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https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16860166#comment-16860166
]
Hoss Man commented on LUCENE-8757:
----------------------------------
git bisect has identified cfd9de894d18888f0f1b9e368994b972a81f449c as the cause
of the reproducible test failures that have ocured in jenkins jobs on
branch_8x...
http://fucit.org/solr-jenkins-reports/job-data/thetaphi/Lucene-Solr-8.x-Linux/672/
https://jenkins.thetaphi.de/view/Lucene-Solr/job/Lucene-Solr-8.x-Linux/672/
{noformat}
[junit4] 2> NOTE: reproduce with: ant test -Dtestcase=TestRegexpRandom2
-Dtests.method=testRegexps -Dtests.seed=E712F4979E38CFD8 -Dtests.multiplier=3
-Dtests.slow=true -Dtests.locale=fr-HT -Dtests.timezone=America/New_York
-Dtests.asserts=true -Dtests.file.encoding=US-ASCII
[junit4] FAILURE 0.07s J1 | TestRegexpRandom2.testRegexps <<<
[junit4] > Throwable #1: junit.framework.AssertionFailedError: Hit 5
docnumbers don't match
[junit4] > Hits length1=25 length2=25
[junit4] > hit=0: doc24=1.0, doc24=1.0
[junit4] > hit=1: doc33=1.0, doc33=1.0
[junit4] > hit=2: doc34=1.0, doc34=1.0
[junit4] > hit=3: doc38=1.0, doc38=1.0
[junit4] > hit=4: doc43=1.0, doc43=1.0
[junit4] > hit=5: doc119=1.0, doc183=1.0
[junit4] > hit=6: doc142=1.0, doc188=1.0
[junit4] > hit=7: doc146=1.0, doc193=1.0
[junit4] > hit=8: doc152=1.0, doc228=1.0
[junit4] > hit=9: doc159=1.0, doc244=1.0
[junit4] > hit=10: doc163=1.0, doc250=1.0
[junit4] > hit=11: doc169=1.0, doc282=1.0
[junit4] > hit=12: doc173=1.0, doc284=1.0
[junit4] > hit=13: doc183=1.0, doc291=1.0
[junit4] > hit=14: doc188=1.0, doc300=1.0
[junit4] > hit=15: doc193=1.0, doc320=1.0
[junit4] > hit=16: doc228=1.0, doc347=1.0
[junit4] > hit=17: doc244=1.0, doc349=1.0
[junit4] > hit=18: doc250=1.0, doc405=1.0
[junit4] > hit=19: doc282=1.0, doc418=1.0
[junit4] > hit=20: doc284=1.0, doc431=1.0
[junit4] > hit=21: doc291=1.0, doc443=1.0
[junit4] > hit=22: doc300=1.0, doc490=1.0
[junit4] > hit=23: doc320=1.0, doc513=1.0
[junit4] > hit=24: doc347=1.0, doc555=1.0
[junit4] > for query:/[)*-|핯Ѿ]*+/
[junit4] > at
__randomizedtesting.SeedInfo.seed([E712F4979E38CFD8:64EB58640929850]:0)
[junit4] > at junit.framework.Assert.fail(Assert.java:57)
[junit4] > at
org.apache.lucene.search.CheckHits.checkEqual(CheckHits.java:205)
[junit4] > at
org.apache.lucene.search.TestRegexpRandom2.assertSame(TestRegexpRandom2.java:178)
[junit4] > at
org.apache.lucene.search.TestRegexpRandom2.testRegexps(TestRegexpRandom2.java:164)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[junit4] > at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[junit4] > at
java.base/java.lang.reflect.Method.invoke(Method.java:567)
[junit4] > at java.base/java.lang.Thread.run(Thread.java:835)
{noformat}
> Better Segment To Thread Mapping Algorithm
> ------------------------------------------
>
> Key: LUCENE-8757
> URL: https://issues.apache.org/jira/browse/LUCENE-8757
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Atri Sharma
> Assignee: Simon Willnauer
> Priority: Major
> Fix For: master (9.0), 8.2
>
> Attachments: LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch,
> LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch,
> LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch
>
>
> The current segments to threads allocation algorithm always allocates one
> thread per segment. This is detrimental to performance in case of skew in
> segment sizes since small segments also get their dedicated thread. This can
> lead to performance degradation due to context switching overheads.
>
> A better algorithm which is cognizant of size skew would have better
> performance for realistic scenarios
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