svalaskevicius commented on code in PR #15312:
URL: https://github.com/apache/iceberg/pull/15312#discussion_r2891045175
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core/src/main/java/org/apache/iceberg/util/ThreadPools.java:
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@@ -149,8 +152,86 @@ public static ExecutorService newWorkerPool(String
namePrefix, int poolSize) {
* that should be automatically cleaned up on JVM shutdown.
*/
public static ExecutorService newExitingWorkerPool(String namePrefix, int
poolSize) {
- return MoreExecutors.getExitingExecutorService(
- (ThreadPoolExecutor) newFixedThreadPool(namePrefix, poolSize));
+ ExecutorService service =
+ Executors.unconfigurableExecutorService(newFixedThreadPool(namePrefix,
poolSize));
+ THREAD_POOL_MANAGER.addThreadPool(service, DEFAULT_SHUTDOWN_TIMEOUT);
+ return service;
+ }
+
+ /**
+ * Force manual shutdown of the thread pools created via the {@link
#newExitingWorkerPool(String,
+ * int)}.
+ *
+ * <p>This method allows: (1) to stop thread pools manually, to avoid leaks
in hot-reload
+ * environments; (2) opt-out of the standard shutdown mechanism to manage
graceful service stops
+ * (and commit the last pending files, if the client application needs to
react to shutdown hooks
+ * on its own).
+ *
+ * <p>Please only call this method at the end of the intended usage of the
library, and NEVER
+ * before, as this method will stop thread pools required for normal library
workflows.
+ */
+ public static void shutdownThreadPools() {
+ THREAD_POOL_MANAGER.shutdownAll();
+ removeShutdownHook();
+ }
+
+ /**
+ * Initialize a shutdown hook to stop the thread pools created via the {@link
+ * #newExitingWorkerPool(String, int)}.
+ */
+ @SuppressWarnings("ShutdownHook")
+ static synchronized void initShutdownHook() {
Review Comment:
this is used in tests - so that they could access it to test.. do you have
alternative recommendation?
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