ableegoldman commented on a change in pull request #9273:
URL: https://github.com/apache/kafka/pull/9273#discussion_r501873791
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File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
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@@ -364,6 +370,73 @@ public void setUncaughtExceptionHandler(final
Thread.UncaughtExceptionHandler eh
}
}
+ /**
+ * Set the handler invoked when a {@link
StreamsConfig#NUM_STREAM_THREADS_CONFIG internal thread}
+ * throws an unexpected exception.
+ * These might be exceptions indicating rare bugs in Kafka Streams, or they
+ * might be exceptions thrown by your code, for example a
NullPointerException thrown from your processor
+ * logic.
+ * <p>
+ * Note, this handler must be threadsafe, since it will be shared among
all threads, and invoked from any
+ * thread that encounters such an exception.
+ *
+ * @param streamsUncaughtExceptionHandler the uncaught exception handler
of type {@link StreamsUncaughtExceptionHandler} for all internal threads;
{@code null} deletes the current handler
+ * @throws IllegalStateException if this {@code KafkaStreams} instance is
not in state {@link State#CREATED CREATED}.
+ */
+ public void setUncaughtExceptionHandler(final
StreamsUncaughtExceptionHandler streamsUncaughtExceptionHandler) {
+ final StreamsUncaughtExceptionHandler handler = throwable ->
handleStreamsUncaughtException(throwable, streamsUncaughtExceptionHandler);
+ synchronized (stateLock) {
+ if (state == State.CREATED) {
+ for (final StreamThread thread : threads) {
+ if (streamsUncaughtExceptionHandler != null) {
Review comment:
I agree with Bruno, I don't see why anyone would want to reset the
exception handler (why set it in the first place then?). But if for some reason
they really did set it at some point in their code and then later on want to
revert to the default behavior, they can just pass in a handler that returns
`SHUTDOWN_STREAMTHREAD_THREAD` themselves. If that's really what they want,
then they should specify it.
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