adriancole 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_r289585043
##########
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:
just to make sure my jetlag math was ok, I added this assert temporarily and
it passed :)
`assert now == updateAt + -nanosUntilReset;`
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