kezhuw commented on code in PR #2264:
URL: https://github.com/apache/zookeeper/pull/2264#discussion_r2120001122
##########
zookeeper-server/src/main/java/org/apache/zookeeper/server/BlueThrottle.java:
##########
@@ -327,6 +327,9 @@ public synchronized boolean checkLimit(int need) {
if (diff > fillTime) {
int refill = (int) (diff * fillCount / fillTime);
tokens = Math.min(tokens + refill, maxTokens);
+ if (tokens < 0) {
+ tokens = maxTokens;
+ }
Review Comment:
```suggestion
long refill = diff * fillCount / fillTime;
tokens = (int) Math.min(tokens + refill, maxTokens);
if (tokens < 0) {
tokens = maxTokens;
LOG.error("Throttle config values {}({}) and {}({}) are
insane and cause long integer overflow after {}ms",
CONNECTION_THROTTLE_FILL_TIME, fillTime,
CONNECTION_THROTTLE_FILL_COUNT, fillCount, diff);
}
```
> fillCount is 3 and fillTime is 1，this case is triggered when there is no
request for more than 8 days.
In case of `long` and above settings, it will take 90 million years to
overflow. Even for `fillCount 30000, filleTime 1`(which is insane) it takes 9
thousand years.
So I think we could combine [the two
methods](https://github.com/apache/zookeeper/pull/2264#discussion_r2113804414)
together to solve both overflow and insane/incorrect configurations.
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