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Add extra diagnostics to pinpoint issue with missing spoolingOutputStats #22170

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Merged
losipiuk merged 4 commits into from
May 28, 2024
Merged

Add extra diagnostics to pinpoint issue with missing spoolingOutputStats #22170

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e16f4a9
Add sanity checks
losipiuk May 28, 2024
78b6888
Relax log condition
losipiuk May 28, 2024
412900f
Log full task info when unexpected missing spoolingOutputStats
losipiuk May 28, 2024
7de50e4
Add extra diagnostics to pinpoint issue with missing spoolingOutputStats
losipiuk May 28, 2024
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Add extra diagnostics to pinpoint issue with missing spoolingOutputStats
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@losipiuk
losipiuk committed May 28, 2024
commit 7de50e447965c07ca78afb4090e07f8fa9c692e5
7 changes: 6 additions & 1 deletion core/trino-main/src/main/java/io/trino/server/remotetask/TaskInfoFetcher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -272,9 +272,11 @@ synchronized void updateTaskInfo(TaskInfo newTaskInfo)
newTaskInfo = newTaskInfo.withEstimatedMemory(estimatedMemory.get());
}

boolean missingSpoolingOutputStats = false;
if (newTaskInfo.taskStatus().getState().isDone()) {
boolean wasSet = spoolingOutputStats.compareAndSet(null, newTaskInfo.outputBuffers().getSpoolingOutputStats().orElse(null));
if (newTaskInfo.taskStatus().getState() == TaskState.FINISHED && retryPolicy == TASK && wasSet && spoolingOutputStats.get() == null) {
missingSpoolingOutputStats = true;
if (log.isDebugEnabled()) {
log.debug("Task %s was updated to null spoolingOutputStats. Future calls to retrieveAndDropSpoolingOutputStats will fail; taskInfo=%s", taskId, taskInfoCodec.toJson(newTaskInfo));
}
Expand All @@ -296,7 +298,10 @@ synchronized void updateTaskInfo(TaskInfo newTaskInfo)

if (updated && newValue.taskStatus().getState().isDone()) {
taskStatusFetcher.updateTaskStatus(newTaskInfo.taskStatus());
finalTaskInfo.compareAndSet(Optional.empty(), Optional.of(newValue));
boolean finalTaskInfoUpdated = finalTaskInfo.compareAndSet(Optional.empty(), Optional.of(newValue));
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@dekimir dekimir Jun 1, 2024

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It seems to me that we should just refuse to update finalTaskInfo here if missingSpoolingOutputStats is true. Updating it will trigger the listener registered here:

trino/core/trino-main/src/main/java/io/trino/execution/scheduler/faulttolerant/EventDrivenFaultTolerantQueryScheduler.java

Line 1690 in 27e7863

task.addFinalTaskInfoListener(taskInfo -> eventQueue.add(new RemoteTaskCompletedEvent(taskInfo.taskStatus())));

which will eventually trigger this line:

trino/core/trino-main/src/main/java/io/trino/execution/scheduler/faulttolerant/EventDrivenFaultTolerantQueryScheduler.java

Line 2810 in 27e7863

SpoolingOutputStats.Snapshot outputStats = remoteTask.retrieveAndDropSpoolingOutputStats();

and that's forbidden when the spoolingOutputStats is missing.

Storing a null stats here guarantees that the null check will fail in retrieveAndDropSpoolingOutputStats().

if (missingSpoolingOutputStats && finalTaskInfoUpdated) {
log.debug("Updated finalTaskInfo for task %s to one with missing spoolingOutputStats", taskId);
}
stop();
}
}
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