magibney commented on code in PR #833:
URL: https://github.com/apache/solr/pull/833#discussion_r864065556
##########
solr/core/src/java/org/apache/solr/cloud/ZkController.java:
##########
@@ -705,6 +709,8 @@ public void preClose() {
} finally {
ExecutorUtil.shutdownAndAwaitTermination(customThreadPool);
}
+
+ ExecutorUtil.shutdownAndAwaitTermination(fireEventListenersThreadPool);
Review Comment:
Do we perhaps want `shutdownNowAndAwaitTermination()` here? At least some
related test failures involve submitted tasks in free-floating Thread blocking
searcher init; I think `shutdownAndAwaitTermination()` would track those
threads, so not _leak_ them, but might nonetheless deadlock in the same way?
Would it be too cute to shutdown the `fireEventListenersThreadPool` via a
task submitted to `customThreadPool`, immediately above? I don't think order
should matter with this, so "the sooner the better" might be the way to go
(unless there's a reason to delay `fireEventListenersThreadPool` shutdown until
after the other close tasks are complete). FWIW I think this use would be in
keeping with the spirit of the `customThreadPool`.
##########
solr/core/src/java/org/apache/solr/cloud/ZkController.java:
##########
@@ -2754,19 +2760,18 @@ private boolean fireEventListeners(String zkDir) {
if (listeners != null && !listeners.isEmpty()) {
final Set<Runnable> listenersCopy = new HashSet<>(listeners);
// run these in a separate thread because this can be long running
- new Thread(
- () -> {
- log.debug("Running listeners for {}", zkDir);
- for (final Runnable listener : listenersCopy) {
- try {
- listener.run();
- } catch (Exception e) {
- log.warn("listener throws error", e);
- }
- }
- },
- "ZKEventListenerThread")
- .start();
+ fireEventListenersThreadPool.submit(
+ () -> {
+ log.debug("Running listeners for {}", zkDir);
+ for (final Runnable listener : listenersCopy) {
+ try {
+ listener.run();
+ } catch (Exception e) {
+ log.warn("listener throws error", e);
+ }
+ }
+ return null;
Review Comment:
Could we just remove `return null` and let this be a Runnable as opposed to
a Callable? There's no return, and no checked exceptions.
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