iamsanjay commented on code in PR #13037:
URL: https://github.com/apache/lucene/pull/13037#discussion_r1473877541
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lucene/core/src/test/org/apache/lucene/index/TestDirectoryReader.java:
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@@ -1005,55 +1010,59 @@ public void testTryIncRef() throws IOException {
dir.close();
}
- public void testStressTryIncRef() throws IOException, InterruptedException {
+ public void testStressTryIncRef() throws Exception {
Directory dir = newDirectory();
IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(new
MockAnalyzer(random())));
- writer.addDocument(new Document());
- writer.commit();
- DirectoryReader r = DirectoryReader.open(dir);
- int numThreads = atLeast(2);
+ final ScheduledExecutorService closeReaderBeforeJoiningThreads =
+ Executors.newSingleThreadScheduledExecutor(new
NamedThreadFactory("testStressTryIncRef"));
- IncThread[] threads = new IncThread[numThreads];
- for (int i = 0; i < threads.length; i++) {
- threads[i] = new IncThread(r, random());
- threads[i].start();
- }
- Thread.sleep(100);
-
- assertTrue(r.tryIncRef());
- r.decRef();
- r.close();
-
- for (IncThread thread : threads) {
- thread.join();
- assertNull(thread.failed);
- }
- assertFalse(r.tryIncRef());
- writer.close();
- dir.close();
- }
-
- static class IncThread extends Thread {
- final IndexReader toInc;
- final Random random;
- Throwable failed;
-
- IncThread(IndexReader toInc, Random random) {
- this.toInc = toInc;
- this.random = random;
- }
Review Comment:
I refactored `testStressTryIncRef` test bit further, removed the IncThread
class and convert it into a runnable. And with that remove the call to
`random()` which we do not use anymore.
Also introduce the try-with-resources statement. I would love to get some
feedback on it!
I observed that usually we are using `Thread.sleep`, in many cases, where we
want to delay the execution of some lines of code in the main thread. For
instance, closing IndexReader in above case before stress test the
`tryIncRef()` and `decRef()` via running two threads simultaneously. To replace
`Thread.sleep`, I inspect the code for which we want the delayed execution and
then schedule that block via `ScheduledExecutorService`. Having said that, I
have my suspicion that whether we want to pivot in that direction.
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