devinsba commented on a change in pull request #908: Fixes some edge cases
around sampler resetting
URL:
https://github.com/apache/incubator-zipkin-brave/pull/908#discussion_r283461739
##########
File path: brave/src/main/java/brave/sampler/RateLimitingSampler.java
##########
@@ -55,14 +55,17 @@ public static Sampler create(int tracesPerSecond) {
long updateAt = nextReset.get();
long nanosUntilReset = -(now - updateAt); // because nanoTime can be
negative
- boolean shouldReset = nanosUntilReset <= 0;
- if (shouldReset) {
- if (nextReset.compareAndSet(updateAt, updateAt + NANOS_PER_SECOND)) {
- usage.set(0);
- }
+ if (nanosUntilReset <= 0) {
+ // Attempt to move into the next sampling interval.
+ // nanosUntilReset is now invalid regardless of race winner, so we can't
sample based on it.
+ if (nextReset.compareAndSet(updateAt, updateAt + NANOS_PER_SECOND))
usage.set(0);
Review comment:
The recursion below should also solve that, but having not seen that problem
(`updateAt` being more than a second in the past) in my first reading, the
recursion is now screaming stack overflow to me so I think that needs to be
addressed
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
