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Apache Dubbo Component

Java SDK (apache/dubbo)

Dubbo Version

Dubbo 3.2.5
Jdk 1.8
Linux

Steps to reproduce this issue

1. Manually perform some service registrations, such as registering one service every 10 seconds, for a total of 20 registrations.
2. Wait for about 5 minutes, and the CPU usage will reach 100%.

What you expected to happen

Without any abnormal conditions, the CPU usage will not reach 100%.

Anything else

The reason is likely that the following code has entered an infinite loop.

// org.apache.dubbo.registry.client.AbstractServiceDiscovery
while (metadataInfos.size() > metadataInfoCacheSize) {
    AtomicReference<String> oldestRevision = new AtomicReference<>();
    AtomicReference<MetadataInfoStat> oldestStat = new AtomicReference<>();
    metadataInfos.forEach((k, v) -> {
        if (System.currentTimeMillis() - v.getUpdateTime() > metadataInfoCacheExpireTime &&
            (oldestStat.get() == null || oldestStat.get().getUpdateTime() > v.getUpdateTime())) {
            oldestRevision.set(k);
            oldestStat.set(v);
        }
    });
    if (oldestStat.get() != null) {
        metadataInfos.remove(oldestRevision.get(), oldestStat.get());
    }
}

Are you willing to submit a pull request to fix on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

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