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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2022/08/26 15:38:56 UTC
[GitHub] [hadoop] zhangshuyan0 opened a new pull request, #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
zhangshuyan0 opened a new pull request, #4811:
URL: https://github.com/apache/hadoop/pull/4811
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[GitHub] [hadoop] zhangshuyan0 commented on pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
Posted by GitBox <gi...@apache.org>.
zhangshuyan0 commented on PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#issuecomment-1229102067
@Hexiaoqiao @xkrogen Would you mind reviewing this? I noticed that [https://issues.apache.org/jira/browse/HADOOP-13804](url) is a related JIRA.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#issuecomment-1228842817
:confetti_ball: **+1 overall**
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[GitHub] [hadoop] Hexiaoqiao commented on pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
Posted by GitBox <gi...@apache.org>.
Hexiaoqiao commented on PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#issuecomment-1235178614
> I think we can better handle this problem by fully changing to use the weighted incremental version of Welford's. I've submitted a PR demonstrating this: https://github.com/apache/hadoop/pull/4844. PTAL.
Great, will review it for a while.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#issuecomment-1233968057
:broken_heart: **-1 overall**
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[GitHub] [hadoop] Hexiaoqiao commented on a diff in pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
Posted by GitBox <gi...@apache.org>.
Hexiaoqiao commented on code in PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#discussion_r956979425
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/util/SampleStat.java:
##########
@@ -91,7 +91,7 @@ public SampleStat add(long nSamples, double x) {
}
else {
// The Welford method for numerical stability
- a1 = a0 + (x - a0) / numSamples;
+ a1 = a0 + (x - a0 * nSamples) / numSamples;
Review Comment:
Great catch here. It makes sense to me.
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/util/SampleStat.java:
##########
@@ -117,7 +117,7 @@ public double total() {
* @return the arithmetic mean of the samples
*/
public double mean() {
- return numSamples > 0 ? (total / numSamples) : 0.0;
+ return numSamples > 0 ? a1 : 0.0;
Review Comment:
I am not sure why update here at HADOOP-13804.
@xkrogen would you mind to give another check?
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[GitHub] [hadoop] zhangshuyan0 commented on pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
Posted by GitBox <gi...@apache.org>.
zhangshuyan0 commented on PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#issuecomment-1233756587
> @zhangshuyan0 It is great catch for me. Just suggest to add some description from this PR and annotation for the new unit test. Thanks.
Thanks for your advice. I have added some comments to JIRA and the code to make it clearer.
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[GitHub] [hadoop] Hexiaoqiao commented on pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
Posted by GitBox <gi...@apache.org>.
Hexiaoqiao commented on PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#issuecomment-1234288808
Re-trigger yetus because last build failed based on report result.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#issuecomment-1234605093
:confetti_ball: **+1 overall**
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Re: [PR] HADOOP-18426. Improve the accuracy of MutableStat mean. [hadoop]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #4811:
URL: https://github.com/apache/hadoop/pull/4811#issuecomment-3483177090
We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
Thanks all for your contribution.
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Re: [PR] HADOOP-18426. Improve the accuracy of MutableStat mean. [hadoop]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed pull request #4811: HADOOP-18426. Improve the accuracy of MutableStat mean.
URL: https://github.com/apache/hadoop/pull/4811
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