AmatyaAvadhanula commented on code in PR #13223:
URL: https://github.com/apache/druid/pull/13223#discussion_r998912112
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indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/SeekableStreamSupervisor.java:
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@@ -1950,6 +1950,45 @@ public Boolean
apply(SeekableStreamIndexTaskRunner.Status status)
// make sure the checkpoints are consistent with each other and with the
metadata store
verifyAndMergeCheckpoints(taskGroupsToVerify.values());
+
+ // A pause from the previous Overlord's supervisor, immediately before
leader change
+ // can lead to tasks being in a state where they are active but do not
read.
+ // If this is the first run, resume all existing active tasks to be safe
+ if (getState().isFirstRunOnly()) {
+ Map<String, ListenableFuture<Boolean>> activeTaskToResumeFutureMap = new
HashMap<>();
+ for (TaskGroup taskGroup : activelyReadingTaskGroups.values()) {
+ for (String taskId : taskGroup.tasks.keySet()) {
+ activeTaskToResumeFutureMap.put(taskId,
taskClient.resumeAsync(taskId));
+ }
+ }
+
+ for (Map.Entry<String, ListenableFuture<Boolean>> entry :
activeTaskToResumeFutureMap.entrySet()) {
+ String taskId = entry.getKey();
+ ListenableFuture<Boolean> future = entry.getValue();
+ future.addListener(
+ new Runnable()
+ {
+ @Override
+ public void run()
+ {
+ try {
+ if (entry.getValue().get()) {
Review Comment:
Yes. Also, PUBLISHING tasks are not resumed. Only READING / PAUSED tasks
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