ctubbsii commented on a change in pull request #2337:
URL: https://github.com/apache/accumulo/pull/2337#discussion_r741634717
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File path:
core/src/main/java/org/apache/accumulo/core/client/impl/TabletServerBatchWriter.java
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@@ -763,7 +763,7 @@ public void run() {
log.trace("{} - binning {} mutations",
Thread.currentThread().getName(),
mutationsToSend.size());
addMutations(mutationsToSend);
- } catch (Exception e) {
+ } catch (Throwable e) {
updateUnknownErrors("Error processing mutation set", e);
Review comment:
@andrewglowacki wrote:
> The Throwable is passed through to the client via updateUnknownErrors
where it is re-thrown. The client can decide to halt the JVM if they so choose.
From what I see, only the lastUnknownError is preserved. This might just get
logged and never sent back to the calling client code. The Error can easily get
suppressed by a more recent and less serious exception, and the serious Error
go overlooked indefinitely.
@keith-turner wrote:
> it seems reasonable that the library should make a best effort attempt to
get any errors that occur in that thread back to the user code
I probably agree that is a reasonable goal, but I'm not convinced the
proposed change does that. I only had time for a quick code review, and it
looked like this change was more likely to result in the Errors being *less*
noticeable to users than *more* noticeable. However, it's not completely
suppressed, as I had originally thought. There is a chance the Error will make
it back to the user code via a MutationsRejectedException. I don't think it's
quite as "failsafe" as killing the JVM or triggering a user-defined
UncaughtExceptionHandler, but it might be the best option for 1.10.
I'd feel more comfortable about this if I knew that the Error couldn't be
completely clobbered by a less severe Exception and that it definitely would
make it back to the user code. Perhaps something can be done with
[`addSuppressed`](https://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html#addSuppressed(java.lang.Throwable))
?
> It seems like the argument against this is that it may not work therefore
do not even make the attempt.
I don't recognize my position in your portrayal here.
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