zentol commented on a change in pull request #11536: [FLINK-16807][e2e] Improve
reporting for instantiation errors
URL: https://github.com/apache/flink/pull/11536#discussion_r399539228
##########
File path:
flink-end-to-end-tests/flink-end-to-end-tests-common/src/main/java/org/apache/flink/tests/util/util/FactoryUtils.java
##########
@@ -43,24 +45,43 @@
* @throws RuntimeException if no or multiple resources could be
instantiated
* @return created instance
*/
- public static <R, F> R loadAndInvokeFactory(final Class<F>
factoryInterface, final Function<F, Optional<R>> factoryInvoker, final
Supplier<F> defaultProvider) {
+ public static <R, F> R loadAndInvokeFactory(final Class<F>
factoryInterface, final FactoryInvoker<F, R> factoryInvoker, final Supplier<F>
defaultProvider) {
final ServiceLoader<F> factories =
ServiceLoader.load(factoryInterface);
- final List<R> resources =
StreamSupport.stream(factories.spliterator(), false)
- .map(factoryInvoker)
- .filter(Optional::isPresent)
- .map(Optional::get)
- .collect(Collectors.toList());
+ final List<R> instantiatedResources = new ArrayList<>();
+ final List<Exception> errorsDuringInitialization = new
ArrayList<>();
+ for (F factory : factories) {
+ try {
+ R resource = factoryInvoker.invoke(factory);
+ instantiatedResources.add(resource);
+ LOG.info("Instantiated {}.",
resource.getClass().getSimpleName());
+ } catch (Exception e) {
+ LOG.debug("Factory {} could not instantiate
instance.", factory.getClass().getSimpleName(), e);
+ errorsDuringInitialization.add(e);
+ }
+ }
- if (resources.size() == 1) {
- return resources.get(0);
+ if (instantiatedResources.size() == 1) {
+ return instantiatedResources.get(0);
}
- if (resources.isEmpty()) {
- return factoryInvoker.apply(defaultProvider.get())
- .orElseThrow(() -> new RuntimeException("Could
not instantiate instance using default factory."));
+ if (instantiatedResources.isEmpty()) {
+ try {
+ return
factoryInvoker.invoke(defaultProvider.get());
+ } catch (Exception e) {
+ final RuntimeException exception = new
RuntimeException("Could not instantiate instance.");
Review comment:
So, generally speaking it shouldn't be necessary to include `e` as a cause,
the reason being that the default provider is usually included in the set of
factories returned by `ServiceLoader.load`. This also implies that the error is
already being logged.
There is only one exception to this which is the `LolCache`, which generally
speaking should never fail (technically it could if it can't create a
TemporaryDirectory, but then you likely have bigger problems).
Handling at the call-site doesn't really give us a lot; we can't handle the
error but only slightly enhance the error message which shouldn't be necessary
in the first place. For some reason the stack trace is being trimmed to
ridiculous degrees; which may also cause the suppressed exception to not be
shown.
I will investigate why this happens; I did try it with the `FlinkResoure`
without `distDir` being set (the original original cause for this PR), and it
displayed the right exception. But IIRC I did that in the IDE, so maybe
maven/surefire is getting in the way here.
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