BewareMyPower commented on code in PR #23052:
URL: https://github.com/apache/pulsar/pull/23052#discussion_r1683744928
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pulsar-common/src/main/java/org/apache/pulsar/common/naming/TopicName.java:
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@@ -54,13 +49,13 @@ public class TopicName implements ServiceUnitId {
private final int partitionIndex;
- private static final LoadingCache<String, TopicName> cache =
CacheBuilder.newBuilder().maximumSize(100000)
- .expireAfterAccess(30, TimeUnit.MINUTES).build(new
CacheLoader<String, TopicName>() {
- @Override
- public TopicName load(String name) throws Exception {
- return new TopicName(name);
- }
- });
+ private static final ConcurrentHashMap<String, TopicName> cache = new
ConcurrentHashMap<>();
+
+ public static void clearIfReachedMaxCapacity(int maxCapacity) {
+ if (cache.size() > maxCapacity) {
+ cache.clear();
Review Comment:
The performance of `LoadingCache` is bad because it maintains some other
info. You can see the flame graph in this PR.
When the cache size does not reach 100000, the performance of
`ConcurrentHashMap#get` is 10x than `LoadingCache#get`.
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