zymap commented on code in PR #3417:
URL: https://github.com/apache/bookkeeper/pull/3417#discussion_r929436578
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bookkeeper-server/src/main/java/org/apache/bookkeeper/util/collections/ConcurrentLongHashMap.java:
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@@ -507,7 +507,11 @@ private V remove(long key, Object value, int keyHash) {
} finally {
if (autoShrink && size < resizeThresholdBelow) {
try {
- int newCapacity = alignToPowerOfTwo((int) (capacity /
shrinkFactor));
+ // Shrinking must at least ensure initCapacity,
+ // so as to avoid frequent shrinking and expansion
near initCapacity,
+ // frequent shrinking and expansion,
+ // additionally opened arrays will consume more memory
and affect GC
+ int newCapacity = Math.max(alignToPowerOfTwo((int)
(capacity / shrinkFactor)), initCapacity);
Review Comment:
Why not just skip shrink when the size is smaller than the `initCapacity`?
That would save a lot of computing of `alignToPowerOfTwo((int) (capacity /
shrinkFactor))`
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