MrChang0 commented on PR #1639:
URL: https://github.com/apache/incubator-fury/pull/1639#issuecomment-2119204369
I explain it.
```java
@Test
public void testCache() throws InterruptedException {
Cache<String, String> cache =
CacheBuilder.newBuilder().expireAfterAccess(Duration.ofSeconds(1)).build();
cache.put("1", "1");
cache.put("2", "2");
Assert.assertEquals(cache.size(), 2);
Thread.sleep(800);
cache.getIfPresent("1");
// clean up do nothing, because key1, key2 both alive.
cache.cleanUp();
Assert.assertEquals(cache.size(), 2);
Thread.sleep(800);
cache.getIfPresent("1");
Assert.assertEquals(cache.size(), 2);
Thread.sleep(800);
cache.getIfPresent("1");
// key2 is expired, but if not cleanup, key2 will not clean. may be
case memory leak
Assert.assertEquals(cache.size(), 2);
cache.cleanUp();
// clean up clear key2, because key2 is expired.
Assert.assertEquals(cache.size(), 1);
}
```
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