lirui-apache commented on issue #10620: [FLINK-15239][table-planner-blink] TM
Metaspace memory leak
URL: https://github.com/apache/flink/pull/10620#issuecomment-566928696
I changed the key and value type of this cache because guava will use
identity comparison to determine equality of keys, according to the JavaDoc:
```
/**
* Specifies that each key (not value) stored in the cache should be
wrapped in a {@link
* WeakReference} (by default, strong references are used).
*
* Warning: when this method is used, the resulting cache will
use identity ({@code ==})
* comparison to determine equality of keys.
*
* Entries with keys that have been garbage collected may be counted in
{@link Cache#size},
* but will never be visible to read or write operations; such entries are
cleaned up as part of
* the routine maintenance described in the class javadoc.
*
* @throws IllegalStateException if the key strength was already set
*/
@GwtIncompatible("java.lang.ref.WeakReference")
public CacheBuilder weakKeys() {
return setKeyStrength(Strength.WEAK);
}
```
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