkItem
+ );
+ if (existingItem == null) {
+ log.warn(
+ "Worker[%s] announced a status for a task I didn't know
about, adding to runningTasks: %s",
+ zkWorker.getWorker().getHost(),
+ taskId
+ );
+ taskRunnerWorkItem = newTaskRunnerWorkItem;
+ } else {
+ taskRunnerWorkItem = existingItem;
}
}
- catch (Exception e) {
- log.makeAlert(e, "Failed to handle new worker status")
- .addData("worker", zkWorker.getWorker().getHost())
- .addData("znode", event.getData().getPath())
+
+ if
(!announcement.getTaskLocation().equals(taskRunnerWorkItem.getLocation())) {
+ taskRunnerWorkItem.setLocation(announcement.getTaskLocation());
+ TaskRunnerUtils.notifyLocationChanged(listeners, taskId,
announcement.getTaskLocation());
+ }
+
+ if (announcement.getTaskStatus().isComplete()) {
+ taskComplete(taskRunnerWorkItem, zkWorker,
announcement.getTaskStatus());
+ runPendingTasks();
+ }
+ break;
+ case CHILD_REMOVED:
+ taskId = ZKPaths.getNodeFromPath(event.getData().getPath()); //
lgtm [java/dereferenced-value-may-be-null]
+ taskRunnerWorkItem = runningTasks.remove(taskId);
+ if (taskRunnerWorkItem != null) {
+ log.info("Task[%s] just disappeared!", taskId);
+ taskRunnerWorkItem.setResult(TaskStatus.failure(taskId));
+ TaskRunnerUtils.notifyStatusChanged(listeners, taskId,
TaskStatus.failure(taskId));
+ } else {
+ log.info("Task[%s] went bye bye.", taskId);
+ }
+ break;
+ case INITIALIZED:
+ if (zkWorkers.putIfAbsent(worker.getHost(), zkWorker) == null) {
+ retVal.set(zkWorker);
+ } else {
+ final String message = StringUtils.format(
+ "This should not happen...tried to add already-existing
worker[%s]",
+ worker.getHost()
+ );
+ log.makeAlert(message)
+ .addData("workerHost", worker.getHost())
+ .addData("workerIp", worker.getIp())
.emit();
+ retVal.setException(new IllegalStateException(message));
}
+ runPendingTasks();
+ break;
+ case CONNECTION_SUSPENDED:
+ case CONNECTION_RECONNECTED:
+ case CONNECTION_LOST:
+ // do nothing
+ }
+ }
+ catch (Exception e) {
+ String znode = null;
+ String eventType = null;
+ if (event != null) {
Review comment:
I don't think `event` can ever be null. Check out callers of
`PathChildrenCache.callListeners()`.
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