benwtrent commented on code in PR #13190:
URL: https://github.com/apache/lucene/pull/13190#discussion_r1531018293
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lucene/core/src/java/org/apache/lucene/index/MergeRateLimiter.java:
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@@ -118,24 +118,32 @@ private long maybePause(long bytes, long curNS) throws
MergePolicy.MergeAbortedE
throw new MergePolicy.MergeAbortedException("Merge aborted.");
}
- double rate = mbPerSec; // read from volatile rate once.
- double secondsToPause = (bytes / 1024. / 1024.) / rate;
-
- // Time we should sleep until; this is purely instantaneous
- // rate (just adds seconds onto the last time we had paused to);
- // maybe we should also offer decayed recent history one?
- long targetNS = lastNS + (long) (1000000000 * secondsToPause);
-
- long curPauseNS = targetNS - curNS;
-
- // We don't bother with thread pausing if the pause is smaller than 2 msec.
- if (curPauseNS <= MIN_PAUSE_NS) {
- // Set to curNS, not targetNS, to enforce the instant rate, not
- // the "averaged over all history" rate:
- lastNS = curNS;
+ final double rate = mbPerSec; // read from volatile rate once.
+ final double secondsToPause = (bytes / 1024. / 1024.) / rate;
+
+ AtomicLong curPauseNSSetter = new AtomicLong();
+ lastNS.updateAndGet(
Review Comment:
So, the limits are on a per `RateLimitedIndexOutput` bases, not necessarily
per thread. Since all `RateLimitedIndexOutput` constructed share the same
rate-limiter, it might pause all threads?
But I don't think so, as each process could have its own
`RateLimitedIndexOutput` which is tracking its own bytes locally and while the
combined total of all threads might exceed the throttling limit, the output
isn't really throttled until a single thread exceeds the limit.
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