KarmaGYZ commented on a change in pull request #14897:
URL: https://github.com/apache/flink/pull/14897#discussion_r572511815
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File path:
flink-runtime/src/main/java/org/apache/flink/runtime/util/ResourceCounter.java
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@@ -35,11 +37,12 @@
* associated counts. The counts are always positive (> 0).
*/
public final class ResourceCounter {
Review comment:
I make it mutable mainly for performance concerns. If someone uses it
like a "counter", `add` and `substract` resource profile for a lot of times,
the construct of hundreds of `ResourceCounter` might be expensive. It may also
put a lot of pressure on the GC. For instance, every time a slot is allocated,
we will construct 2 `ResourceCounter`s in
`ResourceTracker#notifyAcquiredResource`.
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