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https://issues.apache.org/jira/browse/SOLR-11216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522479#comment-16522479
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Steve Rowe commented on SOLR-11216:
-----------------------------------
Policeman Jenkins found a reproducing seed for a {}} failure that {{git
bisect}} blames on commit {{412116f}} on this issue
[https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/2190/]:
{noformat}
Checking out Revision 82b793df56c8c9fb50c29f46f39465453a87f2b2
(refs/remotes/origin/branch_7x)
[...]
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=TestStressCloudBlindAtomicUpdates -Dtests.method=test_dv_idx
-Dtests.seed=9E9025C836D166FA -Dtests.multiplier=3 -Dtests.slow=true
-Dtests.locale=ga -Dtests.timezone=Europe/Monaco -Dtests.asserts=true
-Dtests.file.encoding=UTF-8
[junit4] FAILURE 11.4s J1 | TestStressCloudBlindAtomicUpdates.test_dv_idx <<<
[junit4] > Throwable #1: java.lang.AssertionError: Some docs had errors
-- check logs expected:<0> but was:<7>
[junit4] > at
__randomizedtesting.SeedInfo.seed([9E9025C836D166FA:BEC5000EA0DCB1B]:0)
[junit4] > at
org.apache.solr.cloud.TestStressCloudBlindAtomicUpdates.checkField(TestStressCloudBlindAtomicUpdates.java:342)
[junit4] > at
org.apache.solr.cloud.TestStressCloudBlindAtomicUpdates.test_dv_idx(TestStressCloudBlindAtomicUpdates.java:231)
[junit4] > at java.lang.Thread.run(Thread.java:748)
[...]
[junit4] 2> NOTE: test params are: codec=Asserting(Lucene70),
sim=RandomSimilarity(queryNorm=true): {}, locale=ga, timezone=Europe/Monaco
[junit4] 2> NOTE: Linux 4.13.0-41-generic i386/Oracle Corporation
1.8.0_172 (32-bit)/cpus=8,threads=1,free=238679536,total=536870912
{noformat}
> Race condition in peerSync
> --------------------------
>
> Key: SOLR-11216
> URL: https://issues.apache.org/jira/browse/SOLR-11216
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.4
> Reporter: Cao Manh Dat
> Assignee: Cao Manh Dat
> Priority: Major
> Fix For: master (8.0), 7.5
>
> Attachments: SOLR-11216.patch, SOLR-11216.patch, SOLR-11216.patch,
> SOLR-11216.patch, SOLR-11216.patch, SOLR-11216.patch, SOLR-11216.patch
>
>
> When digging into SOLR-10126. I found a case that can make peerSync fail.
> * leader and replica receive update from 1 to 4
> * replica stop
> * replica miss updates 5, 6
> * replica start recovery
> ## replica buffer updates 7, 8
> ## replica request versions from leader,
> ## in the same time leader receive update 9, so it will return updates from 1
> to 9 (for request versions) when replica get recent versions ( so it will be
> 1,2,3,4,5,6,7,8,9 )
> ## replica do peersync and request updates 5, 6, 9 from leader
> ## replica apply updates 5, 6, 9. Its index does not have update 7, 8 and
> maxVersionSpecified for fingerprint is 9, therefore compare fingerprint will
> fail
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