nastra commented on code in PR #5862:
URL: https://github.com/apache/iceberg/pull/5862#discussion_r980941101
##########
core/src/test/java/org/apache/iceberg/TestManifestCaching.java:
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@@ -178,27 +182,27 @@ public void testWeakFileIOReferenceCleanUp() {
System.gc();
manifestCache.cleanUp();
- awaitQuiescence();
- Assert.assertEquals(maxIO, manifestCache.estimatedSize());
Assert.assertEquals(maxIO, manifestCache.stats().loadCount());
- Assert.assertEquals(
- "No entries should be evicted before
IO_MANIFEST_CACHE_MAX_FILEIO_DEFAULT exceeded.",
- 0,
- manifestCache.stats().evictionCount());
// Insert one more FileIO to trigger cache eviction.
FileIO lastIO = cacheEnabledHadoopFileIO();
ContentCache lastCache = contentCache(manifestCache, lastIO);
- System.gc();
- manifestCache.cleanUp();
- awaitQuiescence();
+
+ int numGC = 0;
+ int maxGC = 100;
+ while (manifestCache.estimatedSize() > 2 && numGC < maxGC) {
+ System.gc();
Review Comment:
in general it's not a good practice to depend on repeated (or even single)
`System.gc()` calls to make something work.
I would probably suggest to use
https://github.com/google/guava/blob/master/guava-testlib/src/com/google/common/testing/GcFinalization.java#L297
once here instead of plain `System.gc()` calls in a loop
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