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https://issues.apache.org/jira/browse/HBASE-13888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14587400#comment-14587400
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Hudson commented on HBASE-13888:
--------------------------------
SUCCESS: Integrated in HBase-1.1 #543 (See
[https://builds.apache.org/job/HBase-1.1/543/])
HBASE-13888 Fix refill bug from HBASE-13686 (Guanghao Zhang) (tedyu: rev
49700460dabf90562b6f9b4f1f5c45df98668c6c)
* hbase-server/src/test/java/org/apache/hadoop/hbase/quotas/TestRateLimiter.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/AverageIntervalRateLimiter.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/FixedIntervalRateLimiter.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/RateLimiter.java
> Fix refill bug from HBASE-13686
> -------------------------------
>
> Key: HBASE-13888
> URL: https://issues.apache.org/jira/browse/HBASE-13888
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.0, 1.2.0, 1.1.1
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Fix For: 2.0.0, 1.2.0, 1.1.2
>
> Attachments: HBASE-13888-v1.patch, HBASE-13888-v2.patch,
> HBASE-13888-v3.patch
>
>
> As I report the RateLimiter fail to limit in HBASE-13686, then [~ashish
> singhi] fix that problem by support two kinds of RateLimiter:
> AverageIntervalRateLimiter and FixedIntervalRateLimiter. But in my use of the
> code, I found a new bug about refill() in AverageIntervalRateLimiter.
> {code}
> long delta = (limit * (now - nextRefillTime)) /
> super.getTimeUnitInMillis();
> if (delta > 0) {
> this.nextRefillTime = now;
> return Math.min(limit, available + delta);
> }
> {code}
> When delta > 0, refill maybe return available + delta. Then in the
> canExecute(), avail will add refillAmount again. So the new avail maybe 2 *
> avail + delta.
> {code}
> long refillAmount = refill(limit, avail);
> if (refillAmount == 0 && avail < amount) {
> return false;
> }
> // check for positive overflow
> if (avail <= Long.MAX_VALUE - refillAmount) {
> avail = Math.max(0, Math.min(avail + refillAmount, limit));
> } else {
> avail = Math.max(0, limit);
> }
> {code}
> I will add more unit tests for RateLimiter in the next days.
> Review Board: https://reviews.apache.org/r/35384/
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