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https://issues.apache.org/jira/browse/SOLR-11661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16328125#comment-16328125
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Cao Manh Dat commented on SOLR-11661:
-------------------------------------
Attached a patch for reproduce the problem 100%, the case here is
- when a node get down in DELETECOLLECTION, the correspond cores in that node
is never being cleanup ( the core.properties, the index dir and tlog dir )
- after that if a core with same name and same collection get created on
different node, it will reuse the old stale tlog and index dir which leads to
many problems
> Race condition between core creation thread and recovery request from leader
> causes inconsistent view of documents
> ------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-11661
> URL: https://issues.apache.org/jira/browse/SOLR-11661
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Priority: Major
> Fix For: master (8.0), 7.3
>
> Attachments: 11458-2-MoveReplicaHDFSTest-log.txt, SOLR-11661.patch
>
>
> While testing SOLR-11458, [~ab] ran into an interesting failure which
> resulted in different document counts between leader and replica. The test is
> MoveReplicaHDFSTest on jira/solr-11458-2 branch.
> The failure is rare but reproducible on beasting:
> {code}
> reproduce with: ant test -Dtestcase=MoveReplicaHDFSTest
> -Dtests.method=testNormalFailedMove -Dtests.seed=161856CB543CD71C
> -Dtests.slow=true -Dtests.locale=ar-SA -Dtests.timezone=US/Michigan
> -Dtests.asserts=true -Dtests.file.encoding=ISO-8859-1
> [junit4] FAILURE 14.2s | MoveReplicaHDFSTest.testNormalFailedMove <<<
> [junit4] > Throwable #1: java.lang.AssertionError: expected:<100> but
> was:<56>
> [junit4] > at
> __randomizedtesting.SeedInfo.seed([161856CB543CD71C:31134983787E4905]:0)
> [junit4] > at
> org.apache.solr.cloud.MoveReplicaTest.testFailedMove(MoveReplicaTest.java:305)
> [junit4] > at
> org.apache.solr.cloud.MoveReplicaHDFSTest.testNormalFailedMove(MoveReplicaHDFSTest.java:69)
> {code}
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