hudi-agent commented on code in PR #19485:
URL: https://github.com/apache/hudi/pull/19485#discussion_r3756716482
##########
hudi-utilities/src/test/java/org/apache/hudi/utilities/deltastreamer/HoodieDeltaStreamerTestBase.java:
##########
@@ -763,22 +766,54 @@ static HoodieInstant
assertCommitMetadataForIncrSource(String expected, String t
return lastInstant;
}
+ /**
+ * Polls {@code condition} until it holds, the deltastreamer future
finishes, or the timeout expires.
+ *
+ * <p>On timeout the last error the condition threw is attached to the
failure. Without it the only
+ * output is a bare {@link TimeoutException} pointing at this method,
which says nothing about which
+ * assertion never held - the reason HUDI-6843 stayed open: every report
of it looks identical.
+ */
static void waitTillCondition(Function<Boolean, Boolean> condition, Future
dsFuture, long timeoutInSecs) throws Exception {
- Future<Boolean> res = Executors.newSingleThreadExecutor().submit(() -> {
- boolean ret = false;
- while (!ret && !dsFuture.isDone()) {
- try {
- Thread.sleep(2000);
- ret = condition.apply(true);
- log.info("Condition completed successfully");
- } catch (Throwable error) {
- log.debug("Got error waiting for condition", error);
- ret = false;
+ AtomicReference<Throwable> lastError = new AtomicReference<>();
+ ExecutorService executor = Executors.newSingleThreadExecutor();
+ try {
+ Future<Boolean> res = executor.submit(() -> {
+ boolean ret = false;
+ while (!ret && !dsFuture.isDone() &&
!Thread.currentThread().isInterrupted()) {
+ try {
+ Thread.sleep(2000);
+ ret = condition.apply(true);
+ if (ret) {
+ log.info("Condition completed successfully");
+ }
+ } catch (InterruptedException interrupted) {
+ // shutdownNow below interrupts this thread once the wait has
given up. Thread.sleep clears
+ // the interrupt flag when it throws, so catching this with
everything else would re-enter
+ // the loop and keep polling forever. Restore the flag and stop;
this is not a condition
+ // failure, so it is deliberately not recorded as one.
+ Thread.currentThread().interrupt();
+ break;
+ } catch (Throwable error) {
+ lastError.set(error);
+ ret = false;
+ }
}
+ return ret;
+ });
+ try {
+ res.get(timeoutInSecs, TimeUnit.SECONDS);
+ } catch (TimeoutException e) {
+ Throwable last = lastError.get();
+ throw new AssertionError(String.format(
Review Comment:
🤖 nit: the nested ternaries inside the `AssertionError` constructor are a
little hard to parse at a glance — might be cleaner to compute `cause` and
`detail` as local variables before the `throw`.
<sub><i>⚠️ AI-generated; verify before applying. React 👍/👎 to flag
quality.</i></sub>
##########
hudi-utilities/src/test/java/org/apache/hudi/utilities/deltastreamer/TestWaitTillCondition.java:
##########
@@ -0,0 +1,111 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.hudi.utilities.deltastreamer;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Future;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Covers {@code HoodieDeltaStreamerTestBase.TestHelpers#waitTillCondition},
the helper every
+ * continuous-mode deltastreamer test waits on.
+ *
+ * <p>HUDI-6843 is a flaky timeout in that wait whose only output was
+ * {@code java.util.concurrent.TimeoutException} at this method, with no
indication of which assertion in
+ * the condition never held - the condition's error was logged at debug and
discarded. That is why every
+ * report of the flake looks the same and none of them is actionable.
+ */
+class TestWaitTillCondition {
+
+ /** A deltastreamer future that never finishes, as a continuous-mode job
would be. */
+ private static final Future<?> RUNNING = new CompletableFuture<>();
+
+ /**
+ * The helper polls every 2s, so the timeout has to leave room for several
evaluations. A value close to
+ * one interval would make this test itself flaky on a loaded machine - if
the worker started late and the
+ * first evaluation landed after the timeout, nothing would have been
recorded to report.
+ */
+ private static final int TIMEOUT_WITH_SLACK_SECS = 15;
+
+ @Test
Review Comment:
🤖 nit: `TIMEOUT_WITH_SLACK_SECS` is a bit informal — could you rename it to
`CONDITION_TIMEOUT_SECS` (the Javadoc already explains the reasoning behind the
value)?
<sub><i>⚠️ AI-generated; verify before applying. React 👍/👎 to flag
quality.</i></sub>
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